TY  - JOUR
A1  - Wolf, Thomas J. A.
A1  - Sanchez, David M.
A1  - Yang, J.
A1  - Parrish, R. M.
A1  - Nunes, J. P. F.
A1  - Centurion, M.
A1  - Coffee, R.
A1  - Cryan, J. P.
A1  - Gühr, Markus
A1  - Hegazy, Kareem
A1  - Kirrander, Adam
A1  - Li, R. K.
A1  - Ruddock, J.
A1  - Shen, Xiaozhe
A1  - Vecchione, T.
A1  - Weathersby, S. P.
A1  - Weber, Peter M.
A1  - Wilkin, K.
A1  - Yong, Haiwang
A1  - Zheng, Q.
A1  - Wang, X. J.
A1  - Minitti, Michael P.
A1  - Martinez, Todd J.
T1  - The photochemical ring-opening of 1,3-cyclohexadiene imaged by ultrafast electron diffraction
JF  - Nature chemistry
N2  - The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis. Although the relaxation from the photoexcited electronic state during the ring-opening has been investigated in numerous studies, the accompanying changes in atomic distance have not been resolved. Here we present a direct and unambiguous observation of the ring-opening reaction path on the femtosecond timescale and subangstrom length scale using megaelectronvolt ultrafast electron diffraction. We followed the carbon-carbon bond dissociation and the structural opening of the 1,3-cyclohexadiene ring by the direct measurement of time-dependent changes in the distribution of interatomic distances. We observed a substantial acceleration of the ring-opening motion after internal conversion to the ground state due to a steepening of the electronic potential gradient towards the product minima. The ring-opening motion transforms into rotation of the terminal ethylene groups in the photoproduct 1,3,5-hexatriene on the subpicosecond timescale.
KW  - Organic chemistry
KW  - Photochemistry
KW  - Physical chemistry
KW  - Theoretical chemistry
Y1  - 2019
U6  - https://doi.org/10.1038/s41557-019-0252-7
SN  - 1755-4330
SN  - 1755-4349
VL  - 11
IS  - 6
SP  - 504
EP  - 509
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Weber, Michael H.
A1  - Abu-Ayyash, Khalil
A1  - Abueladas, Abdel-Rahman
A1  - Agnon, Amotz
A1  - Al-Amoush, H.
A1  - Babeyko, Andrey
A1  - Bartov, Yosef
A1  - Baumann, M.
A1  - Ben-Avraham, Zvi
A1  - Bock, Günter
A1  - Bribach, Jens
A1  - El-Kelani, R.
A1  - Forster, A.
A1  - Förster, Hans-Jürgen
A1  - Frieslander, U.
A1  - Garfunkel, Zvi
A1  - Grunewald, Steffen
A1  - Gotze, Hans-Jürgen
A1  - Haak, Volker
A1  - Haberland, Christian
A1  - Hassouneh, Mohammed
A1  - Helwig, S.
A1  - Hofstetter, Alfons
A1  - Jackel, K. H.
A1  - Kesten, Dagmar
A1  - Kind, Rainer
A1  - Maercklin, Nils
A1  - Mechie, James
A1  - Mohsen, Amjad
A1  - Neubauer, F. M.
A1  - Oberhänsli, Roland
A1  - Qabbani, I.
A1  - Ritter, O.
A1  - Rumpker, G.
A1  - Rybakov, M.
A1  - Ryberg, Trond
A1  - Scherbaum, Frank
A1  - Schmidt, J.
A1  - Schulze, A.
A1  - Sobolev, Stephan Vladimir
A1  - Stiller, M.
