juvenile hormone

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juvenile hormone

n.
Any of several hormones in insects that regulate various physiological processes, especially larval development and reproduction.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

juvenile hormone

a hormone present in juvenile insects and secreted by the CORPUS ALLATUM of the brain. So long as it is produced, the cuticle maintains the characteristics of the nymphal or larval form at each moult. Only when it ceases to be present or the level falls below a threshold value does the insect moult to the adult form. Juvenile hormones have been used as an effective means of controlling insects, for example, in preventing the development of adult ants during hospital infestations.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Three insect growth regulators (IGRs), juvenile hormone analogues (pyriproxyfen), ecdysone agonist (methoxyfenozide) and chitin synthesis inhibitor (lufenuron) were tested against egg, larva, pupa and adult stages of Tribolium castaneum.
These two events are regulated by the steroid 20-hydroxyecdysone, and the sesquiterpenoid juvenile hormone [26].
The steroid 20-hydroxyecdysone (20E) and the sesquiterpenoid juvenile hormone (JH) are 2 major hormones that regulate the metamorphosis and development of H.
In the previous studies, precocene II and precocene I demonstrated to inhibit the synthesis of juvenile hormone in a number of insects.
Noriega, "A quantitative assay for the juvenile hormones and their precursors using fluorescent tags," PLoS ONE, vol.
Contributors in a wide range of biological sciences explain methods for investigating mechanisms of action of juvenile hormones and their analogues and for estimating their environmental fate and potential adverse affects using an in silica quantitative structure-activity-relation (QSAR) approach.
They artificially induced presoldier differentiation by using a juvenile hormone, which works as an insect-growth regulator, and observed the shape and structure of the right mandibles throughout the differentiation process.
(55) This "chemical castration" is rarely prescribed for juvenile sex offenders because of issues of informed consent, medical supervision, and the fluctuation of juvenile hormones. (56)
Ultraspiracle: an invertebrate nuclear receptor for juvenile hormones. Proc Natl Aced Sci USA 94:13499-13503.
Regulation of vitellogenesis in insects: The pleiotropic role of juvenile hormones. In: Biosynthesis, Metabolism and Mode of Action of Invertebrate Hormones.

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