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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 704-705 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many of the enzymes of the human red cell, both glycolytic and non-glycolytic, apparently decrease in activity as the cell ages in vivo6–10. The activities of two enzymes of glucose metabolism, glucose-6-phosphate dehydrogenase (G-6-PD) (ref. 7) and glyceraldehyde-3-phosphate dehydrogenase ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 389-390 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have used male rhesus monkeys (Macaca mulatto), all of approximately the same age (18-24 months as estimated from body weight). None had had any previous known infection with malaria of any sort. The animals were inoculated with infected whole blood containing about 0*5 x 106 parasites of ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 944-946 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Venous blood was collected and treated with a suitable anticoagulant (heparin, ACD, or EDTA), and haemolysates were prepared as described by Tashian and Shaw6. In experiments in which the hexokinase isozyme patterns of leucocytes were examined, the white cells were separated from freshly drawn ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 345-347 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 summarises the glycolytic intermediate data in the form of glycolytic plots for the monkey-P. knowlesi and the mouse-P. berghei systems. The assay and extraction procedures have been described previously1. Glycolytic plots are subject to variable interpretations and in considering such ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 250 (1974), S. 251-252 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Single stage red cell membranes were prepared by the technique of Hoffman7 with minor modifications. Agents to be incorporated into these membranes were added during haemolysis. The principle of this technique is based on the knowledge that erythrocyte membranes lose their selective permeability at ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Biochemical genetics 1 (1967), S. 25-34 
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The mean content of ATP in red cells of American Negroes is significantly less than the mean level in American Caucasians. This is compatible with the hypothesis that the quantitative level of ATP in red cells may be involved in selective processes related to falciparum malaria. There is no evidence of a sex effect on levels of ATP in either population. Family studies conducted in both populations indicate that the quantitative level of red cell ATP is at least partially inherited. Studies of a number of biochemical characteristics of red cells have been conducted in an effort to elucidate the mechanism of genetic and biochemical control of quantitative levels of erythrocytic ATP. These studies have been negative. Although other studies have demonstrated that thalassemia trait influences the level of red cell ATP, the presence of sickle cell trait or G-6-PD deficiency, the other two systems postulated to be involved in malaria protection, did not result in significant differences in mean red cell ATP content.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Biochemical genetics 3 (1969), S. 475-483 
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Several isozymes of hexokinase have been found in Drosophila robusta. These have been defined in this paper in several dimensions, including genetic variation, ontogenic variation, tissue-organ variation, and substrate specificity.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Biochemical genetics 5 (1971), S. 243-251 
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Correlations in the number (multiplicity) of molecular forms among 10 enzymes have been estimated from a sample of plants representing 22 genera. Significant correlations in multiplicity among some of the 10 enzyme systems suggest a nonrandom organization of variation in number of molecular forms. An analysis of the correlations among enzymes of a glycolytic and Krebs cycle subset supports the occurrence of patterns of influence on multiplicity which correspond to the known metabolic relatedness of the enzymes. We interpret these data as evidence for organization of enzyme multiplicity. This property may be of adaptive value to the species.
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  • 9
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Studies have been conducted on eight sets of monozygous and nine sets of dizygous female Negro twins, both members of whom were heterozygous for G-6-PD deficiency. Twins were studied both by assay of erythrocytic G-6-PD activity and by the methemoglobin elution test (MET). The MET is a procedure which identifies histochemically cells with appreciable G-6-PD activity and permits accurate determination of the percentage of such cells in heterozygotes. Monozygous twins showed significantly less “within-pair” variation than dizygous twins with both the MET and G-6-PD assay. Concerning the significantly greater agreement in MET results in monozygous twins than dizygous twins, our present working hypothesis is that X-chromosomal inactivation in the Negro female is genetically controlled, rather than random. However, certain alternate hypotheses allowing for random X-inactivation have not been excluded; these include somatic cell selection after random X-inactivation, and cell exchange between identical twins in utero/it. Studies in nontwin related heterozygotes now underway should help differentiate among these various possibilities. In addition to the studies on 17 pairs of female twins heterozygous for G-6-PD deficiency, 26 pairs of nondeficient female Negro twins have been studied by G-6-PD assay. Within-pair variation in monozygous twins was significantly less than within-pair variation in dizygous twins in all cases. The genetic influences detected with the G-6-PD assay in the female twins could theoretically be due to nonrandom X-inactivation, to genetically determined quantitative differences in enzyme activity (e.g., isoalleles), or to both. By appropriate calculations, based on the MET results, we have factored out the effects of X-inactivation on overall enzyme activity in the heterozygous deficient twins. After removal of the effect of X-inactivation, monozygous twins heterozygous for enzyme deficiency continue to show significantly less within-pair variation than dizygous twins. This finding indicates significant genetic influences on quantitative G-6-PD activity other than X-inactivation and other than the deficiency allele. This conclusion has been strengthened by studies on male twins where X-inactivation is not present.
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  • 10
    ISSN: 1573-4927
    Keywords: genome mapping ; evolution ; homology ; polymerase chain reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We are developing a genetic map of the dog based partly upon markers contained within known genes. In order to facilitate the development of these markers, we have used polymerase chain reaction (PCR) primers designed to conserved regions of genes that have been sequenced in at least two species. We have refined the method for designing primers to maximize the number that produce successful amplifications across as many mammalian species as possible. We report the development of primer sets for 11 loci in detail:CFTR, COL10A1, CSFIR, CYP1A1, DCN1, FES, GHR, GLB1, PKLR, PVALB, andRB1. We also report an additional 75 primer sets in the appendices. The PCR products were sequenced to show that the primers amplify the expected canine genes. These primer sets thus define a class of gene-specific sequence-tagged sites (STSs). There are a number of uses for these STSs, including the rapid development of various linkage tools and the rapid testing of genomic and cDNA libraries for the presence of their corresponding genes. Six of the eleven gene targets reported in detail have been proposed to serve as “anchored reference loci” for the development of mammalian genetic maps [O'Brien, S. J.,et al., Nat. Genet. 3:103, 1993]. The primer sets should cover a significant portion of the canine genome for the development of a linkage map. In order to determine how useful these primer sets would be for the other genome projects, we tested the 11 primer sets on the DNA from species representing five mammalian orders. Eighty-four percent of the gene-species combinations amplified successfully. We have named these primer sets “universal mammalian sequence-tagged sites” because they should be useful for many mammalian genome projects.
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