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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal pattern of glycosylation in frog liver (1991)
    Springer
    Bioscience reports 11 (1991), S. 23-31 
    Details
    ISSN: 1573-4935
    Keywords: frog ; glycoproteins ; glycosyl transferases ; liver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The circannual behaviour of glycosylation and protein synthesis in frog liver slices was studied following the incorporation of3H-galactose and14C-glucosamine into glycolipids and glycoproteins and3H-leucine into proteins. The activity of two enzymes the galactosyl-transferase and the N-acetyl-glucosaminyl-1-P-transferase was determined. The incorporations of both sugars into the soluble fraction and into the lipid extract present a maximum during the spring-summer period. The incorporation into the protein fraction displays a different pattern:14C-Glucosamine and3H-leucine incorporation increases from winter to a maximum in autumn; the incorporation of3H-Galactose has a sharp peak during spring. The pattern of glycosyltransferase activities is similar to the pattern of incorporation of the two saccharides into proteins, indicating these enzymes as important control points for glycosylation in Anurae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01118602
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A portable positron accumulator for antihydrogen formation (1993)
    Springer
    Hyperfine interactions 76 (1993), S. 127-133 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A pulsed source of positrons has been developed which may be useful for antihydrogen ( $$\bar H$$ ) formation because it is portable when compared to accelerator-based sources. This positron accumulator uses a Penning-style trap to collect moderated positrons from a radioactive source. The positron pulses may be emitted with repetition rates in the range of 50–1000 Hz, which is appropriate for $$\bar H$$ production schemes involving laser-induced recombination. Bunching techniques may be used to vary the width of the positron pulses over the range 30–120 ns (FWHM) to match the width of the antiproton and/or laser pulses. The efficiency of the accumulator increases from ∼ 10% at 100 Hz to ∼ 50% at 1000 Hz. 250 Hz the efficiency is ∼ 25% and the accumulator has delivered up to 8 e+/pulse per mCi of positron activity. This translates into ∼ 1.2 × 105 e+/pulse for a 100 Ci58Co source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316711
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Studies on the possible biological effects of 50 Hz electric and/or magnetic fields: Evaluation of some glycolytic enzymes, glycolytic flux, energy and oxido-reductive potentials in human erythrocytes exposed in vitro to power frequency fields (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 14 (1993), S. 383-391 
    Details
    ISSN: 0197-8462
    Keywords: erythrocytes ; metabolism ; electric and/or magnetic fields ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: An attempt has been made to understand whether 50 Hz electric and magnetic fields (EMFs) are involved in producing bioeffects by exposing human erythrocytes in vitro. The study evaluated some key glycolytic enzymes, glucose consumption, lactate production, energy charge, 2,3-diphosphoglycerate, and reduced glutathione levels. all of which are biochemical parameters significant to erythrocyte function. Cells exposed to individual or superimposed EMFs have not shown any significant difference compared with the controls. © 1993 Wiley-Liss. Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250140410
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    Paper (German National Licenses)
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