Search Results - "Cummins, J T"

Specific, sensitive, and rapid assay for human immunodeficiency virus type 1 pol mutations associated with resistance to zidovudine and didanosine by FRENKEL, L. M, WAGNER, L. E, ATWOOD, S. M, CUMMINS, T. J, DEWHURST, S

“…Article Usage Stats Services JCM Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley…”
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Steroid feedback inhibition of pulsatile secretion of gonadotropin-releasing hormone in the ewe by KARSCH, F. J, CUMMINS, J. T, THOMAS, G. B, CLARKE, I. J

“…The long-term negative feedback effects of sustained elevations in circulating estradiol and progesterone on the pulsatile secretion of gonadotropin-releasing…”
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Increased gonadotropin-releasing hormone pulse frequency associated with estrogen-induced luteinizing hormone surges in ovariectomized ewes by Clarke, I J, Cummins, J T

“…Hypophyseal portal blood samples were taken from ovariectomized (OVX) ewes given 50 micrograms estradiol benzoate. This estrogen treatment elicited a biphasic…”
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The negative feedback effects of testicular steroids are predominantly at the hypothalamus in the ram by Tilbrook, A J, de Kretser, D M, Cummins, J T, Clarke, I J

“…This study aimed to delineate the hypothalamic and/or pituitary actions of testosterone and its primary metabolites 5 alpha-dihydrotestosterone and estradiol…”
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GnRH secretion throughout the ovine estrous cycle by Clarke, I J, Thomas, G B, Yao, B, Cummins, J T

“…In order to define the patterns of gonadotropin-releasing hormone (GnRH) secretion during the estrous cycle of the sheep we sampled hypophysial portal blood…”
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Effect of restricted feeding on the concentrations of growth hormone (GH), gonadotropins, and prolactin (PRL) in plasma, and on the amounts of messenger ribonucleic acid for GH, gonadotropin subunits, and PRL in the pituitary glands of adult ovariectomized ewes by Thomas, G B, Mercer, J E, Karalis, T, Rao, A, Cummins, J T, Clarke, I J

“…The effects of long term restricted feeding on the synthesis, storage, and release of GH, LH, FSH, and PRL were examined in adult ovariectomized ewes. Two…”
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Direct pituitary effects of estrogen and progesterone on gonadotropin secretion in the ovariectomized ewe by Clarke, I J, Cummins, J T

“…The direct pituitary effects of estrogen and progesterone on the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) were studied in…”
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Circulating half-lives of follicle-stimulating hormone and luteinizing hormone in pituitary extracts and isoform fractions of ovariectomized and intact ewes by Robertson, D M, Foulds, L M, Fry, R C, Cummins, J T, Clarke, I

“…Previous studies have shown that the circulating half-life (t 1/2) of serum FSH in ewes after hypophysectomy (HPX) increased 10-fold after ovariectomy (OVEX)…”
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GnRH pulse frequency determines LH pulse amplitude by altering the amount of releasable LH in the pituitary glands of ewes by Clarke, I J, Cummins, J T

“…We have measured the size of the releasable pools of LH and FSH in the pituitary glands of ovariectomized ewes in which the pituitary was isolated surgically…”
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Pituitary receptors for gonadotropin-releasing hormone in relation to changes in pituitary and plasma gonadotropins in ovariectomized hypothalamo/pituitary-disconnected ewes. II. A marked rise in receptor number during the acute feedback effects of estradiol by CLARKE, I. J, CUMMINS, J. T, CROWDER, M. E, NETT, T. M

“…Ovariectomized (OVX), hypothalamo/pituitary-disconnected (HPD) ewes were used to ascertain the short-term effects of estradiol on the number of…”
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The effect of chronic ethanol on glutamate binding in human and rat brain by Cummins, J T, Sack, M, von Hungen, K

“…Quantitative autoradiographic techniques demonstrate that chronic alcohol administration causes a decrease in [3H]-glutamate binding to hippocampal…”
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GnRH-associated peptide (GAP) is cosecreted with GnRH into the hypophyseal portal blood of ovariectomized sheep by Clarke, I J, Cummins, J T, Karsch, F J, Seeburg, P H, Nikolics, K

“…The secretion of gonadotropin-releasing hormone (GnRH) and GnRH-associated peptide (GAP) into sheep hypothalamo-hypophyseal portal blood was investigated in…”
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Naloxone evokes large-amplitude GnRH pulses in luteal-phase ewes by Horton, R J, Cummins, J T, Clarke, I J

“…Ewes were sampled during the mid-late luteal phase of the oestrous cycle. Hypophysial portal and jugular venous blood samples were collected at 5-10 min…”
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The significance of small pulses of gonadotrophin-releasing hormone by Clarke, I J, Cummins, J T

“…A series of experiments was conducted to ascertain the significance of 'small' pulses of gonadotrophin-releasing hormone (GnRH). In the first experiment,…”
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The oestrogen-induced surge of LH requires a 'signal' pattern of gonadotrophin-releasing hormone input to the pituitary gland in the ewe by Clarke, I J, Cummins, J T, Jenkin, M, Phillips, D J

“…Two experiments were conducted with ovariectomized and hypothalamo-pituitary disconnected (HPD) ewes to ascertain the pattern of inputs, to the pituitary…”
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Direct pituitary inhibition of prolactin secretion by dopamine and noradrenaline in sheep by Thomas, G B, Cummins, J T, Doughton, B W, Griffin, N, Smythe, G A, Gleeson, R M, Clarke, I J

“…The effects of dopamine, noradrenaline and 3,4-dihydroxyphenylacetic acid (DOPAC) on the release of prolactin were examined in ovariectomized ewes. Infusion of…”
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Induction of ovulation in chronically hypophysectomized Booroola ewes by Fry, R C, Clarke, I J, Cummins, J T, Bindon, B M, Piper, L R, Cahill, L P

“…Booroola Merino ewes, with (F+; N = 17) and without (++; N = 13) a copy of the fecundity gene were hypophysectomized and 6 weeks later were given an i.m…”
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Concentrations of dopamine and noradrenaline in hypophysial portal blood in the sheep and the rat by Thomas, G B, Cummins, J T, Smythe, G A, Gleeson, R M, Dow, R C, Fink, G, Clarke, I J

“…The concentrations of dopamine, noradrenaline and their respective primary neuronal metabolites 3,4-dihydroxyphenylacetic acid (DOPAC) and…”
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The half-life of follicle-stimulating hormone in ovary-intact and ovariectomized Booroola and control Merino ewes by Fry, R C, Cahill, L P, Cummins, J T, Bindon, B M, Piper, L R, Clarke, I J

“…To determine whether the high ovulation rate of the Booroola Merino ewe could be explained by FSH metabolism we have tested the proposition that FSH may have a…”
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Effects of ovine follicular fluid on plasma LH and FSH secretion in ovariectomized ewes to indicate the site of action of inhibin by Clarke, I J, Findlay, J K, Cummins, J T, Ewens, W J

“…Ovariectomized ewes were given 2 ml s.c. injections of ovine follicular fluid (oFF) (N = 3) or serum (N = 3) and blood samples were collected each day for 3…”
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