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  • Biochemistry and Biotechnology  (3)
  • Escherichia coli  (2)
  • Histamine  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization and Preliminary X-ray Analysis of γ-Glutamyltranspeptidase from Escherichia coli K-12
    Amsterdam : Elsevier
    Journal of Molecular Biology 234 (1993), S. 1259-1262 
    Details
    ISSN: 0022-2836
    Keywords: Escherichia coli ; X-ray crystallography ; crystallization ; glutathione ; γ-glutamyltranspeptidase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jmbi.1993.1677
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization and Preliminary X-ray Analysis of Copper Amine Oxidase from Escherichia coli K-12
    Amsterdam : Elsevier
    Journal of Molecular Biology 238 (1994), S. 635-637 
    Details
    ISSN: 0022-2836
    Keywords: Escherichia coli ; X-ray crystallography ; copper-amine oxidase ; crystallization ; monoamine oxidase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jmbi.1994.1321
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of histamine on the smooth muscle cells of the ear artery of the rabbit (1980)
    Springer
    Pflügers Archiv 387 (1980), S. 17-25 
    Details
    ISSN: 1432-2013
    Keywords: Vascular smooth muscle ; Histamine ; Excitation-contraction-coupling ; Perivascular nerves ; Cellular Ca store
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Histamine activates both H1- and H2-receptors in the ear artery of the rabbit. The specific action of these receptor activations on the membrane potential and the force development has been investigated by using the H1-blocking agent mepyramine and the H2-blocking agent cimetidine. H1-activation depolarizes and increases force development, while H2-activation hyperpolarizes and reduces force development. These effects on the force development can occur independently of the changes of the membrane potential. By determining the effect of histamine on tissues which were denervated with 6-hydroxydopamine it was shown that histamine exerts its effect directly on the smooth muscle cells. Na-deficiency depolarizes the smooth muscle cells, but it also reduces the changes of the membrane potential and the force development induced by H1-stimulation. K-free medium prevents the hyperpolarizing effect of H2-activation. As far as the ion fluxes are concerned and H1-activation is found to induce an increased efflux of K while a simultaneous H2-activation only reduces the increase of flux induced by H1-activation. H1-activation induces a release of Ca from the intracellular Ca stores, while H2-activation inhibits this release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580839
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  • 4
    Electronic Resource
    Electronic Resource
    Direct and indirect effects of histamine on the smooth muscle cells of the guinea-pig main pulmonary artery (1983)
    Springer
    Pflügers Archiv 399 (1983), S. 46-53 
    Details
    ISSN: 1432-2013
    Keywords: Histamine ; Main pulmonary artery ; Neuromuscular transmission ; Noradrenaline sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electrophysiological studies of the effects of histamine on the smooth muscles in the guinea-pig main pulmonary artery revealed that this amine produced muscle contraction with an associated depolarization of the membrane. Application of cimetidine potentiated and that of mepyramine suppressed these histamine-induced responses. In the presence of mepyramine, histamine produced membrane hyperpolarization. Contractions produced by perivascular nerve stimulation were potentiated by histamine, and additional application of cimetidine further potentiated while addition of mepyramine suppressed the histamine-induced enhancement. The amplitude of excitatory junction potentials was increased by application of histamine plus cimetidine and was decreased by histamine plus mepyramine. Excitatory effects of histamine on the electrical and mechanical responses were reduced by application of tetrodotoxin, prazosin, phentolamine or guanethidine. In the presence of these drugs, histamine produced depolarization with an associated increase in membrane resistance and, in high concentrations, produced spike potentials. Electrical and mechanical responses of the smooth muscles to exogenously applied noradrenaline were potentiated by pretreatment with histamine and cimetidine, and were suppressed by histamine and mepyramine. These observations indicate that the guinesa-pig main pulmonary artery possesses two types of histamine receptor, H1- and H2-receptors, in the smooth muscles and in the perivascular adrenergic nerves. Stimulation of H1 or H2-receptor produces excitatory or inhibitory effects, respectively, on the smooth muscles and on the adrenergic nerves. Contraction of the muscle tissues produced by histamine is brought about by a direct effect on the smooth muscles and by increased release of transmitters, as a result of excitation of perivascular nerves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652521
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of immobilized enzymes from acrylic monomers under γ-ray irradiation (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 119-128 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Immobilized glucoamylase, invertase, and β-galactosidase were prepared by using 2-hydroxyethyl acrylate and dimethylacrylamide under γ-ray irradiation. In the case of 2-hydroxyethyl acrylate, the monomer-enzyme solution was changed to the gel by irradiation of less than 1.0 Mrad, but it was difficult to eliminate enzyme leakage from the gel. When leakage was eliminated by increased irradiation, the activities of the gels were very low. In the case of dimethylacrylamide, the monomer-enzyme solution was changed to a gel by irradiation of 1.0 Mrad; leakage could be eliminated by irradiation of 2.0 Mrad. This gel possessed very high activity. In the case of acrylic acid-sodium acrylate, the monomer-enzyme solution could not be changed to a gel. In preparing gels, high concentrations of enzyme protein had a tendency to obstruct gelation.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170110
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Application of polylysine bound succinyl-NA to a membrane reactor (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 1761-1775 
    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 amide bond at N-6 in succinyl-NAD was found to be more stable than in former accounts. Succinyl-NAD was coupled on polylysine to give a new polymer derivative of NAD, which retained at least 85% of the initial coenzymic activity even after dialysis for one week. The polymer derivative of NAD could be applied to a membrane reactor containing alcohol dehydrogenase and lactate dehydrogenase and lactate was continuously produced in a half-life of ten days.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260181210
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of immobilized enzymes by N-Vinylpyrrolidone and the general properties of the glucoamylase gel (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 16 (1974), S. 1517-1528 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Immobilized glucoamylase, invertase, and β-galactosidase were prepared by using N-vinylpyrrolidone monomer (VP) under γ-ray irradiation. The enzyme-VP solutions were gelled by irradiation with 2.9 Mrad and the added enzymes were almost completely entrapped. Activity losses on entrapping were 55% for the VP-glucoamylase gel, and more than 90% in the case of VP-invertase and VP-β-galactosidase gels. No leakage of enzyme from these gels could be detected within 1 hr. The VP-glucoamylase gel was capable of hydrolyzing dextrin (mol wt 10,400) to glucose and the glucose equivalent was equal to that obtain able with native enzyme. The optimum temperature, heat stability, pH activity curve, and pH stability of VP-glucoamylase gel were slightly inferior to those of native enzyme, while Km was a little larger than that of native enzyme.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260161108
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    Paper (German National Licenses)
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