By Dr. K. Sláma, Ing. Dr. M. Romaňuk, Prof. Ing. Dr. F. à orm (auth.)

ISBN-10: 3709183316

ISBN-13: 9783709183311

ISBN-10: 3709183332

ISBN-13: 9783709183335

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The plasma membranes were folded and the cell membranes interdigitated. Between the cells intercellular spaces were observed and the cells appeared to communicate by thin processes [278]. In some other insects these intercellular spaces were absent [231]. The acellular stromal sheath on the surface of the gland was similar to that observed on other glandular organs [278]. In most insect species the cells of the CA have well developed agranular or smooth surfaced endoplasmic reticulum [85, 150, 152, 159, 160, 225, 278].

The length of the instar in which CAR was supplied was proportional to that of previous larval-larval instars, but generally shorter than the larval-adult instar. The epidermis of extra-larvae produced by CA implantations may be completely larval in most species. However, some epidermal structures such as wing lobes had sometimes partially metamorphosed into adult wings. In order to be affected these structures require the presence of CAR very early after or even before the last larval ecdysis.

The effects of CAH on adult diapause have been reviewed by DE WILDE [383, 384]. Stimulation of ovarian development in Rhodnius by CAR was discovered by WIGGLESWORTH [366]. Extensive studies on Oncopeltus [140], Dytiscus [143], Melanoplus [236], Leucophaea [277], Calliphora [340] and on many other unrelated species or groups of insects [70] confirmed rather common occurrence of the gonadotropic effects of CAR. In the Aotion of CAR on Reproduotion and Adult Diapause 37 young larval instars the gonads are not oompletely differentiated and the effeot of CAR on this immature tissue is similar to that on other larval tissues.

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Insect Hormones and Bioanalogues by Dr. K. Sláma, Ing. Dr. M. Romaňuk, Prof. Ing. Dr. F. à orm (auth.)

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