By Lawrence I. Gilbert, Jamshed R. Tata, Burr G. Atkinson
Metamorphosis addresses a number of features of postembryonic improvement, rather sign transduction, morphogenesis, cell-cell interactions, and programmed cellphone demise. A key function of the publication is its exploration of the molecular mechanisms underlying those approaches. Key gains * Hormonal rules of improvement * The mechanisms of hormone motion * The steroid/thyroid hormone receptor family members * Morphogenesis and programmed mobilephone loss of life
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Additional info for Metamorphosis: Postembryonic Reprogramming of Gene Expression in Amphibian and Insect Cells
Because of methodological difficulties, JH titers were established only in few insect species. JH production from the explanted CA is often taken as a measure of their secretory capacity and consequently, as an indication of JH titer changes. A good correlation usually exists between these data and actual JH determination in the hemolymph. In most insects the titer of JHs seems to remain high from hatching until the last larval molt. Broad JH titer peaks, overlapping with the molt-inducing surges of ecdysteroids, were detected in some species.
Metamorphosis must have originated at least seven times, at least twice in "Polyneoptera". nated wing discs; W, flying instars; Q, nonfeeding resting ("quiescent") instars; triple or double bars mark morphological changes which can be considered more (=) or less (=) metamorphic. Numbers of instars in the schemes are arbitrary except for the Paraneoptera. A. Archaeognatha, Fossil Monura, and Zygentoma All primarily wingless insects share the same mode of postembryogenesis, the ametaboly (J0-J0-J0-J0-J0-J0-A0-A0-A0- .
Chapter 2, this volume). Both of these views are regarded as extremes, each accentuating only one aspect of the phenomenon under study. The following observations demonstrate that both the preceding ontogenic history driving the endogenous developmental program and the hormone titers determine the type of secreted cuticle. (i) Hormonally induced reversal from a late to an earlier cuticle type is possible in some cases (Wigglesworth, 1954), but occurs much less readily than the normal succession and requires extensive cell divisions.
Metamorphosis: Postembryonic Reprogramming of Gene Expression in Amphibian and Insect Cells by Lawrence I. Gilbert, Jamshed R. Tata, Burr G. Atkinson