A1  - Th, 
T1  - The crustal structure of the Dead Sea Transform
N2  - To address one of the central questions of plate tectonics-How do large transform systems work and what are their typical features?-seismic investigations across the Dead Sea Transform (DST), the boundary between the African and Arabian plates in the Middle East, were conducted for the first time. A major component of these investigations was a combined reflection/ refraction survey across the territories of Palestine, Israel and Jordan. The main results of this study are: (1) The seismic basement is offset by 3-5 km under the DST, (2) The DST cuts through the entire crust, broadening in the lower crust, (3) Strong lower crustal reflectors are imaged only on one side of the DST, (4) The seismic velocity sections show a steady increase in the depth of the crust-mantle transition (Moho) from 26 km at the Mediterranean to 39 km under the Jordan highlands, with only a small but visible, asymmetric topography of the Moho under the DST. These observations can be linked to the left-lateral movement of 105 km of the two plates in the last 17 Myr, accompanied by strong deformation within a narrow zone cutting through the entire crust. Comparing the DST and the San Andreas Fault (SAF) system, a strong asymmetry in subhorizontal lower crustal reflectors and a deep reaching deformation zone both occur around the DST and the SAF. The fact that such lower crustal reflectors and deep deformation zones are observed in such different transform systems suggests that these structures are possibly fundamental features of large transform plate boundaries
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Cheng, Shifeng
A1  - van den Bergh, Erik
A1  - Zeng, Peng
A1  - Zhong, Xiao
A1  - Xu, Jiajia
A1  - Liu, Xin
A1  - Hofberger, Johannes
A1  - de Bruijn, Suzanne
A1  - Bhide, Amey S.
A1  - Kuelahoglu, Canan
A1  - Bian, Chao
A1  - Chen, Jing
A1  - Fan, Guangyi
A1  - Kaufmann, Kerstin
A1  - Hall, Jocelyn C.
A1  - Becker, Annette
A1  - Bräutigam, Andrea
A1  - Weber, Andreas P. M.
A1  - Shi, Chengcheng
A1  - Zheng, Zhijun
A1  - Li, Wujiao
A1  - Lv, Mingju
A1  - Tao, Yimin
A1  - Wang, Junyi
A1  - Zou, Hongfeng
A1  - Quan, Zhiwu
A1  - Hibberd, Julian M.
A1  - Zhang, Gengyun
A1  - Zhu, Xin-Guang
A1  - Xu, Xun
A1  - Schranz, M. Eric
T1  - The Tarenaya hassleriana Genome Provides insight Into Reproductive Trait and Genome Evolution of Crucifers
JF  - The plant cell
N2  - The Brassicaceae, including Arabidopsis thaliana and Brassica crops, is unmatched among plants in its wealth of genomic and functional molecular data and has long served as a model for understanding gene, genome, and trait evolution. However, genome information from a phylogenetic outgroup that is essential for inferring directionality of evolutionary change has been lacking. We therefore sequenced the genome of the spider flower (Tarenaya hassleriana) from the Brassicaceae sister family, the Cleomaceae. By comparative analysis of the two lineages, we show that genome evolution following ancient polyploidy and gene duplication events affect reproductively important traits. We found an ancient genome triplication in Tarenaya (Th-alpha) that is independent of the Brassicaceae-specific duplication (At-alpha) and nested Brassica (Br-a) triplication. To showcase the potential of sister lineage genome analysis, we investigated the state of floral developmental genes and show Brassica retains twice as many floral MADS (for MINICHROMOSOME MAINTENANCE1, AGAMOUS, DEFICIENS and SERUM RESPONSE FACTOR) genes as Tarenaya that likely contribute to morphological diversity in Brassica. We also performed synteny analysis of gene families that confer self-incompatibility in Brassicaceae and found that the critical SERINE RECEPTOR KINASE receptor gene is derived from a lineage-specific tandem duplication. The T. hassleriana genome will facilitate future research toward elucidating the evolutionary history of Brassicaceae genomes.
Y1  - 2013
U6  - https://doi.org/10.1105/tpc.113.113480
SN  - 1040-4651
VL  - 25
IS  - 8
SP  - 2813
EP  - 2830
PB  - American Society of Plant Physiologists
CY  - Rockville
ER  - 
TY  - GEN
A1  - Schernthaner, G.
A1  - Groop, P.
A1  - Cooper, M.
