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  • ASTROPHYSICS  (3)
  • coal solubilization  (1)
  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of coal solubilization by bacteria and fungi (1994)
    Springer
    Biodegradation 5 (1994), S. 55-62 
    Details
    ISSN: 1572-9729
    Keywords: ammonia ; bacteria ; chelation ; coal solubilization ; fungi ; oxalate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Coal-solubilizing agents produced byTrametes versicolor, Phanerochaete chrysosporium, Aspergillus sp., a bacterial consortium, and a bacterial isolate,Arthrobacter sp., from that consortium were compared in terms of pH dependence, thermostability, molecular mass, mechanism of action, and product diversity. The thermostability and low molecular weights exhibited by the coal-solubilizing agents indicated a non-enzymatic mechanism of action. Competition studies using cupric copper indicated that coal solubilization by these agents involved metal chelation. Results demonstrated that oxalate could account for some but not all of the coal solubilization observed forT.versicolor andP.chrysosporium. The very low levels of oxalate detected inAspergillus sp. and the bacterial cultures indicated that oxalate is not an important factor in coal solubilization by these microbes. When subjected to gel permeation chromatography, the soluble coal products generated by each microbial coal-solubilizing agent yielded unique molecular mass profiles suggesting substantial product diversity. Such diversity increases the possibility of identifying potentially valuable compounds and extending the commercial utilization of coal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695214
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A spectrum synthesis program for binary stars (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new program produces synthetic spectra of binary stars at arbitrary values of orbital longitude, including longitudes of partial or complete eclipse. The stellar components may be distorted, either tidally or rotationally, or both. Either or both components may be rotating nonsynchronously. We illustrate the program performance with two cases: EE Peg, an eclipsing binary with small distortion, and SX Aur, an eclipsing binary that is close to contact.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 434; 2; p. 738-746
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A light synthesis study of W Ursae Majoris (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A common set of Roche model parameters produces an accurate fit to I, V, and B data for W Ursae Majoris. The R data are defective. Two pairs of cool photospheric starspots are adopted in producing the fit. The model also adopts the cross-correlation radial velocity obtained by McLean and satisfactorily eliminates evidence, cited in the literature, for a third body in the system. Changing starspot longitudes, while maintaining fixed angular diameter, latitude, and temperature contrast from the adjacent photosphere, can simulate all of the types of light curve instability recorded in historical W Ursae Majoris light curves. Although the theoretical curve accurately fits primary minimum in U, the theoretical curve is too shallow at secondary minimum. A hot secondary explanation of W-type light curves, rather than starspots on an otherwise barotropic photosphere is argued.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 374; 307-318
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Does SV Centauri harbor an accretion disk? (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Light synthesis simulation of SV Cen UBV photometry by Drechsel et al. (1982) exhibits appreciable residuals. These residuals, together with large Roche model overcontact but also large calculated intercomponent temperature difference, suggests that the light synthesis Roche model is inapplicable. The substantial rate of period change indicates rapid mass transfer in a pre-mass-reversal system. An accretion disk surrounding a nearly normal size secondary provides a possible explanation of the photometric residuals. Excess radiation longward of 200 nm, by comparison with a spectrum synthesis simulation, provides qualitative support for the model. This model is inconsistent with the Lubow-Shu criterion for accretion disk formation. The text provides a speculative scenario showing why an accretion disk may nonetheless form.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 379; 721-728
    Format: text
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    NASA TECHNICAL REPORTS
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