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  • 1
    ISSN: 1432-0428
    Keywords: Glucose load ; insulin ; growth hormone ; acromegaly ; pituitary irradiation ; hyperinsulinism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le taux d'insuline et d'hormone de croissance à la suite d'une charge en glucose (100 g) par voie orale fut mesuré chez23 acromégaliques qui avaient été traités par radiothérapie. Seize de ces patients étaient considérés cliniquement en phase «inactive» et les sept autres en phase «active». Deux de ces derniers étaient diabétiques et sous traitement. Treize sujets normaux, non obèses, formaient le groupe témoin. Cinq acromégaliques en phase «inactive» ont présenté à la suite d'une charge en glucose des valeurs de la glycémie dépassant les limites supérieures de la normale. Tous les acromégaliques en phase «active» et «inactive» présentaient une hyperinsulinémie à l'état de jeûne et à la suite d'une charge en glucose. Cette observation d'une montée exagérée de l'insulinémie à la suite d'une charge en glucose chez des acromégaliques cliniquement «inactifs» suggère qu'un taux sérique d'hormone de croissance continuellement élevé peut avoir amené des changements permanents de la réponse des îlots du pancréas à la suite d'une stimulation venant du glucose. Les valeurs moyennes du taux sérique de l'hormone de croissance étaient semblables à l'état de jeûne chez le groupe des témoins et chez les acromégaliques en phase «inactive». Ces derniers n'ont pas présenté une baisse du taux sérique d'hormone de croissance à la suite d'une charge en glucose.
    Abstract: Zusammenfassung Die vorliegende Arbeit beschreibt den Verlauf der Seruminsulin- und Wachstumshormonwerte nach oraler Verabreichung von 100 g Glucose bei 23 Patienten mit Akromegalie, die früher mit Bestrahlung behandelt worden waren. Auf Grund der klinischen Befunde zum Zeitpunkt der Untersuchungen wurden sechzehn Patienten als „inaktive“ und sieben Fälle als „aktive“ Akromegale eingestuft. Zwei von den „aktiven“ Akromegalen waren behandelte Diabetiker. Dreizehn gesunde, nicht fettsüchtige Personen bildeten die Kontroll-gruppe. Fünf „inaktive“ Akromegale hatten nach der Glucosebelastung Blutglucosewerte über dem Normbereich. Sowohl die „inaktiven“ als auch die „aktiven“ Akromegalen zeigten Hyperinsulinämie nüchtern und nach Glucosezufuhr. Die gesteigerte Insulinsekretion der klinisch „inaktiven“ Akromegalen nach Glucosebelastung kann bedeuten, daß chronisch erhöhte Spiegel des zirkulierenden Wachstumshormons möglicherweise zu ständigen Veränderungen in der Reaktion derLangerhans'schen Inseln gegenüber Glucosestimulation geführt haben. Der durchschnittliche Serumwachstumshormonwert im Nüchternzustand war ungefähr der gleiche bei der Kontrollgruppe und bei „inaktiven“ Akromegalen; die letzteren wiesen keine Verminderung der Serumwachstumshormonwerte nach Glucoseverabreichung auf.
    Notes: Summary The insulin and growth hormone responses to oral glucose load (100 g) in 23 acronaegalic patients, previously treated by external irradiation, are described. Based on current clinical findings, sixteen acromegalics were considered “inactive” and seven patients “active”. Two of the latter were treated diabetics. Thirteen healthy, non-obese subjects formed the control group. Five “inactive” acromegalics had blood glucose values exceeding the upper limits of normal after the glucose load. Both the “inactive” and “active” acromegalics had hyperinsulinemia in the fasting state and after glucose load. The observation of an exaggerated serum insulin response to glucose load in clinically “inactive” acromegalics suggested that chronically elevated levels of circulating growth hormone may have led to permanent changes in the responsiveness of the pancreatic islets to glucose stimulation. The mean fasting value of serum growth hormone was about the same in the controls and the “inactive” acromegalics; the latter did not show suppression in serum growth hormone levels after glucose load.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 16 (1973), S. 403-407 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
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    London : Periodicals Archive Online (PAO)
    The Contemporary Review. 139 (1931:Jan./June) 73 
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  • 4
    ISSN: 0884-3996
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 12 (1997), S. 309-309 
    ISSN: 0884-3996
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: No Abstract
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 6 (1991), S. 97-106 
    ISSN: 0884-3996
    Keywords: Adenosine triphosphate ; detergent ; firefly luciferase ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The reaction rate of ATP-limited firefly luciferase-catalysed reactions, is affected by the presence of detergents. Anionic detergents inhibit luciferase activity without causing significant enzyme inactivation during the reaction. Cationic detergents increase reaction rate several-fold with a sharply defined optimum concentration of detergent for the effect. However, cationic detergents inactivate firefly luciferase during the reaction, resulting in a continuously decreasing reaction rate. Under such conditions, peak light intensity must be used as an indication of initial reaction rate. The inactivation rate increases with increasing detergent concentration. Non-ionic and zwitterionic detergents increase reaction rate over a broad range of detergent concentrations. Enzyme stability during the reaction is not affected by non-ionic detergents and only affected by zwitterionic detergents at high detergent concentration. Cyclodextrins, which can increase reaction rates of some chemiluminescent reactions, have little effect on firefly luciferase activity.Assays for ATP using firefly luciferase must be internally standardized by the constant addition technique in which a known amount of ATP is added to the test sample, since external calibration of such assays, by reference to a previously prepared standard curve, can lead to imprecision when detergents are present.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0884-3996
    Keywords: Luminometer ; evaluation ; rapid microbiology ; ATP assay ; firefly luciferase ; photometer ; radiometer ; comparison ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: An assessment has been carried out of the relative performance of ten instruments for quantification of adenosine triphosphate (ATP) by the firefly luciferase assay. The instruments evaluated were Amersham Amerlite Analyser, Dynatech Tube Luminometer, Dynatech Multiplate Luminometer, Dynatech Camera Luminometer, Hamilton Lumicon, LKB 1250 Luminometer, LKB 1251 Luminometer, Lumac Biocounter M2010A, Turner 20 TD Luminometer and a prototype version of the CLEAR Speed Tech 2000. An 800-fold difference in sensitivity was found between the most sensitive (Lumac, Turner) and the least sensitive (Dynatech Tube) of the conventional instruments. The Dynatech Camera Luminometer which worked on a completely different principle to the other instruments was about 5000 times less sensitive than the best of the photomultiplier tube instruments. The relative sensitivity of the instruments was maintained regardless of whether solutions of ATP in water or trichloroacetic acid extracts of bacteria were analysed. An analysis of 960 ATP bioluminescence assays showed that data obtained from such measurements are normally distributed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 8 (1993), S. 147-152 
    ISSN: 0884-3996
    Keywords: Bioluminescence ; hop ; ionophore ; Lactococcus ; lux ; pH ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Ionophores (carbonyl cyanide m-chlorophenylhydrazone; valinomycin; and the hopderived compounds colupulone, trans-isohumulone and trans-humulinic acid) reduced the rate of dodecanal-dependent light emission from luxA/B-transformed cells of Lactococcus lactis subsp. diacetylactis F712 when the cells were suspended in a buffered medium (pH 6.4) containing glucose. This allowed an assay for ionophores to be devised and permitted measurement of the effects of such compounds on the test organism by the use of a non-destructive technique in real time.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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