Search Results - (Author, Cooperation:U. Ott)
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1Latest Papers from Table of Contents or Articles in PressM. 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 2014Staff ViewPublication Date: 2014-08-12Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressF. Keppler ; I. Vigano ; A. McLeod ; U. Ott ; M. Fruchtl ; T. Rockmann
Nature Publishing Group (NPG)
Published 2012Staff ViewPublication Date: 2012-06-09Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Atmosphere/*chemistry ; Exobiology ; Extraterrestrial Environment/*chemistry ; Hawaii ; *Mars ; *Meteoroids ; Methane/*chemistry/*radiation effects ; Pectins/chemistry ; Pressure ; Soil/chemistry ; Temperature ; *Ultraviolet RaysPublished by: -
3Articles: DFG German National LicensesKoscheev, A. P. ; Gromov, M. D. ; Mohapatra, R. K. ; Ott, U.
[s.l.] : Macmillian Magazines Ltd.
Published 2001Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [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 ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [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 ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0168-1176Keywords: Channeltrons ; Isotope abundance mass spectrometry ; Multiple ion countingSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1572-9168Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [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 ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1432-0878Keywords: Key words Apoptosis ; p53 ; Ischemia ; Enterocytes ; Proliferation ; Differentiation ; ISEL ; Glomeruli ; Mouse (Balb/c) ; HumanSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: 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 ResourceURL: