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  • 1
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    Evidence for two immunologically distinct acetyl-coenzyme A synthetases in yeast (1974)
    In:  Other Sources
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    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
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  • 2
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    The Viking biological investigation - General aspects (1977)
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    Publication Date: 2011-08-17
    Description: The Viking biological investigation has tested four different hypotheses regarding the possible nature of Martian organisms. While significant results were obtained for each of these, tests of three of the hypotheses appear to indicate the absence of biology in the samples used, while the fourth is consistent with a biological interpretation. The original assumptions for each experiment and the experimental procedures that were utilized to test these assumptions are reviewed.
    Keywords: SPACE BIOLOGY
    Type: Journal of Geophysical Research; 82; Sept. 30
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  • 3
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    Studies on acetyl-coenzyme A synthetase of yeast - Inhibition by long-chain acyl-coenzyme A esters (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: CHEMISTRY
    Type: Journal of Bacteriology; 115; Aug. 197
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  • 4
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    Activation of fatty acid synthesis in cell-free extracts of Saccharomyces cerevisiae. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Fatty acid synthesis from acetate in Saccharomyces cerevisiae extracts, discussing stimulation by alpha glycerophosphate and citrate
    Keywords: CHEMISTRY
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  • 5
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    The Viking biological experiments on Mars (1978)
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    Publication Date: 2011-08-17
    Description: The three biological experiments on board the Viking Mars Landers are discussed. The gas exchange experiment provided periodic measurements of the composition and quantity of gases from Martian surface material, either in a humid or a wet nutrient sampling mode. The labeled release experiment demonstrated that adding an aqueous solution of dilute radioactive compounds to Martian material caused a rapid release of labeled gas. The results of the pyrolytic release experiment remain difficult to interpret. Data from the first two experiments suggest that oxidants (including H2O2 and iron oxide) rather than biota may account for all the observed reactions.
    Keywords: SPACE BIOLOGY
    Type: Icarus; 34; June 197
    Format: text
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  • 6
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    General constraints on the Viking biology investigation (1976)
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    Publication Date: 2011-08-17
    Description: The paper discusses some of the constraints pertaining to the Viking mission for detection of life on Mars, within which the Viking experiments were conceived, designed, and developed. The most important limitation to the entire study is the complete information about the nature of Mars, such as the chemical composition of the surface material of Mars and the exact identification of the constituents of that planet. Ways in which celestial mechanics places severe limitations on the Viking biology investigation are discussed. Major engineering constraints are examined relative to the accomodation of biology instrument inside the Viking lander and to the design of the instrument itself. Other constraints discussed concern the operational aspects of the mission and the testing program.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life; 7; Aug. 197
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  • 7
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    The Viking mission search for life on Mars (1976)
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    Publication Date: 2011-08-16
    Description: The scientific payload on the Viking Mars landers is described. Shortly after landing, two facsimile cameras capable of stereoscopic imaging will scan the landing site area in black and white, color, and infrared to reveal gross evidence of past or present living systems. A wide range mass spectrometer will record a complete mass spectrum for soil samples from mass 12 to mass 200 every 10.3 sec. Three experiments based on different assumptions on the nature of life on Mars, if it exists, will be carried out by the bio-lab. A pyrolytic release experiment is designed to measure photosynthetic or dark fixation of carbon dioxide or carbon monoxide into organic compounds. A labelled release experiment will test for metabolic activity during incubation of a surface sample moistened with a solution of radioactively labelled simple organic compounds. A gas exchange experiment will detect changes in the gaseous medium surrounding a soil sample as the result of metabolic activity. The hardware, function, and terrestrial test results of the bio-lab experiments are discussed.
    Keywords: SPACE BIOLOGY
    Type: Nature; 262; July 1
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  • 8
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    Effects of metals on acetyl-coenzyme A carboxylase activity of saccharomyces cerevisiae. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Metal cation effects on acetyl-Coenzyme A carboxylase reaction, discussing magnesium stimulation of reaction
    Keywords: CHEMISTRY
    Type: ; ADEMIE DES SCIENCES
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  • 9
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    Simulation of the Viking biology experiments - An overview (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: In the present paper, ground-based investigations of the Viking Martian biology data, which have resulted in reasonable simulations of these data, are reviewed. These simulations, which in strong oxidants, UV-treated materials, iron-containing clays, or iron salts were used as Martian analogs, are capable of explaining the ambiguity between the GCMS (gas-chromatography mass-spectrometry) experiments, in which no organic compounds were found on Mars, and the Labeled Release experiments, in which added organics were decomposed.
    Keywords: SPACE BIOLOGY
    Type: Journal of Molecular Evolution; 14; Dec. 197
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  • 10
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    The Viking biological investigations - Review and status (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The three experimental approaches incorporated into the Viking biology instrument have yielded results that are most readily explained as nonbiological phenomena. The predominant view among investigators trying to simulate the Mars results is that the surface material of Mars contains strongly oxidizing compounds which would account for many of the more intense reactions seen on Mars. Other mechanisms are also currently being proposed and studied.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life; 9; Dec. 197
    Format: text
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