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  • Articles  (2)
  • Other Sources  (5)
  • Man/System Technology and Life Support  (4)
  • Atomic and molecular structure and dynamics  (1)
  • COMMUNICATIONS AND RADAR  (1)
  • Letters  (1)
  • 1
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    Oil spill dispersants [Biological Sciences] (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-03-16
    Description: Kleindienst et al. (1) question whether dispersants stimulated biodegradation following the Macondo oil release in the Gulf of Mexico, but, in fact, their experimental design illustrates why dispersants play such an essential role in oil spill response. Their method of producing “water accommodated fractions,” although routinely used for toxicity tests,...
    Keywords: Letters
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    Fano resonances observed in helium nanodroplets (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-11
    Description: Author(s): A. C. LaForge, D. Regina, G. Jabbari, K. Gokhberg, N. V. Kryzhevoi, S. R. Krishnan, M. Hess, P. O'Keeffe, A. Ciavardini, K. C. Prince, R. Richter, F. Stienkemeier, L. S. Cederbaum, T. Pfeifer, R. Moshammer, and M. Mudrich Doubly excited Rydberg states of helium (He) have been studied in nanodroplets using synchrotron radiation. Although qualitatively similar to their atomic counterparts, the Fano resonances in droplets are broader and exhibit blueshifts which increase for the higher excited states. However, varying t… [Phys. Rev. A 93, 050502(R)] Published Tue May 10, 2016
    Keywords: Atomic and molecular structure and dynamics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 3
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    A porous stainless steel membrane system for extraterrestrial crop production (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A system was developed in which nutrient flow to plant roots is controlled by a thin (0.98 or 1.18 mm) porous (0.2 or 0.5 microns) stainless steel sheet membrane. The flow of nutrient solution through the membrane is controlled by adjusting the relative negative pressure on the nutrient solution side of the membrane. Thus, the nutrient solution is contained by the membrane and cannot escape from the compartment even under microgravity conditions if the appropriate pressure gradient across the membrane is maintained. Plant roots grow directly on the top surface of the membrane and pull the nutrient solution through this membrane interface. The volume of nutrient solution required by this system for plant growth is relatively small, since the plenum, which contains the nutrient solution in contact with the membrane, needs only to be of sufficient size to provide for uniform flow to all parts of the membrane. Solution not passing through the membrane to the root zone is recirculated through a reservoir where pH and nutrient levels are controlled. The size of the solution reservoir depends on the sophistication of the replenishment system. The roots on the surface of the membrane are covered with a polyethylene film (white on top, black on bottom) to maintain a high relative humidity and also limit light to prevent algal growth. Seeds are sown directly on the stainless steel membrane under the holes in the polyethylene film that allow a pathway for the shoots.
    Keywords: Man/System Technology and Life Support
    Type: HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 25; 6; 707
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of 16 and 24 hours daily radiation (light) on lettuce growth (1986)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Comparison of fluorescent and high-pressure sodium lamps on growth of leaf lettuce (1987)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A Shuttle/SpaceLab RF environment survey facility (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes some of the basic system considerations of a proposed experiment for monitoring and measuring the global electromagnetic radiation environment. RF spectrum coverage for this spaceborne survey facility is anticipated to be quite broad and will include selected frequency bands ranging from UHF to millimeter waves. By establishing this RF environment survey facility, a broad data base of useful electromagnetic field intensity information will be developed. This, in turn, should help both the regulatory agencies and user community in terms of future frequency planning and system design by avoiding unwarranted interference. It is proposed that this experiment be flown as a future test bed during the Shuttle/Spacelab era for continuously gathering and updating information on earth-emitted electromagnetic emissions on a global scale.
    Keywords: COMMUNICATIONS AND RADAR
    Type: National Telecommunications Conference; Dec 02, 1974 - Dec 04, 1974; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Crop Production for Advanced Life Support Systems - Observations From the Kennedy Space Center Breadboard Project (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The use of plants for bioregenerative life support for space missions was first studied by the US Air Force in the 1950s and 1960s. Extensive testing was also conducted from the 1960s through the 1980s by Russian researchers located at the Institute of Biophysics in Krasnoyarsk, Siberia, and the Institute for Biomedical Problems in Moscow. NASA initiated bioregenerative research in the 1960s (e.g., Hydrogenomonas) but this research did not include testing with plants until about 1980, with the start of the Controlled Ecological Life Support System (CELSS) Program. The NASA CELSS research was carried out at universities, private corporations, and NASA field centers, including Kennedy Space Center (KSC). The project at KSC began in 1985 and was called the CELSS Breadboard Project to indicate the capability for plugging in and testing various life support technologies; this name has since been dropped but bioregenerative testing at KSC has continued to the present under the NASA s Advanced Life Support (ALS) Program. A primary objective of the KSC testing was to conduct pre-integration tests with plants (crops) in a large, atmospherically closed test chamber called the Biomass Production Chamber (BPC). Test protocols for the BPC were based on observations and growing procedures developed by university investigators, as well as procedures developed in plant growth chamber studies at KSC. Growth chamber studies to support BPC testing focused on plant responses to different carbon dioxide (CO2) concentrations, different spectral qualities from various electric lamps, and nutrient film hydroponic culture techniques.
    Keywords: Man/System Technology and Life Support
    Type: NASA/TM-2003-211184 , NAS 1.15:211184
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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