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  • Other Sources  (100)
  • Man/System Technology and Life Support
  • 1985-1989  (100)
  • 1
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    The future of irradiation applications on Earth and in space (1989)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: What needs to be done to establish food irradiation on a truly commercial basis so that those living on planet Earth can fully realize the benefits of this versatile process? This question is answered in the first part of this paper. The second part covers the potential contributions of irradiated foods to feed humans in space.
    Keywords: Man/System Technology and Life Support
    Type: Food technology (ISSN 0015-6639); Volume 43; 7; 95-7
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    NASA TECHNICAL REPORTS
  • 2
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    Evidence for a plasma-membrane-bound nitrate reductase involved in nitrate uptake of Chlorella sorokiniana (1989)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Anti-nitrate-reductase (NR) immunoglobulin-G (IgG) fragments inhibited nitrate uptake into Chlorella cells but had no affect on nitrate uptake. Intact anti-NR serum and preimmune IgG fragments had no affect on nitrate uptake. Membrane-associated NR was detected in plasma-membrane (PM) fractions isolated by aqueous two-phase partitioning. The PM-associated NR was not removed by sonicating PM vesicles in 500 mM NaCl and 1 mM ethylenediaminetetraacetic acid and represented up to 0.8% of the total Chlorella NR activity. The PM NR was solubilized by Triton X-100 and inactivated by Chlorella NR antiserum. Plasma-membrane NR was present in ammonium-grown Chlorella cells that completely lacked soluble NR activity. The subunit sizes of the PM and soluble NRs were 60 and 95 kDa, respectively, as determined by sodium-dodecyl-sulfate electrophoresis and western blotting.
    Keywords: Man/System Technology and Life Support
    Type: Planta (ISSN 0032-0935); Volume 178; 19-24
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    NASA TECHNICAL REPORTS
  • 3
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    Quality assurance procedures for environmental control and monitoring in plant growth facilities. Report of the North Central Regional 101 Committee on Growth Chamber Use (1986)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This report includes procedures for ensuring the quality of the environment provided for plant growth in controlled environment facilities. Biologists and engineers may use these procedures for ensuring quality control during experiments or for ensuring quality control in the design of plant growth facilities. Environmental monitoring prior to and during experiments is included in these procedures. Specific recommendations cover control, acquisition, and calibration for sensor types for the separate parameters of radiation (light), temperature, humidity, carbon dioxide, and air movement.
    Keywords: Man/System Technology and Life Support
    Type: Biotronics (ISSN 0289-0011); Volume 15; 81-4
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  • 4
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    Characteristics of injury and recovery of net NO3- transport of barley seedlings from treatments of NaCl (1988)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The nature of the injury and recovery of nitrate uptake (net uptake) from NaCl stress in young barley (Hordeum vulgare L, var CM 72) seedlings was investigated. Nitrate uptake was inhibited rapidly by NaCl, within 1 minute after exposure to 200 millimolar NaCl. The duration of exposure to saline conditions determined the time of recovery of NO3- uptake from NaCl stress. Recovery was dependent on the presence of NO3- and was inhibited by cycloheximide, 6-methylpurine, and cerulenin, respective inhibitors of protein, RNA, and sterol/fatty acid synthesis. These inhibitors also prevented the induction of the NO3- uptake system in uninduced seedlings. Uninduced seedlings exhibited endogenous NO3- transport activity that appeared to be constitutive. This constitutive activity was also inhibited by NaCl. Recovery of constitutive NO3- uptake did not require the presence of NO3-.