A1  - Perkovic, V
A1  - Hocher, Berthold
A1  - Kanasaki, K.
A1  - Sharma, K.
A1  - Stanton, R.
A1  - Toto, R.
A1  - Cescutti, Jessica
A1  - Gordat, M.
A1  - Meinicke, T.
A1  - Koitka-Weber, A.
A1  - Woerle, H.
A1  - Eynatten, M.
T1  - EFFECTS OF LINAGLIPTIN ON GLYCAEMIC CONTROL AND ALBUMINURIA IN TYPE 2
DIABETES - THE MARLINA-T2D (TM) TRIAL
T2  - Nephrology
Y1  - 2016
U6  - https://doi.org/10.1111/nep.12887
SN  - 1320-5358
SN  - 1440-1797
VL  - 21
SP  - 60
EP  - 60
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Yu, Tien-Shin
A1  - Kofler, Heike
A1  - Häusler, Rainer E.
A1  - Hille, Diana
A1  - Flügge, Ulf-Ingo
A1  - Zeeman, Samuel C.
A1  - Smith, Alison M.
A1  - Kossmann, Jens
A1  - Lloyd, James R.
A1  - Ritte, Gerhard
A1  - Steup, Martin
A1  - Lue, Wei-Ling
A1  - Chen, Jychian
A1  - Weber, Andreas P. M.
T1  - The Arabidopsis sex1 mutant is defective in the R1 protein, a general regulator of starch degradation in plants, and not in the chloroplast hexose transporter
Y1  - 2001
SN  - 1040-4651
ER  - 
TY  - JOUR
A1  - Weber, Marion
A1  - Cardona, A.
A1  - Valencia, V.
A1  - Altenberger, Uwe
A1  - Lopez-Martinez, M.
A1  - Tobon, M.
A1  - Zapata, Sebastian Henao
A1  - Zapata, G.
A1  - Concha, A. E.
T1  - Geochemistry and geochronology of the Guajira Eclogites, northern Colombia evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc
JF  - Geologica acta
N2  - The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE patterns, suggesting that their protoliths evolved in a subduction related tectonic setting. They show island-arc affinities and are similar to primitive island-arc rocks described in the Caribbean. The geochemical characteristics are comparable to low-grade greenschists from the nearby Etpana Terrane, which are interpreted as part of a Cretaceous intra-oceanic arc. These data support evidence that the eclogites and the Etpana terrane rocks formed from the same volcano-sedimentary sequence. Part of this sequence was accreted onto the margin and another was incorporated into the subduction channel and metamorphosed at eclogite facies conditions. Ar-40-Ar-39 ages of 79.2 +/- 1.1Ma and 82.2 +/- 2.5Ma determined on white micas, separated from two eclogite samples, are interpreted to be related to the cooling of the main metamorphic event. The formation of a common volcano-sedimentary protolith and subsequent metamorphism of these units record the ongoing Late Cretaceous continental subduction of the South American margin within the Caribbean intra-oceanic arc subduction zone. This gave way to an arc-continent collision between the Caribbean and the South American plates, where this sequence was exhumed after the Campanian.
KW  - Eclogites
KW  - Primitive island-arc
KW  - Geochronology
KW  - Guajira Peninsula
KW  - Colombia
KW  - Caribbean
Y1  - 2011
U6  - https://doi.org/10.1344/105.000001740
SN  - 1695-6133
VL  - 9
IS  - 3-4
SP  - 425
EP  - 443
PB  - Facultat de Geologia, Divisio III, Ciències Experimentals i Matemàtiques, Universitat de Barcelona
CY  - Barcelona
ER  - 
TY  - JOUR
A1  - Jousset, Philippe
A1  - Reinsch, Thomas
A1  - Ryberg, Trond
A1  - Blanck, Hanna
A1  - Clarke, Andy
A1  - Aghayev, Rufat
A1  - Hersir, Gylfi P.
A1  - Henninges, Jan
A1  - Weber, Michael
A1  - Krawczyk, Charlotte M.
