Download The Physiology of Insecta. Volume I by Morris Rockstein PDF

By Morris Rockstein

The body structure of Insecta, moment version, quantity I, is a part of a multivolume treatise that brings jointly the identified proof, the debatable fabric, and the numerous nonetheless unsolved and unsettled difficulties of insect body structure. because the first version of this multivolume treatise used to be released, there was a impressive enlargement of medical undertaking in all of the numerous elements 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 off with a dialogue of the biology of the Insecta. this is often by means of separate chapters at the constitution and starting place of the feminine reproductive approach; the keep watch over of oogenesis, semen creation, sexual habit, and ovipostion; physiological and biochemical alterations in the course of insect improvement; insect endocrinology; and getting older in bugs.

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3. The Occurrence of DNA in the Ooplasm The presence of DNA in the cytoplasm of the oocyte has been reported in several insects. In Acanthocephala and Oncopeltus, nuclei and Feulgen-positive droplets enter the trophic core where they become Feulgen-negative, only to become positive again after being transported to the oocyte (Bonhag, 1955a). However, by means of autoradiography and ligation of the trophic core, Zinsmeister and Davenport (1971) demonstrated that neither DNA nor protein enter the oocyte from external sources in Oncopeltus.

Imaginai males and females are formed but apparently do not take part in reproduction (Scott, 1936, 1938; Pringle, 1938). c. Strepsiptera. In this parasitic order, the sexually mature female is neotenic and remains located inside the abdomen of its host. Two or three ovarial strands are found on each side of the intestine. Oviducts are absent, ovulation taking place into the hemocoel (Hughes-Schr├Ąder, 1924). d. Diptera. In the family Cecidomyidae, species of the genera Miastor, Oligarces, and T any tarsus have paedogenetic larvae although functional adults of both sexes may also be produced.

During this stage of vitellogenesis, the follicle cells play a role in the selective absorption of vitellogenic blood proteins by the oocyte (Fig. 12). After vitellogenesis is complete, Fig. IB. Epithelial plug and corpus luteum in the ovarial stalk of Tenebrio Schlottmann and Bonhag, 1956). (after 26 JAN DE WILDE AND ARNOLD DE LOOF the follicle cells secrete the vitelline membrane (in most insects, see p. 42) and the chorion, which in many cases may show impressions of follicle folds and villi.

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