VITELLOGENESIS IN A PRIMITIVE TERMITE,ZOOTERMOPSIS ANGUSTICOLLIS(HAGEN) (HODOTERMITIDAE)
نویسندگان
چکیده
منابع مشابه
Ultrastructural Observations of Vitellogenesis in the Spider
Ovaries from the spider crab, Libinia emarginata L. were studied to learn more of vitellogenesis in crustaceans. Oogonia and previtellogenic oocytes were found in the core of the ovaries. Vitellogenic oocytes are located more peripherally. Profiles of the endoplasmic reticulum are abundant in the vitellogenic oocytes. The granular and agranular reticulum as well as the Golgi complex are active ...
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The electrophoretic analysis of egg yolk proteins of the mollusc Octopus vulgaris by both SDSand nativePAGE, showed two different patterns that mirror the two main periods characterizing the reproductive cycle of the female of Octopus vulgaris: the non-vitellogenic period (October-February) and the vitellogenic period (March-July). Since different levels of progesterone also characterize these ...
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The ovary of the roach Periplaneta americana has been studied by techniques of light and electron microscopy. Each ovariole (panoistic type) contains a linear array of oocytes in varying stages of development. Newly formed oocytes become encased by a layer of follicle cells and begin pinocytosis. All subsequent growth stages of the oocytes are dependent, in part, on this phenomenon. All of the ...
متن کاملCrustacean Vitellogenesis: Its Role in Oocyte Development1
SYNOPSIS. One of the major changes that occurs during the maturation of oocytes is the accumulation of yolk protein, or vitellin (Vn). To better understand how this process is regulated, we characterized the Vn of the ridgeback shrimp, Sicyonia ingentis (Penaeoidea). This Vn is a 322 kDa molecule composed of three subunits. Using purified Vn, we developed an anti-Vn antiserum and used it to cha...
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In most insects, vitellogenesis is regulated by juvenile hormone (JH). The recent cloning of the vitellogenin gene in a number of JH-dependent species has allowed the study of the induction of vitellogenin production by JH at a molecular scale. Potential JH response elements have been described in the regulatory regions of vitellogenin and other JHinducible genes. These elements may not only sh...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1978
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1540956