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  • 1990-1994
  • 1985-1989  (4)
  • 1985  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Penning ionization ternary gas mixtures for diffuse discharge switching applications (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 633-641 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The increase in the total ionization produced by high-energy α particles in Ar/C2F6 mixtures, which have conduction and insulation properties appropriate for use in diffuse discharge switching applications by addition of low ionization energy additives has been quantitatively studied. The energy to produce an electron-positive ion pair (ip) W in C2F6 was found to be 34.7 eV/ip; this rather high value is attributed to the large cross section for electron impact-induced dissociation of C2F6. The W values of Ar/C2F6 mixtures have also been measured and are reported; they increase with increasing C2F6 content. The W values of Ar/C2F6 binary gas mixtures have been found to decrease by addition of C2H2 or 2-C4H8. Quantitative measurements of the W values of the ternary gas mixtures are reported. The amounts of C2H2 or 2-C4H8 in Ar/C2F6, which maximize the increase in total ionization have been estimated; some of these ternary gas mixtures may be useful for diffuse discharge switches sustained by external electron beams. The experimental results on the W values for the binary and ternary gas mixtures studied have been modeled and good agreement has been found between the experimental and the calculated results. From an analysis of the data it has been found that the α-particle energy is partitioned between C2F6 and Ar approximately in the ratio 4.2:1. It has also been found that at the argon pressures employed, the probability of deexcitation of excited argon atoms by C2F6 (or C2H2 or 2-C4H8) molecules is more than three orders of magnitude larger than the probability of radiative deexcitation of the excited argon atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336201
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of Oligosaccharides During Hydrolysis of Lactose in Milk Using β-Galactosidase from Bacillus circulans (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    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 characteristics of β-galactosidase from Bacillus circulans, and its suitability for hydrolysis of milk lactose were compared with those of Escherichia coli and Kluyveromyces lactis enzymes. Enzyme activity of β-galactosidase from B. circulans was not affected by major cations and proteins present in skim milk, whereas milk proteins and sodium and calcium ions decreased the activity of the enzymes from E. coli and K. lactis. The enzyme from B. circulans produced less oligosaccharides than E. coli and K. lactis during hydrolysis of lactose in skim milk at different lactose concentrations. Oligosaccharides produced by the enzyme from B. circulans disappeared almost completely at the latter stage of hydrolysis, while a large amount of oligosaccharides were still detected even at 98% conversion of lactose with enzymes from E. coli and K. lactis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb10543.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Continuous Synthesis of N-(Benzyloxycarbonyl)- L -Aspartyl- L -Phenylalanine Methyl Ester with Immobilized Thermolysin in an Organic Solvent (1985)
    [s.l.] : Nature Publishing Company
    Nature biotechnology 3 (1985), S. 459-464 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] N - (benzyloxycarbonyl) - L - aspartyl - L - phenylalanine methyl ester, the precursor of the synthetic sweetener aspartame, was continuously synthesized in an organic solvent with immobilized thermolysin. Ethyl acetate was found to be the most effective organic solvent for the synthesis of this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt0585-459
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  • 4
    Electronic Resource
    Electronic Resource
    Antimutagenic unusual amino acids from plants (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1622-1623 
    Details
    ISSN: 1420-9071
    Keywords: Antimutagens ; natural product ; unusual amino acids ; isolation and structural determination ; Liliaceae ; Sapindaceae ; Salmonella typhimurium TA100
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Five unusual amino acids were identified as antimutagens against spontaneous mutation ofSalmonella typhimurium TA100: L-azetidine-2-carboxylic acid (1) from Liliaceae plants, α-(methylenecyclopropyl)glycine (2) fromLitchi chinensis seeds, and 2-amino-4-methylhex-5-ynoic acid (3), hypoglycin A (4), and (2S, 4R)-2-amino-4-hydroxyhept-6-ynoic acid (5) fromEuphoria longana seeds. The absolute stereochemistry of5 was determined by its chiral synthesis from L-allylglycine, proving that5 is the C-4 epimer of the amino acid previously isolated from dried longan seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964840
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    Paper (German National Licenses)
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