Search Results - (Author, Cooperation:U. Ott)

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  1. 1
    F. Keppler ; I. Vigano ; A. McLeod ; U. Ott ; M. Fruchtl ; T. Rockmann
    Nature Publishing Group (NPG)
    Published 2012
    Staff View
    Publication Date:
    2012-06-09
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Atmosphere/*chemistry ; Exobiology ; Extraterrestrial Environment/*chemistry ; Hawaii ; *Mars ; *Meteoroids ; Methane/*chemistry/*radiation effects ; Pectins/chemistry ; Pressure ; Soil/chemistry ; Temperature ; *Ultraviolet Rays
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
    M. Lugaro ; A. Heger ; D. Osrin ; S. Goriely ; K. Zuber ; A. I. Karakas ; B. K. Gibson ; C. L. Doherty ; J. C. Lattanzio ; U. Ott
    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-08-12
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Koscheev, A. P. ; Gromov, M. D. ; Mohapatra, R. K. ; Ott, U.

    [s.l.] : Macmillian Magazines Ltd.
    Published 2001
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Diamond grains are the most abundant presolar grains found in primitive meteorites. They formed before the Solar System, and therefore provide a record of nuclear and chemical processes in stars and in the interstellar medium. Their origins are inferred from the unusual isotopic compositions of ...
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Richter, S. ; Begemann, F. ; Ott, U.

    [s.l.] : Macmillan Magazines Ltd.
    Published 1998
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Carbon-rich ‘carbonaceous’ meteorites contain several types of dust grains with an isotopic signature that identifies them as being of pre-solar origin. Of these grains, diamonds are of particular interest: such grains are by far the most abundant, and they host an isotopically ...
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Verchovsky, A.B. ; Ott, U. ; Begemann, F.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0012-821X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Geosciences
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  6. 6
    Liardon, R. ; Ledermann, S. ; Ott, U.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0021-9673
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  7. 7
    Liardon, R. ; Ledermann, S. ; Ott, U.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0021-9673
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  8. 8
    Richter, S. ; Ott, U. ; Begemann, F.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0168-1176
    Keywords:
    Channeltrons ; Isotope abundance mass spectrometry ; Multiple ion counting
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  9. 9
    Ghinelli, D. ; Melone, N. ; Ott, U.
    Springer
    Published 1989
    Staff View
    ISSN:
    1572-9168
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mathematics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  10. 10
    Ott, U. ; Begemann, F.

    [s.l.] : Nature Publishing Group
    Published 1985
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The gas concentrations as well as elemental abundance ratios in Shergotty, Nakhla and Chassigny are very different from one another and from those in EETA 79001 and the martian atmosphere (Table 1). This by itself argues neither against a common origin of the meteorites nor against their origin ...
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1432-0878
    Keywords:
    Key words Apoptosis ; p53 ; Ischemia ; Enterocytes ; Proliferation ; Differentiation ; ISEL ; Glomeruli ; Mouse (Balb/c) ; Human
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Medicine
    Notes:
    Abstract  Morphological changes associated with apoptosis are closely correlated with the expression of specific proteins. However, the cause-effect relationships between the expression of these proteins and DNA degradation are barely known. For studying expression of apoptosis-related proteins in relation to different degrees of DNA fragmentation, the small intestine with its spatially organized continuum of proliferation, differentiation and death is a very useful preparation. Enterocytes towards the apex of the villi become increasingly susceptible to apoptosis. Here, this ”apoptotic gradient” is used to demonstrate the presence of BAX and BCL-2 proteins in the cytoplasm of cells at the onset of apoptosis. In semithin serial sections of the small intestine, BAX, BCL-2 and DNA fragmentation were demonstrated. BAX and BCL-2 are always colocalized and only in cells with fragmented DNA. The gradient of BAX or BCL-2 staining is similar to the gradient of DNA fragmentation. Immunoreactivity for BCL-2 or BAX is most intense in cells that are prone to become apoptotic next in the course of cellular turnover but not in cells in an advanced apoptotic state, showing strongly condensed chromatin. When using the same technique on semithin sections of kidney biopsies, containing epithelia with low cellular turnover, we found DNA fragmentation mainly in the epithelial cells of the distal tubules. Similar to the situation in the enterocytes, BAX staining was confined to the cytoplasm of epithelial cells with a moderate degree of DNA fragmentation and reduced in epithelial cells with a high degree of DNA fragmentation. In contrast to the situation in the small intestine, very low levels of BCL-2 were found. The results suggest that expression of BCL-2 and BAX is related to cell damage as indicated by DNA fragmentation but not to advanced stages of cellular death, as indicated by chromatin condensation and cellular shrinkage.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses