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  • Biochemistry and Biotechnology  (250)
  • Physical Chemistry  (59)
  • Wiley-Blackwell  (309)
  • 1985-1989  (309)
  • 1
    Electronic Resource
    Electronic Resource
    Vanadium containing bromoperoxidase: An example of an oxidoreductase with high operational stability in aqueous and organic mediaSend all correspondence to Ms. G. E. E. van Noppen, F.I.L., Publications Secretary, Laoratory of Biochemistry, University of Amsterdam, P.O. Box 20151, 1000 HD Amsterdam, The Netherlands. (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 607-610 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The conversion is described of phenolsulphonephtalein (phenol red) to 3,3′,5,5′-tetrabromophenolsulphonephthalein (bromophenol blue) by bromoper-oxidase from the brown alga Ascophyllum nodosum. This reaction provides a convenient assay for the detection of bromoperoxidase activity in vitro. Bromoperoxidase was shown to be stable under turnover conditions for three weeks at room temperature, catalyzing the bromination of phenol red into bromophenol blue. When stored at room temperature in organic sol vents such as acetone, methanol, ethanol [present up to 60% (v/v)], and 1-propanol [40% (v/v)], bromoperoxidase was stable for more than one month. As far as we know this is the first example of an oxidoreductase which displays such great stability. This enhances the applicability of the enzyme in organic synthesis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300504
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  • 2
    Electronic Resource
    Electronic Resource
    Generation of ground electronic state haloalkyl radicals in the gas phase (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 18 (1986), S. 639-649 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Gaseous haloalkyl radicals were prepared by the photolysis of iodohaloalkanes in Pyrex vessels containing mercury (I) halides. Cleavage of the carbon-iodine bond gave mercury (II) halide and a radical which was subsequently shown to react on the ground state electronic energy surface. The usefulness of this method for chemical activation rate constant studies is illustrated by measurement of unimolecular rate constants for decomposition of CH2ClCH2Cl and CF3CH3. Possible mechanisms for photodecomposition of iodoalkanes in the presence of mercury (I) halides are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Room temperature rate constants for the reaction of OH with selected chlorinated and oxygenated hydrocarbons (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 18 (1986), S. 1355-1371 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study was conducted to measure the hydroxyl radical rate constants using a relative rate procedure in which the photolysis of methyl nitrite was the source of OH. During the course of this study, the OH rate constant was measured for a number of chlorinated solvents for which measurements have not previously been reported or for which there are few reliable measurements.Room temperature OH rate constants are presented for six chlorinated hydrocarbons (allyl chloride, benzyl chloride, chlorobenzene, epichlorohydrin, trichloroethylene, and vinylidene chloride) and four oxygenated hydrocarbons (acrolein, methacrolein, methyl ethyl ketone, and propylene oxide). Also included are OH rate constants for alkanes (ethane, propane, isobutane, and cyclohexane), alkenes (trans-2-butene and isoprene), and aromatic hydrocarbons (benzene, toluene, o-, m-, and p-xylene). Rate constants for compounds not previously reported include vinylidene chloride (1.49 ± 0.21 × 10-11 cm3 molecule-1 s-1) and benzyl chloride (2.96 ± 0.15 × 10-12 cm3 molecule-1 s-1). The analysis for chlorinated hydrocarbons included a correction for possible chlorine atom reactions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550181207
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of oligosaccharides during enzymatic lactose hydrolysis and their importance in a whey hydrolysis process: Part II: Experimental (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 1026-1031 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Enzymatic lactose hydrolysis using two yeast and two fungal lactases that are of current technical interest was studied. The enzymes were compared regarding their oligosaccharide production. Parameters influencing oligosaccharide formation, together with the effect of immobilization were examined and conditions minimizing oligosaccharide content in the hydrolysis product were proposed. Enzymatic whey hydrolysis was also considered. A possibility of enzymatic lactose recombination from its hydrolysis products was shown.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300905
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  • 5
    Electronic Resource
    Electronic Resource
    Drag reducing properties of microalgal exopolymers (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 550-557 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Dilute aqueous solutions of polymers released by marine phytoplankton (microalgae) were shown to effectively reduce drag in capillary pipe flow. Tests were performed in a capillary turbulent flow viscometer which extruded small samples under high pressures. In all, 22 species were screened, and the products of one chlorophyte and four rhodophyte species proved especially effective. The viscoelastic polymers produced by these species delayed the transition from laminar to turbulent flow to significantly higher Re. In general, polymeric regime segments come off the maximum drag reduction asymptote at characteristic retro-onset points, and come to lie approximately parallel to, but displaced upwards from the Prandtl-von Karman line. The delay to transition was shown to be dependent on additive polymer concentration, capillary diameter, and temperature. Ionic concentration, ionic composition, or pH had little effect on drag reducing properties.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260330506
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  • 6
    Electronic Resource
