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339,999 research outcomes, page 1 of 34,000
  • publication . Article . 1988
    Closed Access
    Authors:
    Jessberger, Elmar K.; Christoforidis, Alexander; Kissel, Jochen;
    Persistent Identifiers
    Publisher: Springer Science and Business Media LLC

    The chemical composition of the solid grains from comet Halley can be inferred from impact-ionization time-of-flight mass spectrometry. Halley's dust in the vicinity of the VEGA-1 spacecraft is a mixture of a refractory organic component and unequilibrated silicates, bu...

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  • It is well documented that ancient sickle harvesting led to tough rachises, but the other seed dispersal properties in crop progenitors are rarely discussed. The first steps toward domestication are evolutionary responses for the recruitment of humans as dispersers. See...

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  • publication . Article . 2003
    Open Access
    Authors:
    Ulrich Meyer;
    Persistent Identifiers
    Publisher: Elsevier BV

    We study the average-case running-time of single-source shortest-path (SSSP) algorithms assuming arbitrary directed graphs with n nodes, m edges, and independent random edge weights uniformly distributed in [0,1]. We give the first label-setting and label-correcting alg...

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  • publication . Article . Other literature type . 2013
    Open Access
    Authors:
    Roscher, Christiane; Schumacher, Jens; Lipowsky, Annett; Gubsch, Marlén; Weigelt, Alexandra; Pompe, Sven; Kolle, Olaf; Buchmann, Nina; Schmid, Bernhard; Schulze, Ernst-Detlef;
    Publisher: Elsevier BV
    Country: Switzerland
    Project: SNSF | Mechanisms underlying pla... (310030E-131193), SNSF | Community history and eco... (31003A_130720)

    a b s t r a c t Several multi-year biodiversity experiments have shown positive species richness-productivity rela- tionships which strengthen over time, but the mechanisms which control productivity are not well understood. We used experimental grasslands (Jena Experim...

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  • publication . Article . 1998
    Closed Access
    Authors:
    R. Mielke; Josef Kessler; Brigitte Szelies; Karl Herholz; Klaus Wienhard; W.-D. Heiss;
    Persistent Identifiers
    Publisher: Springer Science and Business Media LLC

    Normal aging of the brain is predominantly characterized by metabolic changes in the prefrontal cortex. While in middle age there is a trend to hyperfrontality, PET demonstrates in old age a decline of regional cerebral glucose metabolism in frontal areas. In progeric d...

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  • publication . Article . 2006
    Closed Access
    Authors:
    Elena Ivanova; Ulrike Müller; Heinz Wässle;
    Persistent Identifiers
    Publisher: Wiley

    Glycine and gamma-aminobutyric acid (GABA) are the major inhibitory transmitters of the mammalian retina, and bipolar cells receive GABAergic and glycinergic inhibition from multiple amacrine cell types. Here we evaluated the functional properties and subunit compositio...

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  • publication . Article . Conference object . 2011
    Closed Access
    Authors:
    Bernhard Guckenbiehl; Manfred Stamm; T. Springer;
    Persistent Identifiers

    ABSTRACTThe polymer blend system of deuterated polystyrene (PSd) and the statistical copolymer poly(styrene-co-para-bromo-styrene) (PBrxS) is partially compatible or incompatible depending on the degree of bromination x. The width of the interface in a bilayer system ca...

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  • publication . Article . 2011
    Closed Access
    Authors:
    Minou S. Djannatian; Sabrina Galinski; Tobias M. Fischer; Moritz J. Rossner;
    Persistent Identifiers
    Publisher: Elsevier BV

    G protein-coupled receptors (GPCRs) constitute the largest receptor family in mammals and represent important drug targets. Signaling through GPCRs mediates physiological effects that are strongly dependent on the cellular context. Therefore, the availability of assays ...

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  • publication . Article . 2005
    Open Access
    Authors:
    Jens Antony; Gert von Helden; Gerard Meijer; Burkhard Schmidt;
    Persistent Identifiers
    Publisher: AIP Publishing

    Anharmonic vibrational calculations for the benzoic acid monomer and dimer in the mid-IR regime (500...1800 cm-1) are reported. Harmonic frequencies and intensities are obtained at the DFT/B3LYP level of theory employing D95(d,p) and cc-pVTZ basis sets. Anharmonic corre...

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  • publication . Article . 2005
    Open Access
    Authors:
    Dieter Horns;
    Persistent Identifiers
    Publisher: Elsevier BV
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339,999 research outcomes, page 1 of 34,000