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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 1013-1015 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The seeds, leaves, and stem of velvet bean (Stizolobium aterrimum) contained high concentrations of L-DOPA and polyphenol oxidase. Polyacrylamide-gel electrophoresis revealed three polyphenol oxidase isoenzymes in the seeds of velvet bean, two in the leaves and stem. All isoenzymes were active with o-diphenols such as catechol, caffeic acid, d-catechin and L-DOPA. L-Tyrosine was not active to the isoenzymes. Polyphenol oxidase semipurified by ammonium sulfate fractionation exhibits a smaller Km for L-DOPA than other substrates.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Numerous microorganisms were screened for d-glucose isomerizing activity from soil by this laboratory. It was found that a strain of Streptomyces bikiniensis produced high activity of glucose isomerase in culture medium containing xylose or xylan as inducer. The cell bound glucose isomerase was prepared using cells of S. bikiniensis. The cell bound enzyme also efficiently catalyzes the isomerization of d-xylose and d-ribose and to a lesser extent L-rhamnose and d-arabinose to their respective ketoses. Isomerization of glucose to fructose by the enzyme was stimulated most effectively by Mg2+ and CO2+ combined or singly, and slightly by Mn2+. Cobalt and Mg2+ also inhibited thermal denaturation of the enzyme. The optimum pH for the enzyme was between 8 and 9, and optimum temperature was found to be 80°C. The enzyme is highly thermostable. The cell bound glucose isomerase was examined for isomerization of glucose to fructose in a batch system by incubating a mixture of the enzyme and various concentrations of glucose in 0.05M phosphate buffer, pH 7.2 containing 5 mM MgSO4 and 0.5 mM CoCl2 at various temperatures. It was found that maximum isomerization of glucose to fructose (50%) was reached when optimum concentration of enzyme and substrate was incubated at 70°C for 70 hr. The cell bound enzyme can be recovered after the operation and used for successive operations.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 40 (1975), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A strain of Aspergillus oryzae producing extracellular β-galactosidase that hydrolyzes lactose in whey and dairy products was selected. The crude lactase concentrates were prepared by both semisolid and submerged fermentation. Yields of the enzyme from semisolid fermentation were much higher than submerged fermentation. The crude enzyme hydrolyzed lactose efficiently in acid whey and 83% lactose hydrolysis was obtained at 55°C. However, the activity of the crude enzyme is greatly reduced in cow's milk. A. oryzae lactase was purified by ammonium sulfate fractionation, chromatography on DEAE-cellulose, chromatography on CM-cellulose, and DEAE-Sephadex A-50 column chromatography. The purified enzyme had an optimum pH of 5. The optimum temperature was 5°C, whereas, for the crude enzyme preparation, it was 55°C. The pH stability of the enzyme was between 3.5 and 8.0 at room temperature for overnight. The Michaelis constant is 0.77 mM for o-nitrophenyl-p-D-galactopyranoside (ONPG) and 50 mM for lactose. The values of Vmax are 55.6 μg/min/mg of protein for ONPG and 2.4 μg/min/mg for lactose. Metal ions in the range 0.01-l mM and sulfhydryl reagent (0.01–0.1 mM of p-chloromercuribenzoate) have no effect on the enzyme activity. Galactose inhibited competitively the enzyme activity, whereas glucose did not.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 555-557 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The rates of chemical reactivity (kR) and physical quenching (kQ) of singlet oxygen by bilirubin IXα, mesobilirubin IXα, bilirubin IXα dimethyl ester, aetiobilirubin IVγ, biliverdin IXα, biliverdin IXα dimethyl ester, aetiobiliverdin IVγ and an oxodipyrromethene have been determined. The kR and kQ values approach the diffusion threshold for the bilirubin-like substrates, but kR〈kQ by about a factor of 103 for the verdins. A reaction mechanism involving superoxide ion is suggested. Bilirubin appears to quench singlet oxygen by an electron-transfer mechanism.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 50 (1977), S. 153-161 
    ISSN: 1432-2242
    Keywords: Gene Number ; Estimation of Gene Number ; Variance of the Estimation of Gene Number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A general expression for gene number estimation which encompasses the conventional formula was derived. It provides a basis for gene number estimation from the data of recurrent selection experiments that are not of sufficient duration to measure total response to selection. Gene number estimates are considerably more reliable when heritability is high. The effect of heritability on sampling variance is particularly important when gene number is large. Generally the most effective ways of decreasing the variance of a gene number estimate will be 1) to increase the number of generations in a primary selection program, 2) to increase the number of generations in the two way selection program and 3) to increase population size.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 50 (1977), S. 163-172 
    ISSN: 1432-2242
    Keywords: Biases ; Drift ; Inequality of Gene Effects ; Linkage Disequilibrium ; Epistasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Bias in the estimation of gene number from a population of finite size will be reduced when the number of generations and the selection differential in the primary selection program are increased. A procedure to minimize bias due to dominance is proposed. Bias due to linkage disequilibrium is decreased by long generations of selection and small change of linkage disequilibrium. Bias due to inequality of gene effects was studied assuming that gene effects follow a half normal distribution. The epistatic bias arising from multiplicative gene effects disappears when the logarithms of the original measurements are considered even though the gene number estimate is unsatisfactory without transformation.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Semigroup forum 17 (1979), S. 189-199 
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 17 (1979), S. 195-201 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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