570 Biowissenschaften; Biologie
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- Home range (2)
- Homeostasis (2)
- Honigbiene (2)
- HopZ1a (2)
- Hybrid speciation (2)
- Hybridisation capture (2)
- Hydrogel (2)
- Hydrogele (2)
- Hypoxie (2)
- IC (2)
- IDP (2)
- Iambic/Trochaic Law (2)
- Illumina amplicon sequencing (2)
- Illuminance (2)
- Immobilisierung (2)
- Immunoassay (2)
- InP (2)
- InPZnS (2)
- India (2)
- Individual-based modeling (2)
- Inflammation (2)
- Influenza A virus (2)
- Insect (2)
- Insulin resistance (2)
- Interdigitated electrodes (2)
- Interoception (2)
- Interspecific interactions (2)
- Introgression (2)
- Intuitive eating (2)
- Invagination (2)
- Ionentransport (2)
- Island biogeography (2)
- Isoflavone (2)
- Isolation (2)
- JUB1 (2)
- Japan (2)
- June 2013 flood (2)
- Jurkat cells (2)
- Just so stories (2)
- Kartoffel (2)
- Kernhülle (2)
- Kettle holes (2)
- Klimaänderung (2)
- Koexpression (2)
- Konnektivität (2)
- Korrelationsanalyse (2)
- Körperfett (2)
- Körperzusammensetzung (2)
- LC–MS/MS (2)
- LEA protein (2)
- LEM-domain protein (2)
- LMA (2)
- LPS (2)
- Lake (2)
- Lamin (2)
- Land use (2)
- Land-use history (2)
- Landscape (2)
- Landscape of fear (2)
- Landschaft der Angst (2)
- Large fragment deletion (2)
- Late Quaternary vegetation (2)
- Leaf senescence (2)
- Leopards (2)
- Limnology (2)
- Lipases (2)
- Lipidomics (2)
- Lysophosphatidylcholine (2)
- Lythrum salicaria (2)
- MADS-domain transcription factor (2)
- MAPK (2)
- MED16 (2)
- MHC (2)
- MSAP (2)
- Manganese (2)
- Markov cluster algorithm (2)
- Martini force-field (2)
- Mate choice (2)
- Maus (2)
- Mechanotransduction (2)
- Medicago truncatula (2)
- Meiosis (2)
- Melampyrum pratense (2)
- Membranproteine (2)
- Mesenchymal stem cells (2)
- Metabolismus (2)
- Metabolit (2)
- Metabolite (2)
- Metaboliten (2)
- Metabolites (2)
- Metabolom (2)
- Metal Metabolism (2)
- Metschnikowia (2)
- Microarrays (2)
- Microbial ecology (2)
- Microbiology (2)
- Microcystin (2)
- Microcystis aeruginosa (2)
- Microsatellite analysis (2)
- Mikroorganismen (2)
- Mikrosatelliten (2)
- Mindfulness (2)
- Mitochondrial DNA (2)
- Mitochondrien (2)
- Mitogenome (2)
- Mitogenomes (2)
- Mitose (2)
- Mitosis (2)
- Mixed mating (2)
- Mixed methods (2)
- Modell (2)
- Molekularbiologie (2)
- Molybdänkofaktor (2)
- Monoclonal antibodies (2)
- Monoclonal antibody (2)
- Monte Carlo method (2)
- Morphology (2)
- Multiplex (2)
- Multiplex mutagenesis (2)
- Muntjac (2)
- Mutation rate (2)
- Mutator locus (2)
- Mykotoxine (2)
- NAB (2)
- NE Germany (2)
- NMR spectroscopy (2)
- NMR structure (2)
- NRPS (2)
- NZO (2)
- Nahrungsnetz (2)
- Namibia (2)
- Nanostruktur (2)
- Network clustering (2)
- Netzwerke (2)
- Neurotoxicity (2)
- Nighttime illumination (2)
- Nitrat (2)
- Nitrogen deposition (2)
- Northern Asia (2)
- Norway (2)
- Nostoc punctiforme (2)
- Nucleus (2)
- NutriAct Family Study (2)
- Nutrition (2)
- O-serotyping (2)
- OMICs tools (2)
- Offspring weight (2)
- Ohrid-Prespa region (2)
- Older adults (2)
- Optogenetik (2)
- Organogenesis (2)
- Orthologous Matrix (OMA) Project (2)
- Outcrossing (2)
- Outcrossing rate (2)
- Outdoor enclosure (2)
- PBPK (2)
- PBS1 (2)
- PC-3 cells (2)
- PEI coating (2)
- PKS (2)
- PUFA (2)
- PXR (2)
- Palaeogenetics (2)
- Paläoökologie (2)
- Parasit (2)
- Parasitoid wasp (2)
- Partial Little Square (2)
- Partnership (2)
- Paternity analysis (2)
- Pathogen (2)
- Pathway design (2)
- Peptid (2)
- Periphyton (2)
- Periplaneta americana (2)
- Personality (2)
- Pex1 (2)
- Pex6 (2)
- Pflanze (2)
- Pflanzengemeinschaften (2)
- Pflanzenwachstum (2)
- Pflanzenökologie (2)
- PhIP (2)
- Phase variation (2)
- Phenole (2)
- Phosphat (2)
- Photosynthesis (2)
- Phylogenetics (2)
- Phylogenie (2)
- Phylogenomics (2)
- Pichia pastoris (2)
- Pinus sylvestris (2)
- Pipistrellus nathusii (2)
- Plankton (2)
- Plant community model (2)
- Plant development (2)
- Plant-soil feedback (2)
- Plants (2)
- Plasma membrane (2)
- Plastid (2)
- Poecilia formosa (2)
- Poecilia latipinna (2)
- Polyadenylierung (2)
- Polyelektrolyt-Multischichten (2)
- Polyethylenglykol (2)
- Polysaccharide (2)
- Population dynamics (2)
- Predator-prey interactions (2)
- Pregnancy (2)
- Priming (2)
- Promiscuous enzymes (2)
- Promotor (2)
- Prostaglandin E2 (2)
- Proteinaggregation (2)
- Proteins (2)
- Pseudomonas aeruginosa (2)
- Puumala virus seroprevalence (2)
- QDs (2)
- QTL mapping (2)
- R Shiny (2)
- RNA (2)
- RNA interference (2)
- RNA virus (2)
- RNA-guided Cas9 (2)
- RT-PCR (2)
- RUNX2 (2)
- Randomized-controlled trial (2)
- Raphidiopsis (2)
- Recombination (2)
- Redox marker (2)
- Redoxreaktion (2)
- Redoxregulation (2)
- Regulation (2)
- Rezeptor (2)
- Rhizophagus irregularis (2)
- Rice (2)
- Riesenvesikel (2)
- Rodent (2)
- Roridula gorgonias (2)
- Rotifera (2)
- RpoS (2)
- RubisCO (2)
- Russia (2)
- S-XRF (2)
- SELEX (2)
- SERS enhancement factor (2)
- SFON (2)
- SIMS techniques (2)
- SPB (2)
- SULT1A1 (2)
- SWL (2)
- Sailfin molly (2)
- Salmonella Typhimurium (2)
- Saprolegnia (2)
- Saprolegniaceae (2)
- Savannas (2)
- Savanne (2)
- Schleudertrauma (2)
- Schmalwand <Arabidopsis> (2)
- Schwefel (2)
- Scopoletin (2)
- Seasonality (2)
- Sediment (2)
- Selenium (2)
- Senescence (2)
- Sequenzierung (2)
- Sequenzierung der nächsten Generation (2)
- Serine cycle (2)
- Sexual selection (2)
- Siberian tree line (2)
- Simulation (2)
- Simulationsmodell (2)
- Smpd1 (2)
- Soil (2)
- Soil function (2)
- Solanaceae (2)
- Solanum lycopersicum (2)
- Space use (2)
- Specific wood density (2)
- Stickstoff (2)
- Strategic growth adjustment (2)
- Störung (2)
- Sulforaphan (2)
- Sulfotransferase (2)
- Sundaland (2)
- Sus scrofa (2)
- Systems Biology (2)
- Säugetiere (2)
- TAS2R (2)
- TEM (2)
- TMS (2)
- TTR (2)
- Tailspike protein (2)
- Tanzania (2)
- Tas2r (2)
- Tas2rs (2)
- Temperate forest (2)
- Tenebrio molitor larvae (2)
- Tocopherol (2)
- Toll and Imd pathways (2)
- Tomate (2)
- Tomato (2)
- Transcription factors (2)
- Transcriptional memory (2)
- Transcriptome assembly (2)
- Transporters (2)
- Tree allometry (2)
- Turkey (2)
- TusA (2)
- Type 2 Diabetes (2)
- UV radiation (2)
- Ulcerative colitis (2)
- Urbanization (2)
- Ursus arctos (2)
- V-ATPase (2)
- Venom proteins (2)
- Verhalten (2)
- Verkhoyansk mountains (2)
- Virus (2)
- Wachstum (2)
- Walker A motif (2)
- Wastewater (2)
- Weakly electric fish (2)
- Weizen (2)
- Weißstorch (2)
- Wildschwein (2)
- Wind (2)
- Wood specific gravity (2)
- Woody aboveground biomass (2)
- X-ray structure (2)
- XMRV (2)
- Xpr1 (2)
- Yap1/Wwtr1 (Taz) (2)
- Zebrafish (2)
- Zelladhäsion (2)
- Zellkern (2)
- Zellweger (2)
- Zellweger syndrome spectrum disorder (ZSSD) (2)
- Zinypr-1 (2)
- Zweizustandsmodell (2)
- Zytoskelett (2)
- aberrations (2)
- accelerometer (2)
- acclimation (2)
- acid mine drainage (2)
- acoustic communication (2)
- actin polymerization (2)
- activated carbon (2)
- activator–inhibitor models (2)
- adaptive introgression (2)
- adaptive processes (2)
- adaptive radiation (2)
- adhesion (2)
- adiponectin (2)
- age (2)
- agricultural landscape (2)
- agrin (2)
- agro-infiltration (2)
- agroecology (2)
- aldehyde oxidoreductase (2)
- alignment (2)
- alignment sensitivity / specificity (2)
- alkylierte polyzyklische aromatische Kohlenwasserstoffe (2)
- alkylphospholipids (2)
- all-cause mortality (2)
- allocation (2)
- alphaherpesvirus (2)
- alternative splicing (2)
- amino acid (2)
- amphibians (2)
- animal cognition (2)
- animal migration (2)
- anthropogenic environment (2)
- anthropogenic food subsidies (2)
- anthropometric measures (2)
- anthropometry (2)
- anti-oxidative response (2)
- antibody producing cell selection (2)
- antioxidant capacity (2)
- anxiety-like behavior (2)
- apis mellifera (2)
- apple (2)
- aquatic ecosystems (2)
- aqueous dispersion (2)
- aqueous-solution (2)
- arable land (2)
- arable weeds (2)
- arbuscular mycorrhizal symbiosis (2)
- archival DNA (2)
- area-based conservation (2)
- arsenic (2)
- arthropod (2)
- artificial light at night (ALAN) (2)
- ascorbate peroxidase (2)
- assembly (2)
- assembly processes (2)
- assembly rules (2)
- atomic force microscopy (2)
- autocorrelation (2)
- automated radio telemetry (2)
- axillary bud (2)
- baltic sea (2)
- basal body (2)
- base excision repair (incision activity) (2)
- bat fatalities (2)
- behavior (2)
- behavioral plasticity (2)
- behavioral type (2)
- behavioural syndrome (2)
- benzylic alcohol (2)
- benzylischer Alkohol (2)
- beta diversity (2)
- bias (2)
- bifurcation (2)
- bifurcation theory (2)
- biodiversity conservation (2)
- biodiversity decline (2)
- biodiversity exploratories (2)
- biodiversity facets (2)
- biofortification (2)
- biogene Amine (2)
- biological age (2)
- biological control (2)
- biological invasions (2)
- biological soil crusts (2)
- biomarker detection (2)
- biomimetic sensors (2)
- biosignatures (2)
- biostimulant (2)
- biosynthesis (2)
- biotic filtering (2)
- biotin sulfoxide reductase (2)
- bird migration (2)
- bisphosphonates (2)
- bitter (2)
- bitter taste receptors (2)
- body composition (2)
- body proportions (2)
- bone mineral density (2)
- bone pathologies (2)
- brackish waters (2)
- brain insulin signaling (2)
- branched chain amino acids (2)
- branching (2)
- breeding (2)
- buffer zones (2)
- bush encroachment (2)
- cAMP (2)
- cTBS (2)
- cadmium-free (2)
- caffeine (2)
- calcination (2)
- calcite (2)
- calcium (2)
- calcium carbonate inclusions (2)
- calcium imaging (2)
- calcium influx (2)
- canalization (2)
- cancer epidemiology (2)
- capture enrichment (2)
- carbohydrates (2)
- carbon dots (2)
- carbon isotopes (2)
- carbon labeling (2)
- cardiac development (2)
- cardiomyocyte (2)
- cardiomyogenic differentiation (2)
- carotenoid biosynthesis (2)
- carrion ecology (2)
- cascading effects (2)
- cave fish (2)
- cell adhesion (2)
- cell shape (2)
- cell signaling (2)
- cells (2)
- cellular bioenergetics (2)
- cellular bioimaging (2)
- cellulose polymeric organic matter (2)
- cerami-des (2)
- ceramides (2)
- cereal leaf beetle (2)
- cereal meals (2)
- chemostat experiments (2)
- child growth (2)
- chimeric transcription factors (2)
- chlamydomonas (2)
- chlorophyll a (2)
- chloroplast (2)
- chloroplasts (2)
- chronic diseases (2)
- chytridiomycota (2)
- cis-regulatory evolution (2)
- click chemistry (2)
- climate adaptation (2)
- climate dynamics (2)
- climate extremes (2)
- climate warming (2)
- co-expression (2)
- co-limitation (2)
- coefficient (2)
- coffee by-products (2)
- cold stress (2)
- collagen (2)
- colon carcinogenesis (2)
- colony viability (2)
- common‐garden experiment (2)
- community composition (2)
- community model (2)
- community structure (2)
- community theory (2)
- competition–defense trade‐off (2)
- comprehensive analysis (2)
- concepts (2)
- confocal microscopy (2)
- conformational change (2)
- conformational rearrangement (2)
- congeneric species (2)
- conscripts (2)
- constitutive activity (2)
- constraint-based modeling (2)
- converting factor (2)
- copper complex (2)
- copper(II) (2)
- copper-related disorders (2)
- cord blood (2)
- core shell UCNP (2)
- cori cycle (2)
- cortisol (2)
- counting (2)
- coviability analysis (2)
- crop (2)
- crop diversity (2)
- cropping system (2)
- cross-species capture (2)
- cryolithology (2)
- cryptomycota (2)
- cyanobacterial bloom (2)
- cyanobacterial sucrose-phosphatase (2)
- cytochrome c (2)
- cytoplasmic polyadenylation (2)
- cytosine methylation (2)
- cytosolic tRNA thiolation (2)
- cytotoxicity (2)
- dark virus (2)
- data integration (2)
- ddRAD (2)
- de novo genome assembly (2)
- dead Cas9 (2)
- decline (2)
- defense against predation (2)
- defensive symbiosis (2)
- degraded DNA (2)
- dehydration (2)
- demographic noise (2)
- depressive-like behavior (2)
- desiccation (2)
- design of experiment (2)
- developing brain (2)
- developmental canalization (2)
- developmental dyslexia (2)
- developmental plasticity (2)
- diacylglycerol (2)
- dietary patterns (2)
- dietary restriction (2)
- differential expression analysis (2)
- digestive enzymes quantification (2)
- dimerization of 4-nitrothiophenol (2)
- dispersal filtering (2)
- diversity profiles (2)
- dominance effect (2)
- drought stress (2)
- droughts (2)
- drug delivery (2)
- drug metabolism (2)
- drug release (2)
- dynamic equilibrium (2)
- eastern continental Asia (2)
- eavesdropping (2)
- echolocation (2)
- ecophysiology (2)
- ecosystem services provisioning (2)
- education (2)
- effectors (2)
- egg ratio (2)
- eicosapentaenoic acid (2)
- electric fish (2)
- electroencephalography (EEG) (2)
- electron microscopy (2)
- electron paramagnetic resonance (2)
- electronic tool integration (2)
- emotional imagery (2)
- emotions (2)
- endocardium (2)
- endothelial cell (2)
- endotoxin (2)
- energy expenditure (2)
- enrichment experiments (2)
- entropy (2)
- environmental DNA (2)
- environmental genomics (2)
- environmental noise (2)
- enzymology (2)
- epidemiology (2)
- epigenetic variation (2)
- epiphytes (2)
- epithionitrile (2)
- epitope prediction (2)
- epizoochory (2)
- equalizing and stabilizing mechanisms (2)
- error reduction (2)
- establishment (2)
