TY  - JOUR
A1  - Meckelmann, Viola
A1  - Pfeifer, Caroline
A1  - Rauh, Hellgard
T1  - Family relationships in childhood, pubertal timing, and subsequent reproductive strategies among adolescents
JF  - South African journal of psychology
N2  - The evolutionary theory of socialization of Belsky, Steinberg, and Draper was investigated on the empirical basis of a longitudinal sample of 26 adolescent girls and boys who were born in Berlin during German reunification, as well as their mothers. Consistent with the theory, pubertal timing of the girls (but not of the boys) was predicted by the quality of parental relations in childhood, and pubertal timing of the girls (but not of the boys) was a significant predictor of the age at first intercourse. The results suggest that there are different developmental pathways for girls and boys with respect to the predictions of the evolutionary theory of socialization of Belsky et al. The findings also support the hypothesis that early onset of reproduction and frequent reproduction may be two different aspects of a quantitative reproductive strategy.
KW  - Adolescence
KW  - childhood
KW  - family relations
KW  - pubertal timing
KW  - puberty
KW  - reproductive strategies
Y1  - 2013
U6  - https://doi.org/10.1177/0081246312474408
SN  - 0081-2463
VL  - 43
IS  - 1
SP  - 22
EP  - 33
PB  - Sage Publ.
CY  - London
ER  - 
TY  - JOUR
A1  - Westendorf, Christian
A1  - Negrete, Jose
A1  - Bae, Albert J.
A1  - Sandmann, Rabea
A1  - Bodenschatz, Eberhard
A1  - Beta, Carsten
T1  - Actin cytoskeleton of chemotactic amoebae operates close to the onset of oscillations
JF  - Proceedings of the National Academy of Sciences of the United States of America
N2  - The rapid reorganization of the actin cytoskeleton in response to external stimuli is an essential property of many motile eukaryotic cells. Here, we report evidence that the actin machinery of chemotactic Dictyostelium cells operates close to an oscillatory instability. When averaging the actin response of many cells to a short pulse of the chemoattractant cAMP, we observed a transient accumulation of cortical actin reminiscent of a damped oscillation. At the single-cell level, however, the response dynamics ranged from short, strongly damped responses to slowly decaying, weakly damped oscillations. Furthermore, in a small subpopulation, we observed self-sustained oscillations in the cortical F-actin concentration. To substantiate that an oscillatory mechanism governs the actin dynamics in these cells, we systematically exposed a large number of cells to periodic pulse trains of different frequencies. Our results indicate a resonance peak at a stimulation period of around 20 s. We propose a delayed feedback model that explains our experimental findings based on a time-delay in the regulatory network of the actin system. To test the model, we performed stimulation experiments with cells that express GFP-tagged fusion proteins of Coronin and actin-interacting protein 1, as well as knockout mutants that lack Coronin and actin-interacting protein 1. These actin-binding proteins enhance the disassembly of actin filaments and thus allow us to estimate the delay time in the regulatory feedback loop. Based on this independent estimate, our model predicts an intrinsic period of 20 s, which agrees with the resonance observed in our periodic stimulation experiments.
KW  - Dictyostelium discoideum
KW  - microfluidics
KW  - caged cAMP
KW  - delay-differential equation
Y1  - 2013
U6  - https://doi.org/10.1073/pnas.1216629110
SN  - 0027-8424
VL  - 110
IS  - 10
SP  - 3853
EP  - 3858
PB  - National Acad. of Sciences
CY  - Washington
ER  - 
TY  - JOUR
A1  - Harma, Harri
A1  - Pihlasalo, Sari
A1  - Cywinski, Piotr J.
