Download Advances in Insect Physiology, Vol. 26 by P. D. Evans PDF

By P. D. Evans

Insect body structure is at the moment present process a revolution with the elevated software of molecular organic concepts to enquire the molecular mechanisms underlying the physiological responses to insect cells.Advances in Insect body structure is commited to publishing top of the range stories on molecular biology and molecular genetics in parts the place they supply an elevated figuring out of physiological methods in bugs. quantity 26 of this vintage seriescontinues to supply updated experiences on topical matters of value to all invertebrate physiologists and neurobiologists and includes elevated insurance at the molecular biology of insect body structure.

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Additional resources for Advances in Insect Physiology, Vol. 26

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Under short-day conditions, adult bugs remain in diapause, and haemolymph of both sexes contains CP-1, CP-4 and the heterohexamers. , 1991). , 1992a, b). , 1992). CP-1 may serve as an egg yolk protein, but it is not known what functions the CPs may exercise in males and diapause females. The differential control of the two subunits provides an opportunity for analysis of mechanisms of JH regulation. 4 Other haemolymph proteins Studies on diverse insects have shown that haemolymph proteins of several other types are subject to regulation by juvenile hormone.

9). The biological significance of this striking regulatory mechanism is unknown. 1 Ovaries In some insects, all of the eggs are produced in the pupal stage, but in many species at least some of the egg production occurs in the adult. There are several phases in the production of an egg. The oogonia multiply by mitosis, and in meroistic ovaries some of the oogonia become specialized as nurse cells (trophocytes). In the telotrophic ovary, the nurse cells may retain their ability to divide by mitosis after the oocytes have differentiated.

Taken together, these facts conform to the view that JH prepares the fat body to respond to ecdysone from the ovaries, as has been more clearly and crisply demonstrated for mosquitoes. By allatectomizing adult females of the blowfly, Phormia reginu, and treating with methoprene at various times after a liver meal, Qin et ul. (1995) have further explored 24 G. R. W Y A T AND K. G. DAVEY the role of JH in the control of vitellogenesis. The results support the general model for Diptera, in which JH: primes the fat body to respond to 20HE; primes the follicle cells to respond to egg development neurosecretory hormone by synthesizing ecdysone; enhances the production of ecdysone by the follicle cells; and regulates patency in the follicular epithelium.

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