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  • LIFE SCIENCES (GENERAL)  (1)
  • bioassay  (1)
  • 1990-1994  (2)
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  • 1
    ISSN: 1572-9729
    Keywords: analytical chemistry ; bioassay ; biochemistry ; composition ; hydrocarbons ; remediation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Bioremediation of petroleum-contaminated sites is expected to be a cost-effective remediation technology. However, many potential users of the technology expect the reliability of this technology to be similar to other candidate technologies for widespread consideration. In particular, candidate technologies should possess the property of reliable experimental linkage — there should be reasonable confidence that experiments done at one scale can be reliably related to another. An important example is bench-scale treatability studies that should result in linkages with commercial-scale operations. In this respect comparison of bioremediation to other candidate technologies reveals that bioremediation is in an early stage of its evolution. It is being pursued at a variety of sites and scales with practitioners from a variety of disciplines. Integration of activities between disciplines and an ability to quantitatively compare results at different sites and scales is proceeding. This paper addresses a number of physical, chemical, biological, analytical, and statistical issues regarding the successful comparison of results between experiments.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-06-28
    Description: The Biomass Production Chamber at Kennedy Space Center was constructed to conduct large scale plant growth studies for NASA's CELSS program. Over the past four years, physical systems and computer control software have been continually upgraded and the degree of atmospheric leakage from the chamber has decreased from about 40 to 5 percent of the total volume per day. Early tests conducted with a limited degree of closure showed that total crop (wheat) growth from the best trays was within 80 percent of reported optimal yields for similar light levels. Yields from subsequent tests under more tightly closed conditions have not been as good--up to only 65 percent of optimal yields. Yields appear to have decreased with increasing closure, yet potential problems exist in cultural techniques and further studies are warranted. With the ability to tightly seal the chamber, quantitative data were gathered on CO2 and water exchange rates. Results showed that stand photosynthesis and transpiration reached a peak near 25 days after planting, soon after full vegetative ground cover was established. In the final phase of testing when atmospheric closure was the highest, ethylene gas levels in the chamber rose from about 10 to nearly 120 ppb. Evidence suggests that the ethylene originated from the wheat plants themselves and may have caused an epinastic rolling of the leaves, but no apparent detrimental effects on whole plant function.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA-TM-103494 , NAS 1.15:103494
    Format: application/pdf
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