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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 189-190 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is well known that in the vertebrates., insulin enhances the utilization of glucose, amino -acids and fatty acids7. In work recorded here, we report the presence of a protein having insulin-like activity in the larval foods of the honeybee. Larval foods from cells of young and old queen and ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 27 (1979), S. 227-232 
    ISSN: 1432-0827
    Keywords: Citrate incorporation ; Calcium deposition in bone ; Labeled acetate, citrate ; Alloxan diabetes ; Insulin effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Diabetes results in osteoporosis, which is characterized by a loss of bone calcium, and thinness of bone shaft. Bone is a major reservoir of calcium and citrate in the body. In this report the effect of diabetes on the deposition of calcium and citrate into rat bones is studied. When [1-5-14C]citrate (50µCi/kg body wt.) was injected intravenously, the bones of untreated alloxan-diabetic rats incorporated less labeled citrate than those of insulin-treated diabetic or control animals. Likewise, when [1-14C]acetate was injected (50µCi/kg body wt.), the labeled citrate synthesized in vivo was incorporated into untreated diabetic rat bones to a significantly lesser extent than in those of insulin-treated diabetic or control rats. In these in vivo studies citrate oxidation was minimized by administration of either an i.v. injection of monofluoroacetic acid (10 mg/kg body wt.) or an i.p. dose of trans-aconitate (2 g/kg body wt.) prior to the administration of labeled acetate or citrate. When45Ca (100µCi/kg body wt.) was injected subcutaneously for 2 consecutive days, the bones of diabetic rats deposited markedly less of the isotope than those of insulin-treated diabetic or control animals. It is concluded that decreased bone mass in diabetes may be a consequence of decreased calcium deposition in the bone.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 32 (1980), S. 195-199 
    ISSN: 1432-0827
    Keywords: Bone ; Diabetes ; Insulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary A simple instrument is described which measures the breaking strength of rat bones. The apparatus yields reproducible results and is suitable for use in measuring the strength of bones from both large and small animals. Diabetic rat femurs were more fragile and required less force to break in contrast to those from diabetic rats treated with insulin or normal rats. Daily insulin treatment significantly improved the bone cortical thickness and enhanced their capacity to withstand pressure, although these did not reach the level of the normal controls. The amount of force required to break the bone appears to be related to its cortical thickness and mass.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 10 (1972), S. 49-57 
    ISSN: 1432-0827
    Keywords: Histochemistry ; Cartilage ; Enzymes ; Vitamin D ; Starvation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé 1. La distribution quantitative de phosphatase alcaline et de déshydrogénas eglucose-6-phosphate dans les zones hypertrophiques, en voie de prolifération du cartilage de rats rachitiques, pendant la cicatrisation induite par l'administration de vitamin D ou par jeun prolongé, est étudiée. 2. L'activité en phosphatase alcaline de la zone hypertrophique est environ triple de celle de la zone de prolifération du rat sevré normal et environ quadruple de celle des rats rachitiques. 3. Apres administration d'une seule dose de vitamine D (8000 unités), il se produit une augmentation significative de l'activité en phosphatase alcaline de la a zone en voie de prolifération. Une augmentation moins nette est observée dans la zone de prolifération de rats ayant jeuné 48 heures. 4. On observe une diminution significative de l'activité en phosphatase alcaline de la partie centrale de la zone hypertrophique de cartilage aprés traitement a la vitamine D. Une telle diminution n'a pas été observée chez le rat qui jeûne. 5. Chez le rat sevré normal, l'activité en déshydrogénase glucose-6-phosphate (G-6-PDH) est plus élevée dans la zone de prolifération que dans la zone hypertrophique. Chez le rat rachitique non traité, le contenu en enzyme est à peu pres identique dans les deux zones. 6. Apres traitement a la vitamine D, on note une décroissance nette de l'activité en G-6-PDH. Une telle décroissance n'est pas observée chez le rat qui jeûne.
    Abstract: Zusammenfassung 1. Diese Arbeit beschreibt die quantitative Verteilung der alkalischen Phosphatase und der Glucose-6-Phosphat-Dehydrogenase in proliferierenden und hypertrophischen Zonen von rachitischem Rattenknorpel während der durch Vitamin D-Gabe hervorgerufenen Heilung oder während der Mangeldiät. 2. Die Aktivität der alkalischen Phosphatase in der hypertrophischen Zone war etwa dreimal so groß wie in der proliferierende Zone der normalen entwöhnten Ratte und etwa viermal so groß bei den rachitischen Ratten. 3. Nach einer einmaligen Vitamin D-Gabe (8000 i.E) erfolgte eine signifikante Erhöhung der alkalischen Phosphatasen-Aktivität in der proliferierenden Zone. Eine weniger signifikante Erhöhung wurde in der proliferierenden Zone von Ratten festgestellt, welche 48 Std gefastet hatten. 4. Nach Vitamin D-Behandlung erfolgte eine signifikante Abnahme der alkalischen Phosphatasen-Aktivität in der mittleren Region der hypertrophischen Zone des Knorpels. Bei den fastenden Ratten wurde keine solche Abnahme beobachtet. 5. Bei der normalen entwöhnten Ratte war die Aktivität der Glucose-6-Phosphat-Dehydrogenase (G-6-PDH) größer in der proliferierenden als in der hypertrophischen Zone. Bei der unbehandelten rachitischen Ratte war der Enzymgehalt in beiden Zonen etwa gleich. 6. Nach Vitamin D-Behandlung erfolgte eine merkliche Abnahme der G-6-PDH-Aktivität. Bei der fastenden Ratte wurde keine solche Abnahme beobachtet.
    Notes: Abstract 1. The quantitative distribution of alkaline phosphatase and glucose-6-phosphate dehydrogenase in proliferating and hypertrophic zones of rachitic rat cartilage during healing induced by vitamin D administration or starvation is presented. 2. Alkaline phosphatase activity in the hypertrophic zone is about three times greater than that of the proliferating zone of the normal weanling rat and approximately four times greater in the rachitic rats. 3. Following a single dose of vitamin D (8000 I. U.) there was a significant elevation in alkaline phosphatase activity of the proliferating zone. A less significant increase was observed in the proliferating zone of rats which had breen fasted 48 hours. 4. There was a significant decrease in the alkaline phosphatase activity of the central region of hypertrophic zone of cartilage after vitamin D treatment. No such decrease was observed in the fasted rats. 5. In the normal weanling rat glucose-6-phosphate dehydrogenase (G-6-PDH) activity was greater in the proliferating zone as compared to the hypertrophic zone. In the untreated rachitic rat the enzyme content was about the same in the two zones. 6. Following vitamin D treatment there was an appreciable decrease in the G-6-PDH activity. No such decrease was observed in the fasted rat.
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  • 5
    Publication Date: 1964-04-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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