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  • 1
    ISSN: 1432-1440
    Keywords: Deoxyribonucleases ; diagnosis ; DNA-damage ; microdiscelectrophoresis ; repairmechanism ; urine ; Xeroderma pigmentosum ; Desoxyribonucleasen ; Diagnose ; DNA-Schaden ; Microdiscelektrophorese ; Repairmechanismus ; Urin ; Xeroderma pigmentosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Verteilungsmuster der DNase-Aktivität1 im Urin von Normalpersonen und X.p.-Patienten wurde mit einem mikro-disk-elektrophoretischen Verfahren untersucht. Bei saurer Inkubation sind 4 distinkte Aktivitätsbanden im Normalurin nachweisbar. Urin von X.p.-Patienten zeigt eine deutliche Verminderung der 2.–4. Bande, wobei die Veränderung der 3. Bande besonders auffällig ist. Es wurde ferner untersucht, wie sich das Verhalten verändert, wenn statt nativer DNA denaturierte als Substrat angeboten und wenn die zweiwertigen Ionen durch EDTA komplexiert wurden. Eine Aktivitätsverminderung ist nicht auf das Auftreten von Inhibitoren zurückzuführen, sondern wahrscheinlich durch eine Konzentrationsverminderung an Enzym verursacht.
    Notes: Summary The distribution pattern of desoxyribonuclease (DNase) activity1 in the urine of healthy subjects and xeroderma pigmentosum (X.p.) patients has been examined by micro disc electrophoresis. When incubated at pH 5.0, four distinct bands of DNase activity are shown in normal urine. In urine of X.p. patients a significant decrease of the second to fourth band can be observed. The change of the third band is extremely obvious. Further to the influence of native DNA, denaturated DNA and EDTA on the pattern of DNase activities were studied. The decrease of DNase activity in X. p. urine is not due to the presence of an inhibitor but is rather caused by lower enzyme concentrations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 275 (1983), S. 213-217 
    ISSN: 1432-069X
    Keywords: Acid ; Neutral DNases ; Epidermis ; Microdisc ; Electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Acid and neutral deoxyribonucleases (DNases) of the cow snout epidermis were investigated by the microdiscelectrophoresis of polyacrylamide gels containing highly polymerized DNA and by isoelectric focusing techniques. The nucleases were characterized with respect to their pH optimum. An acid DNase at pH 5.0 was detected as a single distinct band after the electrophoretic separation. After isoelectric focussing also, only one acid DNase activity with an isoelectric point (IP) of 6.2 was detectable. Neutral DNases at pH 7.4 were demonstrated as major and minor bands by their different electrophoretic mobilities. In the isoelectric focusing system also, two neutral DNases, a major one (IP, 4.6) and a minor one (IP, 6.4), were found. Characterization with respect to their histologic location showed acid and neutral DNases across the epidermal layers with the highest activities in the upper layers, where DNA concentration had been shown to be lowest. In correlation with their subcellular distribution, the highest activities of both acid and neutral DNase were found in the 105,00xg supernatant of the subcellular fractions.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 41 (1978), S. 273-286 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Different degrees of severity in global brain oedema were induced by varying amounts of water intoxication (50, 100, 150, and 200 ml Aqua dest./kg b.wt. intravenously) in groups of six cats, which were functionally nephrectomized. Animals loaded with physiological saline and sham-operated served as controls. Two hours following the water load, the tissue concentrations of CrP, ATP, ADP, AMP, pyruvate, glucose, and lactate were determined by optical enzymatic analysis. The results show disturbances in brain energy metabolism dependent on the severity of the brain oedema. The high energy compounds and in consequence the ATP/ADP-ratio, and respectively the energy charge potential, fall in direct relationship to the severity of the brain oedema. Lactate and lactate-pyruvate ratio increase. The energy source of the cell, glucose as well as pyruvate, significantly falls in the group with severe brain oedema. The results of the brain energy metabolism were compared with our previous study concerning the brain water content, rCBF and CPP in global brain oedema (Meiniget al. 1973). The results show that the disturbances of energy metabolism are directly related to the rCBF and are not dependent on CPP over a wide range.