Advances in Insect Physiology, Vol. 19 by P. D. Evans, V. B. Wigglesworth

By P. D. Evans, V. B. Wigglesworth

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Additional info for Advances in Insect Physiology, Vol. 19

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Also by analogy this precursor may contain other, as yet undiscovered, neuropeptides. An analysis of proctolin biosynthesis MODEL NEUROPEPTIDE 25 may therefore contribute directly to a major general need in insect neurobiology, namely the characterization of new neuropeptides and an expansion of the number of sequenced transmitters and hormones. The analysis of proctolin biosynthesis is likely to depend on the application of molecular biological techniques rather than conventional biochemical methods.

15,173-196. Sullivan, R. E. and Newcomb, R. W. (1982). Structure function analysis of an arthropod peptide hormone: proctolin and synthetic analogues compared on the cockroach hindgut receptor. Peptides 3,337-344. , Schiebe, M. andVoigt, K. H. (1984). Synaptic and non-synaptic effects of molluscan cardioexcitatory neuropeptides on locust skeletal muscle. Neurosc. Lett. 45,99-104. Watson, W. , Augustine, G. , Benson, J. A. and Sullivan, R. E. (1983). Proctolin and an endogenous proctolin-like peptide enhance the contractility of the Limulus heart.

The modifications in the JH titre due to the mode of development of the insect and to its spermatogenesis are not the only factors involved in apyrene and eupyrene differentiation. The occurrence of an apyrenespermatogenesis-inducing factor was shown to be necessary in nondiapausing Laspeyresia for the commitment of the bipotential spermatocytes to apyrene differentiation. Ecdysterone still also plays a part in the renewal of spermatogenesis in post-diapausing larvae, triggering eupyrene differentiation but exerting no stimulatory effects on apyrene spermatogenesis (Friedlander and Benz, 1982).

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