A1  - Mikkonen, Piia
A1  - Hammann, Tommy
A1  - Löhmannsröben, Hans-Gerd
A1  - Hanninen, Pekka
T1  - Protein quantification using resonance energy transfer between donor nanoparticles and acceptor quantum dots
JF  - Analytical chemistry
N2  - A homogeneous time-resolved luminescence resonance energy transfer (TR-LRET) assay has been developed to quantify proteins. The competitive assay is based on resonance energy transfer (RET) between two luminescent nanosized particles. Polystyrene nanoparticles loaded with Eu3+ chelates (EuNPs) act as donors, while protein-coated quantum dots (QDs), either CdSe/ZnS emitting at 655 nm (QD655-strep) or CdSeTe/ZnS with emission wavelength at 705 nm (QD705-strep), are acceptors. In the absence of analyte protein, in our case bovine serum albumin (BSA), the protein-coated QDs bind nonspecifically to the EuNPs, leading to RET. In the presence of analyte proteins, the binding of the QDs to the EuNPs is prevented and the RET signal decreases. RET from the EuNPs to the QDs was confirmed and characterized with steady-state and time-resolved luminescence spectroscopy. In accordance with the Forster theory, the approximate average donor acceptor distance is around 15 nm at RET efficiencies, equal to 15% for QD655 and 13% for QD705 acceptor, respectively. The limits of detection are below 10 ng of BSA with less than a 10% average coefficient of variation. The assay sensitivity is improved, when compared to the most sensitive commercial methods. The presented mix-and-measure method has potential to be implemented into routine protein quantification in biological laboratories.
Y1  - 2013
U6  - https://doi.org/10.1021/ac303586n
SN  - 0003-2700
VL  - 85
IS  - 5
SP  - 2921
EP  - 2926
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Julich-Gruner, Konstanze K.
A1  - Löwenberg, Candy
A1  - Neffe, Axel T.
A1  - Behl, Marc
A1  - Lendlein, Andreas
T1  - Recent trends in the chemistry of shape-memory polymers
JF  - Macromolecular chemistry and physics
N2  - Shape-memory polymers (SMPs) are stimuli-sensitive materials capable of performing complex movements on demand, which makes them interesting candidates for various applications, for example, in biomedicine or aerospace. This trend article highlights current approaches in the chemistry of SMPs, such as tailored segment chemistry to integrate additional functions and novel synthetic routes toward permanent and temporary netpoints. Multiphase polymer networks and multimaterial systems illustrate that SMPs can be constructed as a modular system of different building blocks and netpoints. Future developments are aiming at multifunctional and multistimuli-sensitive SMPs.
KW  - multifunctional polymers
KW  - networks
KW  - shape-memory polymers
KW  - stimuli-sensitive polymers
KW  - triple-shape effect
Y1  - 2013
U6  - https://doi.org/10.1002/macp.201200607
SN  - 1022-1352
VL  - 214
IS  - 5
SP  - 527
EP  - 536
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Beye, Martin
A1  - Föhlisch, Alexander
T1  - Soft X-ray probes of ultrafast dynamics for heterogeneous catalysis
JF  - Chemical physics : a journal devoted to experimental and theoretical research involving problems of both a chemical and physical nature
N2  - Soft X-ray spectroscopy is one of the best tools to directly address the electronic structure, the driving force of chemical reactions. It enables selective studies on sample surfaces to single out reaction centers in heterogeneous catalytic reactions. With core-hole clock methods, specific dynamics are related to the femtosecond life time of a core-hole. Typically, this method is used with photoemission spectroscopy, but advancements in soft X-ray emission techniques render more specific studies possible. With the advent of bright femtosecond pulsed soft X-ray sources, highly selective pump-probe X-ray emission studies are enabled with temporal resolutions down to tens of femtoseconds. This finally allows to study dynamics in the electronic structure of adsorbed reaction centers on the whole range of relevant time scales - closing the gap between kinetic soft X-ray studies and the atto- to femtosecond core-hole clock techniques.
KW  - Core-hole clock
KW  - Resonant inelastic X-ray scattering
KW  - Ultrafast surface science
KW  - Photoelectron spectroscopy
Y1  - 2013
U6  - https://doi.org/10.1016/j.chemphys.2012.03.023
SN  - 0301-0104
SN  - 1873-4421
VL  - 414
IS  - 5
SP  - 130
EP  - 138
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Jechow, Andreas
A1  - Norton, B. G.
A1  - Händel, S.
A1  - Blums, V.
