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  • Nature Publishing Group  (3)
  • Blackwell Publishing Ltd  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 851-851 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These data might suggest that glycerol crosses the membrane of some erythrocytes by facilitated diffusion and crosses others by simple diffusion but that thiourea always crosses by simple diffusion. That this might not always be the case is suggested by the results of Jacobs et al.6. They reported ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 816-817 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There are several reports in the literature of volume changes of erythrocytes which result from the exchange of a monovalent for a divalent anion3-8. In the physiological exchange of chloride ion for bicarbonate ion across the erythrocyte membrane slight volume changes are expected as a result of a ...
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 13 (1966), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Nicotinamide adenine dinucleotide phosphate (NADP) and nicotinamide adenine dinucleotide (NAD) linked isocitrate dehydrogenase and NADP linked alcohol dehydrogenase have been detected in Euglena gracilis var. bacillaris.The NADP isocitrate dehydrogenase showed half-maximal activity at a concentration of 3 × 10−5 M DL-isocitrate, but did not follow simple Michaelis-Menten kinetics with respect to substrate concentration. The optimal NADP concentration was about 0.06 mM, and activity fell off sharply on either side of this optimum. Fresh preparations of the enzyme migrated as single bands in disc electrophoresis, but two enzymatically active bands were present after frozen storage.The NAD isocitrate dehydrogenase followed Michaelis-Menten kinetics with respect to substrate. In crude extracts, no requirement for adenosine monophosphate, adenosine diphosphate, or sulfhydryl compounds could be found.NADP alcohol dehydrogenase activity could be found with either ethanol or propanol as substrate. Low concentrations of coenzyme A were moderately inhibitory.In tris(hydroxymethyl) aminomethane buffer (tris buffer), Euglena extracts reduced NAD slowly in the absence of exogenous substrate. In the absence of tris, no such reduction occurred. A similar phenomenon was observed with NADP.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 9 (1962), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Most tricarboxylic acid cycle intermediates are oxidized by intact cells of the apochlorotic flagellate Astasia longa (Jahn). Use of these substrates depends on the pH of the medium. The acetate-stimulated respiration is much more sensitive to metabolic inhibitors than is cell motility. The following glyoxylate cycle and/or tricarboxylic acid cycle enzymes have been demonstrated in cell-free extracts: acetic-thiokinase, condensing-enzyme, aconitase, TPN-isocitric dehydrogenase, succinic dehydrogenase, fumarase, and malic dehydrogenase.
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 203 (1964), S. 788-789 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Human blood was obtained by venipuncture and citrated. It was refrigerated no more than 24 h before being washed three times in solution A (phosphate buffered, pH 7.1, isotonic sodium chloride). For examination of initial volumes, 1 ml. of packed cells obtained following the third washing was added ...
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