Ebook: The Juvenile Hormones

The juvenile hormones of insects are unique molecules in terms of their chemical nature (methyl esters of sesquiterpene epoxides) and action (both as modulators of morphogenesis during the larval life of insects and as a gonadotropic agent in many female adults). Although a symposium dedicated to the chemistry, metabolism and effects of juvenile hormone at a number of levels would be merited on the basis of its interest to the chemist, physiologist, endo­ crinologist, developmental biologist and entomologist, the juvenile hormones are special in the sense that juvenile hormone mimics (juvenoids, insect growth regulators, analogs) are currently being utilized to control various insec. t pests. Indeed, a number of commercial firms are currently developing new compounds with juven­ ile hormone activity that might possess a narrow spectrum of acti­ vity and which would be relatively biodegradable. Thus, a symposium on the juvenile hormones is also merited on a practical basis since juvenoids are already becoming constituents of our environment and it is apparent that in order to design effective mimics of the natural juvenile hormones, o~e should understand the means by which juvenile hormone elicits its effects. As will become evident to the reader, the great majority of data presented at this symposium have not been published previously and the symposium itself was organized along natural divisions dealing with the chemistry, metaoolism and multi-level modes of action of the juvenile hormones. Special lectures were presented by Professors C. M. Williams, B. W. O'Malley and W. S.

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Content:
Front Matter....Pages i-x
Juvenile Hormone.....in Retrospect and in Prospect....Pages 1-14
Summary of Session I: Chemistry of the Juvenile Hormones and Juvenile Hormone Analogs....Pages 15-18
On the Identity of the Juvenile Hormone in Insects....Pages 19-47
Structure Activity Relationships in Some Juvenile Hormone Analogs....Pages 48-60
Phenylethers as Insect Growth Regulators: Laboratory and Field Experiments....Pages 61-74
A Competitive Binding Protein Assay for Juvenile Hormone....Pages 75-95
Summary of Session II: Biosynthesis and Metabolism of Juvenile Hormone....Pages 96-100
Determination of the Physiological Levels of Juvenile Hormones in Several Insects and Biosynthesis of the Carbon Skeletons of the Juvenile Hormones....Pages 101-117
Isolation and Identification of Juvenile Hormones by Means of a Radioactive Isotope Dilution Method: Evidence for JH III in Eight Species from Four Orders....Pages 118-130
Farnesenic Acid Stimulation of Juvenile Hormone Biosynthesis as an Experimental Probe in Corpus Allatum Physiology....Pages 131-146
Summary of Session III: Juvenile Hormone Effects at the Cellular Level....Pages 147-163
Relationship between DNA Synthesis, Juvenile Hormone and Metamorphosis in Galleria Larvae....Pages 164-178
Action of Juvenile Hormone on Imaginal Discs of the Indian Meal Moth....Pages 179-183
Ecdysone Deficiency in Juvenile Hormone Treated Larvae of the German Cockroach, Blattella germanica (L.)....Pages 184-197
The Antagonism between Juvenile Hormone and Ecdysone....Pages 198-219
The Interaction of Juvenile Hormone and Ecdysone: Antagonistic, Synergistic, or Permissive?....Pages 220-233
The Role of Juvenile Hormone in Diapause and Phase Variation in Some Lepidopterous Insects....Pages 234-251
Action of Juvenoids on Different Groups of Insects....Pages 252-269
Summary of Session IV: Juvenile Hormone Effects at the Molecular Level (Binding and Transport)....Pages 270-287
Interaction of Juvenile Hormone with Binding Proteins in Insect Hemolymph....Pages 288-300
The Binding Protein as a Modulator of Juvenile Hormone Stability and Uptake....Pages 301-322
The Degradative Metabolism of Juvenoids by Insects....Pages 323-326
Discovery of Insect Antiallatotropins....Pages 327-341
Summary of Session V: Effects of Juvenile Hormone at the Molecular Level (Protein Synthesis)....Pages 342-353
The Effects of Juvenile Hormone on Imaginal Discs of Drosophila In Vitro: The Role of the Inhibition of Protein Synthesis....Pages 354-373
Juvenile Hormone Induced Biosynthesis of Vitellogenin in Leucophaea maderae from Large Precursor Polypeptides....Pages 374-393
Mechanism of Steroid Hormone Action: In Vitro Control of Gene Expression in Chick Oviduct Chromatin by Purified Steroid Receptor Complexes....Pages 394-408
Back Matter....Pages 409-415
....Pages 416-431