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Showing 1 to 20 of 113 for “"gonads"”.
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The influence of the Gonads on Protein Metabolism
It has long been known that the gonads exercise an important effect on the individual, nut only in recent years has it been recognized how intricate and vast this effect can be. From the earliest of times it was common knowledge that gonadectomy in either males or females resulted in sterility. …
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The role of retinoic acid in germ cell development in embryonic mouse gonads
Germ cells are the only cell type to undergo meiosis, a specialized cell division process necessary for the formation of haploid gametes. Timing of this process is sex-specific. Ovarian germ cells initiate meiosis during embryonic development, while testicular germ cells initiate meiosis after …
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An Experimental Study of the Role of the Gonads in the Annual Stimulus for Bird Migration
Made available in DSpace on 2014-12-04T22:45:58Z (GMT). No. of bitstreams: 1 0016437.pdf: 5601514 bytes, checksum: a27647e17dd1f310f1956b450137ea9f (MD5) Previous issue date: 1956
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The effect of photoperiod on the gonads and basophilic adenohypophyseal cells of the rough-skinned newt, Taricha granulosa granulosa
… paper is to study the effect of light on the gonads and the gonadotropic hormone forming cells of the adenohypophysis in the newt Taricha granulosa granulosa.
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Identifying the mechanism critical for proliferation, apoptosis, and cell-cell interaction in the development of mouse adrenals and gonads
Adrenal, testis, and ovary are steroidogenic organs derived from a common primordium that consists of Steroidogenic factor 1 (SF1)-positive precursor cells. SF1 not only defines the steroidogenic lineages in these organs, but also controls their differentiation. In this thesis project, I used …
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Sexual differentiation of somatic and germ cell lineages of the mouse gonad
… expression occurs in the central region of XY gonads and subsequently spreads to the anterior and posterior poles. In XX gonads I found that one ovarian gene, follistatin, is also expressed in a center-to-pole pattern, whereas a second ovarian gene, Adamtsl9, is expressed in an …
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Ciclo reprodutivo de Echinaster (Othilia) brasiliensis Müller & Troschel, 1842 (Echinodermata: Asteroidea) na região do Cabo Frio, RJ
… using gonad index and histological analysis of gonads. E. (O.) brasiliensis exhibited a continuous reproduction. Histological analysis of gonads showed asynchrony in gametogenesis among the individuals of this population. Small and mesovitellogenic oocytes (60-160μm) were the dominant size-class …
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Observations on the reproductive morphology of some California spionid polychaetes
… the sperm, nephridia, seminal receptacles, and gonads among a number of California spionid species. The data collected provide support for the general observation of other workers.
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Studies on Bucephalid cercaria including a new species from the Dillon Beach area
… just anterior to the posterior extremity; gonads posterior and vitellaria species live in the gut of marine and fresh-water fishes. The metacercariae are found encysted beneath the skin or in the nervous system of other fishes serving as second intermediate hosts. Sporocysts and cercariae …
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Biomarkers (lipids, fatty acids and stable isotopes) to examine diet of the sea urchin Evechinus chloroticus.
… and fatty acid composition of E. chloroticus gonads collected from three locations within the Hauraki Gulf revealed a digestive pathway from the brown seaweed, especially E. radiata, to gut contents, gut and gonads, confirming the storage role for nutrients played by gonads in sea urchins. …
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Estratégia reprodutiva e gametogênese de Cassidulus mitis Krau, 1954 (Echinodermata: Echinoidea)
… individuals (DP= 108.25; SE= l6.32). Anterior gonads are commonly smaller than posterior ones. Differences in gametogenic stages were found between anterior and posterior gonads. First sexual maturity occurs in individuals larger than 17 mm. Intestine wet weight is about two or three fold …
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Studies on the gonadotrophic hormones of pituitary and placental origin
… found that atrophic changes took place in the gonads of dogs after hypophysectomy, Later, in 1924, Evans and hie colleagues reported that in normal rats treated with pituitary extracts enlargement of the ovaries and formation of large numbers of corpora lutea occurred. A few years later Smith …
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The role of the Fused toes locus containing Iroquois homeobox gene 3, 5, and 6 and Ftm, Fto, and Fts during ovary and testis development in mice
… sex determination and differentiation in mouse gonads. Irx3 and Irx5, which are the homeobox genes, and Ftm and Fts are highly expressed in ovaries from the stage of early gonad development. However, Ftm shows a dramatic increase in adult testes. This dimorphic expression pattern gave us the …
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Beta-Catenin and Development of the Urogenital System
The urogenital system is composed of the kidneys, gonads, urinary and reproductive tracts. Components of the urogenital system play many important roles in the body; kidneys function by regulating the body's fluid volume, acidity and mineral composition, while the reproductive tract is necessary …
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Untersuchungen zur Wirkung von östrogenwirksamen Stoffen auf die Gonadenentwicklung bei Fröschen (Rana temporaria und Xenopus laevis) sowie ultrastrukturelle und immunhistochemische Untersuchungen an Froschgonaden (Rana temporaria)
… and immunohistochemical investiga-tions on the gonads of frogs (Rana temporaria). The aim of the present thesis was the investigation and assessment of the estrogen pollu-tion of a river in South-Germany above and below a sewage plant outlet and its possible effects on the gonadal development in …
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Biochemical and cell biological studies of cytoplasmic incompatibility in Drosophila
… of a Rickettsia-like endosymbiont inhabiting the gonads of infected animals. Though originally discovered in mosquitoes, CI has now been observed in a diverse array of insects including mosquitoes (Aedes group), beetles (Tribolium confusum), moths (Ephestia cautella), wasps (Nasonia vitripennis), …
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Life history study of red stumpnose (Chrysoblephus gibbiceps), a South African endemic seabream
… dissected and morphological measurements taken. Gonads, stomachs and otoliths were removed from 237 individuals and presented. Otoliths were sectioned and independently aged by three readers, age agreement was reached on 183 fish.
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