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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 313 (1969), S. 53-61 
    ISSN: 1432-2013
    Keywords: Pancreas ; Enzyme Secretion ; Ouabain ; Acetazolamide ; Bauchspeicheldrüse ; Sekretion von Enzyme ; Quabain ; Acetazolamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The isolated rabbit pancreas secretes protein and α-amylase at a relatively constant rate during an eight-hour period. Ouabain (10−5 and 10−6 M) did not alter enzyme secretion, but inhibited flow (65% and 28% respectively). Acetazolamide (10−3 M) had no effect on pancreatic enzyme secretion, while flow was inhibited by 25%. Na azide (10−2 M) failed to affect protein and α-amylase secretion. Flow was inhibited by approximately 88%. NaF (10−2M) increased both protein and α-amylase secretion, while flow remained virtually unchanged. Gassing of the bathing fluid with 95% N2−5% CO2 reduced protein and α-amylase secretion by 57 and 64% respectively, while flow was decreased by 77%. Lowering of the sodium concentration in the bathing fluid by 85% decreased α-amylase secretion by 46%. Flow was inhibited by 77%. Return to the standard solution caused initially an increase of α-amylase secretion (86%), followed by a decrease. These results strongly suggest that the enzyme secretion of the pancreas is not coupled to the sodium pump, responsible for fluid and electrolyte secretion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 313 (1969), S. 62-70 
    ISSN: 1432-2013
    Keywords: Pancreas ; Pancreozymin ; Methylxanthines ; Cyclic AMP ; Bauchspeicheldrüse ; Pancreozymin ; Acetylcholin ; Methylxanthin ; cyclisch AMP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The isolated rabbit pancreas secreted protein and α-amylase at a relatively constant rate during an eight-hour period. Both pancreozymin and acetylcholine caused a massive release of protein and α-amylase into pancreatic fluid. Theophylline (10−2 M) stimulated protein secretion in vitro maximally by 155%, while for α-amylase secretion a maximal average stimulation of 80% was observed. Theobromine (10−2 M) exerted a slight increase on enzyme secretion, equal to that given by 10−3 M theophylline. Cyclic AMP (10−3M) also increased enzyme secretion. For protein secretion a maximal average stimulation of 64% was observed, while α-amylase secretion was maximally stimulated by 31%. Theophylline (10−2 M) potentiated the stimulatory effect of pancreozymin (8.5 U/l) on pancreatic enzyme secretion. These results indicate that cyclic AMP is a mediator in enzyme secretion.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Spontaneous diabetes ; Sand rat ; Psammomys obesus ; Insulin in plasma ; Insulin resistance ; Acetohexamide ; Diet and diabetes ; Nutrition and diabetes ; Obesity ; Pancreas ; Infections ; Adipose tissue in vitro
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Certaines caractéristiques particulières du rat des sables en font un animal d'expérience de grande valeur. L'augmentation des taux plasmatiques d'insuline et de glucose est liée chez lui à une augmentation de la prise de nourriture. Tout comme c'est le cas pour le diabète humain de type adulte, il semble y avoir participation d'un élément de résistance à l'insuline qui peut être mis en évidencein vitro par la sensibilité diminuée du tissu adipeux du rat des sables à l'insuline de porc. Il semblerait qu'un traitement prophylactique par l'acétphexamide exerce un effet protecteur contre l'effet diabétogène d'un régime riche en calories. — Il semble raisonnable de penser que le syndrome diabétique du rat du sable, si facilement provoqué par la modification du régime, pourrait s'avérer être un instrument de grande valeur dans l'étude des mécanismes pathogénétiques possibles du syndrome diabétique.
    Abstract: Zusammenfassung Die Sandratte verfügt über mehrere einmalige Eigenschaften, die aus ihr ein wertvolles Laboratoriumstier machen. Das häufige Auftreten von erhöhtem Plasma-Insulinspiegel und Hyperglykämie steht im Zusammenhang mit einer gesteigerten Nahrungsaufnahme. Wie im menschlichen Reife-Diabetes scheint auch hier eine Insulinresistenz aufzutreten, und diese istin vitro nachweisbar: das inkubierte Fettgewebe der Sandratte spricht auf eine Stimulierung mit steigenden Dosen von Schweineinsulin nur wenig an. Prophylaktische Behandlung mit Acetohexamid deutet auf eine Schutzwirkung gegen die diabetogenen Folgen einer kalorienreichen Diät. — Es ist zu erwarten, daß das diabetische Syndrom in der Sandratte, das so leicht durch Manipulationen der Diät erzeugt werden kann, ein nützliches Modell zur Untersuchung der möglichen Mechanismen der diabetischen Pathogenese darstellen wird.
    Notes: Summary The sand rat has some unique attributes, which make it a valuable experimental animal. The occurrence of increased plasma insulin levels and of hyperglycemia is linked to an increased food intake. As in the human maturity-onset type diabetes, there seems to be an element of insulin resistance, and this can be demonstratedin vitro by the relative unresponsiveness of sand rat adipose tissue to increasing doses of pork insulin. Prophylactic treatment with acetohexamide seems to have some protective effect against the diabetogenic results of a high calory diet. — It is expected that the diabetic syndrome in sand rats, which can be so easily induced by dietary manipulation, will be a valuable tool in helping to clarify some of the possible mechanisms in the syndrome of diabetes mellitus.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 311 (1969), S. 199-204 
    ISSN: 1432-2013
    Keywords: Rabbit ; Pancreas ; Acetazolamide ; Ouabain ; Kaninchen ; Bauchspeicheldrüse ; Acetazolamide ; Ouabain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Basal fluid and electrolyte secretion of the rabbit pancreas were studied in vitro. Acetazolamide added to the bathing solution in 0.3×10−3 to 3×10−3 M concentration reduced flow, with a maximal inhibition of 25–27% reached at 10−3-3×10−3 M diamox. Ouabain also inhibited pancreatic fluid secretion in vitro, 28% flow inhibition being observed after addition of 10−6 M ouabain. When both drugs were added together in these concentrations to the bathing solution a maximal average flow inhibition of 43% was observed, significantly higher than for each drug alone. This indicates that the effects of the drugs are additive and suggests that ouabain and acetazolamide act on different systems in the cells involved in the secretion of pancreatic fluid.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 311 (1969), S. 205-208 
    ISSN: 1432-2013
    Keywords: Rabbit ; Pancreas ; Secretin ; Kaninchen ; Pankreas ; Sekretin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Basal pancreatic fluid and electrolyte secretion by the isolated rabbit pancreas was studied. The hormone secretin stimulated pancreatic fluid secretion, with a maximal flow stimulation of 35 (S.E.: 1.4)% occurring after addition of 480 units/liter bathing fluid. The same dose of secretin also stimulated the22Na secretion by the rabbit pancreas in vitro. An average stimulation of 39 (S.E.: 2.1)% was observed, which is equal to the stimulation of fluid secretion. These results indicate that secretin stimulates pancreatic fluid production through increasing the active sodium secretion by the pancreas.
    Type of Medium: Electronic Resource
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