abstract：:The effect of salmon calcitonin (0.25 MRC mU/g body wt) was investigated on the serum calcium and inorganic phosphate levels of the frog. Rana tigrina. The hormone evokes hypocalcemia (on Day 1 and Day 3) which is followed by a significant hypercalcemia on Day 10. Thereafter, the level of calcium decreases again on Da...

journal_title：General and comparative endocrinology

authors： Srivastav AK,Rani L

更新日期：1989-04-01 00:00:00

abstract：:The isolation of a maturational gonadotropin from pituitaries of Atlantic croaker (Micropogonias undulatus), a marine teleost belonging to the order perciformes, is described. A radioimmunoassay has been developed for the measurement of this hormone in blood samples and validation of the assay is presented. The hormon...

journal_title：General and comparative endocrinology

authors： Copeland PA,Thomas P

更新日期：1989-03-01 00:00:00

abstract：:The response of plasma prolactin (PRL) to manipulations of plasma calcium were investigated in coho salmon. Injection of 3.16 mumol EGTA/10 g body weight (to reduce the plasma calcium activity) resulted in significantly higher plasma PRL levels. Lower doses of EGTA (1.06 and 2.13 mumol/10 g body wt) had no effect on p...

journal_title：General and comparative endocrinology

authors： Fargher RC,McKeown BA

更新日期：1989-03-01 00:00:00

abstract：:Since an extrapancreatic source of insulin has been postulated in the chick embryo, insulin was sought by immunohistochemistry in the embryo before and after development of the pancreas and other tissues. Using for the first time an antiserum specific for chicken insulin, localization of insulin was investigated in wh...

journal_title：General and comparative endocrinology

authors： Bagnell CA,Baker NK,McMurtry JP

更新日期：1989-02-01 00:00:00

abstract：:Growth hormones (GHs) and prolactins (Prls) purified from representatives of each vertebrate class from bony fish onwards were tested for their ability to stimulate in vivo peripheral deiodination of labeled thyroxine (T4*) into triiodo-L-thyronine (T3*) in the eel. Plasma T3*/T4* ratio was used as parameter. All GHs ...

journal_title：General and comparative endocrinology

authors： de Luze A,Leloup J,Papkoff H,Kikuyama S,Kawauchi H

更新日期：1989-02-01 00:00:00

abstract：:The investigation of calcitonin-like immunoreactivity performed in whole extracts of the terrestrial crustacean Orchestia cavimana using radioimmunoassay revealed large amounts of these peptides varying in concentration according to the stages of the molt cycle. Their level is maximum at the time of the exuviation. Th...

journal_title：General and comparative endocrinology

authors： Graf F,Fouchereau-Peron M,Van-Wormhoudt A,Meyran JC

更新日期：1989-01-01 00:00:00

abstract：:The presence of binding sites for nonecdysteroid steroids was investigated in the cytosol of several tissues of the migratory locust, Locusta migratoria migratorioides. Binding of androgens was not observed. Most tissues, however, showed nonsaturable binding of estrogens and in some tissues saturable progestin binding...

journal_title：General and comparative endocrinology

authors： Paesen G,Novak F,Swevers L,De Clerck D,De Loof A

更新日期：1988-12-01 00:00:00

abstract：:Due to its unique organization, the teleost pituitary is an ideal model in which to investigate the relationship of the nervous system with the pituitary endocrine cells. A light microscope immunocytochemical study of the sea bass pituitary revealed six different neuropeptides in nerve fibers which projected into the ...

journal_title：General and comparative endocrinology

authors： Moons L,Cambré M,Marivoet S,Batten TF,Vanderhaeghen JJ,Ollevier F,Vandesande F

更新日期：1988-11-01 00:00:00

abstract：:Cholecystokinin (CCK) radioimmunoassay and immunocytochemistry were used to localize the expression of CCK-like peptides in the gut, brain, and skin of Xenopus laevis during development from fertilization through metamorphosis to the adult form. CCK-like peptides were first detected in the gut shortly before food was ...

journal_title：General and comparative endocrinology

authors： Scalise FW,Vigna SR

更新日期：1988-11-01 00:00:00

abstract：:Calcitonin gene-related peptide (CGRP) was found using radioimmunoassay in the brain and spinal cord of the bullfrog, Rana catesbeiana. The brain extracts were found to contain 241.7 +/- 68.1 pg/mg tissue, and the spinal cord contained 1753.0 +/- 96.8 pg/mg tissue. An intense immunocytochemical reaction was observed i...