A1  - Streed, E. W.
A1  - Kielpinski, D.
T1  - Controllable optical phase shift over one radian from a single isolated atom
JF  - Physical review letters
N2  - Fundamental optics such as lenses and prisms work by applying phase shifts of several radians to incoming light, and rapid control of such phase shifts is crucial to telecommunications. However, large, controllable optical phase shifts have remained elusive for isolated quantum systems. We have used a single trapped atomic ion to induce and measure a large optical phase shift of 1.3 +/- 0.1 radians in light scattered by the atom. Spatial interferometry between the scattered light and unscattered illumination light enables us to isolate the phase shift in the scattered component. The phase shift achieves the maximum value allowed by atomic theory over the accessible range of laser frequencies, pointing out new opportunities in microscopy and nanophotonics. Single-atom phase shifts of this magnitude open up new quantum information protocols, in particular long-range quantum phase-shift-keying cryptography. DOI: 10.1103/PhysRevLett.110.113605
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevLett.110.113605
SN  - 0031-9007
VL  - 110
IS  - 11
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Osterloh, Lukas
A1  - Böckmann, Christine
A1  - Nicolae, Doina
A1  - Nemuc, Anca
T1  - Regularized inversion of microphysical atmospheric particle parameters -  theory and application
JF  - Journal of computational physics
N2  - Retrieving the distribution of aerosols in the atmosphere via remote sensing techniques is a highly complex task that requires dealing with a wide range of different problems stemming both from Physics and Mathematics. We focus on retrieving this distribution from multi-wavelength lidar data for aerosol ensembles consisting of spherical particles via an iterative regularization technique. The optical efficiencies for spherical scatterers are examined to account for the behavior of the underlying integral equation. The ill-posedness of the problem and the conditioning of the discretized problem are analyzed. Some critical points in the model, like the assumed wavelength-independence of the refractive index and the fixed grid of investigated refractive indices, are studied with regard to their expected impact on the regularized solution. A new Monte-Carlo type method is proposed for retrieval of the refractive index. To validate the results, the developed algorithm is applied to two measurement cases of burning biomass gained from multi-wavelength Raman lidar.
KW  - Inverse ill-posed problem
KW  - Regularization
KW  - Lidar remote sensing
KW  - Microphysical particle properties
Y1  - 2013
U6  - https://doi.org/10.1016/j.jcp.2012.11.040
SN  - 0021-9991
VL  - 237
IS  - 11
SP  - 79
EP  - 94
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Lemke, Karina
A1  - Prietzel, Claudia Christina
A1  - Koetz, Joachim
T1  - Fluorescent gold clusters synthesized in a poly(ethyleneimine) modified reverse microemulsion
JF  - Journal of colloid and interface science
N2  - This paper is focused on the formation of gold clusters in a tailor-made polyelectrolyte-modified reverse microemulsion using poly(ethyleneimine) (PEI) as a cationic polyelectrolyte. PEI incorporated into a ternary w/o microemulsion consisting of water/heptanol/zwitterionic surfactant 3-(N,N-dimethyl-dodecylammonio)-propanesulfonate (SB) acts as a reducing and stabilizing agent and shows an additional template effect. The nanoparticle synthesis is performed by a simple mixing of two microemulsions, one containing the PEI and the other one containing the gold chloride precursor. UV-vis measurements in the microemulsion show two pronounced absorption maxima, one at 360 nm and the other one at 520 nm, indicating two particle fractions. The absorption maximum at 360 nm in combination to the unique fluorescence properties indicate the formation of gold clusters. After a complete solvent evaporation the redispersed nanoparticles have been characterized by using UV-vis and fluorescence spectroscopy, in combination to dynamic light scattering and transmission electron microscopy (TEM). In addition to the gold nanoparticle fraction (>5 nm) the fluorescent gold cluster fraction (<2 nm) can be redispersed without particle aggregation. By means of asymmetric flow field flow fractionation (AF-FFF) two different cluster fractions with particle diameter (<2 nm) can be identified.