T1  - Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features
JF  - Nature Communications
N2  - Natural hazard prediction and efficient crust exploration require dense seismic observations both in time and space. Seismological techniques provide ground-motion data, whose accuracy depends on sensor characteristics and spatial distribution. Here we demonstrate that dynamic strain determination is possible with conventional fibre-optic cables deployed for telecommunication. Extending recently distributed acoustic sensing (DAS) studies, we present high resolution spatially un-aliased broadband strain data. We recorded seismic signals from natural and man-made sources with 4-m spacing along a 15-km-long fibre-optic cable layout on Reykjanes Peninsula, SW-Iceland. We identify with unprecedented resolution structural features such as normal faults and volcanic dykes in the Reykjanes Oblique Rift, allowing us to infer new dynamic fault processes. Conventional seismometer recordings, acquired simultaneously, validate the spectral amplitude DAS response between 0.1 and 100 Hz bandwidth. We suggest that the networks of fibre-optic telecommunication lines worldwide could be used as seismometers opening a new window for Earth hazard assessment and exploration.
Y1  - 2018
U6  - https://doi.org/10.1038/s41467-018-04860-y
SN  - 2041-1723
VL  - 9
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Barbier, Guillaume
A1  - Oesterhelt, Christine
A1  - Larson, Matthew D.
A1  - Halgren, Robert G.
A1  - Wilkerson, Curtis
A1  - Garavito, Michael R.
A1  - Benning, Christoph
A1  - Weber, Andreas P. M.
T1  - Comparative genomics of two closely related unicellular thermo-acidophilic red algae, Galdieria sulphuraria and Cyanidioschyzon merolae, reveals the molecular basis of the metabolic flexibility of Galdieria sulphuraria and sigant differences in carbohydrate metabolism of both algae
N2  - Unicellular algae serve as models for the study and discovery of metabolic pathways, for the functional dissection of cell biological processes such as organellar division and cell motility, and for the identification of novel genes and gene functions. The recent completion of several algal genome sequences and expressed sequence tag collections and the establishment of nuclear and organellar transformation methods has opened the way for functional genomics approaches using algal model systems. The thermo-acidophilic unicellular red alga Galdieria sulphuraria represents a particularly interesting species for a genomics approach owing to its extraordinary metabolic versatility such as heterotrophic and mixotrophic growth on more than 50 different carbon sources and its adaptation to hot acidic environments. However, the ab initio prediction of genes required for unknown metabolic pathways from genome sequences is not trivial. A compelling strategy for gene identification is the comparison of similarly sized genomes of related organisms with different physiologies. Using this approach, candidate genes were identified that are critical to the metabolic versatility of Galdieria. Expressed sequence tags and high-throughput genomic sequence reads covering >70% of the G. sulphuraria genome were compared to the genome of the unicellular, obligate photoautotrophic red alga Cyanidioschyzon merolae. More than 30% of the Galdieria sequences did not relate to any of the Cyandioschyzon genes. A closer inspection of these sequences revealed a large number of membrane transporters and enzymes of carbohydrate metabolism that are unique to Galdieria. Based on these data, it is proposed that genes involved in the uptake of reduced carbon compounds and enzymes involved in their metabolism are crucial to the metabolic flexibility of G. sulphuraria
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Weber, Andreas P. M.
A1  - Oesterhelt, Christine
A1  - Gross, Wolfgang
A1  - Bräutigam, Andrea
A1  - Imboden, Lori
A1  - Krassovskaya, Inga
A1  - Linka, Nicole
A1  - Truchina, Julia
A1  - Schneidereit, Jörg
A1  - Voll, Lars
A1  - Zimmermann, Marc
A1  - Jamai, Aziz
A1  - Riekhof, Wayne
A1  - Yu, Bin
A1  - Garavito, Michael R.
