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  • 1
    Electronic Resource
    Electronic Resource
    Binary and ternary ion-exchange equilibriums. Sodium-cesium-manganese-Dowex 50W-X8 and cesium-manganese-strontium-Dowex 50W-X8 systems (1973)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 77 (1973), S. 1288-1293 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100629a022
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  • 2
    Electronic Resource
    Electronic Resource
    Role of Photodegradation in Pentachlorophenol Decontamination in Soils (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 665 (1992), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1992.tb42604.x
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  • 3
    Electronic Resource
    Electronic Resource
    Collisional Friction Frequency in the Ionosphere at Allahabad (1936)
    [s.l.] : Nature Publishing Group
    Nature 138 (1936), S. 37-37 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] APPLETON1 has shown that for the ordinary ray the integrated absorption coefficient k for absorption in the deviating region (that is, in the region where μ approaches zero) may be calculated from the following formula: ... where ν, the collisional friction frequency per ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/138037a0
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  • 4
    Electronic Resource
    Electronic Resource
    Lactic acid production from enzyme-thinned corn starch usingLactobacillus amylovorus (1991)
    Springer
    Journal of industrial microbiology and biotechnology 7 (1991), S. 27-34 
    Details
    ISSN: 1476-5535
    Keywords: Bacterium ; Fermentation ; Nutrition ; Optimization ; Liquefaction ; High-substrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary An alternative process for industrial lactic acid production was deveooped using a starch degrading lactic acid producing organism,Lactobacillus amylovorus B-4542. In this process, saccharification takes place during the fermentation, eliminating the need for complete hydrolysis of the starch to glucose prior to fermentation. The cost savings of this alternative are substantial since it eliminates the energy input, separate reactor tank, time, and enzyme associated with the typical pre-fermentation saccharification step. The only pre-treatment was gelatinization and enzyme-thinning of the starch to overcome viscosity problems associated with high starch concentrations and to make the starch more rapidly degradable. This fermentation process was optimized for temperature, substrate level, nitrogen source and level, mineral level, B-vitamins, volatile fatty acids, pH, and buffer source. The rate of the reaction and the final level of lactic acid obtained in the optimized liquefied starch process was similar to that obtained withL. delbrueckii B-445 using glucose as the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575599
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of early social deprivation on rhesus monkeys: Social responsiveness (1980)
    Springer
    Primates 21 (1980), S. 510-514 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twelve rhesus infants were subjected to early total social deprivation in a free-ranging environmental situation for the periods of 6, 12, and 18 months. After the termination of treatment at the end of each period, a group of four subjects was tested for social responsiveness with six stimulus animals belonging to both the sexes and three age groups. Responses of the subjects were compared with similarly tested, naturally reared controls. Purpose of the experiment was to separate the effect of social deprivation from that of physical restrictions which had confounded the results of earlier experiments. It is concluded that the deficit in social responsiveness indicated by quantitative measures should be interpreted in the light of qualitative observations. Subjects were found deficit in “social communication” and “social manners” that interfered with social interactions. It is suggested that appropriate social experience enabling the subjects to learn social communication should benefit them as they possess primary social response tendencies to an appreciable degree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373839
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  • 6
    Electronic Resource
    Electronic Resource
    Pulmonary clearance of Candida albicans: Effect of exposure to native and metal-coated fly ash (1996)
    Springer
    Mycopathologia 135 (1996), S. 103-108 
    Details
    ISSN: 1573-0832
    Keywords: Fly ash ; C. albicans ; macrophages ; phagocytosis ; intracellular killing ; heavy metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The viability of Candida albicans was tested at various intervals in the lungs of rats following single intratracheal inoculation of the yeast cells. Most of the inoculated cells were cleared from lungs within 48 hr after exposure. Clearance was enhanced in lungs exposed to metal-coated fly ash than in those exposed to native fly ash. The validity of these studies was verified in vitro using peritoneal macrophages of mice exposed in vivo to native and metal-coated fly ash. An increase in phagocytic and intracellular killing of macrophages harvested from animals exposed to native or metal-coated fly ash was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00436459
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  • 7
    Electronic Resource
    Electronic Resource
    Dispersions in hydrocarbon fermentation. A retrospective study (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 541-556 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A nondimensionalized plot, obtained by normalizing the drop-size distribution in the hydrocarbon phase using the Sauter mean diameter, shows a tendency towards self-preservation of the distribution. Changes of distribution in time during the course of fermentation, initial dispersed phase fraction, speed of rotation, and reactor size were taken into account. Using this self-preserving property, an empirical (single parameter) equation has been proposed for drop-size distribution. Data, available from the literature, are presented for non-biological and biological systems (gas-oil, n-hexadecane, and n-hexadecane dissolved in dewaxed gas oil as dispersed phases). The parameter, Sauter mean diameter, has been correlated with the operating conditions, and a critical review presented. Cell density was found to have significant effect on Sauter mean diameter. This effect has also been empirically explained. The possibilities of using generalized distribution in predicting the performance of fermenters is outlined.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170407
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluation of feeding strategies in carbon-regulated secondary metabolite production through mathematical modeling (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 717-738 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There is now growing evidence that the production of many secondary metabolic by microorganisms is subjected to carbon-catabolite regulation. Even though the exact mode of this regulation is not yet clear, an engineering analysis of the production process is still possible based upon a suitable hypothesis. By way of simulation of penicillin fermentation data obtained from the literature, a mechanistic model involving a substrate inhibition kinetics of product formation has been verified in this paper. Such a model has been found successful not only in predicting simple sugar-feeding strategy, but also a complicated computer guided strategy based upon controlling biomass growth rates in the tropo and idiophases. Using this model, for strategies for sugar feeding into penicillin fermentation have been investigated. These results show that similar penicillin productivities can be obtained using any of these strategies provided fermentations are carried out under optimal conditions corresponding to the strategy chosen. Effect of maximum oxygen transfer capacity of the fermentor under the conditions of fungal growth has been incorporated using an upper limit of biomass concentration on achievement of which the fermentations must be stopped due to serious oxygen limitations. Results of model simulations with such limits throw light upon the way in which different fermentors may behave with respect to product formation.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260230406
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  • 9
    Electronic Resource
    Electronic Resource
    A new method for measuring drop-size distribution in hydrocarbon fermentations (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 16 (1974), S. 1557-1564 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260161114
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of drop interactions on the performance of hydrocarbon fermentors (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 19 (1977), S. 1761-1772 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A drop-interaction model devised by the authors, which successfully predicts experimentally observed drop-size distributions in stirred batch vessels, has been used to assess the importance of droplet coalescence and redispersion in hydrocarbon fermentation yields. Calculations, which have been made with both n-alkane and gas-oil fermentations, have been compared with previous calculations based on simpler and, hence, less realistic droplet interaction mechanisms. The comparison shows that the differences in yield are not spectacularly different.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260191203
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