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  • Analytical Chemistry and Spectroscopy  (3)
  • Biochemistry and Biotechnology  (2)
  • 1980-1984  (5)
  • 1
    Electronic Resource
    Electronic Resource
    A kinetic equation for hydrolysis of polysaccharides by mixed exo- and endoenzyme systems (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 1393-1398 
    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: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260230618
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Immobilization of Nitrosomonas europaea cells with polyelectrolyte complex (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 1591-1603 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cell immobilization with polyelectrolyte complex prepared from strongly polyacidic and polybasic ions was investigated for cells from Nitrosomonas europaea (ATCC 25978). Trimethylammonium glycol chitosan (TGCI) and potassium poly(vinyl-alcohol) sulfate (KPVS) were used. The immobilization was carried out by directly mixing both polymer solutions with the culture broth: An excess of TGCI was first added to the culture broth to aggregate the cells, and then KPVS was added to form the complex with the excess TGCI and to entrap the aggregates with the resulting complex. From physiocochemical studies on the cell aggregation, the mechanism can be interpreted in terms of the adsorption of polyion caused by the salt linkages of the ionizable groups on the cell surface. The result of an electron microscopic observation showed that the cells are situated in the pores and on the surface of the complex support. When the immobilized cells were incubated in a medium buffered by phosphate and containing ammonium sulfate, a considerable amount of nitrite was formed; this was shown to be caused by the entrapped cells and also those cells released from the support and grown in the medium. The ammonia-oxidizing activity was retained even after a total of 200 h of incubation in a batch reactor. No deformation of the complex support was observed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240712
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Geographical variations in the carbon isotope composition of the diet and hair in contemporary man (1982)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1982), S. 390-394 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Geographic variations in the carbon isotope composition of the human diet and human hair were investigated. The carbon isotopic composition of common foodstufls purchased in Chicago, USA, Tokyo, Japan and Munich, FRG, were determined by combustion and differential isotope ratio mass spectrometry. The dietary protein carbon for the United States (-18.1‰) was calculated to be enriched in 13C relative to the Japanese (-21.2‰) and the German (-23.6‰) diets. To a large degree, the differences reflected the consumption of corn-fed animal products in the United States and Japan, as well as seafood in Japan. The carbon isotopic composition of hair (-16.4, -18.0 and -20.4%) for the three respective populations correlated with the calculated values of the dietary protein, but were 2-3% enriched in 13C. Changes in the isotopic composition of beard hair were shown to record the changes in dietary composition in travelers visiting the respective regions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200090906
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of metabolic fuel on the 13C/12C ratio of breath CO2 (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 557-561 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Natural differences in 13C/12C ratios of various metabolic fuels can produce systematic changes in the 13C/12C ratio of breath CO2, and therefore introduce errors into 13CO2 breath tests. To gain insight into the potential problem, we compared 13C/12C ratios of plasma macronutrients to those of breath CO2 under conditions that should alter the percentages of carbohydrate and lipid being oxidized. In rats, 48 h of starvation decreased the 13C/12C ratio of breath CO2 by 3.5‰. At this time the 13C/12C ratio of breath CO2 was very similar to that of plasma lipids. In humans, 30 min of heavy exercise increased the breath 13CO2/12CO2 ratio by 1.3‰. These changes in breath 13C/12C ratios could be predicted from 13C/12C ratios of plasma macronutrients and the percentage of carbon dioxide derived from each macronutrient, but only when compared within the same populations. For example, the 13C/12C ratios of plasma macronutrients of residents of Chicago, Illinois (USA) and Tokyo (Japan) differed by 1-3‰. An empirical correction of 13CO2 breath test data is recommended when breath tests are run under conditions that will change metabolic fuel utilization.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200111103
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  • 5
    Electronic Resource
    Electronic Resource
    Relationship between the reciprocal of analyte--line intensity and the reciprocal of weight fraction and its utilization in x-ray fluorescence analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 176-183 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Using the effective wavelength concept, it is derived theoretically that the reciprocal of the analyte-line intensity is linearly correlated with the reciprocal of the weight fraction of the analyte. This linear relationship is substantiated experimentally in some liquid and fusion product samples. Two ways of application of the relationship in X-ray fluorescence analysis and their advantages are also described. It is emphasized that if the relationship is used the construction of calibration curves is not required.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090407
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