KW  - Microemulsion
KW  - Gold cluster
KW  - Field flow fractionation
KW  - Polymer capped gold nanoparticles
Y1  - 2013
U6  - https://doi.org/10.1016/j.jcis.2012.11.057
SN  - 0021-9797
VL  - 394
SP  - 141
EP  - 146
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Dell'Angela, M.
A1  - Anniyev, Toyli
A1  - Beye, Martin
A1  - Coffee, Ryan
A1  - Föhlisch, Alexander
A1  - Gladh, J.
A1  - Katayama, T.
A1  - Kaya, S.
A1  - Krupin, O.
A1  - LaRue, J.
A1  - Mogelhoj, A.
A1  - Nordlund, D.
A1  - Norskov, J. K.
A1  - Oberg, H.
A1  - Ogasawara, H.
A1  - Ostrom, H.
A1  - Pettersson, Lars G. M.
A1  - Schlotter, W. F.
A1  - Sellberg, J. A.
A1  - Sorgenfrei, Nomi
A1  - Turner, J. J.
A1  - Wolf, M.
A1  - Wurth, W.
A1  - Nilsson, A.
T1  - Real-time observation of surface bond breaking with an X-ray Laser
JF  - Science
N2  - We used the Linac Coherent Light Source free-electron x-ray laser to probe the electronic structure of CO molecules as their chemisorption state on Ru(0001) changes upon exciting the substrate by using a femtosecond optical laser pulse. We observed electronic structure changes that are consistent with a weakening of the CO interaction with the substrate but without notable desorption. A large fraction of the molecules (30%) was trapped in a transient precursor state that would precede desorption. We calculated the free energy of the molecule as a function of the desorption reaction coordinate using density functional theory, including van der Waals interactions. Two distinct adsorption wells-chemisorbed and precursor state separated by an entropy barrier-explain the anomalously high prefactors often observed in desorption of molecules from metals.
Y1  - 2013
U6  - https://doi.org/10.1126/science.1231711
SN  - 0036-8075
VL  - 339
IS  - 6125
SP  - 1302
EP  - 1305
PB  - American Assoc. for the Advancement of Science
CY  - Washington
ER  - 
TY  - JOUR
A1  - Kleinpeter, Erich
A1  - Werner, Peter
A1  - Koch, Andreas
T1  - Push-pull allenes-conjugation, (anti)aromaticity and quantification of the push-pull character
JF  - Tetrahedron
N2  - Structures, H-1/C-13 chemical shifts, and pi electron distribution/conjugation of an experimentally available and theoretically completed set of push-pull allenes Acc(2)C=C=CDon(2) (Acc=F, CHO, CF3, C  N; Don=t-Bu, OMe, OEt, SMe, SEt, NCH2R) have been computed at the OFT level of theory. Both orthogonal linear and orthogonal bent structures have been obtained. In the latter case the push-pull character could be quantified by the quotient method. The C-13 chemical shift of the central allene carbon atom C-2 and chemical shift differences Delta delta(C-1, C-2) and Delta delta(C-2, C-3) of allene carbon atoms proved to be a quantitative alternative. TSNMRS of ring-closed push-pull allenes have been computed in addition and were employed to identify polar, carbene-like and carbone-like canonical structures of these molecules.
KW  - Push-pull allenes
KW  - Push-pull character
KW  - C-13 NMR spectroscopy
KW  - Quotient method
KW  - TSNMRS
KW  - ICSS
KW  - Aromaticity
Y1  - 2013
U6  - https://doi.org/10.1016/j.tet.2013.01.027
SN  - 0040-4020
VL  - 69
IS  - 11
SP  - 2436
EP  - 2445
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Pohl, Martin
A1  - Eichler, David
T1  - Understanding TeV-band cosmic-ray anistropy
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - We investigate the temporal and spectral correlations between flux and anisotropy fluctuations of TeV-band cosmic rays in light of recent data taken with IceCube. We find that for a conventional distribution of cosmic-ray sources, the dipole anisotropy is higher than observed, even if source discreteness is taken into account. Moreover, even for a shallow distribution of galactic cosmic-ray sources and a reacceleration model, fluctuations arising from source discreteness provide a probability only of the order of 10% that the cosmic-ray anisotropy limits of the recent IceCube analysis are met. This probability estimate is nearly independent of the exact choice of source rate, but generous for a large halo size. The location of the intensity maximum far from the Galactic Center is naturally reproduced.
