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

By P. D. Evans

ISBN-10: 0120242265

ISBN-13: 9780120242269

Insect body structure is at the moment present process a revolution with the elevated software of molecular organic recommendations 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 studies on molecular biology and molecular genetics in parts the place they supply an elevated knowing of physiological strategies in bugs. quantity 26 of this vintage seriescontinues to supply updated experiences on topical topics of value to all invertebrate physiologists and neurobiologists and includes elevated assurance at the molecular biology of insect body structure.

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Additional info for Advances in Insect Physiology, Vol. 26

Sample text

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. In most insects, meiosis is delayed until the spermatozoon enters the oocyte, and the nucleus of the unfertilized egg is the typical germinal vesicle, ready to enter the prophase of the first maturation division.

DAVEY In Blattella germanica, the temporal course of events is different, since the oothecae are carried protruding from the genital pouch during a period of about 18 days between oviposition and hatching of the eggs (parturition) (Stay and Roth, 1962; Zalokar, 1968). During this interval, protein synthesis in the colleterial gland is repressed. It can be activated by removal of the ootheca, which initiates the development of a new batch of eggs (Zalokar, 1968). In females allatectomized by beheading, activation of oothecal protein synthesis by removal of the ootheca was prevented, and it could be restored by implantation of CA.

3 Uptake into the follicle and oocyte. That J H affects the uptake of yolk proteins by the ovaries has been known for many years. Early workers observed an increased formation of yolk in the oocyte near the site of the implantation of a CA or of the injection of JH (Joly, 1945; de Loof and de Wilde, 1970). In Periplanefa arnericana, injection of Vg into allatectomized females does not result in the accumulation of yolk in the ovary, while implanting CA or injecting a J H analogue restores yolk production and uptake (Bell, 1969).

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

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