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  • 1
    Electronic Resource
    Electronic Resource
    Nodulation of Trifolium repens at low pH by single and paired strains of Rhizobium leguminosarum biovar trifolii (1997)
    Springer
    Archives of microbiology 168 (1997), S. 193-198 
    Details
    ISSN: 1432-072X
    Keywords: Key words Competition ; Nodulation ; Rhizobium ; leguminosarum bv. trifolii ; Trifolium repens ; Acidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Detailed individual nodulation profiles were obtained for five strains of Rhizobium leguminosarum biovar trifolii inoculated onto roots of Trifolium repens seedlings growing on an agar medium of pH 4.5. The time of appearance and the location of every nodule were noted for a period of 10 days after inoculation. Using these nodulation frequency profiles, pairings of strains were identified and six mixed-strain inoculation (1:1 ratio) experiments were subsequently performed at pH 4.5. Results from the mixed-inoculum experiments showed that the performance of a Rhizobium strain in single culture could not be reliably used to predict the outcome of a paired-inoculation study and that some seedlings were exclusively nodulated by rhizobia that performed poorly at low pH in single-culture inoculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050487
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    Paper (German National Licenses)
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  • 2
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    Asteroid selection for mission opportunities (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study to assess the present state of knowledge of asteroids as well as the rate of change of that knowledge to better identify the mission and target priorities for advanced planning of asteroidal flights in the 1980's is presented. Topics discussed include; the present state of asteroid knowledge, the scientific goals and priorities attached to asteroid exploration, the anticipated advances in knowledge over the current decade, asteroid mission consideration, and asteroid selection. Data sheets for 118 asteroids are contained. These are asteroids for which some data is available over and above orbital parameters and magnitude.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-129247 , P-42
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ferromagnetic resonance intensity - A rapid method for determining lunar glass bead origin (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ferromagnetic resonance intensity, I(s), relies on the absence or presence of single-domain Fe formed during impact melting by autoreduction of Fe(2+) in the melt to distinguish volcanic from impact glass spherules in the lunar soil. SEM inspection of individual glass bead surfaces gave reliable evidence of the mode of glass genesis. Ferromagnetic resonance intensity was tested against the Apollo 15 and 17 volcanics. I(s) values of less than one were found in 94% of the volcanic glasses, implying the absence of single-domain Fe, while 75% of the impact glasses had elevated I(s) values. These samples lack single-domain Fe, and may represent impact melts of bedrock with little or no regolith contribution. Both the primary discrimination of volcanic and impact glasses, and the secondary one of bedrock-derived impact melts from impact melts partially or entirely derived from regolith, have been demonstrated for the I(s) technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Cost estimation for unmanned lunar and planetary programs (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A basic model is presented for estimating the cost of unmanned lunar and planetary programs. Cost data were collected and analyzed for eight lunar and planetary programs. Total cost was separated into the following components: labor, overhead, materials, and technical support. The study determined that direct labor cost of unmanned lunar and planetary programs comprises 30 percent of the total program cost. Twelve program categories were defined for modeling: six spacecraft subsystem categories (science, structure, propulsion, electrical power, communications, and guidance and integration, test and quality assurance, launch and flight operations, ground equipment, systems analysis and engineering, and program management). An analysis showed that on a percentage basis, direct labor cost and direct labor manhours compare on a one-to-one ratio. Therefore, direct labor hours is used as the parameter for predicting cost, with the advantage of eliminating the effect of inflation on the analysis.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-131897 , C-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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