KW  - cosmic rays
Y1  - 2013
U6  - https://doi.org/10.1088/0004-637X/766/1/4
SN  - 0004-637X
VL  - 766
IS  - 1
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Taft, Linda
A1  - Wiechert, Uwe
A1  - Zhang, Hucai
A1  - Lei, Guoliang
A1  - Mischke, Steffen
A1  - Plessen, Birgit
A1  - Weynell, Marc
A1  - Winkler, Andreas
A1  - Riedel, Frank
T1  - Oxygen and carbon isotope patterns archived in shells of the aquatic gastropod Radix - hydrologic and climatic signals across the Tibetan Plateau in sub-monthly resolution
JF  - Quaternary international : the journal of the International Union for Quaternary Research
N2  - The Tibetan Plateau (TP), including its surrounding mountain ranges, represents the largest store of ice outside the polar regions. It hosts numerous lakes as well as the head waters of major Asian rivers, on which billions of people depend, and it is particularly sensitive to climate change. The moisture transport to the TP is controlled by the Indian and Pacific monsoon and the Westerlies. Understanding the evolution of the interaction of these circulation systems requires studies on climate archives in different spatial and temporal contexts. The objective of this study is to learn more about the interannual variability of precipitation patterns across the TP and how different hydrologic systems react to different climatic factors.
 Aragonite shells of the aquatic gastropod Radix, which is widely distributed in the region, may represent suitable archives for inferring hydrologic and climatic signals in particularly high resolution. Therefore, sclerochronological studies of delta O-18 and delta C-13 ratios in Radix shells from seven lakes were conducted, each representing a different hydrologic and climatic setting, on a transect from the Pamirs across the TP.
 The shell patterns exhibit an increasing influence of precipitation and a decreasing influence of evaporation on the isotope compositions from west to east. delta O-18 values of shells from lakes on the eastern and central TP (Donggi Cona, Yamdrok Yumco, Tarab Co) mirror monsoon signals, indicated by more negative values and higher variabilities compared to the more western lakes (Karakul, Bangong/Nyak, Manasarovar). In Yadang Co, located on the central southern TP, the monsoon rains did not reach the lake in the sampling year, although it is located in a region which is usually affected by monsoon circulation. The delta O-18 values are used to differentiate the annual hydrological cycle into ice cover period, melt water period, precipitation period and evaporation period. delta C-13 compositions in the shells particularly depend on specific habitats, which vary in biological productivity and in carbon sources. delta O-18 and delta C-13 patterns show a positive covariance in shells originating from large closed basins. The results show that Radix shells mirror general climatic differences between the seven lake regions. These differences reflect both regional and local climate signals in sub-seasonal resolution, without noticeable dependence on the particular lake system.
Y1  - 2013
U6  - https://doi.org/10.1016/j.quaint.2012.10.031
SN  - 1040-6182
VL  - 290
IS  - 1
SP  - 282
EP  - 298
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Blomeyer, Dorothea
A1  - Buchmann, Arlette F.
A1  - Lascorz, Jesus
A1  - Zimmermann, Ulrich S.
A1  - Esser, Günter
A1  - Desrivieres, Sylvane
A1  - Schmidt, Martin H.
A1  - Banaschewski, Tobias
A1  - Schumann, Gunter
A1  - Laucht, Manfred
T1  - Association of PER2 genotype and stressful life events with alcohol drinking in young adults
JF  - PLoS one
N2  - Background: Clock genes govern circadian rhythms and shape the effect of alcohol use on the physiological system. Exposure to severe negative life events is related to both heavy drinking and disturbed circadian rhythmicity. The aim of this study was 1) to extend previous findings suggesting an association of a haplotype tagging single nucleotide polymorphism of PER2 gene with drinking patterns, and 2) to examine a possible role for an interaction of this gene with life stress in hazardous drinking.