- event coincidence analysis (2)
- evolutionary ecology (2)
- evolutionary rescue (2)
- expansion microscopy (2)
- exploitation (2)
- expression profile (2)
- extinction (2)
- extinction drivers (2)
- extra-cytoplasmic pockets (2)
- extracellular DNA (2)
- extracellular enzymes (2)
- extracellular matrix (2)
- extracellular signaling (2)
- eye-tracking (2)
- facilitation (2)
- fatty acid changes (2)
- feeding (2)
- feeding behaviour (2)
- fence interaction (2)
- fertilization (2)
- fetal origins hypothesis (2)
- fisheries (2)
- fitness gradient (2)
- fitness response (2)
- floating mat (2)
- flooded grasslands (2)
- floral scent (2)
- flow cytometry (2)
- fluorescent probe (2)
- food frequency questionnaire (2)
- food web dynamics (2)
- food webs (2)
- forage availability (2)
- forage gaps (2)
- foraging (2)
- foraging behaviour (2)
- forebrain (2)
- forest management (2)
- forestREplot (2)
- formaldehyde assimilation (2)
- formate dehydrogenase (2)
- fractionation (2)
- fractionation factors (2)
- free zinc (2)
- freshwater algae (2)
- freshwater heterotrophic bacteria (2)
- functional complementation (2)
- functional inhibitors of acid sphin-gomyelinase (2)
- functional response (2)
- functional richness (2)
- fungal diversity (2)
- fungal pathogens (2)
- funktionelle Diversität (2)
- galactolipids (2)
- gamma diversity (2)
- gas-production (2)
- gene delivery (2)
- generalized dissimilarity modelling (2)
- genetic accommodation (2)
- genetic adaptation (2)
- genetic engineering (2)
- genetic rescue (2)
- genetic screen (2)
- genetischer Screen (2)
- genome (2)
- genome scan (2)
- genomic prediction (2)
- geo-bio interaction (2)
- geographic distribution (2)
- glacial maximum (2)
- global and regional change (2)
- glucocorticoid receptor (2)
- glucose (2)
- glucosinolate hydrolysis (2)
- glutathione (2)
- glycine cleavage system (2)
- governance (2)
- grazing (2)
- gross primary production (2)
- groundwater (2)
- groundwater recharge (2)
- growth behavior (2)
- growth restriction (2)
- guard cell (2)
- gut microbiota (2)
- gwas (2)
- habitat (2)
- habitat selection (2)
- habitat use (2)
- habituation (2)
- heart regeneration (2)
- heat (2)
- heat shock protein (2)
- heliozoa (2)
- hepcidin-25 (2)
- heterocyclic aromatic amine (2)
- hilly loes plateau (2)
- histone modification (2)
- holding capability (2)
- holding isometric muscle action (HIMA) (2)
- holocene (2)
- honey bee (2)
- honey bees (2)
- hoverflies (2)
- human aldehyde oxidase (2)
- human endotoxemia (2)
- human excised skin (2)
- human introduction (2)
- human-wildlife conflict (2)
- hydrogels (2)
- hyena (2)
- hyperoxia (2)
- hypertension (2)
- hyperthermia (2)
- immunoassay (2)
- immunogenicity (2)
- importin (2)
- in silico (2)
- in vitro intestinal model (2)
- in-vitro-synthesis (2)
- inbreeding depression (2)
- indirect facilitation (2)
- individual based modeling (2)
- individual-based modeling (2)
- infancy (2)
- infiltration (2)
- inhibition (2)
- inner-mongolia (2)
- integrated assessments (2)
- inter-brain synchronization (2)
- inter-muscle-brain synchronization (2)
- interpersonal muscle action (2)
- interspecific interactions (2)
- intestinal mucins (2)
- intestinal zinc resorption (2)
- intra-organ-communication (2)
- intraguild predation (2)
- intraspecific variation (2)
- invasibility (2)
- invasion success (2)
- invasive species (2)
- ion channel (2)
- ion mobility spectrometry (2)
- ion transport (2)
- ion-exchange chromatography (2)
- ionic liquid (2)
- ionic strength (2)
- ionogel (2)
- iron-sulfur clusters (2)
- island biogeography (2)
- island disharmony (2)
- island syndromes (2)
- islands (2)
- isomerization (2)
- jasmonate (2)
- kelp (2)
- l-cysteine desulfurase (2)
- lake monitoring (2)
- lake periphyton (2)
- land sharing vs. land sparing (2)
- land use change (2)
- land-use change (2)
- landscape diversity (2)
- landscape generator (2)
- landscape homogenization (2)
- late pleistocene (2)
- later health (2)
- lichens (2)
- life cycle (2)
- life‐history traits (2)
- ligand exchange (2)
- light adaptation (2)
- light variability (2)
- limits (2)
- lipid classes (2)
- lipid limitation thresholds (2)
- lipid membranes (2)
- lipid–lipid interactions (2)
- lipoplexes (2)
- loci (2)
- lokale Anpassung (2)
- longitudinal (2)
- low-energy electrons (2)
- luminescence (2)
- lysosomal hydrolases (2)
- lysosomal storage disorders (2)
- lysosome (2)
- mRNA degradation (2)
- magnitude estimation (2)
- maintenance (2)
- maintenance of functional diversity (2)
- maintenance of genomic integrity (2)
- major histocompatibility complex (2)
- male Daphnia (2)
- maltooligosaccharides (2)
- mammalian-cells (2)
- manganese (2)
- manual muscle test (2)
- many-to-one genotype–phenotype map (2)
- mapping (2)
- mass conservation (2)
- mass index (2)
- mate-pairs (2)
- mathematical modelling (2)
- mathematical precursor (2)
- maturation (2)
- meal timing (2)
- mechanical (2)
- mechanical strength (2)
- mechanisms (2)
- mechanomyography (MMG) (2)
- mediated delivery (2)
- membrane biophysics (2)
- membrane fusion (2)
- membrane microdomains (2)
- membrane protein (2)
- membrane stabilization (2)
- memory (2)
- mercaptocarboxylic acids (2)
- mesenchymal stem cells (2)
- mesophyll cell (2)
- messenger-rna polyadenylation (2)
- meta-analysis (2)
- metabolic syndrome (2)
- metabolic-profiling (2)
- metabolische Netzwerke (2)
- metabolite (2)
- metagenome (2)
- metagenomic analysis (2)
- metagenomics 2.0 (2)
- metal complex (2)
- metal peptide (2)
- metallopeptide (2)
- metalloprotein (2)
- methane oxidation (2)
- methylotrophy (2)
- miRNAs (2)
- microarrays (2)
- microbial activity (2)
- microbial communities (2)
- microbiome (2)
- microbiota (2)
- microclimate (2)
- microcomputed tomography (2)
- microeukaryotes (2)
- microfluidics (2)
- microstructure (2)
- microtubule-organization (2)
- mitochondrial genome (mtDNA) (2)
- mitogenomes (2)
- mixed cultures (2)
- model (2)
- model integration (2)
- model limitations (2)
- models (2)
- modern coexistence theory (2)
- mojave desert (2)
- molecular biology (2)
- molecular dynamics simulations (2)
- molecular evolution (2)
- molecular species identification (2)
- molybdoenzyme (2)
- molybdopterin synthase (2)
- morphology (2)
- movement speed (2)
- mucus layer (2)
- multidrug resistance (2)
- multiple sclerosis (2)
- multishell (2)
- multivalence (2)
- multi‐ year flooding cycle (2)
- muscle (2)
- musicality (2)
- mutation (2)
- mutual information (2)
- mycotoxins (2)
- myocardial infarction (2)
- myocardium (2)
- myoglobin (2)
- n-alkanes (2)
- n-oxide reductase (2)
- nachhaltige Landnutzung (2)
- nanoelectrodes (2)
- nanogels (2)
- nanostructure (2)
- native American ancestry (2)
- necrobiome (2)
- neophilia (2)
- neophobia (2)
- net primary productivity (2)
- network analysis (2)
- network reconstruction (2)
- neurodegeneration (2)
- neurodegenerative diseases (2)
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Urbanization promotes specific bacteria in freshwater microbiomes including potential pathogens
(2022)
Freshwater ecosystems are characterized by complex and highly dynamic microbial communities that are strongly structured by their local environment and biota. Accelerating urbanization and growing city populations detrimentally alter freshwater environments. To determine differences in freshwater microbial communities associated with urban-ization, full-length 16S rRNA gene PacBio sequencing was performed in a case study from surface waters and sedi-ments from a wastewater treatment plant, urban and rural lakes in the Berlin-Brandenburg region, Northeast Germany. Water samples exhibited highly habitat specific bacterial communities with multiple genera showing clear urban signatures. We identified potentially harmful bacterial groups associated with environmental parameters specific to urban habitats such as Alistipes, Escherichia/Shigella, Rickettsia and Streptococcus. We demonstrate that urban-ization alters natural microbial communities in lakes and, via simultaneous warming and eutrophication and creates favourable conditions that promote specific bacterial genera including potential pathogens. Our findings are evidence to suggest an increased potential for long-term health risk in urbanized waterbodies, at a time of rapidly expanding global urbanization. The results highlight the urgency for undertaking mitigation measures such as targeted lake restoration projects and sustainable water management efforts.
Der Fettsäurestoffwechsel unterliegt vielfältigen Kontrollmechanismen. So wird der Fettsäureabbau über die Induktion und Aktivität spezifischer Enzyme reguliert. Ein zentraler Regulator ist dabei der nukleäre Rezeptor Peroxisomenproliferator-aktivierter-Rezeptor-α (PPARα). PPARα wird durch freie Fettsäuren in der Zelle aktiviert und fördert über die Induktion von Zielgenen den Fettsäuretransport und -abbau sowie die Gluconeogenese und Ketogenese. Der Anstieg an freien Fettsäuren beim Fasten, aber auch im Diabetes aktiviert PPARα. Unabhängig davon wurde in beiden Stoffwechsellagen auch eine erhöhte Expression des nukleären Rezeptors Constitutiver-Androstan-Rezeptor (CAR) und einiger CAR-Zielgene, vorrangig Enzyme des Fremdstoffmetabolismus wie Cytochrom P450 2B (CYP2B), festgestellt. Bei der Adaption an eine Fastensituation scheinen PPARα- und CAR-Signalwege über einen bisher unbekannten Mechanismus miteinander verschaltet zu sein. In der vorliegenden Arbeit sollte der der Verschaltung zugrunde liegende Mechanismus anhand eines Modelsystems, der PPARα-Agonisten-vermittelten Verstärkung der Phenobarbital (PB)-abhängigen Induktion des CAR-Zielgens CYP2B, in vitro untersucht werden. Zudem sollte die physiologische Relevanz einer durch PPARα-Agonisten vermittelten Modulierung der CYP2B-Aktivität in einer Ganztierstudie in vivo belegt werden. Die verwendeten synthetischen PPARα-Agonisten steigerten in primären Hepatozyten der Ratte signifikant die Phenobarbital (PB)-abhängige mRNA- und Protein-Expression sowie die Aktivität von CYP2B. Ohne vorherige PB-Behandlung induzierten PPARα-Agonisten CYP2B nicht. In Gegenwart von PB war die Steigerung der CYP2B-Aktivität durch PPARα-Agonisten dosisabhängig. In einem Luciferase-Reportergenassay wurde gezeigt, dass die Induktion durch PB unter der Kontrolle des CYP2B1-Promotors von einem distalen PBREM (PB-responsive-enhancer-module), an welches CAR binden kann, abhängig war. PPARα-Agonisten steigerten diese PB- und PBREM-abhängige Reportergentranskription und induzierten die CAR-mRNA und CAR-Proteinexpression. Sie aktivierten die Transkription eines Reportergens unter der Kontrolle eines Promotorfragments von bis zu 4,4 kb oberhalb des mutmaßlichen CAR-Transkriptionsstarts. Mit Hilfe von Deletionskonstrukten konnte ein potentielles Peroxisomenproliferator-aktivierter-Rezeptor-responsives Element (PPRE) im CAR-Promotorbereich von -942 bp bis -930 bp identifiziert werden, welches essentiell für die Initiation der Transkription durch PPARα-Agonisten ist. In band shift Experimenten akkumulierte verstärkt Kernprotein mit diesem PPRE. Ein Überschuss an unmarkiertem Wildtyp-CAR-Reportergenvektor, nicht aber an CAR-Reportergenvektor mit PPRE-Deletion, konnte mit dem markierten PPRE um die Bindung von Kernprotein konkurrieren. Nach Chromatin-Immunpräzipitation mit einem PPARα-Antikörper wiederum wurde das betreffende PPRE amplifiziert. Bei in vivo Experimenten an männlichen Ratten resultierte die Behandlung mit PPARα-Agonisten in einer signifikanten Induktion der CAR-mRNA-Expression und signifikant erhöhter PB-abhängiger CYP2B-Aktivität. Die physiologisch Relevanz wurde durch weiterführenden Experimente unterstrichen, in denen gezeigt wurde, dass die Fasten-abhängige Induktion von CAR in PPARα-defizienten Mäusen unterdrückt war. Diese Experimente legen nahe, dass durch PPARα-Agonisten aktiviertes PPARα an das PPRE im CAR-Promotorbereich von -942 bp bis -930 bp bindet und dadurch die CAR-Transkription induziert. Somit kann CAR als PPARα-Zielgen betrachtet werden, was die Schlussfolgerung zulässt, dass die PPARα- und CAR-Signalwege über die direkte Bindung von PPARα an den CAR-Promotor unmittelbar miteinander verknüpft sind. Allerdings ist davon unabhängig eine Aktivierung von CAR, etwa durch PB, für die vermehrte Induktion von CAR-Zielgenen notwendig . Die physiologische Relevanz der PPARα-abhängige CAR-Expression zeigt sich in den Ganztierexperimenten, bei denen die Wirksamkeit der PPARα-Agonisten bestätigt werden konnte. CAR-abhängig induzierte Enzyme sind nicht nur in großem Umfang am Fremdstoffmetabolismus beteiligt, sondern auch am Abbau von Schilddrüsenhormonen und Glucocorticoiden. Sie können damit direkt Einfluss auf den Kohlenhydrat- und Energiestoffwechsel sowie die Regulation der Nahrungsaufnahme nehmen. Über eine PPARα-abhängige Induktion von CAR im Rahmen der Fastenadaption könnten die CAR-Zielgene UDP-Glucuronyltransferase 1A1 und Sulfotransferase N beispielsweise verstärkt Schilddrüsenhormone abbauen und in der Folge den Grundumsatz senken. Der in dieser Arbeit erstmals beschriebene Mechanismus ist dafür von zentraler Bedeutung.
