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Showing 1 to 20 of 21 for “"vitellogenesis"”.
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Ultrastructural and Biochemical Studies of Vitellogenesis in Drosophila Melanogaster and Hyalophora Cecropia
Made available in DSpace on 2015-05-14T14:57:08Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7121094.PDF: 6106226 bytes, checksum: edd3bcf3573a0b0fa99c35c1f8154074 (MD5) Previous issue date: 1971
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Neuroendocrine Mechanisms Involved in the Control of Ovarian Development and Vitellogenesis in the Rainbow Trout
… of the neuroendocrine mechanisms that control vitellogenesis and ovarian development in the female rainbow trout. Fluorometric, electrophoretic and chromatographic techniques and radioimmunoassay were used to determine serum levels of oestrone, oestradiol-17B, testosterone, vitellogenin and …
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Vitellogenesis in <i>Hyalomma dromedarii</i> (Acari: Ixodidae): A Model for Analysis of Endocrine Regulation in Ixodid Ticks
… from replete females. Similar stimulation of vitellogenesis with synganglion extracts was observed i<em>n vivo</em>. Although Juvenile hormone bis-epoxide and 20 hydroxyecdysone treatment did not affect vitellogenin synthesis in cultured fed virgin fat body, they did demonstrate stimulatory …
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The Reproductive Physiology Of Brook Charr (salvelinus Fontinalis, Mitchill) From Neutral And Acidic Lakes In Northern Ontario
… charr from neutral lakes initiated exogenous vitellogenesis in July. Charr from acidic lakes began exogenous vitellogenesis approximately one month later than neutral lake charr. Charr from acidic lakes had fewer yolky oocytes and more oil droplet oocytes than those from neutral lakes in July …
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Effects of exposure to 17α-ethynylestradiol during larval development on the African clawed frog (Xenopus laevis) and the wood frog (Rana sylvatica)
… including steroid signaling and metabolism, vitellogenesis, testicular development, and thyroid hormone signaling, both during the larval period and after the completion of metamorphosis. In general, compared to the control treatment, transcripts of genes involved in testicular development …
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The Reproductive Cycle of Sceloporus undulatus From Alabama Corresponding Plasma Steroid Levels and Comments on Reproductive Variation.
… later than the males and immediately began vitellogenesis. Older female fence lizards had at least 3 clutches per season. Eggs were oviposited in May, June, and July. Most yearlings had either 1 or 2 clutches per season. Alabama females were similar to other southern populations examined …
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Modeling the effects of endocrine disrupting chemicals on Atlantic croaker: understanding biomarkers and predicting population responses
… a physiologically based model that simulates vitellogenesis in a female fish. The model simulates the major biochemical reactions from the secretion of gonadotropin to the production of vitellogenin. I simulated the effects of three environmental stressors that affect vitellogenin production …
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Estrogen Receptor Regulation of Vitellogenin Gene Expression
… transcription, providing further evidence that vitellogenesis is a direct response to estradiol. A cytoplasmic estrogen binding protein distinct from the estrogen receptor is characterized. Possible functions of the cytoplasmic binding protein in the vitellogenic response are discussed.