 Methods: Data were collected as part of an epidemiological cohort study on the outcome of early risk factors followed since birth. At age 19 years, 268 young adults (126 males, 142 females) were genotyped for PER2 rs56013859 and were administered a 45-day alcohol timeline follow-back interview and the Alcohol Use Disorders Identification Test (AUDIT). Life stress was assessed as the number of severe negative life events during the past four years reported in a questionnaire and validated by interview.
 Results: Individuals with the minor G allele of rs56013859 were found to be less engaged in alcohol use, drinking at only 72% of the days compared to homozygotes for the major A allele. Moreover, among regular drinkers, a gene x environment interaction emerged (p = .020). While no effects of genotype appeared under conditions of low stress, carriers of the G allele exhibited less hazardous drinking than those homozygous for the A allele when exposed to high stress.
 Conclusions: These findings may suggest a role of the circadian rhythm gene PER2 in both the drinking patterns of young adults and in moderating the impact of severe life stress on hazardous drinking in experienced alcohol users. However, in light of the likely burden of multiple tests, the nature of the measures used and the nominal evidence of interaction, replication is needed before drawing firm conclusions.
Y1  - 2013
U6  - https://doi.org/10.1371/journal.pone.0059136
SN  - 1932-6203
VL  - 8
IS  - 3
PB  - PLoS
CY  - San Fransisco
ER  - 
TY  - JOUR
A1  - Kuptsov, Pavel V.
A1  - Kuznetsov, Sergey P.
A1  - Pikovskij, Arkadij
T1  - Hyperbolic chaos at blinking coupling of noisy oscillators
JF  - Physical review : E, Statistical, nonlinear and soft matter physics
N2  - We study an ensemble of identical noisy phase oscillators with a blinking mean-field coupling, where onecluster and two-cluster synchronous states alternate. In the thermodynamic limit the population is described by a nonlinear Fokker-Planck equation. We show that the dynamics of the order parameters demonstrates hyperbolic chaos. The chaoticity manifests itself in phases of the complex mean field, which obey a strongly chaotic Bernoulli map. Hyperbolicity is confirmed by numerical tests based on the calculations of relevant invariant Lyapunov vectors and Lyapunov exponents. We show how the chaotic dynamics of the phases is slightly smeared by finite-size fluctuations. DOI: 10.1103/PhysRevE.87.032912
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevE.87.032912
SN  - 1539-3755
VL  - 87
IS  - 3
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Komarov, Maxim
A1  - Pikovskij, Arkadij
T1  - Dynamics of multifrequency oscillator communities
JF  - Physical review letters
N2  - We consider a generalization of the Kuramoto model of coupled oscillators to the situation where communities of oscillators having essentially different natural frequencies interact. General equations describing possible resonances between the communities' frequencies are derived. The simplest situation of three resonantly interacting groups is analyzed in detail. We find conditions for the mutual coupling to promote or suppress synchrony in individual populations and present examples where the interaction between communities leads to their synchrony or to a partially asynchronous state or to a chaotic dynamics of order parameters. DOI: 10.1103/PhysRevLett.110.134101
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevLett.110.134101
SN  - 0031-9007
VL  - 110
IS  - 13
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Pingel, P.
A1  - Neher, Dieter
T1  - Comprehensive picture of p-type doping of P3HT with the molecular acceptor F(4)TCNQ
JF  - Physical review : B, Condensed matter and materials physics
N2  - By means of optical spectroscopy, Kelvin probe, and conductivity measurements, we study the p-type doping of the donor polymer poly(3-hexylthiophene), P3HT, with the molecular acceptor tetrafluorotetracyanoquin-odimethane, F(4)TCNQ, covering a broad range of molar doping ratios from the ppm to the percent regime. Thorough quantitative analysis of the specific near-infrared absorption bands of ionized F(4)TCNQ reveals that almost every F(4)TCNQ dopant undergoes integer charge transfer with a P3HT site. However, only about 5% of these charge carrier pairs are found to dissociate and contribute a free hole for electrical conduction. The nonlinear behavior of the conductivity on doping ratio is rationalized by a numerical mobility model that accounts for the broadening of the energetic distribution of transport sites by the Coulomb potentials of ionized F(4)TCNQ dopants. DOI: 10.1103/PhysRevB.87.115209
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevB.87.115209
SN  - 1098-0121
VL  - 87
IS  - 11
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Voss, Björn
A1  - Bolhuis, Henk
A1  - Fewer, David P.