Using ESTs for phylogenomics
(2008)
Background
While full genome sequences are still only available for a handful of taxa, large collections of partial gene sequences are available for many more. The alignment of partial gene sequences results in a multiple sequence alignment containing large gaps that are arranged in a staggered pattern. The consequences of this pattern of missing data on the accuracy of phylogenetic analysis are not well understood. We conducted a simulation study to determine the accuracy of phylogenetic trees obtained from gappy alignments using three commonly used phylogenetic reconstruction methods (Neighbor Joining, Maximum Parsimony, and Maximum Likelihood) and studied ways to improve the accuracy of trees obtained from such datasets.
Results
We found that the pattern of gappiness in multiple sequence alignments derived from partial gene sequences substantially compromised phylogenetic accuracy even in the absence of alignment error. The decline in accuracy was beyond what would be expected based on the amount of missing data. The decline was particularly dramatic for Neighbor Joining and Maximum Parsimony, where the majority of gappy alignments contained 25% to 40% incorrect quartets. To improve the accuracy of the trees obtained from a gappy multiple sequence alignment, we examined two approaches. In the first approach, alignment masking, potentially problematic columns and input sequences are excluded from from the dataset. Even in the absence of alignment error, masking improved phylogenetic accuracy up to 100-fold. However, masking retained, on average, only 83% of the input sequences. In the second approach, alignment subdivision, the missing data is statistically modelled in order to retain as many sequences as possible in the phylogenetic analysis. Subdivision resulted in more modest improvements to alignment accuracy, but succeeded in including almost all of the input sequences.
Conclusion
These results demonstrate that partial gene sequences and gappy multiple sequence alignments can pose a major problem for phylogenetic analysis. The concern will be greatest for high-throughput phylogenomic analyses, in which Neighbor Joining is often the preferred method due to its computational efficiency. Both approaches can be used to increase the accuracy of phylogenetic inference from a gappy alignment. The choice between the two approaches will depend upon how robust the application is to the loss of sequences from the input set, with alignment masking generally giving a much greater improvement in accuracy but at the cost of discarding a larger number of the input sequences.
Using individual-based modeling to understand grassland diversity and resilience in the Anthropocene
(2020)
The world’s grassland systems are increasingly threatened by anthropogenic change. Susceptible to a variety of different stressors, from land-use intensification to climate change, understanding the mechanisms driving the maintenance of these systems’ biodiversity and stability, and how these mechanisms may shift under human-mediated disturbance, is thus critical for successfully navigating the next century. Within this dissertation, I use an individual-based and spatially-explicit model of grassland community assembly (IBC-grass) to examine several processes, thought key to understanding their biodiversity and stability and how it changes under stress. In the first chapter of my thesis, I examine the conditions under which intraspecific trait variation influences the diversity of simulated grassland communities. In the second and third chapters of my thesis, I shift focus towards understanding how belowground herbivores influence the stability of these grassland systems to either a disturbance that results in increased, stochastic, plant mortality, or eutrophication.
Intraspecific trait variation (ITV), or variation in trait values between individuals of the same species, is fundamental to the structure of ecological communities. However, because it has historically been difficult to incorporate into theoretical and statistical models, it has remained largely overlooked in community-level analyses. This reality is quickly shifting, however, as a consensus of research suggests that it may compose a sizeable proportion of the total variation within an ecological community and that it may play a critical role in determining if species coexist. Despite this increasing awareness that ITV matters, there is little consensus of the magnitude and direction of its influence. Therefore, to better understand how ITV changes the assembly of grassland communities, in the first chapter of my thesis, I incorporate it into an established, individual-based grassland community model, simulating both pairwise invasion experiments as well as the assembly of communities with varying initial diversities. By varying the amount of ITV in these species’ functional traits, I examine the magnitude and direction of ITV’s influence on pairwise invasibility and community coexistence. During pairwise invasion, ITV enables the weakest species to more frequently invade the competitively superior species, however, this influence does not generally scale to the community level. Indeed, unless the community has low alpha- and beta- diversity, there will be little effect of ITV in bolstering diversity. In these situations, since the trait axis is sparsely filled, the competitively inferior may suffer less competition and therefore ITV may buffer the persistence and abundance of these species for some time.
In the second and third chapters of my thesis, I model how one of the most ubiquitous trophic interactions within grasslands, herbivory belowground, influences their diversity and stability. Until recently, the fundamental difficulty in studying a process within the soil has left belowground herbivory “out of sight, out of mind.” This dilemma presents an opportunity for simulation models to explore how this understudied process may alter community dynamics. In the second chapter of my thesis, I implement belowground herbivory – represented by the weekly removal of plant biomass – into IBC-grass. Then, by introducing a pulse disturbance, modelled as the stochastic mortality of some percentage of the plant community, I observe how the presence of belowground herbivores influences the resistance and recovery of Shannon diversity in these communities. I find that high resource, low diversity, communities are significantly more destabilized by the presence of belowground herbivores after disturbance. Depending on the timing of the disturbance and whether the grassland’s seed bank persists for more than one season, the impact of the disturbance – and subsequently the influence of the herbivores – can be greatly reduced. However, because human-mediated eutrophication increases the amount of resources in the soil, thus pressuring grassland systems, our results suggest that the influence of these herbivores may become more important over time.
In the third chapter of my thesis, I delve further into understanding the mechanistic underpinnings of belowground herbivores on the diversity of grasslands by replicating an empirical mesocosm experiment that crosses the presence of herbivores above- and below-ground with eutrophication. I show that while aboveground herbivory, as predicted by theory and frequently observed in experiments, mitigates the impact of eutrophication on species diversity, belowground herbivores counterintuitively reduce biodiversity. Indeed, this influence positively interacts with the eutrophication process, amplifying its negative impact on diversity. I discovered the mechanism underlying this surprising pattern to be that, as the herbivores consume roots, they increase the proportion of root resources to root biomass. Because root competition is often symmetric, herbivory fails to mitigate any asymmetries in the plants’ competitive dynamics. However, since the remaining roots have more abundant access to resources, the plants’ competition shifts aboveground, towards asymmetric competition for light. This leads the community towards a low-diversity state, composed of mostly high-performance, large plant species. We further argue that this pattern will emerge unless the plants’ root competition is asymmetric, in which case, like its counterpart aboveground, belowground herbivory may buffer diversity by reducing this asymmetry between the competitively superior and inferior plants.
I conclude my dissertation by discussing the implications of my research on the state of the art in intraspecific trait variation and belowground herbivory, with emphasis on the necessity of more diverse theory development in the study of these fundamental interactions. My results suggest that the influence of these processes on the biodiversity and stability of grassland systems is underappreciated and multidimensional, and must be thoroughly explored if researchers wish to predict how the world’s grasslands will respond to anthropogenic change. Further, should researchers myopically focus on understanding central ecological interactions through only mathematically tractable analyses, they may miss entire suites of potential coexistence mechanisms that can increase the coviability of species, potentially leading to coexistence over ecologically-significant timespans. Individual-based modelling, therefore, with its focus on individual interactions, will prove a critical tool in the coming decades for understanding how local interactions scale to larger contexts, and how these interactions shape ecological communities and further predicting how these systems will change under human-mediated stress.
The activity of vacuolar H+-ATPase (V-ATPase) in the apical membrane of blowfly (Calliphora vicina) salivary glands is regulated by the neurohormone serotonin (5-HT). 5-HT induces, via protein kinase A, the phosphorylation of V-ATPase subunit C and the assembly of V-ATPase holoenzymes. The protein phosphatase responsible for the dephosphorylation of subunit C and V-ATPase inactivation is not as yet known. We show here that inhibitors of protein phosphatases PP1 and PP2A (tautomycin, ocadaic acid) and PP2B (cyclosporin A, FK-506) do not prevent V-ATPase deactivation and dephosphorylation of subunit C. A decrease in the intracellular Mg2+ level caused by loading secretory cells with EDTA-AM leads to the activation of proton pumping in the absence of 5-HT, prolongs the 5-HT-induced response in proton pumping, and inhibits the dephosphorylation of subunit C. Thus, the deactivation of V-ATPase is most probably mediated by a protein phosphatase that is insensitive to okadaic acid and that requires Mg2+, namely, a member of the PP2C protein family. By molecular biological techniques, we demonstrate the expression of at least two PP2C protein family members in blowfly salivary glands. © 2009 Wiley Periodicals, Inc.
Vacuole integrity maintained by DUF300 proteins is required for brassinosteroid signaling regulation
(2018)
Brassinosteroid (BR) hormone signaling controls multiple processes during plant growth and development and is initiated at the plasma membrane through the receptor kinase BRASSINOSTEROID INSENSITIVE1 (BRI1) together with co-receptors such as BRI1-ASSOCIATED RECEPTOR KINASE1 (BAK1). BRI1 abundance is regulated by endosomal recycling and vacuolar targeting, but the role of vacuole-related proteins in BR receptor dynamics and BR responses remains elusive. Here, we show that the absence of two DUF300 domain-containing tonoplast proteins, LAZARUS1 (LAZ1) and LAZ1 HOMOLOG1 (LAZ1H1), causes vacuole morphology defects, growth inhibition, and constitutive activation of BR signaling. Intriguingly, tonoplast accumulation of BAK1 was substantially increased and appeared causally linked to enhanced BRI1 trafficking and degradation in laz1 laz1h1 plants. Since unrelated vacuole mutants exhibited normal BR responses, our findings indicate that DUF300 proteins play distinct roles in the regulation of BR signaling by maintaining vacuole integrity required to balance subcellular BAK1 pools and BR receptor distribution.
In order to improve a recently established cell-based assay to assess the potency of botulinum neurotoxin, neuroblastoma-derived SiMa cells and induced pluripotent stem-cells (iPSC) were modified to incorporate the coding sequence of a reporter luciferase into a genetic safe harbor utilizing CRISPR/Cas9. A novel method, the double-control quantitative copy number PCR (dc-qcnPCR), was developed to detect off-target integrations of donor DNA. The donor DNA insertion success rate and targeted insertion success rate were analyzed in clones of each cell type. The dc-qcnPCR reliably quantified the copy number in both cell lines. The probability of incorrect donor DNA integration was significantly increased in SiMa cells in comparison to the iPSCs. This can possibly be explained by the lower bundled relative gene expression of a number of double-strand repair genes (BRCA1, DNA2, EXO1, MCPH1, MRE11, and RAD51) in SiMa clones than in iPSC clones. The dc-qcnPCR offers an efficient and cost-effective method to detect off-target CRISPR/Cas9-induced donor DNA integrations.
Puumala virus (PUUV) causes many human infections in large parts of Europe and can lead to mild to moderate disease. The bank vole (Myodes glareolus) is the only reservoir of PUUV in Central Europe. A commercial PUUV rapid field test for rodents was validated for bank-vole blood samples collected in two PUUV-endemic regions in Germany (North Rhine-Westphalia and Baden-Wurttemberg). A comparison of the results of the rapid field test and standard ELISAs indicated a test efficacy of 93-95%, largely independent of the origin of the antigens used in the ELISA. In ELISAs, reactivity for the German PUUV strain was higher compared to the Swedish strain but not compared to the Finnish strain, which was used for the rapid field test. In conclusion, the use of the rapid field test can facilitate short-term estimation of PUUV seroprevalence in bank-vole populations in Germany and can aid in assessing human PUUV infection risk.