A1  - Benning, Christoph
T1  - EST-analysis of the thermo-acidophilic red microalga Galdieria sulphuraria reveals potential for lipid A biosynthesis and unveils the pathway of carbon export from rhodoplasts
N2  - When we think of extremophiles, organisms adapted to extreme environments, prokaryotes come to mind first. However, the unicellular red micro-alga Galdieria sulphuraria (Cyanidiales) is a eukaryote that can represent up to 90% of the biomass in extreme habitats such as hot sulfur springs with pH values of 0-4 and temperatures of up to 56 degreesC. This red alga thrives autotrophically as well as heterotrophically on more than 50 different carbon sources, including a number of rare sugars and sugar alcohols. This biochemical versatility suggests a large repertoire of metabolic enzymes, rivaled by few organisms and a potentially rich source of thermo-stable enzymes for biotechnology. The temperatures under which this organism carries out photosynthesis are at the high end of the range for this process, making G. sulphuraria a valuable model for physical studies on the photosynthetic apparatus. In addition, the gene sequences of this living fossil reveal much about the evolution of modern eukaryotes. Finally, the alga tolerates high concentrations of toxic metal ions such as cadmium, mercury, aluminum, and nickel, suggesting potential application in bioremediation. To begin to explore the unique biology of G. sulphuraria, 5270 expressed sequence tags from two different cDNA libraries have been sequenced and annotated. Particular emphasis has been placed on the reconstruction of metabolic pathways present in this organism. For example, we provide evidence for (i) a complete pathway for lipid A biosynthesis; (ii) export of triose-phosphates from rhodoplasts; (iii) and absence of eukaryotic hexokinases. Sequence data and additional information are available at http://genomics.msu.edu/galdieria
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Villatoro, José Andrés
A1  - Weber, M.
A1  - Zühlke, Martin
A1  - Lehmann, A.
A1  - Zenichowski, Karl
A1  - Riebe, Daniel
A1  - Beitz, Toralf
A1  - Löhmannsröben, Hans-Gerd
A1  - Kreuzer, O.
T1  - Structural characterization of synthetic peptides using electrospray ion mobility spectrometry and molecular dynamics simulations
JF  - International Journal of Mass Spectrometry
N2  - Electrospray ionization-ion mobility spectrometry was employed for the determination of collision cross sections (CCS) of 25 synthetically produced peptides in the mass range between 540-3310 Da. The experimental measurement of the CCS is complemented by their calculation applying two different methods. One prediction method is the intrinsic size parameter (ISP) method developed by the Clemmer group. The second new method is based on the evaluation of molecular dynamics (MD) simulation trajectories as a whole, resulting in a single, averaged collision cross-section value for a given peptide in the gas phase. A high temperature MD simulation is run in order to scan through the whole conformational space. The lower temperature conformational distribution is obtained through thermodynamic reweighting. In the first part, various correlations, e.g. CCS vs. mass and inverse mobility vs. m/z correlations, are presented. Differences in CCS between peptides are also discussed in terms of their respective mass and m/z differences, as well as their respective structures. In the second part, measured and calculated CCS are compared. The agreement between the prediction results and the experimental values is in the same range for both calculation methods. While the calculation effort of the ISP method is much lower, the MD method comprises several tools providing deeper insights into the conformations of peptides. Advantages and limitations of both methods are discussed. Based on the separation of two pairs of linear and cyclic peptides of virtually the same mass, the influence of the structure on the cross sections is discussed. The shift in cross section differences and peak shape after transition from the linear to the cyclic peptide can be well understood by applying different MD tools, e.g. the root-mean-square deviation (RMSD) and the root mean square fluctuation (RMSF). (C) 2018 Elsevier B.V. All rights reserved.
KW  - Ion mobility spectrometry
KW  - Electrospray ionization
KW  - Peptides
KW  - Collision cross-section
KW  - Molecular dynamics
Y1  - 2019
U6  - https://doi.org/10.1016/j.ijms.2018.10.036
SN  - 1387-3806
SN  - 1873-2798
VL  - 436
SP  - 108
EP  - 117
PB  - Elsevier
CY  - Amsterdam
ER  -