A1  - Kopf, Matthias
A1  - Möke, Fred
A1  - Haas, Fabian
A1  - El-Shehawy, Rehab
A1  - Hayes, Paul
A1  - Bergman, Birgitta
A1  - Sivonen, Kaarina
A1  - Dittmann-Thünemann, Elke
A1  - Scanlan, Dave J.
A1  - Hagemann, Martin
A1  - Stal, Lucas J.
A1  - Hess, Wolfgang R.
T1  - Insights into the physiology and ecology of the brackish-water-adapted cyanobacterium nodularia spumigena CCY9414 based on a genome-transcriptome analysis
JF  - PLoS one
N2  - Nodularia spumigena is a filamentous diazotrophic cyanobacterium that dominates the annual late summer cyanobacterial blooms in the Baltic Sea. But N. spumigena also is common in brackish water bodies worldwide, suggesting special adaptation allowing it to thrive at moderate salinities. A draft genome analysis of N. spumigena sp. CCY9414 yielded a single scaffold of 5,462,271 nucleotides in length on which genes for 5,294 proteins were annotated. A subsequent strand-specific transcriptome analysis identified more than 6,000 putative transcriptional start sites (TSS). Orphan TSSs located in intergenic regions led us to predict 764 non-coding RNAs, among them 70 copies of a possible retrotransposon and several potential RNA regulators, some of which are also present in other N2-fixing cyanobacteria. Approximately 4% of the total coding capacity is devoted to the production of secondary metabolites, among them the potent hepatotoxin nodularin, the linear spumigin and the cyclic nodulapeptin. The transcriptional complexity associated with genes involved in nitrogen fixation and heterocyst differentiation is considerably smaller compared to other Nostocales. In contrast, sophisticated systems exist for the uptake and assimilation of iron and phosphorus compounds, for the synthesis of compatible solutes, and for the formation of gas vesicles, required for the active control of buoyancy. Hence, the annotation and interpretation of this sequence provides a vast array of clues into the genomic underpinnings of the physiology of this cyanobacterium and indicates in particular a competitive edge of N. spumigena in nutrient-limited brackish water ecosystems.
Y1  - 2013
U6  - https://doi.org/10.1371/journal.pone.0060224
SN  - 1932-6203
VL  - 8
IS  - 3
PB  - PLoS
CY  - San Fransisco
ER  - 
TY  - JOUR
A1  - Karpuz, Eylem Guzel
A1  - Cevik, Ahmet Sinan
A1  - Koppitz, Jörg
A1  - Cangul, Ismail Naci
T1  - Some fixed-point results on (generalized) Bruck-Reilly *-extensions of monoids
JF  - Fixed point theory and applications
N2  - In this paper, we determine necessary and sufficient conditions for Bruck-Reilly and generalized Bruck-Reilly *-extensions of arbitrary monoids to be regular, coregular and strongly pi-inverse. These semigroup classes have applications in various field of mathematics, such as matrix theory, discrete mathematics and p-adic analysis (especially in operator theory). In addition, while regularity and coregularity have so many applications in the meaning of boundaries (again in operator theory), inverse monoids and Bruck-Reilly extensions contain a mixture fixed-point results of algebra, topology and geometry within the purposes of this journal.