Der Buchfinkengesang wurde in Potsdam in zwei Hauptpopulationen über drei Jahre aufgenommen. Jedes Individuum wurde eindeutig am individuellen Strophentypenrepertoire identifiziert. Ein weiterer Punkt der die individuelle Wiedererkennung bestätigt ist die hohe Standorttreue der adulten Männchen. Die beschriebene Methode eignet sich für die Untersuchung von gesamten Populationen, um den Wandel des Gesangs von Populationen in Raum und Zeit zu beschreiben. Die Haupterkenntnisse der Arbeit sind: - Die Gesamtanzahl der Grundstrophentypen innerhalb einer Population bleibt über Jahre konstant. - Die relative Häufigkeit jedes einzelnen Strophentyps variiert von Jahr zu Jahr und von Population zu Population. - Gesangslernen erfolgt exakt mit einem Korrektheitsgrad von mindestens 96%. - Das Song-Sharing ist innerhalb der Population hoch. Die diskutierten Mechanismen für das Song-Sharing sind: Die Lebenserwartung, das Zugverhalten, das Lernverhalten, die Etabliertheit von Strophentypen, Weibchenpräferenzen und die Reaktionen der territorialen Männchen. - Weiterhin wurde ein Modell zur kulturellen Evolution des Buchfinkengesangs programmiert, um die Rolle der Einflussfaktoren, wie Fehlerquote, Abwanderungsrate und Laufzeit zu ermitteln. Der Wandel des Dialektes erfolgt graduell in Raum und Zeit. Daher sind keine scharfen Dialektgrenzen anzutreffen. Trotz dieser Tatsache markieren die etablierten Strophentypen die Population. 50 % der Juvenilen siedeln am Geburtsort, auf diese Weise bleibt der Dialekt erhalten und Inzest wird vermieden. -Analysiert man das Repertoire benachbarten Männchen bei isolierten Alleen, so entspricht die Gesangsangleichung in etwa dem Zufall. -Intraindividuelle Vergleiche der quantitativen Parameter des jeweiligen Strophentyps wurden saisonal und annuell durchgeführt. Saisonal konnten für einen Strophentyp ein Trend ermittelt werden. Bei jährlichen Vergleichen konnten intraindividuell ausschließlich nicht signifikante Ergebnisse ermittelt werden, wohingegen die interindividuelle Variation in zwei Fällen signifikant war. In einem Fall bestand ein Trend und in einem weiteren Fall war die Variationsunterschiede nicht signifikant. - Der Verlauf der Brutsaison lässt sich an der jährlichen Gesangsaktivität nachvollziehen.
Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.
Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.
Genetic divergence and the frequency of hybridization are central for defining species delimitations, especially among cryptic species where morphological differences are merely absent. Rotifers are known for their high cryptic diversity and therefore are ideal model organisms to investigate such patterns. Here, we used the recently resolved Brachionus calyciflorus species complex to investigate whether previously observed between species differences in thermotolerance and gene expression are also reflected in their genomic footprint. We identified a Heat Shock Protein gene (HSP 40 kDa) which exhibits cross species pronounced sequence variation. This gene exhibits species-specific fixed sites, alleles, and sites putatively under positive selection. These sites are located in protein binding regions involved in chaperoning and may therefore reflect adaptive diversification. By comparing three genetic markers (ITS, COI, HSP 40 kDa), we revealed hybridization events between the cryptic species. The low frequency of introgressive haplotypes/alleles suggest a tight, but not fully impermeable boundary between the cryptic species.
Resource distribution heterogeneity offers niche opportunities for species with different functional traits to develop and potentially coexist. Available light (photosynthetically active radiation or PAR) for suspended algae (phytoplankton) may fluctuate greatly over time and space. Species-specific light acquisition traits capture important aspects of the ecophysiology of phytoplankton and characterize species growth at either limiting or saturating daily PAR supply. Efforts have been made to explain phytoplankton coexistence using species-specific light acquisition traits under constant light conditions, but not under fluctuating light regimes that should facilitate non-equilibrium coexistence. In the well-mixed, hypertrophic Lake TaiHu (China), we incubated the phytoplankton community in bottles placed either at fixed depths or moved vertically through the water column to mimic vertical mixing. Incubations at constant depths received only the diurnal changes in light, while the moving bottles received rapidly fluctuating light. Species-specific light acquisition traits of dominant cyanobacteria (Anabaena flos-aquae, Microcystis spp.) and diatom (Aulacoseira granulata, Cyclotella pseudostelligera) species were characterized from their growth-light relationships that could explain relative biomasses along the daily PAR gradient under both constant and fluctuating light. Our study demonstrates the importance of interspecific differences in affinities to limiting and saturating light for the coexistence of phytoplankton species in spatially heterogeneous light conditions. Furthermore, we observed strong intraspecific differences in light acquisition traits between incubation under constant and fluctuating light - leading to the reversal of light utilization strategies of species. This increased the niche space for acclimated species, precluding competitive exclusion. These observations could enhance our understanding of the mechanisms behind the Paradox of the Plankton.
Understanding the molecular basis of morphological change remains a central challenge in evolutionary-developmental biology. The transition from outbreeding to selfing is often associated with a dramatic reduction in reproductive structures and functions, such as the loss of attractive pheromones in hermaphroditic Caenorhabditis elegans and a reduced flower size in plants. Here, we demonstrate that variation in the level of the brassinosteroid-biosynthesis enzyme CYP724A1 contributes to the reduced flower size of selfing Capsella rubella compared with its outbreeding ancestor Capsella grandiflora. The primary transcript of the C. rubella allele is spliced more efficiently than that of C. grandiflora, resulting in higher brassinosteroid levels. These restrict organ growth by limiting cell proliferation. More efficient splicing of the C. rubella allele results from two de novo mutations in the selfing lineage. Thus, our results highlight the potentially widespread importance of differential splicing efficiency and higher-than-optimal hormone levels in generating phenotypic variation.
The nature of the interaction between prehistoric humans and their environment, especially the vegetation, has long been of interest. The Qinghai Lake Basin in North China is well-suited to exploring the interactions between prehistoric humans and vegetation in the Tibetan Plateau, because of the comparatively dense distribution of archaeological sites and the ecologically fragile environment. Previous pollen studies of Qinghai Lake have enabled a detailed reconstruction of the regional vegetation, but they have provided relatively little information on vegetation change within the Qinghai Lake watershed. To address the issue we conducted a pollen-based vegetation reconstruction for an archaeological site (YWY), located on the southern shore of Qinghai Lake. We used high temporal-resolution pollen records from the YWY site and from Qinghai Lake, spanning the interval since the last deglaciation (15.3 kyr BP to the present) to quantitatively reconstruct changes in the local and regional vegetation using Landscape Reconstruction Algorithm models. The results show that, since the late glacial, spruce forest grew at high altitudes in the surrounding mountains, while the lakeshore environment was occupied mainly by shrub-steppe. From the lateglacial to the middle Holocene, coniferous woodland began to expand downslope and reached the YWY site at 7.1 kyr BP. The living environment of the local small groups of Paleolithic-Epipaleolithic humans (during 15.3-13.1 kyr BP and 9-6.4 kyr BP) changed from shrub-steppe to coniferous forest-steppe. The pollen record shows no evidence of pronounced changes in the vegetation community corresponding to human activity. However, based on a comparison of the local and regional vegetation reconstructions, low values of biodiversity and a significant increase in two indicators of vegetation degradation, Chenopodiaceae and Rosaceae, suggest that prehistoric hunters-gatherers likely disturbed the local vegetation during 9.0-6.4 kyr BP. Our findings are a preliminary attempt to study human-environment interactions at Paleolithic-Epipaleolithic sites in the region, and they contribute to ongoing environmental archaeology research in the Tibetan Plateau.
Relationships between climate, species composition, and species richness are of particular importance for understanding how boreal ecosystems will respond to ongoing climate change. This study aims to reconstruct changes in terrestrial vegetation composition and taxa richness during the glacial Late Pleistocene and the interglacial Holocene in the sparsely studied southeastern Yakutia (Siberia) by using pollen and sedimentary ancient DNA (sedaDNA) records. Pollen and sedaDNA metabarcoding data using the trnL g and h markers were obtained from a sediment core from Lake Bolshoe Toko. Both proxies were used to reconstruct the vegetation composition, while metabarcoding data were also used to investigate changes in plant taxa richness. The combination of pollen and sedaDNA approaches allows a robust estimation of regional and local past terrestrial vegetation composition around Bolshoe Toko during the last similar to 35,000 years. Both proxies suggest that during the Late Pleistocene, southeastern Siberia was covered by open steppe-tundra dominated by graminoids and forbs with patches of shrubs, confirming that steppe-tundra extended far south in Siberia. Both proxies show disturbance at the transition between the Late Pleistocene and the Holocene suggesting a period with scarce vegetation, changes in the hydrochemical conditions in the lake, and in sedimentation rates. Both proxies document drastic changes in vegetation composition in the early Holocene with an increased number of trees and shrubs and the appearance of new tree taxa in the lake's vicinity. The sedaDNA method suggests that the Late Pleistocene steppe-tundra vegetation supported a higher number of terrestrial plant taxa than the forested Holocene. This could be explained, for example, by the "keystone herbivore" hypothesis, which suggests that Late Pleistocene megaherbivores were able to maintain a high plant diversity. This is discussed in the light of the data with the broadly accepted species-area hypothesis as steppe-tundra covered such an extensive area during the Late Pleistocene.
Ecological niche models (ENMs) are often used to investigate how climatic variables from known occurrence records can estimate potential species range distribution. Although climate-based ENMs provide critical baseline information, the inclusion of non-climatic predictors related to vegetation cover might generate more realistic scenarios. This assumption is particularly relevant for species with life-history traits related to forest habitats and sensitive to habitat loss and fragmentation. Here, we developed ENMs for 36 Atlantic Forest endemic birds considering two sets of predictor variables: (i) climatic variables only and (ii) climatic variables combined with the percentage of remaining native vegetation. We hypothesized that the inclusion of native vegetation data would decrease the potential range distribution of forest-dependent species by limiting their occurrence in regions harboring small areas of native vegetation habitats, despite otherwise favorable climatic conditions. We also expected that habitat restriction in the climate-vegetation models would be more pronounced for highly forest-dependent birds. The inclusion of vegetation data in the modeling procedures restricted the final distribution ranges of 22 out of 36 modeled species, while the 14 remaining presented an expansion of their ranges. We observed that species with high and medium forest dependency showed higher restriction in range size predictions between predictor sets than species with low forest dependency, which showed no alteration or range expansion. Overall, our results suggest that ENMs based on climatic and landscape variables may be a useful tool for conservationists to better understand the dynamic of bird species distributions in threatened and highly fragmented regions such as the Atlantic Forest hotspot.(c) 2021 Associacao Brasileira de Cie circumflex accent ncia Ecol ogica e Conservacao. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ ).
Shrub encroachment has far-reaching ecological and economic consequences in many ecosystems worldwide. Yet, compositional changes associated with shrub encroachment are often overlooked despite having important effects on ecosystem functioning. We document the compositional change and potential drivers for a northern Namibian Combretum woodland transitioning into a Terminalia shrubland. We use a multiproxy record (pollen, sedimentary ancient DNA, biomarkers, compound-specific carbon (delta C-13) and deuterium (delta D) isotopes, bulk carbon isotopes (delta(13)Corg), grain size, geochemical properties) from Lake Otjikoto at high taxonomical and temporal resolution. We provide evidence that state changes in semiarid environments may occur on a scale of one century and that transitions between stable states can span around 80 years and are characterized by a unique vegetation composition. We demonstrate that the current grass/woody ratio is exceptional for the last 170 years, as supported by n-alkane distributions and the delta C-13 and delta(13)Corg records. Comparing vegetation records to environmental proxy data and census data, we infer a complex network of global and local drivers of vegetation change. While our delta D record suggests physiological adaptations of woody species to higher atmospheric pCO(2) concentration and drought, our vegetation records reflect the impact of broad-scale logging for the mining industry, and the macrocharcoal record suggests a decrease in fire activity associated with the intensification of farming. Impact of selective grazing is reflected by changes in abundance and taxonomical composition of grasses and by an increase of nonpalatable and trampling-resistant taxa. In addition, grain-size and spore records suggest changes in the erodibility of soils because of reduced grass cover. Synthesis. We conclude that transitions to an encroached savanna state are supported by gradual environmental changes induced by management strategies, which affected the resilience of savanna ecosystems. In addition, feedback mechanisms that reflect the interplay between management legacies and climate change maintain the encroached state.
Vergleich von rekombinanten Vaccinia- und DNA-Vektoren zur Tumorimmuntherapie im C57BL/6-Mausmodell
(2002)
In der vorliegenden Arbeit wurden Tumorimpfstoffe auf der Basis des Plasmid-Vektors pCI, modified vaccinia virus Ankara (MVA) und MVA-infizierten dendritischen Zellen entwickelt und durch Sequenzierung, Western blotting und durchflußzytometrische Analyse überprüft. Die in vivo Wirksamkeit der Vakzinen wurde in verschiedenen Tumormodellen in C57BL/6 Mäusen verglichen. Die auf dem eukaryotischen Expressionsvektor pCI basierende DNA-Vakzinierung induzierte einen sehr wirksamen, antigenspezifischen und langfristigen Schutz vor Muzin, CEA oder beta-Galactosidase exprimierenden Tumoren. Eine MVA-Vakzinierung bietet in den in dieser Arbeit durchgeführten Tumormodellen keinen signifikanten Schutz vor Muzin oder beta-Galactosidase exprimierenden Tumoren. Sowohl humane, als auch murine in vitro generierte dendritische Zellen lassen sich mit MVA – im Vergleich zu anderen viralen Vektoren – sehr gut infizieren. Die Expressionsrate der eingefügten Gene ist aber gering im Vergleich zur Expression in permissiven Wirtszellen des Virus (embryonale Hühnerfibroblasten). Es konnte gezeigt werden, daß eine MVA-Infektion dendritischer Zellen ähnliche Auswirkungen auf den Reifezustand humaner und muriner dendritischer Zellen hat, wie eine Infektion mit replikationskompetenten Vakzinia-Stämmen, und außerdem die Hochregulation von CD40 während der terminalen Reifung von murinen dendritischen Zellen inhibiert wird. Die während der langfristigen in vitro Kultur auf CEF-Zellen entstandenen Deletionen im MVA Genom führten zu einer starken Attenuierung und dem Verlust einiger Gene, die immunmodulatorische Proteine kodieren, jedoch nicht zu einer Verminderung des zytopathischen Effekts in dendritischen Zellen. Die geringe Expressionsrate und die beobachtete Inhibition der Expression kostimulatorischer Moleküle auf dendritischen Zellen kann für eine wenig effektive Induktion einer Immunantwort in MVA vakzinierten Tieren durch cross priming oder die direkte Infektion antigenpräsentierender Zellen verantwortlich sein. Durch die Modifikation einer Methode zur intrazellulären IFN-gamma Färbung konnten in vakzinierten Mäusen tumorantigenspezifische CTL sensitiv und quantitativ detektiert werden. Die so bestimmte CTL-Frequenz, nicht jedoch die humorale Antwort, korrelierte mit der in vivo Wirksamkeit der verschiedenen Vakzinen: DNA vakzinierte Tiere entwickeln starke tumorantigenspezifische CTL-Antworten, wohingegen in MVA-vakzinierten Tieren überwiegend gegen virale Epitope gerichtete CD4 und CD8-T-Zellen detektiert wurden. Die Wirksamkeit der pCI-DNA-Vakzine spricht für die Weiterentwicklung in weiteren präklinischen Mausmodellen, beispielsweise unter Verwendung von MUC1 oder HLA-A2 transgenen Mäusen. Die Methoden zur Detektion Tumorantigen-spezifischer CTL in 96-Loch-Mikrotiterplatten können dabei zur systematischen Suche nach im Menschen immundominanten T-Zell-Epitopen im Muzin-Molekül genutzt werden. Der durchgeführte Vergleich der auf den Vektoren pCI und MVA basierenden Vakzinen und die Analyse neuerer Publikationen führen zu dem Ergebnis, daß vor allem DNA-Vakzinen in Zukunft eine wichtige Rolle bei der Entwicklung von aktiven Tumorimpfstoffen spielen werden. Rekombinante MVA-Viren, eventuell in Kombination mit DNA- oder anderen Vektoren, haben sich dagegen in zahlreichen Studien als wirksame Impfstoffe zur Kontrolle von durch Pathogene hervorgerufenen Infektionserkrankungen erwiesen.
