By Govindan Bhaskaran
Stanley Friedman college of Illinois Urbana, Illinois A perusal of the desk of contents of this brief symposium on Insect Endocrinology may well lead those who find themselves in general unin structed in Fraenkel's actions to ask yourself as to our selection of papers. Our justification relies upon our attempt to pay attention the symposium upon a unmarried region within which he has had a longer involvement: specifically, the metamorphic molt in flies. In so doing, we instantly well-known the large humoral and physiological ramifications, either direct and oblique, of such an curiosity. Our choice of those papers is an try and current the huge photograph with a couple of fast strokes. the 1st supplying, through J. H. Willis, et al., is a right away outgrowth of Fraenkel's paintings with Rudall at the chemistry of the puparium. Their investigations at the constitution of fly cuticle and its alterations at pupariation (Fraenkel and Rudall, 1940, Proc. Roy. Soc. London ( ) 129:1; 1947, ibid, 134:111), supplied quanti tative info that have, considering that point, stimulated our rules con cerning cuticular adjustments at metamorphosis and are shortly on the middle of the talk over the mechanism of cuticular hardening and darkening (see Hillerton and Vincent, 1979, l. Ins. Physiol."
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Extra info for Current Topics in Insect Endocrinology and Nutrition: A Tribute to Gottfried S. Fraenkel
Insect Physiol. 20:1277-1285. Trim, A. , 1941, Studies in the chemistry of the insect cuticle. I. Some general observations on certain arthropod cuticles with special reference to the characterization of the proteins, Biochem. J. 35:1088-1098. Willis, J. H. and Hollowell, M. , 1976, The interaction of juvenile hormone and ecdysone: antagonistic, synergistic, or permissive? In: "The Juvenile Hormones", L. 1. , Plenum Press, New York, pp. 270-287. RECENT RESULTS ON THE NEUROENDOCRINE SYSTEM OF LEUCOPHAEA Berta Scharrer Department of Anatomy Albert Einstein College of Medicine Bronx, New York 10461 INTRODUCTION The elucidation of the neuroendocrine control mechanisms operating in insects started with the discovery by Kopec (1917) of a pupation hormone in the brain of a lepidopteran (Pieris).
A number of early studies involving transplantation of CA and severance of the nervi corpori allati (NCA) indicated that the brain hormonally stimulates the CA (Scharrer, 1958; Wigglesworth, 1964; 1970). This was supported by the cytological demonstration of neurosecretory material in the CA and the correlated change in activity of CA(Highnam, 1967; Cassier, 1979). Further confirmation was obtained by destruction of specific groups of NSC in the brain. Cautery of the lateral neurosecretory cells in fourth ins tar nymphs of Locusta migratoria (Girardie, 1965) and the NSC of the pars intercerebralis in Rhodnius prolixus (Baehr, 1976) gave rise to precocious adults and adultoids respectively.
In our work with Tenebrio, illustrated in Fig. 3, we showed that different bands are present in different metamorphic stages. The same may be said for Cecropia (Fig. 4, center lanes). While there are many bands which are unique to a particular developmental stage, several larval and adult cuticular proteins share identical or nearly identical isoelectric points. This is consistent with the general similarities in amino acid composition of the components we have purified from the two stages (Tables 1 and 2).