journal_title：General and comparative endocrinology

authors： Kline LW,Kaneko T,Chiu KW,Harvey S,Pang PK

更新日期：1988-10-01 00:00:00

abstract：:The presence of specific, saturable, high-affinity gonadotropin receptors was demonstrated in membrane preparations from preovulatory ovarian follicles of amago salmon (Oncorhynchus rhodurus), including intact follicles, isolated thecal layers, and isolated granulosa cells. Optimum conditions for the binding study usi...

journal_title：General and comparative endocrinology

authors： Kanamori A,Nagahama Y

更新日期：1988-10-01 00:00:00

abstract：:The neurohypophyseal hormones of the hippopotamus (Hippopotamus amphibius) and collared peccary (Tayassu angulatus) were isolated by molecular sieving and preparative high-pressure liquid chromatography (HPLC). Oxytocin and arginine vasopressin have been identified by their amino acid compositions and their retention ...

journal_title：General and comparative endocrinology

authors： Rouille Y,Chauvet MT,Chauvet J,Acher R,Hadley ME

更新日期：1988-09-01 00:00:00

abstract：:The endocrine pancreas of the lizard Podarcis hispanica is described using light and electron microscopy. The endocrine pancreas of this reptile is located throughout the spleen side of the organ and consists of islet-like structures, small groups of two to five cells, and single scattered endocrine cells. The endocri...

journal_title：General and comparative endocrinology

authors： López J,Echevarría M,Vázquez JJ

更新日期：1988-08-01 00:00:00

abstract：:TSH-like producing cells have been studied using the peroxidase-antiperoxidase (PAP) immunohistochemical technique and rabbit anti-human thyrotropin (TSH) antiserum in the pars distalis of five species of amphibian anuran tadpoles at different stages of development as well as in 1-year-old postmetamorphic animals. Thi...

journal_title：General and comparative endocrinology

authors： García-Navarro S,Malagón MM,Gracia-Navarro F

更新日期：1988-07-01 00:00:00

abstract：:Hagfish, Myxine glutinosa, were used in a series of experiments to determine a possible role for calcitonin in plasma and urine electrolyte balance. Individual animals were anaesthetised and implanted with polythene cannulae for monitoring blood pressure and for infusion/injection. Urine was collected by manual palpat...

journal_title：General and comparative endocrinology

authors： Wales NA

更新日期：1988-07-01 00:00:00

abstract：:Implantation of cortisol pellets in a dorsal lymph sac reduced the frequency with which toads replaced the strata cornea of the epidermis. Except in a few cases, however, the replaced strata cornea were not shed as in a normal moult. The mean interval between replacements of strata cornea rose from about 9-10 days in ...

journal_title：General and comparative endocrinology

authors： Jørgensen CB

更新日期：1988-07-01 00:00:00

abstract：:The photoperiodic control of puberty in birds was studied using hybrid red-legged partridges (Alectoris graeca chukar). In the wild partridges first breed at about 10 months of age. Males and females were held from hatch on short (8L:16D) daylengths and then at 3, 4 1/2, 6, 7 1/2, 9, and 12 weeks of age groups were tr...

journal_title：General and comparative endocrinology

authors： Creighton JA

更新日期：1988-07-01 00:00:00

abstract：:We studied the in vitro effects of JH III and ecdysterone on RNA synthesis and secretory activities of the left colleterial gland (LCG) in mature females of Periplaneta americana during the reproductive cycle. We found that RNA synthesis is a cyclic and highly dynamic process. The major increases in poly(A)- RNA synth...

journal_title：General and comparative endocrinology

authors： Iris FJ,Sin FY

更新日期：1988-07-01 00:00:00

abstract：:Components of the renin angiotensin system have been identified in many nonmammalian vertebrates. However, in many of these animals, including reptiles, the physiological functions and importance of the system remain unclear. To aid in the study of the system in a reptile we modified a commercially available radioimmu...

journal_title：General and comparative endocrinology

authors： Stephens GA,Caron B

更新日期：1988-06-01 00:00:00

abstract：:Two aspects of hormonal control of aggressive territorial behavior in male mountain spiny lizards Sceloporus jarrovi were studied. First, testosterone (T) implants were given to free-living castrated males during the breeding season. These implants fully restored breeding season levels of aggressive and sexual behavio...

journal_title：General and comparative endocrinology

authors： Moore MC

更新日期：1988-06-01 00:00:00

abstract：:In vitro studies with liver homogenates of brook charr (Salvelinus fontinalis) demonstrate that the conversion of thyroxine (T4) to triiodothyronine (T3) is dependent upon temperature, pH, substrate, and homogenate concentration, supporting the hypothesis of an enzymatic hepatic T4 to T3 conversion. Dithiothreitol has...