Escherichia (E.) coli ist als kommensales Bakterium ein wichtiger Bestandteil des Mikrobioms von Säugern, jedoch zudem der häufigste Infektionserreger des Menschen. Entsprechend des Infektionsortes werden intestinal (InPEC) und extraintestinal pathogene E. coli (ExPEC) unterschieden. Die Pathogenese von E. coli-Infektionen ist durch Virulenzfaktoren determiniert, welche von jeweils spezifischen virulenzassoziierten Genen (inVAGs und exVAGs) kodiert werden. Häufig werden exVAGs auch in E. coli-Isolaten aus dem Darm gesunder Wirte nachgewiesen. Dies führte zu der Vermutung, dass exVAGs die intestinale Kolonisierung des Wirtes durch E. coli unterstützen. Das Hauptziel dieser Arbeit bestand darin, das Wissen über den Einfluss von exVAGs auf die Besiedlung und damit die Adhäsion von E. coli an Epithelzellen des Darmtraktes zu erweitern. Die Durchführung einer solch umfassenden E. coli-Populationsstudie erforderte die Etablierung neuer Screeningmethoden. Für die genotypische Charakterisierung wurden mikropartikelbasierte Multiplex-PCR-Assays zum Nachweis von 44 VAGs und der Phylogenie etabliert. Für die phänotypische Charakterisierung wurden Adhäsions- und Zytotoxizitätsassays etabliert. Die Screeningmethoden basieren auf der VideoScan-Technologie, einem automatisierten bildbasierten Multifluoreszenzdetektionssystem. Es wurden 398 E. coli-Isolate aus 13 Wildsäugerarten und 5 Wildvogelarten sowie aus gesunden und harnwegserkrankten Menschen und Hausschweinen charakterisiert. Die Adhäsionsassays hatten zum Ziel, sowohl die Adhäsionsraten als auch die Adhäsionsmuster der 317 nicht hämolytischen Isolate auf 5 Epithelzelllinien zu bestimmen. Die Zytotoxizität der 81 hämolytischen Isolate wurde in Abhängigkeit der Inkubationszeit auf 4 Epithelzelllinien geprüft. In den E. coli-Isolaten wurde eine Reihe von VAGs nachgewiesen. Potentielle InPEC, insbesondere shigatoxinproduzierende und enteropathogene E. coli wurden aus Menschen, Hausschweinen und Wildtieren, vor allem aus Rehen und Feldhasen isoliert. exVAGs wurden mit stark variierender Prävalenz in Isolaten aus allen Arten detektiert. Die größte Anzahl und das breiteste Spektrum an exVAGs wurde in Isolaten aus Urin harnwegserkrankter Menschen, gefolgt von Isolaten aus Dachsen und Rehen nachgewiesen. In Isolaten der phylogenetischen Gruppe B2 wurden mehr exVAGs detektiert als in den Isolaten der phylogenetischen Gruppen A, B1 und D. Die Ergebnisse der Adhäsionsassays zeigten, dass die meisten Isolate zelllinien-, gewebe- oder wirtsspezifisch adhärierten. Ein Drittel der Isolate adhärierte an keiner Zelllinie und nur zwei Isolate adhärierten stark an allen Zelllinien. Grundsätzlich adhärierten mehr Isolate an humanen sowie an intestinalen Zelllinien. Besonders Isolate aus Eichhörnchen und Amseln sowie aus Urin harnwegserkrankter Menschen und Hausschweine waren in der Lage, stark zu adhärieren. Hierbei bildeten die Isolate als Adhäsionsmuster diffuse Adhäsion, Mikrokolonien, Ketten und Agglomerationen. Mittels statistischer Analysen wurden Assoziationen zwischen exVAGs und einer hohen Adhäsionsrate ersichtlich. So war beispielsweise das Vorkommen von afa/dra mit einer höheren Adhäsionsrate auf Caco-2- und 5637-Zellen und von sfa/foc auf IPEC-J2-Zellen assoziiert. Die Ergebnisse der Zytotoxizitätsassays zeigten eine sehr starke und zeitabhängige Zerstörung der Monolayer aller Epithelzelllinien durch die α-Hämolysin-positiven Isolate. Auffallend war die hohe Toxizität hämolytischer Isolate aus Wildtieren gegenüber den humanen Zelllinien. Mit den innerhalb dieser Arbeit entwickelten Screeningmethoden war es möglich, große Mengen an Bakterien zu charakterisieren. Es konnte ein Überblick über die Verbreitung von VAGs in E. coli aus unterschiedlichen Wirten gewonnen werden. Besonders Wildtiere wurden sowohl durch den Nachweis von VAGs in den entsprechenden Isolaten, verbunden mit deren Adhäsionsfähigkeit und ausgeprägter Zytotoxizität als Reservoire pathogener E. coli identifiziert. Ebenso wurde eine zelllinienspezifische Adhäsion von Isolaten mit bestimmten exVAGs deutlich. Damit konnte der mögliche Einfluss von exVAGs auf die intestinale Kolonisierung bestätigt werden. In weiterführenden Arbeiten sind jedoch Expressions- und Funktionsanalysen der entsprechenden Proteine unerlässlich. Es wird anhand der Mikrokoloniebildung durch kommensale E. coli vermutet, dass Adhäsionsmuster und demzufolge Kolonisierungsstrategien, die bisher pathogenen E. coli zugeschrieben wurden, eher als generelle Kolonisierungsstrategien zu betrachten sind. Das E. coli-α-Hämolysin wirkt im Allgemeinen zytotoxisch auf Epithelzellen. Ein in der Fachliteratur diskutierter adhäsionsunterstützender Mechanismus dieses Toxins ist demnach fragwürdig. Innerhalb dieser Arbeit konnte gezeigt werden, dass die entwickelten Screeningmethoden umfassende Analysen einer großen Anzahl an E. coli-Isolaten ermöglichen.
Im Rahmen dieser Arbeit gelang es, katalytische Antikörper zur Hydrolyse von Benzylphenylcarbamaten sowie zahlreiche monoklonale Antikörper gegen Haptene herzustellen. Es wurden verschiedene Hapten-Protein-Konjugate unter Verwendung unterschiedlicher Kopplungsmethoden hergestellt und charakterisiert. Zur Generierung der hydrolytisch aktiven Antikörper wurden Inzuchtmäuse mit KLH-Konjugaten von 4 Übergangszustandsanaloga (ÜZA) immunisiert. Mit Hilfe der Hybridomtechnik wurden verschiedene monoklonale Antikörper gegen diese ÜZA gewonnen. Dabei wurden sowohl verschiedene Immunisierungsschemata als auch verschiedene Inzuchtmausstämme und Fusionstechniken verwendet. Insgesamt wurden 32 monoklonale Antikörper gegen die verwendeten ÜZA selektiert. Diese Antikörper wurden in großen Mengen hergestellt und gereinigt. Zum Nachweis der Antikörper-vermittelten Katalyse wurden verschiedene Methoden entwickelt und eingesetzt, darunter immunologische Nachweismethoden mit Anti-Substrat- und Anti-Produkt-Antikörpern und eine photometrische Methode mit Dimethylaminozimtaldehyd. Der Nachweis der hydrolytischen Aktivität gelang mit Hilfe eines Enzymsensors, basierend auf immobilisierter Tyrosinase. Die Antikörper N1-BC1-D11, N1-FA7-C4, N1-FA7-D12 und R3-LG2-F9 hydrolysierten die Benzylphenylcarbamate POCc18, POCc19 und Substanz 27. Der Nachweis der hydrolytischen Aktivität dieser Antikörper gelang auch mit Hilfe der HPLC. Der katalytische Antikörper N1-BC1-D11 wurde kinetisch und thermodynamisch untersucht. Es wurde eine Michaelis-Menten-Kinetik mit Km von 210 µM, vmax von 3 mM/min und kcat von 222 min-1 beobachtet. Diese Werte korrelieren mit den Werten der wenigen bekannten Diphenylcarbamat-spaltenden Abzyme. Die Beschleunigungsrate des Antikörpers N1-BC1-D11 betrug 10. Das ÜZA Hei3 hemmte die hydrolytische Aktivität. Dies beweist, dass die Hydrolyse in der Antigenbindungsstelle stattfindet. Weiter wurde zwischen der Antikörperkonzentration und der Umsatzgeschwindigkeit eine lineare Abhängigkeit festgestellt. Die thermodynamische Gleichtgewichtsdissoziationskonstante KD des Abzyms von 2,6 nM zeugt von einer sehr guten Affinität zum ÜZA. Hydrolytisch aktiv waren nur Antikörper, die gegen das Übergangszustandsanalogon Hei3 hergestellt worden waren. Es wird vermutet, dass die Hydrolyse der Benzylphenylcarbamate über einen Additions-Eliminierungsmechanismus unter Ausbildung eines tetraedrischen Übergangszustandes verläuft, dessen analoge Verbindung Hei3 ist. Im Rahmen der Generierung von Nachweisantikörpern zur Detektion der Substratabnahme bei der Hydrolyse wurden Anti-Diuron-Antikörper hergestellt. Einer der Antikörper (B91-CG5) ist spezifisch für das Herbizid Diuron und hat einen IC50-Wert von 0,19 µg/l und eine untere Nachweisgrenze von 0,04 µg/l. Ein anderer Antikörper (B91-KF5) reagiert kreuz mit einer Palette ähnlicher Herbizide. Mit diesen Antikörpern wurde ein empfindlicher Labortest, der ein Monitoring von Diuron auf Grundlage des durch die Trinkwasserverordnung festgeschriebenen Wertes für Pflanzenschutzmittel von 0,1 µg/l erlaubt, aufgebaut. Der Effekt der Anti-Diuron-Antikörper auf die Diuron-inhibierte Photosynthese wurde in vitro und in vivo untersucht. Es wurde nachgewiesen, dass sowohl in isolierten Thylakoiden, als auch in intakten Algen eine Vorinkubation der Anti-Diuron-Antikörper mit Diuron zur Inaktivierung seiner Photosynthese-hemmenden Wirkung führt. Wurde der Elektronentransport in den isolierten Thylakoiden oder in Algen durch Diuron unterbrochen, so führte die Zugabe der Anti-Diuron-Antikörper zur Reaktivierung der Elektronenübertragung.
Unspecific peroxygenases (UPOs, EC 1.11.2.1) are fungal enzymes that catalyze the oxyfunctionalization of non-activated hydrocarbons, making them valuable biocatalysts. Despite the increasing interest in UPOs that has led to the identification of thousands of putative UPO genes, only a few of these have been successfully expressed and characterized.
There is currently no universal expression system in place to explore their full potential. Cell-free protein synthesis has proven to be a sophisticated technique for the synthesis of difficult-to-express proteins.
In this work, we aimed to establish an insect-based cell-free protein synthesis (CFPS) platform to produce UPOs. CFPS relies on translationally active cell lysates rather than living cells.
The system parameters can thus be directly manipulated without having to account for cell viability, thereby making it highly adaptable.
The insect-based lysate contains translocationally active, ER-derived vesicles, called microsomes.
These microsomes have been shown to allow efficient translocation of proteins into their lumen, promoting post-translational modifications such as disulfide bridge formation and N-glycosylations.
In this study the ability of a redox optimized, vesicle-based, eukaryotic CFPS system to synthesize functional UPOs was explored. The influence of different reaction parameters as well as the influence of translocation on enzyme activity was evaluated for a short UPO from Marasmius rotula and a long UPO from Agrocybe aegerita.
The capability of the CFPS system described here was demonstrated by the successful synthesis of a novel UPO from Podospora anserina, thus qualifying CFPS as a promising tool for the identification and evaluation of novel UPOs and variants thereof.
Vielfalt in der Uckermark
(2019)
Secretory Wnt trafficking can be studied in the polarized epithelial monolayer of Drosophila wing imaginal discs (WID). In this tissue, Wg (Drosophila Wnt-I) is presented on the apical surface of its source cells before being internalized into the endosomal pathway. Long-range Wg secretion and spread depend on secondary secretion from endosomal compartments, but the exact post-endocytic fate of Wg is poorly understood. Here, we summarize and present three protocols for the immunofluorescencebased visualization and quantitation of different pools of intracellular and extracellular Wg in WID: (1) steady-state extracellular Wg; (2) dynamic Wg trafficking inside endosomal compartments; and (3) dynamic Wg release to the cell surface. Using a genetic driver system for gene manipulation specifically at the posterior part of the WID (EnGal4) provides a robust internal control that allows for direct comparison of signal intensities of control and manipulated compartments of the same WID. Therefore, it also circumvents the high degree of staining variability usually associated with whole-tissue samples. In combination with the genetic manipulation of Wg pathway components that is easily feasible in Drosophila, these methods provide a tool-set for the dissection of secretory Wg trafficking and can help us to understand how Wnt proteins travel along endosomal compartments for short-and long-range signal secretion.
This study was conducted in order to examine the differences between visualizers and verbalizers in the way they gaze at pictures and texts while learning. Using a collection of questionnaires, college students were classified according to their visual or verbal cognitive style and were asked to learn about two different, in terms of subject and type of knowledge, topics by means of text-picture combinations. Eye-tracking was used to investigate their gaze behavior. The results show that visualizers spent significantly more time inspecting pictures than verbalizers, while verbalizers spent more time inspecting texts. Results also suggest that both visualizers' and verbalizers' way of learning is active but mostly within areas providing the source of information in line with their cognitive style (pictures or text). Verbalizers tended to enter non-informative, irrelevant areas of pictures sooner than visualizers. The comparison of learning outcomes showed that the group of visualizers achieved better results than the group of verbalizers on a comprehension test.
