Download e-book for kindle: Advances in Insect Physiology, Vol. 26 by P. D. Evans

By P. D. Evans

ISBN-10: 0120242265

ISBN-13: 9780120242269

Insect body structure is at present present process a revolution with the elevated program 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 reports on molecular biology and molecular genetics in components the place they supply an elevated knowing of physiological tactics in bugs. quantity 26 of this vintage seriescontinues to supply updated reports on topical matters of significance to all invertebrate physiologists and neurobiologists and comprises elevated insurance at the molecular biology of insect body structure.

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Extra resources for Advances in Insect Physiology, Vol. 26

Example text

Observations on blowflies, however, suggest that such a mechanism is operating. It is first of all clear that ecdysone is responsible for controlling YP synthesis in the fat body of blowflies. Females from four genera (Lucilia, Phormia, Surcophaga and Culliphora) all behave similarly. Sugar-fed females do not produce YP. Injection or feeding of ecdysone supports the production of YP whereas injection or feeding of methoprene does not (Huybrechts and De Loof, 1982). Thomsen and Thomsen (1974) had earlier shown that fat body from ovariectomized females of Calliphoru erythrocephala did not contain the granules associated with YP after a protein meal, although the tissue developed the synthetic machinery characteristic of vitellogenic females.

In JH-deficient (precocene-treated) adults, PSP maintains a low constitutive rate of synthesis, which is strongly elevated by JH or an analogue. The direction of the J H effect upon PSP synthesis in the locust fat body is therefore switched during metamorphosis fiom repression to stimulation. , 1990). 4kb mRNAs, which disappeared after application of methoprene in vivo or to fat body in vifro. , 1996). Its mRNA is abundant in the fat body of adult female cockroaches on the day of emergence and normally declines sharply by day 3, to persist at a detectable but very low level.

W A l T AND K. G. 1 1 10 100 Dose of pyriproxyfen (pg) FIG. 3 Dose curve for stimulation of growth in the male accessory gland of Locusta migratoria by pyriproxyfen. Various doses of pyriproxyfen were applied topically in acetone to precocene-treated adult male locusts and after 72 h accessory glands were removed and weighed. Values from two experiments with different aged locusts have been normalized for different zero-dose weights. Both experiments showed a similar biphasic pattern. Values are means k SEM (n = 6).

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

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