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Elucidating the Function of Krüppel Homolog 1 (Kr-h1) Associated Proteins (KAPs) in Aedes aegypti Reproduction Through RNA Interference-Mediated Downregulation
… of Aedes aegypti mosquitoes, including previtellogenesis, vitellogenesis, and oogenesis. This study explores the interaction between Kr-h1 and its potential associated proteins (KAPs), with a specific focus on the dimerization partner (DP-1), and how this interaction regulates gene …
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An ultrastructural study of gametogenesis and early development in the sea anemone <i>Actinia fragecea</i> (Cnidaria : Anthozoa)
… but soon migrate into the mesogloea. During vitellogenesis, the oocytes accumulate compound yolk granuleso fibrillar and cortical granules, lipid droplets and glycogen. The surface of large oocytes bears tufts of large microvilli or cytospines. The oocytes reach some 150 pm in size. A group …
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OOGENESIS IN TUBULARIA LARYNX AND TUBULARIA INDIVISA (HYDROZOA, ATHECATA)
… and are considered oocytes. Toward the end of vitellogenesis, the oocytes fuse to form a single large oocyte with only one germinal vesicle surviving and completing meiosis. The remaining cells of each complex enlarge and produce yolk, but do not develop a germinal vesicle. These cells are true …
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Characterization of the Drosophila Egfl7/8 ortholog during oogenesis
… mid-oogenesis. Mid-oogenesis (stage8/9) is when vitellogenesis starts. At these stages the state of the egg chambers are checked in order to eliminate, through apoptosis of the germline, defective egg chambers. In starved flies, through activation of this “check-point”, oogenesis is blocked …
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Assessment of the Efficacy of a Constructed Wetland to Reduce or Remove Wastewater Effluent Estrogenicity and Toxicity Using Biomarkers in Male Fathead Minnows (Pimephales Promelas Rafinesque, 1820)
… after 2 and 3 weeks of exposure. The level of vitellogenesis induced by effluent exposure was high compared to similar studies. A spring season evaluation followed. Biomarkers in P. promelas were used to assess the efficacy of a treatment wetland to remove toxicity and estrogenicity in final …
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Assessing species-specific reproductive variation to inform assisted reproductive technologies for Canadian snakes
… that FPM would increase in May and June during vitellogenesis, be expressed in the highest concentrations annually from May to August and remain at high concentration through to parturition in gravid females. I found annual variation in FTM and FPM, but not in the patterns which I had predicted. …
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Endocrine control of fat body composition and effects of the insect growth regulators methoprene and pyriproxyfen on the development and reproduction of the Argentinian cockroach, Blaptica dubia Serville (Blattaria: Blaberidae)
… The JH III titer shows significant peaks during vitellogenesis and ovarian growth, and towards the end of the period of gestation. Changes in the concentration of free ecdysteroids in the haemolymph were less clear. Treatment of adult females with the juvenile hormone analogue methoprene during …
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Maternal Plasma and Corresponding Egg Yolk Hormone Variation within a Clutch and Across the Nesting Season of the Loggerhead Sea Turtle (Caretta Caretta)
… (E2) and testosterone (T) are associated with vitellogenesis while progesterone (P) is associated with follicular ovulation. Therefore, E2 and T were hypothesized to increase with progressive season and nesting event while (P) was expected to remain constant. Radioimmunoassays (RIA) were used …
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Life history and physiological ecology of the lizard, Cordylus Giganteus
… in both sexes. Females may reproduce biennially. Vitellogenesis commenced in autumn (March), and continued through hibernation with ovulation in spring (October). Two or three young are born in autumn. A functional placenta is implicated. Seasonal steroid hormone profiles are presented. Males …
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Neuropeptide hormones from the eyestalks of Jasus Lalandii
… as well as with antisera raised against vitellogenesis-inhibiting hormone (VIH) of the H. americanus and moult-inhibiting hormone (MIH) of C. pagurus. This is the first time that the immunolocalisation of these 3 hormones have been studied in a single crustacean species. The chief results …
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Hormonal regulation and environmental influences in the reproduction of the butterfly Bicyclus anynana
… egg maturation starts after eclosion, and thus vitellogenesis and choriogenesis seem to depend exclusively on juvenile hormones (JH). Using a JH mimic (pyriproxyfen) and an antagonist of JH biosynthesis (MK-801), reproduction in B. anynana could be successfully manipulated towards either a …
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La riproduzione dei condroitti come elemento chiave per la loro conservazione e gestione nel Mediterraneo centro-occidentale
… cycle that consists of two different periods (vitellogenesis and gestation) with a quite extensive gestation ranging from 1.5 to about three years. It is evident that the capture of these species, in particular females, especially during the breeding period, would lead to a slow decline of …
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