Background
The kidneys are essential for the metabolism of vitamin A (retinol) and its transport proteins retinol-binding protein 4 (RBP4) and transthyretin. Little is known about changes in serum concentration after living donor kidney transplantation (LDKT) as a consequence of unilateral nephrectomy; although an association of these parameters with the risk of cardiovascular diseases and insulin resistance has been suggested. Therefore we analyzed the concentration of retinol, RBP4, apoRBP4 and transthyretin in serum of 20 living-kidney donors and respective recipients at baseline as well as 6 weeks and 6 months after LDKT.
Results
As a consequence of LDKT, the kidney function of recipients was improved while the kidney function of donors was moderately reduced within 6 weeks after LDKT. With regard to vitamin A metabolism, the recipients revealed higher levels of retinol, RBP4, transthyretin and apoRBP4 before LDKT in comparison to donors. After LDKT, the levels of all four parameters decreased in serum of the recipients, while retinol, RBP4 as well as apoRBP4 serum levels of donors increased and remained increased during the follow-up period of 6 months.
Conclusion
LDKT is generally regarded as beneficial for allograft recipients and not particularly detrimental for the donors. However, it could be demonstrated in this study that a moderate reduction of kidney function by unilateral nephrectomy, resulted in an imbalance of components of vitamin A metabolism with a significant increase of retinol and RBP4 and apoRBP4 concentration in serum of donors.
Vitamin E : elucidation of the mechanism of side chain degradation and gene regulatory functions
(2005)
For more than 80 years vitamin E has been in the focus of scientific research. Most of the progress concerning non-antioxidant functions, nevertheless, has only arisen from publications during the last decade. Most recently, the metabolic pathway of vitamin E has been almost completely elucidated. Vitamin E is metabolized by truncation of its side chain. The initial step of an omega-hydroxylation is carried out by cytochromes P450 (CYPs). This was evidenced by the inhibition of the metabolism of alpha-tocopherol by ketoconozole, an inhibitor of CYP3A expression, whereas rifampicin, an inducer of CYP3A expression increased the metabolism of alpha-tocopherol. Although the degradation pathway is identical for all tocopherols and tocotrienols, there is a marked difference in the amount of the release of metabolites from the individual vitamin E forms in cell culture as well as in experimental animals and in humans. Recent findings not only proposed an CYP3A4-mediated degradation of vitamin E but also suggested an induction of the metabolizing enzymes by vitamin E itself. In order to investigate how vitamin E is able to influence the expression of metabolizing enzymes like CYP3A4, a pregnane X receptor (PXR)-based reporter gene assay was chosen. PXR is a nuclear receptor which regulates the transcription of genes, e.g., CYP3A4, by binding to specific DNA response elements. And indeed, as shown here, vitamin E is able to influence the expression of CYP3A via PXR in an in vitro reporter gene assay. Tocotrienols showed the highest activity followed by delta- and alpha-tocopherol. An up-regulation of Cyp3a11 mRNA, the murine homolog of the human CYP3A4, could also be confirmed in an animal experiment. The PXR-mediated change in gene expression displayed the first evidence of a direct transcriptional activity of vitamin E. PXR regulates the expression of genes involved in xenobiotic detoxification, including oxidation, conjugation, and transport. CYP3A, e.g., is involved in the oxidative metabolism of numerous currently used drugs. This opens a discussion of possible side effects of vitamin E, but the extent to which supranutritional doses of vitamin E modulate these pathways in humans has yet to be determined. Additionally, as there is arising evidence that vitamin E's essentiality is more likely to be based on gene regulation than on antioxidant functions, it appeared necessary to further investigate the ability of vitamin E to influence gene expression. Mice were divided in three groups with diets (i) deficient in alpha-tocopherol, (ii) adequate in alpha-tocopherol supply and (iii) with a supranutritional dosage of alpha-tocopherol. After three months, half of each group was supplemented via a gastric tube with a supranutritional dosage of gamma-tocotrienol per day for 7 days. Livers were analyzed for vitamin E content and liver RNA was prepared for hybridization using cDNA array and oligonucleotide array technology. A significant change in gene expression was observed by alpha-tocopherol but not by gamma-tocotrienol and only using the oligonucleotide array but not using the cDNA array. The latter effect is most probably due to the limited number of genes represented on a cDNA array, the lacking gamma-tocotrienol effect is obviously caused by a rapid degradation, which might prevent bioefficacy of gamma-tocotrienol. Alpha-tocopherol changed the expression of various genes. The most striking observation was an up-regulation of genes, which code for proteins involved in synaptic transmitter release and calcium signal transduction. Synapsin, synaptotagmin, synaptophysin, synaptobrevin, RAB3A, complexin 1, Snap25, ionotropic glutamate receptors (alpha 2 and zeta 1) were shown to be up-regulated in the supranutritional group compared to the deficient group. The up-regulation of synaptic genes shown in this work are not only supported by the strong concentration of genes which all are involved in the process of vesicular transport of neurotransmitters, but were also confirmed by a recent publication. However, a confirmation by real time PCR in neuronal tissue like brain is now required to explain the effect of vitamin E on neurological functionality. The change in expression of genes coding for synaptic proteins by vitamin E is of principal interest thus far, since the only human disease directly originating from an inadequate vitamin E status is ataxia with isolated vitamin E deficiency. Therefore, with the results of this work, an explanation for the observed neurological symptoms associated with vitamin E deficiency can be presented for the first time.
Vitamin E wird immer noch als das wichtigste lipophile Antioxidanz in biologischen Membranen betrachtet. In den letzten Jahren hat sich jedoch der Schwerpunkt der Vitamin E-Forschung hin zu den nicht-antioxidativen Funktionen verlagert. Besonderes Interesse gilt dabei dem α-Tocopherol, der häufigsten Vitamin E-Form im Gewebe von Säugetieren, und seiner Rolle bei der Regulation der Genexpression. Das Ziel dieser Dissertation war die Untersuchung der genregulatorischen Funktionen von α-Tocoperol und die Identifizierung α-Tocopherol-sensitiver Gene in vivo. Zu diesem Zweck wurden Mäuse mit verschiedenen Mengen α-Tocopherol gefüttert. Die Analyse der hepatischen Genexpression mit Hilfe von DNA-Microarrays identifizierte 387 α-Tocopherol-sensitive Gene. Funktionelle Clusteranalysen der differentiell exprimierten Gene zeigten einen Einfluss von α-Tocooherol auf zelluläre Transportprozesse. Besonders solche Gene, die an vesikulären Transportvorgängen beteiligt sind, wurden größtenteils durch α-Tocopherol hochreguliert. Für Syntaxin 1C, Vesicle-associated membrane protein 1, N-ethylmaleimide-sensitive factor and Syntaxin binding protein 1 konnte eine erhöhte Expression mittels real time PCR bestätigt werden. Ein funktioneller Einfluss von α-Tocopherol auf vesikuläre Transportprozesse konnte mit Hilfe des in vitro β-Hexosaminidase Assays in der sekretorischen Mastzelllinie RBL-2H3 gezeigt werden. Die Inkubation der Zellen mit α-Tocopherol resultierte in einer konzentrationsabhängigen Erhöhung der PMA/Ionomycin-stimulierten Sekretion der β-Hexosaminidase. Eine erhöhte Expression ausgewählter Gene, die an der Degranulation beteiligt sind, konnte nicht beobachtet werden. Damit schien ein direkter genregulatorischer Effekt von α-Tocopherol eher unwahrscheinlich. Da eine erhöhte Sekretion auch mit β-Tocopherol aber nicht mit Trolox, einem hydrophilen Vitamin E-Analogon, gefunden wurde, wurde vermutet, dass α-Tocopherol die Degranulation möglicherweise durch seine membranständige Lokalisation beeinflussen könnte. Die Inkubation der Zellen mit α-Tocopherol resultierte in einer veränderten Verteilung des Gangliosids GM1, einem Lipid raft Marker. Es wird angenommen, dass diese Membranmikrodomänen als Plattformen für Signaltransduktionsvorgänge fungieren. Ein möglicher Einfluss von Vitamin E auf die Rekrutierung/Translokation von Signalproteinen in Membranmikrodomänen könnte die beobachteten Effekte erklären. Eine Rolle von α-Tocopherol im vesikulären Transport könnte nicht nur seine eigene Absorption und seinen Transport beeinflussen, sondern auch eine Erklärung für die bei schwerer Vitamin E-Defizienz auftretenden neuronalen Dysfunktionen bieten. Im zweiten Teil der Arbeit wurde die α-Tocopheroltransferprotein (Ttpa) Knockout-Maus als genetisches Modell für Vitamin E-Defizienz verwendet, um den Effekt von Ttpa auf die Genexpression und die Gewebeverteilung von α-Tocopherol zu analysieren. Ttpa ist ein cytosolisches Protein, das für die selektive Retention von α-Tocopherol in der Leber verantwortlich ist. Die Ttpa-Defizienz resultierte in sehr geringen α-Tocopherol-Konzentrationen im Plasma und den extrahepatischen Geweben. Die Analyse der α-Tocopherol-Gehalte im Gehirn wies auf eine Rolle von Ttpa bei der α-Tocopherol-Aufnahme ins Gehirn hin.
Nahrungsinhaltsstoffe sind im Organismus an Steuerungsprozessen und Stoffwechselvorgängen beteiligt, wobei die Mechanismen ihrer Wirkung noch nicht völlig aufgeklärt sind. Wie Vitamin E zeigen auch sekundäre Pflanzeninhaltsstoffe in Zellsystemen sowie in vivo eine Reihe biologischer Wirkungen, deren Erklärung jedoch häufig auf ihre antioxidative Eigenschaft reduziert wird. Ziel der Dissertation war es, den Einfluss von Vitamin E und anderen Pflanzeninhaltsstoffen (in Form von Pflanzenextrakten oder isolierten sekundären Pflanzeninhaltsstoffen, z.B. Polyphenole), die bisher alle hauptsächlich als Antioxidanz klassifiziert wurden, auf die transkriptionelle Regulation von Phase I- und Phase II-Enzymen zu untersuchen. Dazu wurde die Aktivierung des PXR (pregnane X receptor) und des Nrf2 (NF-E2-related factor-2) als zentrale Transkriptionsfaktoren der Phase I- bzw. Phase II-Enzyme getestet. Der Einfluss von verschiedenen Vitamin E-Formen und antioxidativen Pflanzeninhaltsstoffen in Form von Reinsubstanzen (Curcumin, EGCG, Medox, Quercetin, Resveratrol und Sulforaphan) oder Pflanzenextrakten (aus Blaubeeren, Gewürznelken, Himbeeren, Nelkenpfeffer, Thymian oder Walnüssen) auf die Aktivierung von PXR und Nrf2 sowie des Promotors eines jeweiligen Zielgens (CYP3A4 bzw. GI-GPx) wurde in vitro mit Reportergenplasmiden untersucht. Es zeigte sich, dass sowohl Vitamin E-Formen als auch verschiedene sekundäre Pflanzeninhaltsstoffe PXR und/oder Nrf2 sowie die Promotoren der jeweiligen Zielgene CYP3A4 bzw. GI-GPx aktivieren. In einem Tierexperiment konnte diese genregulatorische Wirkung von Vitamin E auf die in vivo-Situation übertragen werden. In Lebern von Mäusen, deren Futter unterschiedliche Mengen von Vitamin E enthielt (Mangel-, Normal- und Überflussdiät), wurde eine direkte Korrelation zwischen der alpha-Tocopherol-Konzentration und der Cyp3a11 mRNA-Expression nachgewiesen (Cyp3a11 ist das murine Homolog zum humanen CYP3A4). Entgegen der in vitro-Situation hatte gamma-Tocotrienol in vivo einen nur kaum nachweisbaren Effekt auf die Expression der Cyp3a11 mRNA, induzierte aber die Expression der alpha-TTP mRNA. Es konnte gezeigt werden, dass Vitamin E und sekundäre Pflanzeninhaltsstoffe Phase I- und Phase II-Enzyme transkriptionell regulieren können. Die Wirkungen des Vitamin E können sich allerdings nur entfalten, wenn die Vitamin E-Formen ausreichend vom Körper aufgenommen werden. Gegenstand der Dissertation waren daher auch Untersuchungen zur Bioverfügbarkeit (zelluläre Akkumulation und Metabolismus) verschiedener Vitamin E-Formen. Es konnte gezeigt werden, dass Unterschiede in der chemischen Struktur der Vitamin E-Formen deren zelluläre Akkumulation und Metabolisierung beeinflussen. Unter Berücksichtigung der Ergebnisse der Dissertation lassen sich protektive Wirkungen von antioxidativen Nahrungsinhaltsstoffen auch unabhängig von ihren antioxidativen Eigenschaften über die Induktion zelleigener Schutzsysteme, einschließlich der Phase I- und Phase II-Enzyme, erklären. Die Induktion der zelleigenen Abwehr lässt sich auch als adaptive Antwort (sog. "adaptive response") des Organismus gegenüber zellschädigenden Ereignissen betrachten.
