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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 6 (1967), S. 2735-2739 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 132-134 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Differential labelling experiments establish that synthesis of a non-histone protein of molecular weight 41,000 is specifically enhanced in response to the injection of cortisol into ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 41 (1980), S. 119-130 
    ISSN: 1432-0584
    Keywords: Nucleus ; Nuclear protein ; Histone ; Granulocyte ; Leukocyte ; Nuklearproteine ; Histone ; Granulozyten ; Leukozyten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Alterations in nuclear proteins during maturation may be responsible for gene activation and repression. Study of these proteins requires: (1) a system for separating cells into varying degrees of maturity, and (2) a procedure for separating the nuclear proteins. The former was accomplished using Ficoll/Hypaque density gradients to separate rabbit granulocyte precursors. Erythrocytes and their precursors were removed by hypotonic lysis. Histones were extracted from purified nuclei with sulfuric acid, and analyzed on polyacrylamide gels containing urea. Residual non-histone proteins were separated by electrophoresis on sodium dodecyl sulfate-polyacrylamide gels. Quantitation of nuclear proteins during development shows no change in the histones, but a significant increase in the non-histone proteins. Therefore, the ratio of non-histone to histones increases progressively during maturation. Histone electrophoresis revealed no significant qualitative or quantitative changes in their five major classes during development. By contrast, electrophoretic analysis of the non-histone proteins revealed distinct changes which include a striking decrease in low molecular weight protein during maturation, and also certain changes in other peptide bands. These changes may reflect alterations in nuclear structure, a changing complement of the nuclear proteins involved in genetic regulation, or a combination of both.
    Notes: Zusammenfassung Veränderungen der Kernproteine während der Zellreifung können für die Gen-Aktivierung und -Repression verantwortlich sein. Eine Untersuchung dieser Proteine erfordert: 1. Ein System zur Separierung von Zellen verschiedener Reifestufen; 2. eine Methode zur Separierung der Kernproteine. Das erstere wurde durch Separation von granulozytären Vorläuferzellen des Kaninchens im Ficoll-Hypaque-Dichtegradienten erreicht; hierbei wurden Erythrozyten und ihre Vorläufer durch hypotone Lyse entfernt. Sodann wurden Histone aus gereinigten Kernextrakten durch Schwefelsäure extrahiert und auf harnstoffhaltigem Polyacrylamid-Gel analysiert. Die restlichen Proteine wurden elektrophoretisch auf Polyacrylamid-Gel getrennt. Während der Zellentwicklung zeigen die Kernproteine keine quantitativen Änderungen der Histone, jedoch eine signifikante Zunahme der Nicht-Histon-Proteine. Das Verhältnis von Nicht-Histonen zu Histonen nimmt deshalb während der Zellreifung ständig zu. Die Histon-Elektrophorese deckte keine signifikanten oder quantitativen Veränderungen in den fünf Hauptgruppen während der Reifung auf. Im Gegensatz hierzu zeigte die elektrophoretische Analyse der Nicht-Histon-Proteine deutliche Veränderungen, wie z.B. eine wesentliche Abnahme der niedrigmolekularen Proteine während der Reifung und bestimmte Veränderungen in anderen Peptidbanden. Diese Befunde können Veränderungen in der Kernstruktur oder einen wechselnden Anteil an Kernproteinen der genetischen Regulation bzw. beides widerspiegeln.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 10 (1979), S. 405-418 
    ISSN: 0091-7419
    Keywords: nuclear envelope polypeptides ; chemical and enzymatic digestion ; Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The three most abundant nonhistone polypeptides (molecular weights 75,000, 71,000 and 61,000) of the avian erythrocyte nucleus have previously been isolated in the nuclear envelope fraction. They have been separated by sodium dodecylsulfate-polyacrylamide gel electrophoresis and peptide-mapped after limited enzymatic digestion. Three enzymes-chymotrypsin, papain and Staphylococcus aureus protease-were used. Results obtained with each enzyme indicate strong similarities between the three nuclear envelope polypeptides. The amino acid compositions of the two most abundant polypeptides (P75 and P71) have been determined and found to be similar. Further, they readily yield large fragments upon brief alkaline hydrolysis. For both P75 and P71 the degree and the pattern of alkaline fragmentation are almost identical. A 61,000-dalton polypeptide which appears to be P61 is obtained from P75 and P71 by mild acid hydrolysis. These results establish the close chemical similarity of these predominant polypeptides in the erythrocyte nucleus and suggest that they serve related functions.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 18 (1997), S. 499-505 
    ISSN: 0197-8462
    Keywords: RF radiation ; microwave radiation ; stress proteins ; heat shock proteins ; mammalian cells ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The induction of stress proteins in HeLa and CHO cells was investigated following a 2 h exposure to radiofrequency (RF) or microwave radiation. Cells were exposed or sham exposed in vitro under isothermal (37 ± 0.2 °C) conditions. HeLa cells were exposed to 27- or 2450 MHz continuous wave (CW) radiation at a specific absorption rate (SAR) of 25 W/kg. CHO cells were exposed to CW 27 MHz radiation at a SAR of 100 W/kg. Parallel positive control studies included 2 h exposure of HeLa or CHO cells to 40 °C or to 45 μM cadmium sulfate. Stress protein induction was assayed 24 h after treatment by electrophoresis of whole-cell extracted protein labeled with [35S]-methionine. Both cell types exhibited well-characterized responses to the positive control stresses. Under these exposure conditions, neither microwave nor RF radiation had a detectable effect on stress protein induction as determined by either comparison of RF-exposed cells with sham-exposed cells or comparison with heat-stressed or Cd++ positive control cells. Bioelectromagnetics 18:499-505, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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