Results 161 to 170 of about 6,694 (212)
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1985
Fertilized eggs are the crossroads of development. They represent both the origin and the biological goal of each individual organism. Eggs provide in two ways for the embryo they enclose: They contain developmental instructions given by the mother to direct the initial phases of embryogenesis (see Chapters 11–13), and they are usually provisioned with
POSTLETHWAIT JH, GIORGI, FRANCO
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Fertilized eggs are the crossroads of development. They represent both the origin and the biological goal of each individual organism. Eggs provide in two ways for the embryo they enclose: They contain developmental instructions given by the mother to direct the initial phases of embryogenesis (see Chapters 11–13), and they are usually provisioned with
POSTLETHWAIT JH, GIORGI, FRANCO
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Regulation of vitellogenesis in Drosophila
Arthropod Structure and Development, 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
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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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1987
In vertebrates, there are three principal modes of nutrition for developing embryos: (1) the laying down of food stores, synthesized in the liver, in the oocyte (vitellogenesis) (this is the most common mode in nonmammalian species); (2) the direct provision of nutrients to the developing young through the intermediary of the uterine wall by either ...
Ian P. Callard, S.-m. Ho
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In vertebrates, there are three principal modes of nutrition for developing embryos: (1) the laying down of food stores, synthesized in the liver, in the oocyte (vitellogenesis) (this is the most common mode in nonmammalian species); (2) the direct provision of nutrients to the developing young through the intermediary of the uterine wall by either ...
Ian P. Callard, S.-m. Ho
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Vitellogenesis and the Vitellogenin Gene Family
Science, 1981Vitellogenin is synthesized under estrogen control in the liver, extensively modified, transported to the ovary, and there processed to the yolk proteins lipovitellin and phosvitin. In the frog Xenopus laevis there are at least four distinct but related vitellogenin genes.
W, Wahli +3 more
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Vitellogenesis in two spathebothriidean cestodes
Parasitology Research, 2005Vitellogenesis in two spathebothriidean tapeworms, dixenous adult Cyathocephalus truncatus and monoxenous progenetic Diplocotyle olrikii, has been examined using transmission electron microscopy and cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate for glycogen.
M. Brunanska +2 more
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2003
In the Japanese eel Anguilla japonica, oocyte development has not been observed to occur under ordinary rearing conditions. Therefore, hormonal treatment is necessary to induce ovarian maturation artificially. Weekly injections of aqueous extract of salmon pituitaries were generally conducted for inducing vitellogenesis (Yamauchi and Yamamoto 1982). 17,
Narumi Sato +3 more
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In the Japanese eel Anguilla japonica, oocyte development has not been observed to occur under ordinary rearing conditions. Therefore, hormonal treatment is necessary to induce ovarian maturation artificially. Weekly injections of aqueous extract of salmon pituitaries were generally conducted for inducing vitellogenesis (Yamauchi and Yamamoto 1982). 17,
Narumi Sato +3 more
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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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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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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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