Download e-book for iPad: 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 the moment present process a revolution with the elevated software of molecular organic innovations to enquire the molecular mechanisms underlying the physiological responses to insect cells.Advances in Insect body structure is commited to publishing prime quality reports on molecular biology and molecular genetics in components the place they supply an elevated realizing of physiological strategies in bugs. quantity 26 of this vintage seriescontinues to supply up to date studies on topical topics of value to all invertebrate physiologists and neurobiologists and comprises elevated insurance at the molecular biology of insect body structure.

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Additional info for Advances in Insect Physiology, Vol. 26

Example text

Different insects make use of several mechanisms to avoid the potentially lethal effects of extreme winter cold (Zachariassen, 1985). These include lowering the supercooling point by production of antifreeze proteins (as well as low molecular weight solutes such as polyols) and, in some instances, removal of lipoprotein ice nucleators from the haemolymph; in both processes JH appears to be involved. In larvae of the beetle, Dendroides canadensis, treatment with precocene prevented the elevation of thermal hysteresis of the haemolymph (a measure of its antifreeze protein content) under normally inducing photoperiod and temperature, whereas prolonged treatment with J H I under normally non-inducing conditions caused an increase in this parameter (Horwath and Duman, 1983).

In vitro studies on the male accessory glands of Melanoplus sanguinipes have shown that JH I11 can inhibit the synthesis of some proteins and induce or enhance the synthesis of others (Ismail and Gillott, 1995a). The accessory glands of males one day after emergence respond to JH by increasing the rate of synthesis of a specific protein in the long hyaline tubule, whereas effects on other proteins are not detectable until day 4. In the same system, 20HE affects different proteins. However, in those cases in which the glands have not had previous exposure to JH, the action of J H appears to be biphasic.

In males treated with precocene, the accessory glands did not grow, and further treatment with the juvenoid, pyriproxyfen, restored normal growth and stimulated protein synthesis by glands removed from treated males and incubated in vitro. When precocene-treated males were treated with different doses of pyriproxyfen, the growth response was biphasic (Fig. 3). A very low dose (long) resulted in a small but significant increase in weight of the glands, greater doses up to 1pg did not give any further effect, but 1-100 pg of pyriproxyfen resulted in graded increases in weight.

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

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