journal_title：General and comparative endocrinology

authors： Vijayan MM,Flett PA,Leatherland JF

更新日期：1988-05-01 00:00:00

abstract：:We compared the developmental pattern of thyroid function and its pituitary control in precocial Japanese quail and altricial Ring doves. We measured thyroid hormone (TH) content of thyroid glands (TG), TH concentrations in the serum, relative pituitary gland thyrotropin (PG-TSH) content, and the ability of the TG to ...

journal_title：General and comparative endocrinology

authors： McNichols MJ,McNabb FM

更新日期：1988-04-01 00:00:00

abstract：:Changes in plasma luteinizing hormone (LH), testosterone, thyroxine (T4), and triiodothyronine (T3) and the height of supraorbital combs were compared in captive willow ptarmigan (Lagopus lagopus lagopus) and Svalbard ptarmigan (Lagopus mutus hyperboreus) exposed to an artificial annual cycle of daylength simulating t...

journal_title：General and comparative endocrinology

authors： Stokkan KA,Sharp PJ,Dunn IC,Lea RW

更新日期：1988-04-01 00:00:00

abstract：:A corticotropin-releasing factor (CRF)-like system has been identified in eels (Anguilla anguilla, A. rostrata, and A. japonica) with immunocytochemical techniques. Immunoreactive perikarya were located in the preoptic area, in magno- and parvocellular regions of the preoptic nucleus. Fine fibers reached the pituitary...

journal_title：General and comparative endocrinology

authors： Olivereau M,Moons L,Olivereau J,Vandesande F

更新日期：1988-04-01 00:00:00

abstract：:Two experiments were conducted to further examine the interaction of social stimuli and photoperiod on cloacal and gonadal responses in male Japanese quail. In experiment 1, adult males kept on a maximal (15L:9D) stimulatory photoperiod were surgically deafened and/or visually isolated from roommates. After 6 weeks, t...

journal_title：General and comparative endocrinology

authors： Kerlan JT,Blumenthal DC,Gilsdorf JT,Greenspon JM

更新日期：1988-03-01 00:00:00

abstract：:Thyroidectomy and castration in Calotes versicolor significantly decreased the activities of hepatic mitochondrial cytochrome oxidase, alpha-glycerophosphate dehydrogenase (alpha-GPDH), and succinate dehydrogenase (SDH) when compared to sham-operated controls. Administration of thyroid hormones in thyroidectomized liz...

journal_title：General and comparative endocrinology

authors： Oommen OV,Sreedeviamma KK

更新日期：1988-03-01 00:00:00

abstract：:Endocrine cells were detected at premetamorphosis, prometamorphosis, climax, and juvenile stages using an amine-inducing fluorescence technique with or without previous L-3,4-dihydroxyphenylalanine (L-DOPA) treatment. At premetamorphosis, serotonin cells exhibited yellow fluorescence in the gut primary epithelium of t...

journal_title：General and comparative endocrinology

authors： L'Hermite A,Hourdry J,Ferrand R

更新日期：1988-03-01 00:00:00

abstract：:Gonadotropin-releasing hormone (GnRH) was detected in the brains of passerine birds, a recently evolved and diverse avian group. The molecular forms of GnRH in two species of birds under breeding conditions were deduced using methods of HPLC and immunology. The brain extracts of song sparrows (Melospiza melodia) conta...

journal_title：General and comparative endocrinology

authors： Sherwood NM,Wingfield JC,Ball GF,Dufty AM

更新日期：1988-03-01 00:00:00

abstract：:The hybrids of carp (Cyprinus carpio) and goldfish (Carassius auratus) collected from the lower Great Lakes between 1978 and 1981 exhibited epizootics of gonadal neoplasm which were rare in the parental species. The pituitary glands of hybrids were, on average, 2.5 times larger than that of carp of similar body size. ...

journal_title：General and comparative endocrinology

authors： Down NE,Peter RE,Leatherland JF

更新日期：1988-02-01 00:00:00

abstract：:The peroxidase-antiperoxidase (PAP) immunocytochemical technique and rabbit antihuman prolactin (PRL) antiserum were used to localize and identify PRL-producing cells in the pars distalis of Bufo calamita, Hyla meridionalis, Alytes cisternasii, Pelobates cultripes, and Rana perezi tadpoles at different stages of devel...

