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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and proteolytic activation of chitin synthetase in Phycomyces blakesleeanus Burgeff (1978)
    Springer
    Archives of microbiology 116 (1978), S. 181-184 
    Details
    ISSN: 1432-072X
    Keywords: Phycomyces ; Chitin synthetase ; Germination ; Proteolytic activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chitin synthetase of Phycomyces blakesleeanus mycelium is a particulate enzyme sedimenting mostly at 1000xg. The activity in crude extracts or cellular fractions can be increased more than tenfold by mild trypsin treatment. Plotting the reaction velocity versus UDP-N-acetylglucosamine concentration yields a sigmoidal curve. N-acetylglucosamine, which greatly stimulates the enzyme, changes the kinetics to an almost normal hyperbolic relationship. The enzyme is nearly absent in dormant spores and is synthesized “de novo” in germinating spores (from 4 h germination on). Trypsin treatment of extracts from germinating spores to assay the synthesis of the proenzyme did not reveal an earlier synthesis of the zymogen, which therefore might have some activity of its own.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406034
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Density changes of Phycomyces spores after reversible and irreversible activation (1980)
    Springer
    Archives of microbiology 124 (1980), S. 289-291 
    Details
    ISSN: 1432-072X
    Keywords: Phycomyces ; Spores ; Germination ; Activation ; Density gradient centrifugation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spores harvested by conventional methods could be cleaned up considerably using discontinuous density gradients. This method yielded a population of almost entirely viable spores. Germination of the spores resulted in density changes probably due to spore swelling. These changes could be observed as early as 15 min after activation. The usefulness of this method in the study of spore activation was shown by its application to spores germinating after a heat treatment at various temperatures, or to spore reacquiring dormancy by incubation in water after activation at different temperatures. Dormant and activated spores can quickly and easily be separated from mixed populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427740
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Particle collection in magnetically stabilized fluidized filters (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 288-295 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A study was conducted on the use of magnetically stabilized fluidized (MSF) filters for removing fine particles from gases. The effect on filter performance of a number of variables was examined, including the applied field strength, gas velocities, and bed height. The dynamic behavior of MSF filters was found to be characterized by a decreasing collection efficiency with time as a result of significant particle re-entrainment.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690310216
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of calcium carbonate and paraffin wax levels on the performance of PVC pipe (1983)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 5 (1983), S. 100-103 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: PVC pipe compounds typically contain varying amounts and types of calcium carbonates, paraffin waxes, and other ingredients such as stabilizers, titanium dioxide, calcium stearate, and processing aids. The purpose of this paper is to study the effect of calcium carbonate particle size, coating, and usage level on the properties of PVC pipe. In addition, the effects of varying the paraffin wax level and melt temperature will be explored. The paper describes these effects as a function of both impact strength and stress-rupture regression. Based on these results, a series of recommendations on type and usage level of the calcium carbonates and paraffin waxes, and processing conditions for the compound will be developed for use in guiding the pipe manufacturer towards producing PVC pipe that is both performance-oriented and cost-effective.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730050306
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    Paper (German National Licenses)
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