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  • 1
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Documenta ophthalmologica 20 (1966), S. 675-683 
    ISSN: 1573-2622
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La filtration du sérum sur colonne de gel semble convenable pour la séparation des substances aromatiques de dimension moléculaire faible. Registration continuelle de la fluorescence visible du filtrat présente un maximum qui indique une élution retardée par rapport aux autres petites molécules. Ce maximum est très élevé pour le sérum de rats diabétiques atteints de cataracte après traitement par l'alloxane. La même tendance est démontrée chez des souris américaines hyperglycémiques obèses et non sélectionnées. Dans des lapins normaux et diabétiques (sans et avec cataracte) la fluorescence des fractions à faible poids moléculaire est sans exception forte. Les fractions correspondentes chez les diabétiques humains montrent une fluorescence très faible dans la partie visible du spectrum. Concernant la dégradation des acides aminés aromatiques la fluorescence dans l'ultraviolet paraît être plus importante, mais de telles mesures n'ont pas été effectuées. Les relations possible entre la fluorescence du sérum et celle du cristallin dans le diabète sont brièvement discutées.
    Abstract: Zusammenfassung Gelfiltration erscheint zweckmäßig zur Trennung niedermolekularer, aromatischer Verbindungen von Serumproteinen. Fortlaufende Registrierung der sichtbaren Fluoreszenz des Eluates zeigt einen Gipfel, der in Bezug auf andere kleine Moleküle eine verzögerte Elution angibt. Eine auffallende Erhöhung dieses Gipfels ist in alloxandiabetischen Ratten mit Cataracten gefunden worden. Dieselbe Tendenz erscheint auch in einem nicht ausgewählten Material amerikanischer Fettmäuse mit Hyperglycaemie. In normalen und diabetischen Kaninchen mit oder ohne Cataracten ist die Fluoreszenz der niedermolekularen Fraktion durchaus stark. Die entsprechenden Fraktionen humanen Diabetesserums zeigen eine sehr schwache Fluoreszenz im sichtbaren Gebiet des Spektrums. Die Fluoreszenz im ultravioletten Gebiet dürfte wichtiger sein, wenn es sich um den Abbau der aromatischen Aminosäuren handelt, aber ist nicht in diesem Zusammenhang gemessen worden. Mögliche Beziehungen zwischen der Fluoreszenz des Serums und der Augenlinse bei Diabetes werden kurz diskutiert.
    Notes: Summary Gel filtration seems to be convenient for separating aromatic compounds of low molecular size from serum proteins. By continuous recording of the visible fluorescence of the flow, a peak is obtained which indicates a retarded elution as compared with other small molecules. This peak is markedly elevated in alloxan diabetic rats with cataracts. The same tendency is shown in an unselected material of American obese hyperglycaemic mice. In normal and diabetic rabbits with or without cataracts the fluorescence of the low molecular fractions is invariably strong. The corresponding fractions from human diabetics show a very low fluorescence in the visible part of the spectrum. The fluorescence in the ultraviolet region seems to be more important as far as the degradation of aromatic amino acids is concerned but has not been estimated in this context. Possible connections in diabetes between the fluorescence of the serum and the eye lens are briefly discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 17 (1977), S. 61-73 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Purification of a commercial preparation ofAchromobacter fischeri was carried out by agarose-suspension electrophoresis and by molecular-sieve chromatography. Both the luciferase and an oxidoreductase, catalyzing reduction of FMN with NADH, were obtained in more than one form. Flavins, liable to interfere with the light production in analytical applications, were present in amounts worthy of consideration, but seem to be firmly bound to protein. The major quantity was found in the enzymatically inactive fractions. In free zone electrophoresis of the main luciferase component, the mobility of the zone containing enzyme activity was calculated to −4.0 × 10−5 cm2 sec−1 V−1 at12 °C. Fractions of the two enzymes were separated and mixed in different proportions to study how the intensity and time course of NADH-induced light emission can be modified. These experiments disclosed how reaction mixtures will have to be composed in appropriate photokinetic assays, using NADH as measurable product. A regenerating system based on the purified fractions is described. Instead of the light flash, following the consumption of NADH, the light is emitted on a well maintained level, permitting assays with a less elaborate equipment than the one required for the recording of fast reactions.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 32 (1980), S. 5-12 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Bioluminescence photokinetic assay of NADP+ is described, using the glucose-6-phosphate dehydrogenase reaction for conversion to its reduced form and subsequent measurement of this with luciferase extracts of Vibria fisherii. The analyses were applied to the determination of the activity of minute amounts of glutathione reductase using NADP+ as measurable product and for nucleotide assay in cell samples of 0.5–10 μ g dry weight. The sensitivity was sufficient for determining 0.5 picomoles NADP+. Previously, FMN, NADH, NAD+ and NADH have been analysed with the bacterial luciferase system. Its applicability has now been extended by the assay of NADP+.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 4 (1989), S. 446-453 
    ISSN: 0884-3996
    Keywords: Bioluminescence analysis ; coupled reactions ; enzymatic cycling ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Luminescence analysis may be applied to many substances by arranging a prior reaction producing a species entering the light-emitting reaction. Under favourable conditions the two consecutive reactions are carried out simultaneously as a one-step procedure. In a bioluminescence assay, luciferase stability is frequently a problem, making it desirable to develop analytical schemes where the analytical response becomes largely independent of any impaired luciferase activity. The value of maximal emission or an approached steady-state level is a convenient and usually well-defined analytical parameter. When recording this level it is important to design the participating reactions in a way that compensates for changes in luciferase activity.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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