By Stephen J. Simpson

ISBN-10: 012374329X

ISBN-13: 9780123743299

Advances in Insect body structure publishes eclectic volumes containing very important, finished and in-depth studies on all facets of insect body structure. it truly is a vital reference resource for invertebrate physiologists and neurobiologists, entomologists, zoologists and bug biochemists. First released in 1963, the serial is now edited via Steve Simpson and Jerome Casas to supply a world standpoint. * greater than three hundred pages with contributions from the best researchers in entomology * Over forty figures and illustrations mixed * contains an in-depth assessment of the genetics of the honey bee * Discusses the physiological variety in bugs

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Additional info for Advances in Insect Physiology, Vol. 35

Sample text

In fly pupae, uric acid is accumulated not only in the fat body, but also in the intestine and the Malpighian tubules in response to the shut down of the excretory organs during this phase of the life cycle (Schwantes, 1990). The switch from excretion to storage is under hormonal control in larval Ma. sexta and it occurs during the transition from the feeding to the wandering stage (Buckner, 1982). There is an increase in fat body urate levels and a corresponding decline in hemolymph urate concentration at this time.

Although reabsorption of useful ions and water is accomplished by the hindgut in most species, in some cases a proximal (lower) segment of the Malpighian tubule is involved. 1 REABSORPTION BY THE MALPIGHIAN TUBULES For the blood feeder R. prolixus, the high surface area offered by the lower Malpighian tubule relative to the volume of fluid in its lumen permits rapid reabsorption of KCl during the post-prandial diuresis. In Drosophila, reabsorption of both K+ and water in the lower Malpighian tubule probably serves a preparatory role, prior to additional reabsorption in the hindgut.

However, if urate is immediately converted to uric acid and precipitated, a gradient favouring passive movement of urate into the lumen may be created. , 1983), a ‘secretionreabsorption’ model for passive uric acid transport in the upper Malpighian tubules of Rhodnius was first proposed by Wigglesworth (1931), and is reproduced in many current textbooks of entomology or comparative physiology. Wigglesworth proposed that urate moved passively across the cells and into the lumen of the upper secretory portion of the tubules, and was then carried by entrainment in the flow of fluid into the lower tubule, where precipitation of uric acid occurred as a result of acidification and water reabsorption.

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Advances in Insect Physiology, Vol. 35 by Stephen J. Simpson

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