    Keywords: Man/System Technology and Life Support
    Type: Plant physiology (ISSN 0032-0889); Volume 87; 878-82
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  • 5
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    Effect of 16 and 24 hours daily radiation (light) on lettuce growth (1986)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A 50% increase in total radiation by extending the photoperiod from 16 to 24 hr doubled the weight of all cultivars of loose-leaf lettuce (Lactuca sativa L.) 'Grand Rapids Forcing', 'Waldmanns Green', 'Salad Bowl', and 'RubyConn', but not a Butterhead cultivar, 'Salina'. When total daily radiation (moles of photons) was the same, plants under continuous radiation weighed 30% to 50% more than plants under a 16 hr photoperiod. By using continuous radiation on loose-leaf lettuce, fewer lamp fixtures were required and yield was increased.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 21; 1; 123-4
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  • 6
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    Life sciences and space research XXIII (3): natural and artificial ecosystems. Proceedings of the Topical Meeting of the COSPAR Interdisciplinary Scientific Commission F (Meetings F9, F10, F11 and F12) of the COSPAR Twenty-seventh Plenary Meeting held in Espoo, Finland, 18-29 July 1988 (1989)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: No abstract available
    Keywords: Man/System Technology and Life Support
    Type: Advances in space research : the official journal of the Committee on Space Research (COSPAR); Volume 9; 8; 1-196
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  • 7
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    CELSS for advanced manned mission (1988)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: An overview of the major concepts of Controlled Ecological Life Support System (CELSS) includes an identification of environmental factors, such as gravity levels, light levels, and growth volume, that influence the type of CELSS system that can be developed. Various plant growth systems are described together with their possible space applications. Life support functions performed by plants include food production, atmosphere regeneration, and water purification. Selected relationships between biological and physical-chemical life support techniques are considered as a part of these functions. Consumers in a CELSS may be humans, animals, or microorganisms, but nutritional, water, and atmosphere requirements of humans are emphasized in this report, as they are the primary requirement drivers for a CELSS design. The human role in waste generation is discussed as it affects plant nutrient availability. The role of waste management systems in recovering nutrients for plant growth and requirements for CELSS are defined for air, water, and food. Both physical and a biological nutrient recovery/waste disposal systems are examined. The separate subsystems of a CELSS are identified and discussed. Nutrient recovery, plant irradiation, automation, and facilities equipment and applications are reviewed with special attention to direct solar irradiation using fiber optics. These subsystems, along with other environmental control systems, such as thermal, humidity, and ventilation, are essential to plant growth in the space environment.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 23; 2; 275-86
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  • 8
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    Comparison of fluorescent and high-pressure sodium lamps on growth of leaf lettuce (1987)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Radiation from high-pressure sodium (HPS) lamps provided more than a 50% increased yield (fresh and dry weight of tops) of loose-leaf lettuce cultivars Grand Rapids Forcing and RubyConn, compared to that obtained by radiation from cool-white fluorescent (CWF) lamps at equal photosynthetic photon flux; yet, input wattage was approximately 36% less. It was postulated that the considerable output of 700 to 850 nm radiation from the HPS lamp was a significant factor of the increased yield. Under HPS lamps, the leaves of both cultivars were slightly less green with very little red pigmentation ('RubyConn') and slightly elongated, compared to CWF, but plant productivity per unit electrical energy input was vastly superior with HPS.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 22; 3; 424-5
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  • 9
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    Air ion exposure system for plants (1987)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A system was developed for subjecting plants to elevated air ion levels. This system consisted of a rectangular Plexiglas chamber lined with a Faraday cage. Air ions were generated by corona discharge from frayed stainless steel fibers placed at one end of the chamber. This source was capable of producing varying levels of either positive or negative air ions. During plant exposures, environmental conditions were controlled by operating the unit in a growth chamber.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 22; 1; 148-51
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  • 10
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    Irradiance and spectral distribution control system for controlled environment chambers (1987)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This paper describes a closed-loop control system for controlling the irradiance and spectral quality generated by fluorescent lamps in a controlled environment chamber. The 400 to 800 nm irradiance and the ratio of the red waveband (600 to 700 nm) to the far-red waveband (700 to 800 nm) were independently controlled and varied as functions of time. A suggested application is to investigate the possibility of synergistic effects of changing irradiance levels and changing spectral distributions on photoperiodism and photomorphogenesis.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 22; 3; 501-3
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