Critical Studies on the Determination of the Thyroid Secretion Rate in Cold-adapted Animals PDF Download
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Author: O. Heroux
Publisher:
ISBN:
Category : Mammals
Languages : en
Pages : 42
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There is ample evidence in the literature showing that cold adaptation in mammals can be accompanied by increased as well as by decreased thyroid activity. Measurement of thyroid secretion rate by determining the amount of L-thyroxine required to bloc the thyroidal I131 release, according to Perry's method, revealed that the thyroxine requirement of 6 degrees C-acclimated rats was twice as high as that of controls (5.5 = 0.7 micrograms/100g/day against 2.73 = 0.3 micrograms /100g/day for the controls). The requirement of the white rats acclimatized to cold outdoors during the winter on the other hand, was less than in the controls (1.8 micrograms/100g/day). The larger amount of thyroxine found in the feces of the 6 degrees C-acclimated rats (5.75 = 0.3 micrograms/day as compared to 2.84 = 0.4 micrograms/ day for the controls), the similar rate of urinary elimination of I131 in both groups, and the greater fecal elimination of the same isotope in the 6 degrees C-rats indicates that the greater requirement for thyroxine in these animals is at least partly due to increased fecal loss of the hormone. (Author).
Author: O. Heroux
Publisher:
ISBN:
Category : Mammals
Languages : en
Pages : 42
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Book Description
There is ample evidence in the literature showing that cold adaptation in mammals can be accompanied by increased as well as by decreased thyroid activity. Measurement of thyroid secretion rate by determining the amount of L-thyroxine required to bloc the thyroidal I131 release, according to Perry's method, revealed that the thyroxine requirement of 6 degrees C-acclimated rats was twice as high as that of controls (5.5 = 0.7 micrograms/100g/day against 2.73 = 0.3 micrograms /100g/day for the controls). The requirement of the white rats acclimatized to cold outdoors during the winter on the other hand, was less than in the controls (1.8 micrograms/100g/day). The larger amount of thyroxine found in the feces of the 6 degrees C-acclimated rats (5.75 = 0.3 micrograms/day as compared to 2.84 = 0.4 micrograms/ day for the controls), the similar rate of urinary elimination of I131 in both groups, and the greater fecal elimination of the same isotope in the 6 degrees C-rats indicates that the greater requirement for thyroxine in these animals is at least partly due to increased fecal loss of the hormone. (Author).
Author: I. Assenmacher
Publisher: Springer Science & Business Media
ISBN: 3642669816
Category : Medical
Languages : en
Pages : 344
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Book Description
From 11 to 15 July 1977 about 60 physiologists, endo crinologists, ecologists and other biologists from 14 countries convened at the University Montpellier for a symposium on Environmental Endocrinology. This meet ing was organized as a Satellite Symposium of the 27th International Congress of Physiological Sciences, Paris, 18-23 July 1977. This volume is a record of the com munications presented at the symposium. The objectives of the program were to examine the role of the endocrine system in a wide spectrum of adjustments and adaptations to changes in environmental conditions by various spe cies of animals, including man, and to promote an ex change of ideas among investigators who have approached these functions from diverse aspects. The diversity of the information and ideas communicated is great. Of necessity, they represent only an extremely modest se lection of the many facets of endocrine function in the interaction of animals with their environments. Be yond the usefulness of the communications individually, we hope that they collectively demonstrate the substan tial heuristic value of the concept of environmental endocrinology as it was perceived by the participants. We acknowledge gratefully the kindness and sympathy of Professor Jaques ROUZAUD, President of the University of Montpellier II, for his generous extension of the hospitality of the University to the Symposium. We are most grateful to Mrs. Monique VIEU who effected so well the secretarial organization of the Sympos.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 870
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Author: Balraj Bhatia
Publisher: Elsevier
ISBN: 1483188027
Category : Nature
Languages : en
Pages : 546
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Selected Topics in Environmental Biology covers the proceedings of the 26th International Congress of Physiological Sciences on Environmental Biology, held in New Delhi, India on October 20-26, 1974. The symposium is arranged in the subjects of high altitude and under water physiology and the physiological effects of cold, heat, and accelerations. This book is organized into 13 sections encompassing 74 chapters. The opening part deals with the principles and mechanisms of thermoregulation, with emphasis on the role of neurotransmitters in temperature regulation. The succeeding parts examine metabolic aspects and adaptive mechanisms to cold and heat stress. These parts also survey the thyroid function, resistance, acclimatization, and nerve impulse effects of these conditions. Other parts discuss the hypothalamic control and susceptibility to hypothermia and thermal injury; the capacity of short-term and prolonged exposure to hypoxia; the pathogenesis of pulmonary edema; and the constitution and body functions in different ethnic groups. These topics are followed by reviews on the body adaptive changes under hypogravic state, biochemical changes induced by environmental pollution, and physiological behavior under noise, hyperbaric, and emotional stress. The last part describes the effect of environmental stress on diurnal variations in body functions. This book will prove useful to environmental biologists, physiologists, biochemists, and researchers.
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1732
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Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 258
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Author:
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ISBN:
Category : Livestock
Languages : en
Pages : 926
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Author: Georg Hennemann
Publisher: Marcel Dekker
ISBN:
Category : Medical
Languages : en
Pages : 656
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Author: Henry Vernon Roohk
Publisher:
ISBN:
Category :
Languages : en
Pages : 236
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Author: Sidney C. Werner
Publisher: HarperCollins Publishers
ISBN:
Category : Medical
Languages : en
Pages : 1116
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