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  • 1
    Electronic Resource
    Electronic Resource
    On a possible mechanism of the formation of large-scale disturbances in Jupiter’s atmosphere as a result of the falling of fragments of Comet Schoemaker-Levy 9 (1996)
    Springer
    JETP letters 63 (1996), S. 813-817 
    Details
    ISSN: 1090-6487
    Keywords: 96.50.Gn ; 97.10.Ex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A mechanism explaining the sizes and structure of large-scale disturbances produced in Jupiter’s atmosphere by the impact of the fragments of Comet Shoemaker-Levy is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567096
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  • 2
    Electronic Resource
    Electronic Resource
    Microbiological Processes of the Carbon and Sulfur Cycles at Cold Methane Seeps of the North Atlantic (2000)
    Springer
    Microbiology 69 (2000), S. 709-720 
    Details
    ISSN: 1608-3237
    Keywords: methane seeps ; bacterial mats ; filamentous bacteria ; sulfate reduction ; methanogenesis ; methane oxidation ; pogonophoras ; methanotrophic endosymbiotic bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Functioning of microbial communities in surface sediments of the Haakon Mosby underwater mud volcano (lat. 72°N) and in gas seepage fields of the Vestnesa Ridge was investigated using Mir-1 and Mir-2 deep-sea submersibles during the 40th voyage of the research vessel Academician Mstislav Keldysh. Large areas of sedimentary deposits of the Haakon Mosby mud volcano (HMMV) and pockmarks of the Vestnesa Ridge (VR) are covered with bacterial mats 0.1 to 0.5 cm thick. The microbial community making up bacterial mats of the HMMV was dominated by large filamentous bacteria with filaments measuring up to 100 μm in length and 2 to 8 μm in width. The occurrence of rosettes allowed the observed filamentous bacteria to be referred to the morphologically similar genera Leucothrix or Thiothrix. Three morphological types of filamentous bacteria were identified in bacterial mats covering VR pockmarks. Filaments of type one are morphologically similar with representatives of the genera Thioploca or Desmanthos. Type two filaments had numerous inclusions of sulfur and resembled representatives of the genus Thiothrix. The third morphological type was constituted by single filaments made up of tightly connected disk-like cells and can be assigned to the genus Beggiatoa. The rates of methane oxidation (up to 1570 μl C/(dm3 day)) and sulfate reduction (up to 17 mg S/(dm3day)) measured in the surface sediments of HMMV and VR were close to the maximum rates of these processes observed in heavily polluted regions of the northwestern shelf of the Black Sea. High rates of microbiological processes correlated with the high number of bacteria. The rate of methane production in sediments studied was notably lower and ranged from 0.1 to 3.5 μ CH4/(dm3 day). Large areas of the HMMV caldera were populated by pogonophoras, represented by the two species Sclerolinum sp. and Oligobrachia sp. The mass development of Sclerolinum sp. in the HMMV caldera was by the activity of aerobic methane-oxidizing bacteria localized inside the cells of these animals. Bacterial cells were also found in the trophosome tissue of Oligobrachia sp., but in cells of these bacteria, we did not observe the membrane structures typical of methanotrophs. The localization pattern of pogonophoras on the surface of reduced sediments suggests that the predominant bacteria in Oligobrachia tissues are sulfur-oxidizing endosymbionts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026666527034
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  • 3
    Electronic Resource
    Electronic Resource
    Rapid x-ray diffraction technique for determination of crystallinity of cellulosic materials (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2353-2357 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Predominant orientation or texture of cellulosic materials leads to the overestimation of the contribution from crystalline fractions when x-ray diffraction techniques are used for determination of crystallinity of these materials. Therefore it was attempted to determine the fraction of noncrystalline cellulose on the diffractomer by using a recalculating instrument to measure the scattering power at an angle 2θ = 32° from cellulose tablets, and by comparing these result with a reference sample. The method is convenient for process control procedures.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070190901
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the kinetics of anionic copolymerization of ε-caprolactam and ω-dodecalactam (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 727-731 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kinetik der anionischen Copolymerisation von ε-Caprolactam und ω-Dodecalactam wird diskutiert. Die Temperaturbereiche der Copolymerisation mit bzw. ohne gleichzeitige Kristallisation der Copolyamide werden bestimmt. Die Enthalpie der Copolymerisation wird berechnet. Jedes Monomer trägt additiv zum summarischen Wärmeeffekt der Copolymerisation bei. Auf Grund der Ergebnisse wird eine Methode zur Bestimmung der Copolymerzusammensetzung aus den Wämeeffekten unter Berücksichtigung der Kristallisationswärme vorgeschlagen.
    Notes: The kinetics of the anionic copolymerization of ε-caprolactam and ω-dodecalactam is discussed. The temperature regions of copolymerization with and without simultaneously occuring crystallization are determined. The enthalpy of copolymerization is calculated. The heat effect of each monomer was found to contribute additively to the overall heat of copolymerization. Based on the results obtained a method for determining the copolymer composition from the heat effects is proposed, considering the effects of crystallization.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010341112
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    Paper (German National Licenses)
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