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 548-550 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The purification procedure for a nuclease from human serum is described. It includes ammonium sulfate precipitation, chromatography on DEAE-Sephadex and on Sephacryl-S 200, and preparative electrophoresis. The enzyme, purified about 2000-fold, is homogeneous in a sodium dodecyl sulfate electrophoretic system, where it has a mol. wt of 78,000. The pH optimum lies around pH 6.5; it is a sugar-nonspecific endonuclease.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-069X
    Keywords: Psoriasis ; DNA-bindung proteins ; DNase ; DNA-polymerase ; RNA-polymerase ; Psoriasis ; DNA-Affine Proteine ; DNase ; DNA-Polymerase ; RNA-Polymerase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung DNA-affine Proteine (DBP) aus normaler menschlicher Haut, Epidermis, Hornschicht und Psoriasisschuppen sind eine gewebsspezifische Proteingruppe, die zumeist aus nukleären Nichthiston-Proteinen besteht. Um ihre Funktion zu analysieren, wurden sie auf enzymatische Aktivitäten von DNase, DNA-Polymerase und RNA-Polymerase untersucht. DBP der Epidermis und der Hornschicht enthalten vergleichbare Aktivitäten von vier verschiedenen DNasen. Eine davon ist nur bei pH 5.0 aktiv. Die anderen DNasen scheinen während der Keratinisierung ihr pH-Optimum zu verändern: DNasen der Epidermis-DBP sind aktiv im pH-Bereich von 5.0–8.5, während die entsprechenden DNasen der Hornschicht-DBP bei pH 7.4 ihre größte Aktivität zeigen. In Psoriasisschuppen sind diese DNasen inaktiv, während die pH 5.0-DNasen offenbar eine verringerte DNA-Affinität besitzen. DBP der menschlichen Haut enthalten Aktivitäten von vier anderen DNasen, die nicht mit den DNasen epidermaler DBP vergleichbar sind. DNA-Polymerase-Aktivität ist in jeder DBP-Fraktion enthalten und beruht auf verschiedenen DNA-Polymerasen. Zwei DNA-Polymerasen mit pI-Werten von 4.5 und 9.3 dürften der eukaryotischen β-bzw. α-DNA-Polymerase entsprechen. Weiterhin wurden DNA synthetisierende Proteine mit pI-Werten von 6,5–7,2 und 8,2 gefunden, die entweder gewebsspezifische DNA-Polymerasen oder andere Thymidinmonophosphat einbauende Enzyme darstellen. RNA-Polymerasen konnten aus den entsprechenden Rohextrakten nicht durch DNA-Affinitätschromatographie angereichert werden.
    Notes: Summary DNA-bindung proteins (DBP) of normal human dermis, epidermis, horny layer and psoriatic scales represent a tissue-specific group of mostly nuclear nonhistone proteins. To analyse their function, the different DBP fractions were examined concerning the presence of DNase, DNA-polymerase and RNA-polymerase activities. DBP of normal epidermis and horny layer contain four different DNases. One DNase of both DBP fractions is active only at pH 5.0. Three DNases of epidermal DBP are active at a pH-range from 5.0–8.5, while the corresponding DNases of horny layer-DBP are most active at pH 7.4. Probably these DNases have changed their pH-optimum during keratinisation. DBP of psoriatic scales include no activity of these three DNases and the pH 5.0-DNases seem to have reduced DNA-affinity. Human dermis DBP contain quite another set of four DNases which hardly can be correlated to the DNases of epidermal DBP. DNA-polymerase activities are present in each fraction and derive from different DNA-polymerases. Two DNA-polymerases with pI-values of 4.5 and 9.3 may correspond to β- and α-DNA-polymerase of eukaryotes, respectively. Further activity of proteins which are focussed at pH 6.5–7.2 and 8.2 could be detected. The proteins represent either tissue-specific DNA-polymerases or further thymidine monophosphate incorporating enzymes. Contrary, RNA-polymerase activity could not be enriched from correlating extracts by DNA-cellulose chromatography.
    Type of Medium: Electronic Resource
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