Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"11-ketotestosterone"”.
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Role of 11-ketotestosterone, testosterone, and prolactin in the expression of reproductive behaviors by male bluegill
… first experiment determined the association of 11-ketotestosterone (11KT) and testosterone (T), two important androgen hormones regulating reproduction in teleost fish, with reproduction in both types of male bluegill. The second study assessed the role of these androgens in the expression of …
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Effects of exogenous androgens on parental care behaviour in male bluegill sunfish (Lepomis macrochirus)
… care. I implanted males with testosterone, 11-ketotestosterone or flutamide, an androgen receptor blocker, and tested their nurturing behaviour and aggressiveness towards a brood predator. Males implanted with 11-ketotestosterone were 64% more aggressive and 71% less nurturing than controls. …
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INDUCED SPAWNING OF CAPTIVE TRIPLETAIL LOBOTES SURINAMENSIS
… improve these results.</p> <p>Plasma levels of 11-Ketotestosterone and Estradiol 17b were assayed in males and females during the spawning season using a competitive ELISA assay. Sex identification was most effective using 11-Ketotestosterone with a 1.19% error rate in cross validation of the …
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Reproduction in Male Salmonids with Special Reference to the Problems and Control of Maturation in Fish Culture
… naturally occurring androgens, testosterone and 11l-ketotestosterone, are examined. When administered to immature rainbow trout 11-ketotestosterone was more potent in inducing male secondary sexual characteristics, while testosterone exerted a greater depression of dry matter digestibility. …
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Fishing For The Evolutionary Bases Of Female Ornamentation
… variation in fish-specific androgen mechanisms, 11-ketotestosterone and its cognate receptor, suggesting that the female trait is not under the principal male-specific endocrine control. Investigating the genetic basis of throat coloration I find that that the same genomic regions are associated …
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The Role of 5-Alpha Reductase 3 In Steroid Metabolism
… progesterone, androstenedione, epitestosterone, 11-ketotestosterone, 11α-hydroxytestosterone, 11β-hydroxytestosterone, 6β-hydroxytestosterone, and cortisol) were added to transfected HEK293 cells. The dual 5-alpha reductase 1 and 2 inhibitor, dutasteride, was added to evaluate its inhibitory …
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Fundulus grandis Response to Exogenous LH Injection.
… levels peaked at 2 and 8 ug/gm BW doses, whereas 11-ketotestosterone showed a consistent response to the increasing dosage levels. These studies indicate a sensitivity of the Fundulus to the exogenous hormone treatment that is, at least for the female, contingent upon the time of day of injection …
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The Use of Liquid Chromatography Tandem Mass Spectrometry to Improve Newborn Screening for Congenital Adrenal Hyperplasia in New Zealand
… result was encountered. During the study, 11 CAH cases were detected, and the positive predictive value of screening improved from 1.1% to 48.7% after the introduction of LCMSMS. Analysis of retrospective cases was modelled to show that the sensitivity using the new protocol would improve …
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Behavioral and Hormonal Flexibility Across Light Environments in Guppies (Poecilia reticulata)
… and the androgen hormones testosterone and 11-ketotestosterone?; 5) Are there correlations between behavior and the stress hormone cortisol?; 6) Are there mean level changes in hormone release rates across light environments?; and 7) Is flexibility in hormone release rates influenced by …
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Sexual maturation in sea- and freshwater phases of Pacific salmonids and investigations of reproductive hormone involvement in osmoregulatory adaptation
… (GtH), estradiol-17β (E₂), testosterone (T), 11-ketotestosterone (11-KT), and 17α,20β-dihydroxyprogesterone (17,20-P). Blood sodium was measured by flame photometry. GSI and hydration level of oocytes increased in females of both species between the earliest stages of maturation and ovulation. …
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A test of the effects of androgens on immunity: no relationship between 11-keto testosterone and immune performance in bluegill sunfish (Lepomis macrochirus)
… (1) natural concentrations of the androgen 11-keto testosterone (11-KT) will be negatively related with immunity, and (2) an immunochallenge will lower 11-KT concentration. I found no evidence for a relationship between natural 11-KT concentration and measures of immunity (leukocyte counts, …
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The neural regulation of fatherhood, insights from the anemonfish amphiprion ocellaris
… higher levels of the circulating steroid hormone 11-ketotestosterone (11KT), which remains stable throughout the breeding cycle, indicating high androgens are not a hindrance to paternal effort. Females displayed higher circulating estradiol, which peaks 6 days after the eggs are laid, presumably …
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In vitro model of the fathead minnow hypothalamic-pituitary-gonadal axis for toxicological evaluation
… the liver over 28 days and PMSG would stimulate 11-ketotestosterone (11-KT) production in testes and E2 production in the ovaries, but all hormone production would likely decrease from day 0 of the culture to day 28. Additionally, tissues were exposed to three different concentrations of these …
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Dads matter: causes and consequences of plasticity in paternal care
… measured a personality trait (‘boldness’) and 11-ketotestosterone (11-kT, the major androgen in fishes) in individual males. In the control group, males became more bold over time. However, in the experimental group, boldness did not change. Further, 11-kT changed dramatically in the …