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Read e-book online Vasopressin: Disturbed Secretion and Its Effects PDF

By L. Kovács

ISBN-10: 0792302494

ISBN-13: 9780792302490

ISBN-10: 9400904495

ISBN-13: 9789400904491

ISBN-10: 9401066868

ISBN-13: 9789401066860

The mechanisms through which animals control the quantity and composition in their physique fluids has lengthy had a selected fascination for college kids of biology. for this reason, the topic can lay declare to a powerful checklist of floor­ breaking medical achievements in addition to a provocative physique of philosophical hypothesis in regards to the position of the approach within the starting place and evolution of lifestyles. certainly, the whole thought of homeostasis on which quite a bit of o~r present biologic pondering relies, derives from Claude Bernard's pioneering exploration of the forces that be certain the composition of this 'internal sea'. different seminal achievements credited to this sector of inquiry comprise the 1st description of a genetically transmitted human affliction (familial neurogenic diabetes insipidus); the 1st isolation sequencing and synthesis of a peptide hormone (vasopressin and oxytocin); the 1st demonstration of peptide hormone synthesis in terms of a bigger protein precursor; the 1st description of resistance to the biologic activities of a hormone (nephrogenic diabetes insipidus); and the conceptual awareness of the original counter-current mechanism that enables focus of the urine. This list of a ways attaining and basic advances has been special by means of many fruitful inter­ activities among medical and simple science.

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Extra resources for Vasopressin: Disturbed Secretion and Its Effects

Sample text

For example, as many as 5 per cent of the hormonal content of pa,ncreatic beta- cells are made up by incompletely processed proinsulin fragments which are subsequently released into the circulation and can be detected by radioimmunological methods. It may seem surprising at first sight that, according to recent reports, peptides with higher molecular weight, probably suggesting their incomplete enzymic cleavage, account for as many as 10-15 per cent of the total neurophysin immunoreactivity in the human posterior pituitary (Verbalis and Robinson 1983).

This relationship can be described by a standard linear regression equation which. when transformed into a physiologically more acceptable form, reads y = = b(x - him), where [x] iH plasma osmolality, [y] represents the dependent 40 variable (plasma vasopressin), [b] is the regression coefficient, and the expression [b/m] determines the intercept of the regression line with x. e. e. the value of plasma osmolality that triggers the system, rendering it active upon increasing plasma osmolality or suppressing it upon decreasing plasma osmolality.

Nevertheless. a relationship between this eledric activity

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Vasopressin: Disturbed Secretion and Its Effects by L. Kovács

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