Zoology

The Physiology of Insecta. Volume I by Morris Rockstein

By Morris Rockstein

The body structure of Insecta, moment variation, quantity I, is a part of a multivolume treatise that brings jointly the recognized proof, the debatable fabric, and the various nonetheless unsolved and unsettled difficulties of insect body structure. because the first version of this multivolume treatise used to be released, there was a awesome growth of clinical activity in all of the quite a few features of insect body structure. the unique three-volume paintings has now grown to a completely revised six-volume treatise.
The current quantity comprises six chapters and starts with a dialogue of the biology of the Insecta. this can be via separate chapters at the constitution and foundation of the feminine reproductive method; the regulate of oogenesis, semen construction, sexual habit, and ovipostion; physiological and biochemical adjustments in the course of insect improvement; insect endocrinology; and getting older in bugs.

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Little of the labeled proteins enter into yolk spheres (Melius and Telfer, 1969). (2) The nurse cells or trophocytes deliver part of their cytoplasm, including proteins, to the oocyte (King and Aggarwal, 1965). (3) The follicle cells release a nondialyzable product, believed to be at least partly protein in nature (Anderson and Telfer, 1969), into the intercellular space between the follicle cells and the oocyte. This material seems to be necessary to enhance pinocytotic activity in the oolemma.

The central part is occupied by the cytoplasmic nutritive chamber or trophic core, into which the nuclei eventually release their contents. The oocyte remains connected to this trophic core by means of a cytoplasmic strand serving as a "feeding channel/' Alimentary egg formation is realized both by way of this "trophic strand" and by the follicle (Fig. 10). In Tenebrio and probably other Coleoptera Polyphaga, the situation is different. The trophic core is absent, nutritive cells being scattered throughout the germarium.

1972). d. Proteid Yolk Formation in Periplaneta americana (Panoistic Ovariole). Trophocytes being absent (Fig. 5), the possible sources of vitellogenic proteins are the oocyte, the follicle cells, and the hemolymph. A striking feature of the cytoplasm of all oocytes, regardless of their position within the ovariole, is the absence of an organized endoplasmic reticulum. Instead, the cytoplasmic matrix is filled with a host of free ribosomes. During active yolk deposition, the follicle cells are even highly specialized for protein synthesis as can be deduced from the very extensive endoplasmic reticulum and the numerous Golgi systems.

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