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 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 components the place they supply an elevated figuring out of physiological methods in bugs. quantity 26 of this vintage seriescontinues to supply up to date reports on topical topics of significance to all invertebrate physiologists and neurobiologists and includes elevated insurance at the molecular biology of insect body structure.

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Extra resources for Advances in Insect Physiology, Vol. 26

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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. 1 Hexameric storage proteins. , 1994). , 1990). , 1993a, b; Riddiford, 1994). 3). Several insects possess storage hexamerins that persist into the adult stage and are subject to JH regulation. In Locusta, a ‘persistent storage protein’ (PSP) (Ancsin and Wyatt, 1990; Wyatt, 1990; Ancsin and Wyatt, 1996) is abundant in haemolymph of the late last-instar larva, at which time its accumulation can be prevented by administration of a JH analogue, like that of several lepidopteran storage proteins.

R. WYAlT AND K. G. 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.

Koeppe et al. (1981b) concluded, on indirect evidence, that chorion formation was unaffected by JH in Leucophaea. In Aedes, the formation of the vitelline envelope, regarded as the first step in the secretion of the chorion, will proceed in the absence of the CA, provided that the early JH-dependent development of the follicle cells has been completed, that a blood meal (administered by enema in these experiments) is available, and that ecdysone is administered (Raikhel and Lea, 1991). , 1994a) demonstrates that in Aedes aegypti the ovary synthesizes JH I11 and other JH-related compounds in amounts which are physiologically significant.

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