�ber Beziehungen zwischen Feinbau und Jahresperiodik des Inselorgans von V�geln

Epple, August

doi:10.1007/bf00345154

Cited by 18 publications

(3 citation statements)

References 35 publications

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“…They undergo no spring or fall premigratory fattening.) Furthermore, alpha cell activity is lower than beta cell activity at this time and only at this time in the blackbird annual cycle (Epple, 1961).…”

Section: Discussionmentioning

confidence: 76%

“…If glucagon output is depressed during the premigratory period, the cause may be altered levels of a specific hormone or a simultaneous alteration in the level of several hormones. Several different hormones can affect the function of the pancreatic islets (Epple, 1961). Future investigations must determine if glucagon output is depressed, and if so, how the output of glucagon is regulated.…”

Section: Discussionmentioning

confidence: 99%

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The effect of insulin, glucagon and prolactin on lipid synthesis and related metabolic activity in migratory and non-migratory finches

Goodridge

1964

Comparative Biochemistry and Physiology

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1. The effects of insulin, glucagon and prolactin on lipid synthesis were investigated in house sparrows (Passer domesticus) and white-crowned sparrows (Zonotrichia leucophrys gambelii).2. The incorporation of glucose-U-C 14 and acetate-l-C 14 into abdominal fat pad lipid was measured in in vitro and in vivo experiments.3. None of these hormones accelerated lipid synthesis, even though lipogenesis is sensitive to changes in carbohydrate metabolism (i.e. glucose uptake) in this tissue.4. Insulin, a potent stimulator of lipid synthesis in mammalian adipose tissue, had no effect on the metabolism of finch fat pads.5. Glucagon and prolactin inhibited the synthesis of fatty acids from acetate. Only glucagon has the necessary potency to be of physiological significance.6. It is hypothesized that a relatively high glucagon output inhibits lipid synthesis during non-migratory periods. During migratory periods the output of glucagon falls, allowing lipid synthesis to proceed at a more rapid rate.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

The effect of insulin, glucagon and prolactin on lipid synthesis and related metabolic activity in migratory and non-migratory finches

Goodridge

1964

Comparative Biochemistry and Physiology

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“…At first I investigated these birds in captivity under natural light conditions (Merkel, 1956(Merkel, , 1958a(Merkel, , 1958b(Merkel, , 1960 but later the light regime was changed in different ways (Merkel, 1963). Together with my co-workers (Bigalke, 1956;Epple, 1961;Fromme-Bouman, 1962) I also investigated an almost sedentary population of the European Blackbird, Turdus merula, under natural conditions, with special reference to the annual cycle of endocrine gland activity, weight, moult and breeding season.…”

Section: Introductionmentioning

confidence: 99%