Vorwort
(2019)
Weltweit versuchen Wissenschaftler, künstliche Viren für den Gentransfer zu konstruieren, die nicht reproduktionsfähig sind. Diese sollen die Vorteile der natürlichen Viren besitzen (effizienter Transport von genetischem Material), jedoch keine Antigene auf ihrer Oberfläche tragen, die Immunreaktionen auslösen. Ziel dieses Projektes ist es, einen künstlichen Viruspartikel herzustellen, dessen Basis eine Polyelektrolytenhohlkugel bildet, die mit einer Lipiddoppelschicht bedeckt ist. Um intakte Doppelschichten zu erzeugen, muss die Wechselwirkung zwischen Lipid und Polyelektrolyt (z.B. DNA) verstanden und optimiert werden. Dazu ist es notwendig, die strukturelle Grundlage der Interaktion aufzuklären. Positiv geladene Lipide gehen zwar starke Wechselwirkungen mit der negativ geladenen DNA ein, sie wirken jedoch toxisch auf biologische Zellen. In der vorliegenden Arbeit wurde daher die durch zweiwertige Kationen vermittelte Kopplung von genomischer oder Plasmid-DNA an zwitterionische oder negativ geladene Phospholipide an zwei Modellsystemen untersucht. 1. Modellsystem: Lipidmonoschicht an der Wasser/Luft-Grenzfläche Methoden: Filmwaagentechnik in Kombination mit IR-Spektroskopie (IRRAS), Röntgenreflexion (XR), Röntgendiffraktion (GIXD), Brewsterwinkel-Mikroskopie (BAM), Röntgenfluoreszenz (XRF) und Oberflächenpotentialmessungen Resultate: A) Die Anwesenheit der zweiwertigen Kationen Ba2+, Mg2+, Ca2+ oder Mn2+ in der Subphase hat keinen nachweisbaren Einfluss auf die Struktur der zwitterionischen DMPE- (1,2-Dimyristoyl-phosphatidyl-ethanolamin) Monoschicht. B) In der Subphase gelöste DNA adsorbiert nur in Gegenwart dieser Kationen an der DMPE-Monoschicht. C) Sowohl die Adsorption genomischer Kalbsthymus-DNA als auch der Plasmid-DNA pGL3 bewirkt eine Reduktion des Neigungswinkels der Alkylketten, die auf einen veränderten Platzbedarf der Kopfgruppe zurückzuführen ist. Durch die Umorientierung der Kopfgruppe wird die elektrostatische Wechselwirkung zwischen den positiv geladenen Stickstoffatomen der Lipidkopfgruppen und den negativ geladenen DNA-Phosphaten erhöht. D) Die adsorbierte DNA weist eine geordnete Struktur auf, wenn sie durch Barium-, Magnesium-, Calcium- oder Manganionen komplexiert ist. Der Abstand zwischen parallelen DNA-Strängen hängt dabei von der Größe der DNA-Fragmente sowie von der Art des Kations ab. Die größten Abstände ergeben sich mit Bariumionen, gefolgt von Magnesium- und Calciumionen. Die kleinsten DNA-Abstände werden durch Komplexierung mit Manganionen erhalten. Diese Ionenreihenfolge stellt sich sowohl für genomische DNA als auch für Plasmid-DNA ein. E) Die DNA-Abstände werden durch die Kompression des Lipidfilms nicht beeinflusst. Zwischen der Lipidmonoschicht und der adsorbierten DNA besteht demnach nur eine schwache Wechselwirkung. Offensichtlich befindet sich die durch zweiwertige Kationen komplexierte DNA als weitgehend eigenständige Schicht unter dem Lipidfilm. 2. Modellsystem: Lipiddoppelschicht an der fest/flüssig-Grenzfläche Methoden: Neutronenreflexion (NR) und Quarzmikrowaage (QCM-D) Resultate: A) Das zwitterionische Phospholipid DMPC (1,2-Dimyristoyl-phosphatidylcholin) bildet keine Lipiddoppelschicht auf planaren Polyelektrolytmultischichten aus, deren letzte Lage das positiv geladene PAH (Polyallylamin) ist. B) Hingegen bildet DMPC auf dem negativ geladenen PSS (Polystyrolsulfonat) eine Doppelschicht aus, die jedoch Defekte aufweist. C) Eine Adsorption von genomischer Kalbsthymus-DNA auf dieser Lipidschicht findet nur in Gegenwart von Calciumionen statt. Andere zweiwertige Kationen wurden nicht untersucht. D) Das negativ geladene Phospholipid DLPA (1,2-Dilauryl-phosphatidsäure) bildet auf dem positiv geladenen PAH eine Lipiddoppelschicht aus, die Defekte aufweist. E) DNA adsorbiert ebenfalls erst in Anwesenheit von Calciumionen in der Lösung an die DLPA-Schicht. F) Durch die Zugabe von EDTA (Ethylendiamintetraessigsäure) werden die Calciumionen dem DLPA/DNA-Komplex entzogen, wodurch dieser dissoziiert. Demnach ist die calciuminduzierte Bildung dieser Komplexe reversibel.
Die vorliegende Arbeit wurde im Zeitraum von Oktober 2002 bis November 2005 an dem Institut für Biochemie und Biologie der Universität Potsdam in Kooperation mit dem Institut für Chemie des GKSS Forschungszentrums in Teltow unter der Leitung von Herrn Prof. Dr. B. Micheel und Herrn Prof. Dr. Th. Groth angefertigt. Im Rahmen dieser Arbeit wurden die Wechselwirkungen von Immunzellen mit verschiedenen Kultursubstraten untersucht. Dafür wurden drei verschiedene Hybridomzelllinien eingesetzt. Eine Hybridomzelllinie (K2) ist im Laufe dieser Arbeit hergestellt und etabliert worden. Der Einsatz von synthetischen und proteinbeschichteten Kulturoberflächen führte bei Hybridomzellen zu einer deutlich gesteigerten Antikörpersynthese im Vergleich zu herkömmlichen Zellkulturmaterialien. Obwohl diese Zellen in der Regel als Suspensionszellen kultiviert werden, führten die eingesetzten Polymermembranen (PAN, NVP) zu einer verbesserten Antikörpersynthese (um 30%) gegenüber Polystyrol als Referenz. Es konnte gezeigt werden, dass es einen Zusammenhang zwischen der Produktivität und dem Adh asionsverhalten der Hybridomzellen gibt. Um den Einfluss von Proteinen der extrazellulären Matrix auf Zellwachstum und Antikörpersynthese von Hybridomzellen zu untersuchen, wurden proteinbeschichtete Polystyrol-Oberflächen eingesetzt. Für die Modifikationen wurden Fibronektin, Kollagen I, Laminin und BSA ausgewählt. Die Modifikation der Polystyrol-Oberfläche mit geringen Mengen Fibronektin (0,2-0,4 µg/ml) führte zu einer beträchtlichen Steigerung der Antikörpersynthese um 70-120%. Für Kollagen I- und BSA-Beschichtungen konnten Steigerungen von 40% beobachtet werden. Modifikationen der Polystyrol-Oberfläche mit Laminin zeigten nur marginale Effekte. Durch weitere Versuche wurde bestätigt, dass die Adhäsion der Zellen an Kollagen I- und Laminin-beschichteten Oberflächen verringert ist. Die alpha2-Kette des alpha2beta1-Integrins konnte auf der Zelloberfläche nicht nachgewiesen werden. Durch ihr Fehlen wird wahrscheinlich die Bindungsfähigkeit der Zellen an Kollagen I und Laminin beeinflusst. Durch die Ergebnisse konnte gezeigt werden, dass Hybridomzellen nicht nur Suspensionszellen sind und das Kultursubstrate das Zellwachstum und die Produktivität dieser Zellen stark beeinflussen können. Der Einsatz von synthetischen und proteinbeschichteten Kultursubstraten zur Steigerung der Antikörpersynthese kann damit für die industrielle Anwendung von großer Relevanz sein. Für die Modellierung einer Lymphknotenmatrix wurden Fibronektin, Kollagen I, Heparansulfat und N-Acetylglucosamin-mannose in verschiedenen Kombinationen an Glasoberflächen adsorbiert und für Versuche zur In-vitro-Immunisierung eingesetzt. Es konnte gezeigt werden, dass die Modifikation der Oberflächen die Aktivierung und Interaktion von dendritischen Zellen, T- und B-Lymphozyten begünstigt, was durch den Nachweis spezifischer Interleukine (IL12, IL6) und durch die Synthese spezifischer Antikörper bestätigt wurde. Eine spezifische Immunreaktion gegen das Antigen Ovalbumin konnte mit den eingesetzten Zellpopulationen aus Ovalbumin-T-Zell-Rezeptor-transgenen Mäusen nachgewiesen werden. Die In-vitro-Immunantwort wurde dabei am stärksten durch eine Kombination von Kollagen I, Heparansulfat und N-Acetylglucosamin-mannose auf einer Glasoberfläche gefördert. Die Etablierung einer künstlichen Immunreaktion kann eine gesteuerte Aktivierung bzw. Inaktivierung von körpereigenen dendritischen Zellen gegen bestehende Krankheitsmerkmale in vitro ermöglichen. Durch die Versuche wurden Grundlagen für spezifische Immunantworten erarbeitet, die u.a. für die Herstellung von humanen Antikörpern eingesetzt werden können.
Background In view of the ongoing debate on "chronic malnutrition" and the concept of "stunting" as "a better measure than underweight of the cumulative effects of undernutrition and infection (WHO)", we translate, briefly comment and republish three seminal historic papers on catch-up growth following re-feeding after severe food restriction of German children during and after World War I. The observations were published in 1920 and 1922, and appear to be of particular interest to the modern nutritionist. Results The papers of Abderhalden (1920) and Bloch (1920) describe German children of all social strata who were born shortly before World War I, and raised in apparently "normal" families. After severe long-standing undernutrition, they participated in an international charity program. They experienced exceptional catch-up growth in height of 3-5 cm within 6-8 weeks. Goldstein (1922) observed 512 orphans and children from underprivileged families. Goldstein described very different growth patterns. These children were much shorter (mean height between -2.0 and -2.8 SDS, modern WHO reference). They mostly failed to catch-up in height, but tended to excessively increase in weight particularly during adolescence.
Substanzen der pharmazeutischen und chemischen Industrie müssen nach internationalen Richtlinien auf deren Toxizität gegenüber Mensch und Umwelt geprüft werden. Dazu gehören u. a. Prüfungen zur Vorhersage des embryotoxischen Potentials, die am lebenden Organismus durchgeführt werden. Mit dem Ziel die Anzahl der Tierversuche zu verringern, die notwendig sind um das toxikologische Profil einer Prüfsubstanz zu bestimmen, wurde der Embryonale Stammzelltest (EST) entwickelt. Als Grundlage des EST dienen embryonale Stammzellen (ES-Zellen) einer Zelllinie. ES-Zellen sind Zellen, die sich in der frühen embryonalen Entwicklung in die Zellen der Keimblätter entwickeln können. Daraus wiederum differenzieren die vielen verschiedenen, unterschiedlich spezialisierten Zelltypen des komplexen Organismus. Im EST wird die Konzentration einer Prüfsubstanz bestimmt, bei der die Differenzierung von ES-Zellen zu Herzmuskelzellen zu 50 % inhibiert wird. Zusätzlich wird die Konzentration der Prüfsubstanz bestimm°t, bei der 50 % der ES-Zellen (IC50D3) bzw. Fibroblastenzellen (IC503T3) absterben. Die allgemeine Toxizität ist damit von der spezifischen Toxizität der Prüfsubstanz auf die ES-Zellen und deren Differenzierung unterscheidbar. Die Parameter fliessen in ein biostatistisches Modell zur Prädiktion des embryotoxischen Potentials der Prüfsubstanzen ein. Es wurde ein Versuchsprotokoll entwickelt, wonach die ES-Zellen sich verstärkt zu Endothelzellen differenzieren. Die Endothelzellen, die im lebenden Organismus die Wand der späteren Blutgefässe, wie Venen und Arterien bilden, wurden mittels molekularbiologischer Methoden auf der RNA- und der Protein-Ebene nachgewiesen und quantifiziert. Verschiedene Zellkulturmethoden, Wachstumsfaktoren, als auch Wachstumsfaktorkonzentrationen wurden auf deren Vermögen die Differenzierung der ES-Zellen zu Endothelzellen zu induzieren, untersucht. Nach der Etablierung des Differenzierungsprotokolls wurden sieben Substanzen auf deren Vermögen geprüft, die Differenzierung von ES-Zellen zu Endothelzellen zu inhibieren. Die Endothelzellen wurden dabei über die Expression der RNA von zwei endothelzellspezifischen Genen quantifiziert. Im Vergleich dazu wurden die IC50D3 und die IC503T3 der Prüfsubstanz bestimmt, um eine Abschätzung des embryotoxischen Potentials der Prüfsubstanz zu ermöglichen. Die Ergebnisse zeigten, dass eine Abschätzung des embryotoxischen Potentials der sieben Prüfsubstanzen in nicht-, schwach- oder stark embryotoxisch vorgenommen werden konnte. Es ist zu schlussfolgern, dass der weiterentwickelte in vitro Embryotoxizitätsassay sensitiv und reproduzierbar ist. Mit der Verwendung von verschiedenen Differenzierungsendpunkten kann die Prädiktionskraft des Assays deutlich verbessert, und die Anzahl von Tierversuchen verringert werden. Durch die Verwendung von molekularbiologischen Markern kann der Assay einem Hochdurchsatzscreening zugängig gemacht werden und damit die Anzahl von Prüfsubstanzen deutlich erhöht werden.
Das Centrosom von Dictyostelium ist acentriolär aufgebaut, misst ca. 500 nm und besteht aus einer dreischichten Core-Struktur mit umgebender Corona, an der Mikrotubuli nukleieren. In dieser Arbeit wurden das centrosomale Protein Cep192 und mögliche Interaktionspartner am Centrosom eingehend untersucht. Die einleitende Lokalisationsuntersuchung von Cep192 ergab, dass es während der gesamten Mitose an den Spindelpolen lokalisiert und im Vergleich zu den anderen Strukturproteinen der Core-Struktur am stärksten exprimiert ist. Die dauerhafte Lokalisation an den Spindelpolen während der Mitose wird für Proteine angenommen, die in den beiden identisch aufgebauten äußeren Core-Schichten lokalisieren, die das mitotische Centrosom formen. Ein Knockdown von Cep192 führte zur Ausbildung von überzähligen Mikrotubuli-organisierenden Zentren (MTOC) sowie zu einer leicht erhöhten Ploidie. Deshalb wird eine Destabilisierung des Centrosoms durch die verminderte Cep192-Expression angenommen. An Cep192 wurden zwei kleine Tags, der SpotH6- und BioH6-Tag, etabliert, die mit kleinen fluoreszierenden Nachweiskonjugaten markiert werden konnten. Mit den so getagten Proteinen konnte die hochauflösende Expansion Microscopy für das Centrosom optimiert werden und die Core-Struktur erstmals proteinspezifisch in der Fluoreszenzmikroskopie dargestellt werden. Cep192 lokalisiert dabei in den äußeren Core-Schichten. Die kombinierte Markierung von Cep192 und den centrosomalen Proteinen CP39 und CP91 in der Expansion Microscopy erlaubte die Darstellung des dreischichtigen Aufbaus der centrosomalen Core-Struktur, wobei CP39 und CP91 zwischen Cep192 in der inneren Core-Schicht lokalisieren. Auch die Corona wurde in der Expansion Microscopy untersucht: Das Corona-Protein CDK5RAP2 lokalisiert in räumlicher Nähe zu Cep192 in der inneren Corona. Ein Vergleich der Corona-Proteine CDK5RAP2, CP148 und CP224 in der Expansion Microscopy ergab unterscheidbare Sublokalisationen der Proteine innerhalb der Corona und relativ zur Core-Struktur. In Biotinylierungsassays mit den centrosomalen Core-Proteinen CP39 und CP91 sowie des Corona-Proteins CDK5RAP2 konnte Cep192 als möglicher Interaktionspartner identifiziert werden.
