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  • 1
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    Chemical, Anatomical, and Histochemical Studies on the Navy Bean Seed 1 (1960)
    Wiley
    Details
    Publication Date: 1960-03-01
    Print ISSN: 0002-1962
    Electronic ISSN: 1435-0645
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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    PAPER CURRENT
  • 2
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    Microorganisms on Mars (1967)
    American Association for the Advancement of Science
    Details
    Publication Date: 1967-06-16
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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    PAPER CURRENT
  • 3
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    Environmental microbiology as related to planetary quarantine (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Continued experimental work related to dry heat resistance of microorganisms. One phase of this research has been concerned with the viability and dry heat resistance of indigenous microflora associated with small soil particles. The second part of this report is an analysis of the present status of dry heat sterilization. An attempt is made to integrate results for both laboratory grown spores and spores in soil.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-142933 , SAPR-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Sterilization of space hardware. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Discussion of various techniques of sterilization of space flight hardware using either destructive heating or the action of chemicals. Factors considered in the dry-heat destruction of microorganisms include the effects of microbial water content, temperature, the physicochemical properties of the microorganism and adjacent support, and nature of the surrounding gas atmosphere. Dry-heat destruction rates of microorganisms on the surface, between mated surface areas, or buried in the solid material of space vehicle hardware are reviewed, along with alternative dry-heat sterilization cycles, thermodynamic considerations, and considerations of final sterilization-process design. Discussed sterilization chemicals include ethylene oxide, formaldehyde, methyl bromide, dimethyl sulfoxide, peracetic acid, and beta-propiolactone.
    Keywords: BIOTECHNOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Environmental microbiology as related to planetary quarantine (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The experiments carried out to determine the effects of temperature and relative humidity on the survival rate of Bacillus subtillis var. niger spores are reported. The experiments were conducted in environmental chambers at temperatures of 75 and 90 C. Data are also included on the survival characteristics of the spores suspended in sucrose solutions at 90 C with water activities of 0.99, 0.9, and 0.85
    Keywords: BIOSCIENCES
    Type: NASA-CR-123326 , SAPR-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Dry-heat resistance of selected psychrophiles (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The dry-heat resistance characteristics of spores of psychrophilic organisms isolated from soil samples from the Viking spacecraft assembly areas at Cape Kennedy Space Flight Center, Cape Canaveral, Fla., were studied. Spore suspensions were produced, and dry-heat D values were determined for the microorganisms that demonstrated growth or survival under a simulated Martian environment. The dry-heat tests were carried out by using the planchet-boat-hot plate system at 110 and 125 C with an ambient relative humidity of 50% at 22 C. The spores evaluated had a relatively low resistance to dry heat. D (110 C) values ranged from 7.5 to 122 min, whereas the D (125 C) values ranged from less than 1.0 to 9.8 min.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Applied and Environmental Microbiology; 34; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of combined heat and radiation on microbial destruction (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A series of experiments at several levels of relative humidity and radiation dose rates was carried out using spores of Bacillus subtilis var. niger to evaluate the effect of heat alone, radiation alone, and a combination of heat and radiation. Combined heat and radiation treatment of microorganisms yields a destruction rate greater than the additive rates of the independent agents. The synergistic mechanism shows a proportional dependency on radiation dose rate, an Arrhenius dependence on temperature, and a dependency on relative humidity. Maximum synergism occurs under conditions where heat and radiation individually destroy microorganisms at approximately equal rates. Larger synergistic advantage is possible at low relative humidities rather than at high relative humidities.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Applied and Environmental Microbiology; 33; May 1977
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Environmental microbiology as related to planetary quarantine Semiannual progress report, 1 Jun. 1970 - 30 Nov. 1970 (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Application of environmental microbiology to spacecraft quarantine procedures
    Keywords: BIOSCIENCES
    Type: NASA-CR-119638 , SAPR-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Environmental microbiology as related to planetary quarantine (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The experimental design of a study to evaluate the effect of different cleaning methods and storage conditions on the dry heat resistance of Bacillus subtilis var. niger spores is described and the results for the first evaluation are reported. Specifically, the synergistic effect which occurs when spores are subjected simultaneously to dry heat and gamma radiation so as to be able to specify thermoradiation sterilization cycles was investigated. Attempts were made to understand the underlying mechanism(s) that lead to spore death from this combination of stresses. Data cover: (1) the survival of spores on surfaces at various temperatures in a precisely controlled environmental system, (2) the rate of destruction of these spores at ambient temperature when subjected to gamma radiation, and (3) the rate of destruction of spores when they are subjected to combined gamma radiation and thermal stresses.
    Keywords: BIOSCIENCES
    Type: NASA-CR-138002 , SAPR-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Environmental microbiology as related to planetary quarantine (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The mechanistic basis of the synergetic effect of combined heat and radiation on microbial destruction was analyzed and results show that radiation intensity, temperature, and relative humidity are the determining factors. Dry heat resistance evaluation for selected bacterial spore crops indicates that different strains of Bacillus stearothermophilus demonstrate marked differences in resistance. Preliminary work to determine the effects of storage time, suspending medium, storage temperature and spore crop cleaning procedures on dry heat survival characteristics of Bacillus subtilis var. Niger, and dry heat resistance of natural microflora in soil particles is also reported.
    Keywords: SPACE BIOLOGY
    Type: NASA-CR-140941
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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