Results 131 to 140 of about 4,036 (162)
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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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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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Active vitellogenesis in precocene-treated Locusta migratoria
General and Comparative Endocrinology, 1981Abstract Vitellogenesis continues unhindered during the first 2 days after precocene II treatment of vitellogenic female locusts bearing terminal oocytes up to 4 mm in length. The growth rate of these oocytes remains normal, but the corpora allata of treated females are inactive insofar as juvenile hormone synthesis is concerned.
E, Lubzens, P, Moshitzky, S W, Applebaum
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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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Regulation of vitellogenesis in Drosophila
International Journal of Insect Morphology and Embryology, 1993Abstract During vitellogenesis the 3 major yolk proteins of Drosophila are synthesized and transported from the tissues which produce them to the oocyte. Here they are endocytosed by the oocyte and stored in yolk granules for utilization during embryogenesis.
Mary Bownes +3 more
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A specific radioimmunoassay for vitellogenesis in mosquitoes
Journal of Insect Physiology, 1977Abstract Hagedorn's assay for vitellogenesis, in which a crude antigen-antibody complex is collected directly on a Millipore membrane, without prior separation of soluble from insoluble proteins, is unspecific. This was proven as follows. Fat bodies of blood-fed mosquitoes ( Aedes aegypti ) were incubated in a medium containing 3 H valine.
D, Borovsky, E, van Handel
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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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Oogenesis in Fundulus heteroclitus. III. Vitellogenesis
Journal of Experimental Zoology, 1983AbstractSeveral physiological parameters associated with oocyte growth (vitellogenesis) in the killifish, Fundulus heteroclitus, are defined. Hepatocytes from females and estrogen‐treated males are highly synthetic cells, whereas those from males are relatively quiescent.
K, Selman, R A, Wallace
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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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