Die Ergebnisse dieser Arbeit zeigen die wichtige Funktion des Proteins Cep192 im Dictyostelium-Centrosom und ermöglichen durch die Kombination aus Biotinylierungsassays und Expansion Microscopy der untersuchten Proteine ein verbessertes Verständnis der Topologie des Centrosoms.
Welcome to the dark side
(2022)
Differences in natural light conditions caused by changes in moonlight are known to affect perceived predation risk in many nocturnal prey species. As artificial light at night (ALAN) is steadily increasing in space and intensity, it has the potential to change movement and foraging behavior of many species as it might increase perceived predation risk and mask natural light cycles. We investigated if partial nighttime illumination leads to changes in foraging behavior during the night and the subsequent day in a small mammal and whether these changes are related to animal personalities. We subjected bank voles to partial nighttime illumination in a foraging landscape under laboratory conditions and in large grassland enclosures under near natural conditions. We measured giving-up density of food in illuminated and dark artificial seed patches and video recorded the movement of animals. While animals reduced number of visits to illuminated seed patches at night, they increased visits to these patches at the following day compared to dark seed patches. Overall, bold individuals had lower giving-up densities than shy individuals but this difference increased at day in formerly illuminated seed patches. Small mammals thus showed carry-over effects on daytime foraging behavior due to ALAN, i.e., nocturnal illumination has the potential to affect intra- and interspecific interactions during both night and day with possible changes in personality structure within populations and altered predator-prey dynamics.
Welcome to the Dark Side
(2022)
Differences in natural light conditions caused by changes in moonlight are known to affect perceived predation risk in many nocturnal prey species. As artificial light at night (ALAN) is steadily increasing in space and intensity, it has the potential to change movement and foraging behavior of many species as it might increase perceived predation risk and mask natural light cycles. We investigated if partial nighttime illumination leads to changes in foraging behavior during the night and the subsequent day in a small mammal and whether these changes are related to animal personalities. We subjected bank voles to partial nighttime illumination in a foraging landscape under laboratory conditions and in large grassland enclosures under near natural conditions. We measured giving-up density of food in illuminated and dark artificial seed patches and video recorded the movement of animals. While animals reduced number of visits to illuminated seed patches at night, they increased visits to these patches at the following day compared to dark seed patches. Overall, bold individuals had lower giving-up densities than shy individuals but this difference increased at day in formerly illuminated seed patches. Small mammals thus showed carry-over effects on daytime foraging behavior due to ALAN, i.e., nocturnal illumination has the potential to affect intra- and interspecific interactions during both night and day with possible changes in personality structure within populations and altered predator-prey dynamics.
Welcome to the Dark Side
(2022)
Differences in natural light conditions caused by changes in moonlight are known to affect perceived predation risk in many nocturnal prey species. As artificial light at night (ALAN) is steadily increasing in space and intensity, it has the potential to change movement and foraging behavior of many species as it might increase perceived predation risk and mask natural light cycles. We investigated if partial nighttime illumination leads to changes in foraging behavior during the night and the subsequent day in a small mammal and whether these changes are related to animal personalities. We subjected bank voles to partial nighttime illumination in a foraging landscape under laboratory conditions and in large grassland enclosures under near natural conditions. We measured giving-up density of food in illuminated and dark artificial seed patches and video recorded the movement of animals. While animals reduced number of visits to illuminated seed patches at night, they increased visits to these patches at the following day compared to dark seed patches. Overall, bold individuals had lower giving-up densities than shy individuals but this difference increased at day in formerly illuminated seed patches. Small mammals thus showed carry-over effects on daytime foraging behavior due to ALAN, i.e., nocturnal illumination has the potential to affect intra- and interspecific interactions during both night and day with possible changes in personality structure within populations and altered predator-prey dynamics.
Welfare beyond consumption
(2020)
In developed regions worldwide, so-called anti-consumers are increasingly resisting high-level consumption lifestyles or shifting to alternative forms of consumption. A general reduction in consumption levels is considered necessary to attain global sustainability goals. However, knowledge regarding the factors driving people to deliberately consume less and how anti-consumption affects individuals' well-being is limited. Against this background, this study considers the influence of human values and the well-being effects of two types of anti-consumption: voluntary simplicity and collaborative consumption. Based on representative data from the US (N = 1075) and Germany (N = 1070), the findings show that the two anti-consumption types do not reduce the well-being of individuals' but in some cases, even improve it, which suggests that lowering consumption can not only help protect environmental resources but also serve the greater good of society. In particular, this relationship holds among collaborative consumers with a strong need for cognition, i.e., a cognitive thinking style that involves a high level of decision control. According to the study results, opposite value orientations are the drivers of voluntary simplicity and collaborative consumption (i.e., a focus on self-transcendence versus self-enhancement). These findings are comparable in both countries; however, the strength of the effects differs.
Background
Subjective Social Status is used as an important predictor for psychological and physiological findings, most commonly measured with the MacArthur Scale (Ladder Test). Previous studies have shown that this test fits better in Western cultures. The idea of a social ladder itself and ranking oneself “higher” or “lower” is a concept that accords to the Western thinking.
Objectives
We hypothesize that in a culture where only the elites have adapted to a Western lifestyle, the test results reflect a higher level of accuracy for this stratum. We also expect that self-perception differs per sex.
Sample and Methods
We implemented the Ladder Test in a study of Indonesian schoolchildren aged between 5 and 13 years (boys N = 369, girls N= 364) from non-private and private schools in Kupang in 2020.
Results
Our analysis showed that the Ladder Test results were according to the Western expectations only for the private school, as the Ladder Scores significantly decreased with age (LM: p = 0.04). The Ladder Test results are best explained by “Education Father” for the non-private school pupils (p = 0.01) and all boys (p = 0.04), by “School Grades” for the private school cohort (p = 0.06) and by “Household Score” for girls (p =0.09).
Conclusion
This finding indicates that the concept of ranking oneself “high” or “low” on a social ladder is strongly implicated with Western ideas. A ladder implies social movement by “climbing” up or down. According to that, reflection of self-perception is influenced by culture.
What Colin Reynolds could tell us about nutrient limitation, N:P ratios and eutrophication control
(2020)
Colin Reynolds exquisitely consolidated our understanding of driving forces shaping phytoplankton communities and those setting the upper limit to biomass yield, with limitation typically shifting from light in winter to phosphorus in spring. Nonetheless, co-limitation is frequently postulated from enhanced growth responses to enrichments with both N and P or from N:P ranging around the Redfield ratio, concluding a need to reduce both N and P in order to mitigate eutrophication. Here, we review the current understanding of limitation through N and P and of co-limitation. We conclude that Reynolds is still correct: (i) Liebig's law of the minimum holds and reducing P is sufficient, provided concentrations achieved are low enough; (ii) analyses of nutrient limitation need to exclude evidently non-limiting situations, i.e. where soluble P exceeds 3-10 mu g/l, dissolved N exceeds 100-130 mu g/l and total P and N support high biomass levels with self-shading causing light limitation; (iii) additionally decreasing N to limiting concentrations may be useful in specific situations (e.g. shallow waterbodies with high internal P and pronounced denitrification); (iv) management decisions require local, situation-specific assessments. The value of research on stoichiometry and co-limitation lies in promoting our understanding of phytoplankton ecophysiology and community ecology.
What Colin Reynolds could tell us about nutrient limitation, N:P ratios and eutrophication control
(2020)
Colin Reynolds exquisitely consolidated our understanding of driving forces shaping phytoplankton communities and those setting the upper limit to biomass yield, with limitation typically shifting from light in winter to phosphorus in spring. Nonetheless, co-limitation is frequently postulated from enhanced growth responses to enrichments with both N and P or from N:P ranging around the Redfield ratio, concluding a need to reduce both N and P in order to mitigate eutrophication. Here, we review the current understanding of limitation through N and P and of co-limitation. We conclude that Reynolds is still correct: (i) Liebig's law of the minimum holds and reducing P is sufficient, provided concentrations achieved are low enough; (ii) analyses of nutrient limitation need to exclude evidently non-limiting situations, i.e. where soluble P exceeds 3-10 mu g/l, dissolved N exceeds 100-130 mu g/l and total P and N support high biomass levels with self-shading causing light limitation; (iii) additionally decreasing N to limiting concentrations may be useful in specific situations (e.g. shallow waterbodies with high internal P and pronounced denitrification); (iv) management decisions require local, situation-specific assessments. The value of research on stoichiometry and co-limitation lies in promoting our understanding of phytoplankton ecophysiology and community ecology.
What does stunting tell us?
(2023)
Stunting is commonly linked with undernutrition. Yet, already after World War I, German pediatricians questioned this link and stated that no association exists between nutrition and height. Recent analyses within different populations of Low- and middle-income countries with high rates of stunted children failed to support the assumption that stunted children have a low BMI and skinfold sickness as signs of severe caloric deficiency. So, stunting is not a synonym of malnutrition. Parental education level has a positive influence on body height in stunted populations, e.g., in India and in Indonesia. Socially disadvantaged children tend to be shorter and lighter than children from affluent families.
Humans are social mammals; they regulate growth similar to other social mammals. Also in humans, body height is strongly associated with the position within the social hierarchy, reflecting the personal and group-specific social, economic, political, and emotional environment. These non-nutritional impact factors on growth are summarized by the concept of SEPE (Social-Economic-Political-Emotional) factors. SEPE reflects on prestige, dominance-subordination, social identity, and ego motivation of individuals and social groups.
QuestionBelow-ground processes are key determinants of above-ground plant population and community dynamics. Still, our understanding of how environmental drivers shape plant communities is mostly based on above-ground diversity patterns, bypassing below-ground plant diversity stored in seed banks. As seed banks may shape above-ground plant communities, we question whether concurrently analysing the above- and below-ground species assemblages may potentially enhance our understanding of community responses to environmental variation. LocationTemperate deciduous forests along a 2000km latitudinal gradient in NW Europe. MethodsHerb layer, seed bank and local environmental data including soil pH, canopy cover, forest cover continuity and time since last canopy disturbance were collected in 129 temperate deciduous forest plots. We quantified herb layer and seed bank diversity per plot and evaluated how environmental variation structured community diversity in the herb layer, seed bank and the combined herb layer-seed bank community. ResultsSeed banks consistently held more plant species than the herb layer. How local plot diversity was partitioned across the herb layer and seed bank was mediated by environmental variation in drivers serving as proxies of light availability. The herb layer and seed bank contained an ever smaller and ever larger share of local diversity, respectively, as both canopy cover and time since last canopy disturbance decreased. Species richness and -diversity of the combined herb layer-seed bank community responded distinctly differently compared to the separate assemblages in response to environmental variation in, e.g. forest cover continuity and canopy cover. ConclusionsThe seed bank is a below-ground diversity reservoir of the herbaceous forest community, which interacts with the herb layer, although constrained by environmental variation in e.g. light availability. The herb layer and seed bank co-exist as a single community by means of the so-called storage effect, resulting in distinct responses to environmental variation not necessarily recorded in the individual herb layer or seed bank assemblages. Thus, concurrently analysing above- and below-ground diversity will improve our ecological understanding of how understorey plant communities respond to environmental variation.
Semi-natural habitats (SNHs) are becoming increasingly scarce in modern agricultural landscapes. This may reduce natural ecosystem services such as pest control with its putatively positive effect on crop production. In agreement with other studies, we recently reported wheat yield reductions at field borders which were linked to the type of SNH and the distance to the border. In this experimental landscape-wide study, we asked whether these yield losses have a biotic origin while analyzing fungal seed and fungal leaf pathogens, herbivory of cereal leaf beetles, and weed cover as hypothesized mediators between SNHs and yield. We established experimental winter wheat plots of a single variety within conventionally managed wheat fields at fixed distances either to a hedgerow or to an in-field kettle hole. For each plot, we recorded the fungal infection rate on seeds, fungal infection and herbivory rates on leaves, and weed cover. Using several generalized linear mixed-effects models as well as a structural equation model, we tested the effects of SNHs at a field scale (SNH type and distance to SNH) and at a landscape scale (percentage and diversity of SNHs within a 1000-m radius). In the dry year of 2016, we detected one putative biotic culprit: Weed cover was negatively associated with yield values at a 1-m and 5-m distance from the field border with a SNH. None of the fungal and insect pests, however, significantly affected yield, neither solely nor depending on type of or distance to a SNH. However, the pest groups themselves responded differently to SNH at the field scale and at the landscape scale. Our findings highlight that crop losses at field borders may be caused by biotic culprits; however, their negative impact seems weak and is putatively reduced by conventional farming practices.
Semi-natural habitats (SNHs) are becoming increasingly scarce in modern agricultural landscapes. This may reduce natural ecosystem services such as pest control with its putatively positive effect on crop production. In agreement with other studies, we recently reported wheat yield reductions at field borders which were linked to the type of SNH and the distance to the border. In this experimental landscape-wide study, we asked whether these yield losses have a biotic origin while analyzing fungal seed and fungal leaf pathogens, herbivory of cereal leaf beetles, and weed cover as hypothesized mediators between SNHs and yield. We established experimental winter wheat plots of a single variety within conventionally managed wheat fields at fixed distances either to a hedgerow or to an in-field kettle hole. For each plot, we recorded the fungal infection rate on seeds, fungal infection and herbivory rates on leaves, and weed cover. Using several generalized linear mixed-effects models as well as a structural equation model, we tested the effects of SNHs at a field scale (SNH type and distance to SNH) and at a landscape scale (percentage and diversity of SNHs within a 1000-m radius). In the dry year of 2016, we detected one putative biotic culprit: Weed cover was negatively associated with yield values at a 1-m and 5-m distance from the field border with a SNH. None of the fungal and insect pests, however, significantly affected yield, neither solely nor depending on type of or distance to a SNH. However, the pest groups themselves responded differently to SNH at the field scale and at the landscape scale. Our findings highlight that crop losses at field borders may be caused by biotic culprits; however, their negative impact seems weak and is putatively reduced by conventional farming practices.
During the last decade, intracellular actin waves have attracted much attention due to their essential role in various cellular functions, ranging from motility to cytokinesis. Experimental methods have advanced significantly and can capture the dynamics of actin waves over a large range of spatio-temporal scales. However, the corresponding coarse-grained theory mostly avoids the full complexity of this multi-scale phenomenon. In this perspective, we focus on a minimal continuum model of activator–inhibitor type and highlight the qualitative role of mass conservation, which is typically overlooked. Specifically, our interest is to connect between the mathematical mechanisms of pattern formation in the presence of a large-scale mode, due to mass conservation, and distinct behaviors of actin waves.