journal_title：General and comparative endocrinology

authors： Garcia-Navarro S,Malagon MM,Garcia-Herdugo G,Gracia-Navarro F

更新日期：1988-02-01 00:00:00

abstract：:The administration of arginine vasotocin (AVT) to gravid snapping turtles with steroidogenically active corpora lutea and high plasma progesterone concentration (1480 +/- 155 pg/ml) did not trigger oviposition, whereas 12 days after ovulation when luteolysis occurred and plasma progesterone concentration was low (570 ...

journal_title：General and comparative endocrinology

authors： Mahmoud IY,Cyrus RV,McAsey ME,Cady C,Woller MJ

更新日期：1988-01-01 00:00:00

abstract：:Ovarian follicles isolated from rainbow trout during early exogenous vitellogenesis were used to study the in vitro effects of thyroid hormones on salmon gonadotropin (GtH)-induced estradiol-17 beta (E2) secretion. Triiodothyronine (T3) alone did not alter E2 secretion but T3 in the presence of GtH (0.5 micrograms/ml)...

journal_title：General and comparative endocrinology

authors： Cyr DG,Eales JG

更新日期：1988-01-01 00:00:00

abstract：:Changes in the circulating levels of thyroid hormones measured by radioimmunoassay in yearling coho salmon in response to injection of bovine thyroid-stimulating hormone (TSH) were evaluated from January through August. Doses of TSH ranging from 0.2 to 6.4 micrograms/g body wt were ineffective in stimulating T4 in Jan...

journal_title：General and comparative endocrinology

authors： Swanson P,Dickhoff WW

更新日期：1987-12-01 00:00:00

abstract：:Chronic confinement for 1 month caused a significant elevation of plasma cortisol but suppressed the levels of plasma testosterone and 11-ketotestosterone in sexually mature male brown trout. An acute handling stress for 1 hr elevated blood cortisol and ACTH levels and also suppressed circulating androgens. This andro...

journal_title：General and comparative endocrinology

authors： Pickering AD,Pottinger TG,Carragher J,Sumpter JP

更新日期：1987-11-01 00:00:00

abstract：:The insulin receptors of frog brain and liver show features typical of other insulin receptors with regard to affinity and specificity of binding to insulins and proinsulin, solubility in Triton X-100, binding to and elution from wheat germ agglutinin, and insulin-sensitive tyrosine kinase activity. Likewise, the brai...

journal_title：General and comparative endocrinology

authors： Hart C,Shemer J,Penhos JC,Lesniak MA,Roth J,LeRoith D

更新日期：1987-11-01 00:00:00

abstract：:Histochemical assays, hormonal quantitation, and steroid biosynthetic studies were carried out with adrenal glands obtained from four stranded whales of two different species (Kogia breviceps and Mesoplodon europaeus), and selected comparisons were made with the results of similar studies of adrenals from terrestrial ...

journal_title：General and comparative endocrinology

authors： Carballeira A,Brown JW,Fishman LM,Trujillo D,Odell DK

更新日期：1987-11-01 00:00:00

abstract：:The binding of 125I-labeled ovine prolactin (oPRL) to membrane preparations of several tissues from the male green frog, Rana esculenta, collected during the year is reported. PRL binding to kidney fractions was generally high (range 5-45%). A maximum was observed in the month of October, whereas the lowest value was ...

journal_title：General and comparative endocrinology

authors： d'Istria M,Fasano S,Delrio G

更新日期：1987-10-01 00:00:00

abstract：:In order to examine the role of thyroid hormones during salmonid development, techniques were developed for quantitative extraction of thyroxine from eggs, whole embryos, and alevins of chum salmon (Oncorhynchus keta) at various stages of development. Frozen eggs, embryos, alevins, or fry were homogenized in ice-cold ...

journal_title：General and comparative endocrinology

authors： Tagawa M,Hirano T

更新日期：1987-10-01 00:00:00

abstract：:Uterine electromyographic activity (EMG), plasma concentrations of prostaglandin (PG) F and E, and arginine vasotocin (AVT) were simultaneously measured in relation to PGE2-induced premature oviposition and to indomethacin-blocked oviposition in chickens. The administration of indomethacin (5 mg, im) 3 hr before the p...

journal_title：General and comparative endocrinology

authors： Saito N,Shimada K,Koike TI

更新日期：1987-09-01 00:00:00

abstract：:Immunochemical investigations, using dot immunobinding assay (DIA) and enzyme-linked immunosorbent assay (ELISA), and immunocytochemical studies reveal the following new information about crustacean vitellogenesis-inhibiting hormone (VIH): (1) The structure of VIH is sufficiently different from that of the other sinus...

journal_title：General and comparative endocrinology

authors： Meusy JJ,Martin G,Soyez D,van Deijnen JE,Gallo JM

更新日期：1987-09-01 00:00:00