KW  - Bruck-Reilly extension
KW  - generalized Bruck-Reilly *-extension
KW  - pi-inverse monoid
KW  - regular monoid
Y1  - 2013
U6  - https://doi.org/10.1186/1687-1812-2013-78
SN  - 1687-1812
IS  - 3
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Costa, Alexandre Cunha
A1  - Förster, Saskia
A1  - de Araujo, Jose Carlos
A1  - Bronstert, Axel
T1  - Analysis of channel transmission losses in a dryland river reach in north-eastern Brazil using streamflow series, groundwater level series and multi-temporal satellite data
JF  - Hydrological processes
N2  - Scarcity of hydrological data, especially streamflow discharge and groundwater level series, restricts the understanding of channel transmission losses (TL) in drylands. Furthermore, the lack of information on spatial river dynamics encompasses high uncertainty on TL analysis in large rivers. The objective of this study was to combine the information from streamflow and groundwater level series with multi-temporal satellite data to derive a hydrological concept of TL for a reach of the Middle Jaguaribe River (MJR) in semi-arid north-eastern Brazil. Based on this analysis, we proposed strategies for its modelling and simulation. TL take place in an alluvium, where river and groundwater can be considered to be hydraulically connected. Most losses certainly infiltrated only through streambed and levees and not through the flood plains, as could be shown by satellite image analysis. TL events whose input river flows were smaller than a threshold did not reach the outlet of the MJR. TL events whose input flows were higher than this threshold reached the outlet losing on average 30% of their input. During the dry seasons (DS) and at the beginning of rainy seasons (DS/BRS), no river flow is expected for pre-events, and events have vertical infiltration into the alluvium. At the middle and the end of the rainy seasons (MRS/ERS), river flow sustained by base flow occurs before/after events, and lateral infiltration into the alluvium plays a major role. Thus, the MJR shifts from being a losing river at DS/BRS to become a losing/gaining (mostly losing) river at MRS/ERS. A model of this system has to include the coupling of river and groundwater flow processes linked by a leakage approach.
KW  - channel transmission losses
KW  - multi-temporal RapidEye satellite data
KW  - semi-arid hydrology
KW  - north-eastern Brazil
KW  - dryland rivers
KW  - riveraquifer interaction
Y1  - 2013
U6  - https://doi.org/10.1002/hyp.9243
SN  - 1099-1085
VL  - 27
IS  - 7
SP  - 1046
EP  - 1060
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Dodoo, Samuel
A1  - Balzer, Bizan N.
A1  - Hugel, Thorsten
A1  - Laschewsky, André
A1  - von Klitzing, Regine
T1  - Effect of ionic strength and layer number on swelling of polyelectrolyte multilayers in water vapour
JF  - Soft materials
N2  - The swelling behavior of polyelectrolyte multilayers (PEMs) of poly(sodium-4 styrene sulfonate) (PSS) and poly(diallyl dimethyl ammonium chloride) (PDADMAC) prepared from aqueous solution of 0.1 M and 0.5 M NaCl are investigated by ellipsometry and Atomic Force Microscopy (AFM). From 1 double-layer up to 4 double-layers of 0.1 M NaCl, the amount of swelling water in the PEMs decreases with increasing number of adsorbed double layers due to an increase in polyelectrolyte density as a result of the attraction between the positively charged outermost PDADMAC layer and the Si substrate. From 6 double layers to 30 double layers, the attraction is reduced due to a much larger distance between substrate and outermost layer leading to a much lower polyelectrolyte density and higher swelling water. In PEMs prepared from aqueous solution of 0.5 M NaCl, the amount of water constantly increases which is related to a monotonically decreasing polyelectrolyte density with increasing number of polyelectrolyte layers. Studies of the surface topology also indicate a transition from a more substrate affected interphase behavior to a continuum properties of the polyelectrolyte multilayers. The threshold for the transition from interphase to continuum behavior depends on the preparation conditions of the PEM.
KW  - Continuum properties
KW  - Interphase behavior
KW  - Ionic strength
KW  - Multilayers
KW  - Polyelectrolytes
KW  - Substrate effect
KW  - Swelling behavior
KW  - Threshold
KW  - Water vapor
Y1  - 2013
U6  - https://doi.org/10.1080/1539445X.2011.607203
SN  - 1539-445X
VL  - 11
IS  - 2
SP  - 157
EP  - 164
PB  - Taylor & Francis Group
CY  - Philadelphia
ER  -