    Electronic Resource
    Saccharification of explosively dried corn (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1159-1165 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Very rapid or explosive drying of grains such as corn leads to obvious physical changes in the macrostructure of the grain kernel, probable alteration in starch molecular structure, and reduction in starch average molecular weight. These changes lead to greater susceptibility to attack by liquefying and saccharifying enzymes. Rates of formation of nonreducing and reducing sugars by liquefying and saccharifying enzymes applied to explosively dried and milled yellow dent corn and small-kernel flint corn were 3.3-10.6 times greater than rates for the normally milled grains. The enzymatic conversion of explosively dried flint corn containing absorbed ethyl alcohol, as would be the case if it had been used as an adsorbent to dewater aqueous ethyl alcohol, was not significantly different from that of ethyl-alcohol-free flint corn.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280805
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of oligosaccharides during enzymatic lactose: Part I: State of art (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 1019-1025 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Enzymatic lactose hydrolysis by β-galactosidase (lactase) was investigated with respect to the formation of oligosaccharides. An analysis of the formation of oligosaccharides and their control is important in the development of technical applications for enzymatic lactose hydrolysis. The available literature data on transfer reactions of lactase were reviewed, compared, and presented in a concise tabular form. Mechanisms and possible ways of modelling enzymatic lactose hydrolysis, including formation of oligosaccharides, are presented.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300904
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  • 8
    Electronic Resource
    Electronic Resource
    Luminol dependent chemiluminescence and thiol group oxidation provoked by neutrophils is attributable to different oxidizing species (1987)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 1 (1987), S. 165-171 
    Details
    ISSN: 0884-3996
    Keywords: Polymorphonuclear leukocytes (PMNL) ; oxidation ; thiol groups ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Luminol-dependent chemiluminescence and thiol group oxidation of glutathione and human serum albumin were measured in order to demonstrate whether the inhibition of polymorphonuclear leukocyte chemiluminescence by albumin was attributable to thiol group oxidation. We have shown that: 1thiol groups on glutathione and albumin are oxidized by PMNL stimulated by soluble and phagocytic stimuli;2thiol group oxidation in albumin and glutathione did not correlate with the inhibitory effects of these substances on luminol-dependent chemiluminescence with respect to time course, magnitude, effects of known scavengers or extracellular activity. It was therefore concluded that thiol group oxidation was not the cause of albumin inhibition of luminol-dependent chemiluminescence;3a metastable oxidant was identified after PMNL activation which was capable of oxidizing thiol groups but unable to elicit chemiluminescence form luminol.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170010304
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  • 9
    Electronic Resource
    Electronic Resource
    Regulatory mutants of the Vibrio harveyi lux system (1989)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 3 (1989), S. 207-212 
    Details
    ISSN: 0884-3996
    Keywords: Regulatory mutants ; autoinducer ; luminescence ; Vibrio harveyi ; luciferase ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Regulatory mutants of the luminescent bacterium, Vibrio harveyi, have been isolated whose light emission can be stimulated by extracts of the growth media. Chloroform extracts of conditioned media in which V. harveyi has been grown can increase light emission in one of the dark mutants, D34, over 103-fold. An increase in the level of the mRNA and the enzymes associated with the lux system can also be demonstrated.Analysis of the expression of the lux system in Escherichia coli transformed with DNA from the D34 regulatory mutant demonstrates that the mutation resides outside the luciferase structural genes. The results suggest that the decrease in light emission in the regulatory mutants may be due to a mutation in synthesis of an autoinducer analogous to that found for the Vibrio fischeri lux system.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170030408
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  • 10
    Electronic Resource
    Electronic Resource
    Bioluminescent assay of ATPase activity in embryonic material using firefly luciferase (1988)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 2 (1988), S. 17-24 
    Details
    ISSN: 0884-3996
    Keywords: ATPase ; firefly luciferase ; amphibian eggs ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The continuous bioluminescent assay of ATP has been adapted to the study of Mg2+-dependent ATPases, including the (Na+,K+) pump, in amphibian tissues.A discrete bioluminescent assay procedure for ATPase has also been developed. Components of the firefly luciferase assay reagent modify the observed ATPase activity but this can be circumvented by performing discrete instead of continuous measurements of enzyme activity. In assays with commercial ATPase preparations the continuous bioluminescent assay procedure gave ATPase activities 2.2-fold lower than obtained with the discrete procedure. In Xenopus oocyte or egg homogenates, in contrast, the total ATPase activity measured is stimulated eight times by the luciferase reagent, mainly through an unexplained activation of a Mg2+-independent ATPase. In other tissues, such as Xenopus brain homogenates, both the continuous and discrete monitoring procedures are equally suitable for the determination of ATPase activity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170020105
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