By Govindan Bhaskaran
Stanley Friedman collage of Illinois Urbana, Illinois A perusal of the desk of contents of this brief symposium on Insect Endocrinology may well lead people who find themselves ordinarily unin structed in Fraenkel's actions to ask yourself as to our selection of papers. Our justification is predicated upon our attempt to pay attention the symposium upon a unmarried zone during which he has had a longer involvement: particularly, the metamorphic molt in flies. In so doing, we instantly famous the big humoral and physiological ramifications, either direct and oblique, of such an curiosity. Our collection of those papers is an try and current the vast photo with a couple of quickly strokes. the 1st delivering, by means of 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 adjustments at pupariation (Fraenkel and Rudall, 1940, Proc. Roy. Soc. London ( ) 129:1; 1947, ibid, 134:111), supplied quanti tative information that have, in view that that point, motivated our rules con cerning cuticular alterations 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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Additional info for Current Topics in Insect Endocrinology and Nutrition: A Tribute to Gottfried S. Fraenkel
Another biological marker, found exclusively in the corpus allatum and described earlier as C-body material (Scharrer, 1971), is especially prominent in the stromal compartment of very old gonadectomized females. The exit of this strikingly structured, Golgi-derived product from the gland can be visualized particularly clearly in members of this group. Accumulations of the material have been caught within and partially outside of the acellular sheath of the gland, presumably at the moment of their release into the hemolymph.
5 1l£ FIFTH INSTM Growth of fifth instar M. sexta larvae. 00 hr) at which time they were weighed and fed regular diet. Larvae were weighed at the same hour on the following days until all larvae entered the wandering stage. A large majority (80%) of the larvae excreted frosted frass (FF) on day 3, exposed the dorsal vessel (EDV) on day 4 and became 'wandering larvae' . Such larvae either died before feeding or fed poorly and died within a day or two. Therefore, in all experiments except those specifically noted, starved larvae were starved for three days before feeding.
His publication with Rudall in 1940 alerted the scientific community to the fact that about 40% of the dry weight of fly larval cuticle is protein, much of which is soluble in boiling water. They also discovered that less than 10% of the dry weight remained soluble in boiling water after the puparium was tanned, but that protein could still be extracted with 5% KOH, leaving the chitin behind. In 1947, Fraenkel and Rudall introduced the term "arthropodin" to refer to readily extractable cuticular protein.