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  • 1
    Digitale Medien
    Digitale Medien
    Applications of purification reactions for minimizing reaction-generated enzyme poisoniong (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 20 (1978), S. 1249-1265 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A mathematical model has been employed to examine the interplay of reaction and mass transfer in immobilized enzyme systems involving reaction-generated enzyme poisons. Deactivation rates can be significantly reduced in some cases by catalyzing a purification reaction in which the poison is transformed into an innocuous substance. This conclusion is illustrated experimentally for reaction-generated H2O2 in a continuous-flow stirred slurry reactor containing glucose oxidase immobilized on activated carbon.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260200810
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Diffusional influences on the parametric sensitivity of immobilized enzyme catalystsNCL Communication No. 2141. (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 20 (1978), S. 1817-1831 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Immobilization of an enzyme within an insoluble material permeable to substrate can change the apparent behavior of the enzyme. In particular, external mass transfer and intraparticle diffusion effects can significantly influence the dependence of observed reaction rate on operating parameters such as temperature and pH. This analysis shows that, under very general conditions, the influence of diffusion alone is to diminish the sensitivity of the observed rate to any parameter that is uniform throughout the catalyst particle. However, the optimal value of the parameter is not changed because of intrapellet diffusional effects.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260201110
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Immobilization of enzymes on activated carbon: Properties of immobilized glucoamylase, glucose oxidase, and gluconolactonase (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 20 (1978), S. 1651-1665 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Apparent kinetics and pH-activity relationships have been determined for glucoamylase and glucose oxidase immobilized on activated carbon using a diimide method. Reaction rate expressions of Michaelis-Menten form adequately approximate the observed kinetics for both enzyme preparations over the ranges of substrate concentrations considered. Influences of external mass transfer as well as substrate and product adsorption on interpretation of the experimental data have been examined. Immobilization of a glucose oxidase-gluconolactonase enzyme mixture has been found to increase substantially the ratio of gluconolactonase to glucose oxidase activities compared to the corresponding activity ratio for these enzymes in solution.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260201011
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Measurement of structured microbial population dynamics by flow microfluorometry (1978)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 24 (1978), S. 570-577 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Commercial microbiological processes frequently contain dispersed microorganisms which are heterogeneous in their age, size, and composition. Relative protein and nucleic acid contents of individual bacteria in Bacillus subtilis submerged cultures have been measured experimentally using laser flow microfluorometry. Marginal and joint population composition density data and their complex patterns of evolution during batch growth provide an impetus and emerging basis for a new generation of potentially robust mathematical models of microbial systems.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690240403
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Copolymers of formaldehyde and acetone (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 16 (1978), S. 507-513 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1978.130161004
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  • 6
    Digitale Medien
    Digitale Medien
    Molecular orientation at the surface of an ion-exchanged sulfonated polystyrene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 16 (1978), S. 447-452 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1978.130160902
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  • 7
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    Unbekannt
    Isolation of St. Louis encephalitis virus from overwintering Culex pipiens mosquitoes (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1978-03-24
    Beschreibung: Two strains of St. Louis encephalitis virus were isolated from overwintering mosquitoes collected in Maryland and Pennsylvania during January and February 1977. There isolations from Culex pipiens constitute evidence that a mosquito-borne flavivirus can persist in a vector mosquito in temperate climates during the winter season.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bailey, C L -- Eldridge, B F -- Hayes, D E -- Watts, D M -- Tammariello, R F -- Dalrymple, J M -- New York, N.Y. -- Science. 1978 Mar 24;199(4335):1346-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/628843" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Culex/*microbiology ; Encephalitis Virus, St. Louis/*isolation & purification ; Encephalitis Viruses/*isolation & purification ; Female ; Insect Vectors/*microbiology ; Maryland ; Pennsylvania ; Seasons
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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    AKTUELLE ARTIKEL
  • 8
    facet.materialart.
    Unbekannt
    Ion temperature troughs and interhemispheric transport observed in the equatorial ionosphere (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Ion temperature and ion drift velocity data from Atmosphere Explorer D have verified the existence of interhemispheric plasma transport and ion temperature troughs in the topside equatorial ionosphere. The data were taken during solar minimum conditions at night where the exospheric temperature was typically 700 K and the O(+)-H(+) transition height was 520 km. Large field-aligned ion velocities were observed above about 700 km, where the H(+)/O(+) number density ratio was about 3. Model calculations have shown that the ion temperature decrease is produced by quasi-adiabatic expansion of the plasma, but the expansion cooling mechanism is less efficient at solar minimum than at solar maximum owing to the lower O(+)-H(+) transition height. Ion temperature troughs greater than 400 K were not observed even when the field-aligned ion velocity was greater than 700 m/s. Most of the expansion occurs below the transition height, and during sunspot minimum, thermal coupling to the neutral atmosphere is much more effective in quenching the cooling which the field-aligned transport tends to produce.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 83; Aug. 1
    Format: text
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