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  • LIFE SCIENCES (GENERAL)  (3)
  • Superfluidity and superconductivity  (2)
  • 548  (1)
  • Gefügekunde der Gesteine  (1)
  • 2010-2014  (3)
  • 1995-1999
  • 1975-1979  (3)
Collection
Keywords
Publisher
Language
Years
  • 2010-2014  (3)
  • 1995-1999
  • 1975-1979  (3)
  • 1980-1984  (11)
Year
  • 1
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    High-Resolution Imaging of Texture and Microstructure by the Moving Detector Method (2010)
    Details
    Publication Date: 2021-03-29
    Description: In order to describe texture and microstructure of a polycrystalline material completely, crystal orientation g={?1F?2} must be known in all points x={x1?x2?x3} of the material. This can be achieved by locationresolved diffraction of high-energy, i.e. short-wave, X-rays from synchrotron sources. Highest resolution in the orientation- as well as the location-coordinates can be achieved by three variants of a detector sweeping technique in which an area detector is continuously moved during exposure. This technique results in two-dimensionally continuous images which are sections and projections of the six-dimensional orientation location space. Further evaluation of these images depends on whether individual grains are resolved in them or not. Because of the high penetration depth of high-energy synchrotron radiation in matter, this technique is also, and particularly, suitable for the investigation of the interior of big samples.
    Description: research
    Keywords: 548 ; VAE 120 ; VKA 200 ; VGA 410 ; Methodik {Strukturgeologie} ; Gefügekunde der Gesteine ; Röntgenanalyse {Mineralogie: Kristallographie}
    Language: English
    Type: article , publishedVersion
    Format: 18 S.
    Format: application/pdf
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    CITATION GEO-LEO
  • 2
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    Vortex creep down to 0.3 K in superconducting Fe(Te,Se) single crystals (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-01-30
    Description: Author(s): T. Klein, H. Grasland, H. Cercellier, P. Toulemonde, and C. Marcenat We report on a study of the vortex creep in Fe1+δ(TexSe1−x) single crystals (x=0.5 and 0.4) down to 0.28 K (∼Tc/50) and up to μ0Ha=2T. The relaxation of the current density [J(t)] has been measured during 20 hours and the decay of J(t) can be well described by a J(t)∝[ln(t/t0)]−1/μ law. We show that... [Phys. Rev. B 89, 014514] Published Wed Jan 29, 2014
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 3
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    Thickness dependence of the superconducting critical temperature in heavily doped Si:B epilayers (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-08-13
    Description: Author(s): A. Grockowiak, T. Klein, H. Cercellier, F. Lévy-Bertrand, X. Blase, J. Kačmarčik, T. Kociniewski, F. Chiodi, D. Débarre, G. Prudon, C. Dubois, and C. Marcenat We report on the superconducting properties of a series of heavily doped Si:B epilayers grown by gas immersion laser doping with boron content ( n B ) ranging from ∼3×10 20 cm −3 to ∼6×10 21 cm −3 and thickness ( d ) varying between ∼20 nm and ∼210 nm. We show that superconductivity is only observed for n B va... [Phys. Rev. B 88, 064508] Published Mon Aug 12, 2013
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 4
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    Factors affecting the palmitoyl-coenzyme A desaturase of Saccharomyces cerevisiae (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The activity and stability of the palmitoyl-coenzyme A (CoA) desaturase complex of Saccharomyces cerevisiae was influenced by several factors. Cells, grown nonaerobically and then incubated with glucose, either in air or under N2, showed a marked increase in desaturase activity. Cycloheximide, added during such incubations, prevented the increase in activity, suggesting de novo synthesis. The stability of the desaturase from cells grown nonaerobically was affected by subsequent treatment of the cells; enzyme from freshly harvested cells, or from cells that were then shaken under nitrogen, readily lost activity upon washing or during density gradient analysis, whereas aerated cells, in the presence or absence of glucose, yielded stable enzyme preparations. The loss of activity in nonaerobic preparations could be reversed by adding soluble supernatant from these homogenates and could be prevented by growing the cells in the presence of palmitoleic acid and ergosterol, but not with several other lipids tested.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Bacteriology; 124; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Oxygen as a factor in eukaryote evolution - Some effects of low levels of oxygen on Saccharomyces cerevisiae (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A comparative study of the effects of varying levels of oxygen on some of the metabolic functions of the primitive eukaryote, Saccharomyces cerevisiae, has shown that these cells are responsive to very low levels of oxygen: the level of palmitoyl-Co A desaturase was greatly enhanced by only 0.03 vol % oxygen. Similarly, an acetyl-CoA synthetase associated predominantly with anaerobic growth was stimulated by as little as 0.1% oxygen, while an isoenzyme correlated with aerobic growth was maximally active at much higher oxygen levels (greater than 1%). Closely following this latter pattern were three mitochondrial enzymes that attained maximal activity only under atmospheric levels of oxygen.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Origins of Life; 9; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Effects of aeration on formation and localization of the acetyl coenzyme A synthetases of Saccharomyces cerevisiae (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Previous studies on the yeast Saccharomyces cerevisiae have shown that two different forms of the enzyme acetyl coenzyme A synthetase (ACS) are present, depending on the conditions under which the cells are grown. The paper evaluates the usefulness of a method designed to assay both synthetases simultaneously in yeast homogenates. The data presented confirm the possibility of simultaneous detection and estimation of the amount of both ACSs of S. cerevisiae in crude homogenates of this strain, making possible the study of physiological factors involved in the formation of these isoenzymes. One important factor for specifying which of the two enzymes is found in these yeast cells is the presence or absence of oxygen in their environment. Aeration not only affects the ratio of the two ACSs but also appears to affect the cellular distribution of these enzymes. Most of the data presented suggest the possibility that the nonaerobic ACS may serve as a precursor to the aerobic form.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Bacteriology; 137; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
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