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  • 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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    High-Resolution Imaging of Texture and Microstructure by the Moving Detector Method (2018)
    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.
    Keywords: 551 ; VAE 120 ; VKA 200 ; VGA 410 ; 38.03
    Language: English
    Type: article , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 3
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    Did Viking discover life on Mars? (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A major argument in the claim that life had been discovered during the Viking mission to Mars is that the results obtained in the Labeled Release (LR) experiment are analogous to those observed with terrestrial microorganisms. This assertion is critically examined and found to be implausible.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life (ISSN 0169-6149); Volume 29; 6; 625-31
    Format: text
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  • 4
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    On the search for extant life on Mars (1996)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Proposals for continuing the search for extant life on Mars are primarily predicated on the assumption that specialized environmental niches that could support a biota may exist on the planet. Before attempting any critical tests for extant organisms, either in situ or on returned samples, it is imperative to determine whether any such sites actually exist. If, through remote sensing and landed instrumentation, sites of potential biological interest are discovered and characterized, biological tests can then more effectively be planned to elicit the presence of organisms that are adapted to living in these particular environments.
    Keywords: Exobiology
    Type: Icarus (ISSN 0019-1035); Volume 120; 431-6
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Extraterrestrial biology - Prospects and problems (1968)
    In:  CASI
    Details
    Publication Date: 2005-11-17
    Description: Evolution of life in universe
    Keywords: SPACE SCIENCES
    Type: SCHOOL OF AEROSPACE MED. BIOASTRONAUT. AND THE EXPLORATION OF SPACE NOV. 1968; P 569-593
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The evolution of CELSS for lunar bases (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A bioregenerative life support system designed to address the fundamental requirements of a functioning independent lunar base is presented in full. Issues to be discussed are associated with CELSS weight, volume and cost of operation. The fundamental CELSS component is a small, highly automated module containing plants which photosynthesize and provide the crew with food, water and oxygen. Hydrogen, nitrogen and carbon dioxide will be initially brought in from earth, recycled and their waste products conserved. As the insufficiency of buffers necessitates stringent cybernetic control, a stable state will be maintained by computer control. Through genetic engineering and carbon dioxide, temperature, and nutrient manipulation, plant productivity can be increased, while the area necessary for growth and illumination energy decreased. In addition, photosynthetic efficiency can be enhanced through lamp design, fiber optics and the use of appropriate wavelengths. Crop maintenance will be performed by robotics, as a means of preventing plant ailments.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Variations in the localization of acetyl- coenzyme A synthetase in aerobic yeast cells (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Acetyl-coenzyme A synthetase in aerobic yeast cells localization in microsomal fraction by density gradients
    Keywords: BIOSCIENCES
    Type: ; - CALCULATION OF THR
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The coming search for life on Mars (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Extraterrestrial life hypotheses, citing astronomical considerations, inorganic chemical evolution and prebiotic synthesis with emphasis on Mars exploration for microorganisms
    Keywords: BIOSCIENCES
    Type: ; VUE SCIENTIFIQUE ET
    Format: text
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  • 9
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    Evidence for two immunologically distinct acetyl-coenzyme A synthetases in yeast (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Evidence is presented that clearly establishes the presence of two acetyl-CoA synthetases in Saccharomyces cerevisiae, one elaborated under 'aerobic' conditions, the other under 'nonaerobic' conditions. The antibody produced by each enzyme is immunologically specific.
    Keywords: CHEMISTRY
    Type: Biochimica et Biophysica Acta; 341; 1974
    Format: text
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  • 10
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    Biological experiments - The Viking Mars Lander. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: From the biological point of view, the Viking 1975 mission might be regarded as a test of the Oparin-Haldane hypothesis concerning the chemical evolution of living systems. Mars is a planet whose early history was probably similar to that of the earth and whose present environmental conditions may be compatible with the maintenance of living organisms. Thus, the biological experiments aboard the Viking I spacecraft are primarily concerned with the question of whether chemical evolution on Mars took place, and, if so, whether the process reached a level of complexity characteristic of replicating systems.
    Keywords: BIOTECHNOLOGY
    Type: Icarus; 16; Feb. 197
    Format: text
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