Results 131 to 140 of about 4,193 (178)
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Vitellogenesis and Their Endocrine Control in Fishes
2021Due to the accumulation of yolk protein, the size of oocyte increased several times during oogenesis in teleosts; this process is known as vitellogenesis. Follicle undergoes final maturation by resumption of meiosis. Vitellogenin (Vtg) is a homodimeric phospholipoglycoprotein, the main precursor of yolk protein, which is synthesized in the liver under ...
Gyandeep Gupta +3 more
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Multihormonal Control of Vitellogenesis in Lower Vertebrates
2004The comparative approach on how and when vitellogenesis occurs in the diverse reproductive strategies displayed by aquatic and terrestrial lower vertebrates is presented in this chapter; moreover, attention has been paid to the multihormonal control of hepatic vitellogenin synthesis as it is related to seasonal changes and to vitellogenin use by ...
POLZONETTI, Alberta Maria +4 more
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1992
Malaria, dengue and other mosquito-borne infections are among the most devastating diseases (57, 144). The maintenance and dispersal of mosquito-borne disease depends upon the successful reproduction of the mosquito. The cornerstone of the reproductive cycle is vitellogenesis involving massive production of yolk protein precursors and their ...
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Malaria, dengue and other mosquito-borne infections are among the most devastating diseases (57, 144). The maintenance and dispersal of mosquito-borne disease depends upon the successful reproduction of the mosquito. The cornerstone of the reproductive cycle is vitellogenesis involving massive production of yolk protein precursors and their ...
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Cirriped vitellogenesis: Effect of ecdysterone in vitro
General and Comparative Endocrinology, 1977Abstract Ovarioles of Balanus amphitrite and B. eburneus were cultured with ecdysterone in medium (10−4–1 μg/ml). Yolk droplets of mature oocytes showed increasing degeneration with increasing concentration of ecdysterone. Other ovarian cells, cement gland cells, and mantle parenchyma were not affected to any extent. Although preliminary, the results
U E, Fyhn, H J, Fyhn, J D, Costlow
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Regulation of locust vitellogenesis
Trends in Biochemical Sciences, 1983The reproduction of insects is frequently synchronized to the availability of specific host plants or to seasonal climatic condi- tions. Synchronization is achieved in most cases either by migration to favourable habitats or by diapause, a genetically determined state of suppressed develop- mental and metabolic rates, frequently induced by photoperiod,
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Endocrinology of Vitellogenesis
1987The ovum (female germ cell) is truly the most remarkable of all animal cells: once activated, it can give rise to a complete new individual and it is the only cell, in higher animals, that is capable of doing so. The most distinguished feature of the ovum is its large size, which is required for the storage of reserves for the development of the embryo.
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Hormonal and Genetic Regulation of Vitellogenesis in Drosophila
The Quarterly Review of Biology, 1982Morphological, genetic, and hormonal studies of the process of vitellogenesis, whereby yolk is accumulated in the developing oocytes, have been going on for many years in Drosophila. Recently there has been a resurgence of interest in vitellogenesis, for it provides a model system for investigating how eukaryotic genes are regulated. The proteins found
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Oocyte Growth and Vitellogenesis
1988In the last few years, due to the advances made in biochemistry, electron microscopy, and cytochemistry, a functional approach to the solution of a number of problems regarding the biology of development has become possible. One of these problems is the development of the organization of the mature egg.
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