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  • LIFE SCIENCES (GENERAL)  (15)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • 1
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    Short-term and long-term clinostat and vibration-induced biochemical changes in dwarf marigold stems (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Stems of 21-day dwarf marigold plants cultivated on the clinostat were compared with plants cultivated on vertical axis rotators ('vibrational controls') and stationary controls for long-term changes in cell wall composition. Stems of 21-day plants grown under stationary conditions and subsequently exposed to the clinostat for 24 hours were also analyzed. Among the long-term markers, calcium, lignin, and protein-bound hemicellulose (possibly cell wall glycoprotein) clearly differentiated the effects of vibration from those of the clinostat. Short-term differential responses included rate of ethylene production, nastic movement and peroxidase activity of the cell wall, but not of the protoplast.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: (ISSN 0273-1177)
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    NASA TECHNICAL REPORTS
  • 2
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    The performance and capabilities of terrestrial organisms in extreme and unusual gaseous and liquid environments. Performance of fungi in exotic and harsh environments (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The growth of Penicillium in saline and low temperature conditions during a 15 month incubation period was studied. Data are also given on the potential 1f fungu for modification of the surface geochemistry of the earth and the capacity of these fungi to solubilize and concentrate metals.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA-CR-145395 , PAPER-40
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  • 3
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    Differential permeation of artemia cysts and cucumber seeds by alcohols (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The rate of penetration of the simpler alcohols into brine shrimp cysts and cucumber seeds was studied. In solutions below 70% the rate of penetration is related to lipid solvent capacity of the alcohol. In concentrations above 70%, particularly in absolute alcohols, methanol penetrates brine shrimp rapidly and ethanol penetrates slowly. All the other alcohols tested did not penetrate the dormant structures. Ethionine and deuteroxy-methanol did not affect the rate of penetration of methanol. It is suggested that in dehydrated membranes the lipid moiety is protected by a continuous sheet of protein. Methanol, which is fairly similar to water, is probably able to penetrate the membrane by initiating a conformation change in the protein, exposing the lipid which subsequently dissolves in the methanol thus destroying the membrane.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Histochemistry and Cytochemistry; 23; 1, 19; 1975
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  • 4
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    Gravity, lignification, and land plant evolution (1981)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Vascular plants began their occupation of the wetlands interfacing both terrestrial and marine environments at some point in early Paleozoic time. Chemical differences between green algae and vascular land plants are mainly related to an abundance of lignins in the land plants. Answers to questions relating to the phylogeny and adaptive significance of the lignins must depend on experiments and observations using contemporary plant material. A summary is provided of a series of such observations. It is found that the differences between modern Chlorophyta and vascular land plants cannot be explained in full on the basis of lignification alone. Nevertheless, the data point to the emergence of the primitive land populations into an oxygen-rich terrestrial world where the need for mechanical support and water conservation could be met by a single aerobic biochemical process connected to essential aromatic amino acids likely to be found in every cell
    Keywords: LIFE SCIENCES (GENERAL)
    Type: In: Life in the universe; June 19, 20, 1979; Moffett Field, CA
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  • 5
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    Release of volatile mercury from vascular plants (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Volatile, organic solvent soluble mercury has been found in leaves and seeds of several angiosperms. Leaves of garlic vine, avocado, and haole-koa release mercury in volatile form rapidly at room temperature. In garlic vine, the most active release is temperature dependent, but does not parallel the vapor-pressure temperature relationship for mercury. Mercury can be trapped in nitric-perchloric acid digestion fluid, or n-hexane, but is lost from the hexane unless the acid mixture is present. Seeds of haole-koa also contain extractable mercury but volatility declines in the series n-hexane (90%), methanol (50%), water (10%). This suggests that reduced volatility may accompany solvolysis in the more polar media.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Physiologia Plantarum; 32; 1974
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  • 6
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    Thermal and ionic factors in the ultraviolet photolysis of plant cell membranes (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Physiologia Plantarum; 31; 1974
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  • 7
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    Performance of fungi in low temperature and hypersaline environments (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Open Meeting of the Working Group on Space Biology; May 29, 1975 - Jun 07, 1975; Varna; Bulgaria|May 30, 1975 - May 31, 1975
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  • 8
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    Geomycology (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Fungi have long been known to have capabilities for reduction and alkylation of arsenate and selenate but their general capabilities for solubilizing and accumulating metallic substances have been given serious attention only in recent years. Common members of the Aspergillaceae cultured on boron, copper, lead and other metals or oxides can solubilize and concentrate the elements or their compounds. To account for biosolubilization of the metals, we have set up a model study, incubating selected metals, e.g., mercury, in solutions of various metabolites including L-lysine and citric acid. Results of 100-300 days incubation showed that many metals can in fact be readily solubilized, and in some cases more effectively at pH 6-7 than at pH 1.5-2.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: May 30, 1975 - May 31, 1975|Open Meeting of the Working Group on Space Biology; May 29, 1975 - Jun 07, 1975; Varna; Bulgaria
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  • 9
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    Study of metabolism and energetics in hypogravity: Degenerative effects of prolonged hypogravity (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The role of gravity in the formation of rigid, lignified plant cell walls hence to the development of the erect land plant body is examined. An experiment was proposed with a general hypothesis that a chosen plant, a dwarf marigold, would display degenerative changes in mechanical supportive systems under hypogravity because normal lignin-cellulose wall structure fails to develop. Observational and experimental results are given.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA-CR-155199
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  • 10
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    The effects of temperature, salinity, and other factors on the growth and formation of UV-absorbing substances by the fungus Aspergillus (1978)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Life sciences and space research XVI; Open Meetings of the Working Group on Space Biology; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
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