abstract：:Thiouracil-induced hypothyroidism reduced the thymus weights of young chickens. Thyroid weights were greater in thiouracil-fed (TF) chicks, and the circulating levels of triiodothyronine and thyroxine were lower. Thiouracil treatment resulted in higher relative adrenal weights and serum corticosterone concentrations. ...

journal_title：General and comparative endocrinology

authors： Scott T,Glick B

更新日期：1987-08-01 00:00:00

abstract：:The skin of Xenopus laevis, because of its high concentrations of amidated peptides, is an excellent model for the study of neuropeptide biosynthesis. In this paper we determined levels of the mRNAs which encode cerulin and characterized the enzymatic activity which likely produces the carboxyl terminal alpha-amide mo...

journal_title：General and comparative endocrinology

authors： Spindel ER,Eipper BA,Zilberberg MD,Mains RE,Chin WW

更新日期：1987-07-01 00:00:00

abstract：:We have studied the effects of bovine parathyroid hormone (PTH) and salmon calcitonin (CT) on plasma calcium (Ca) and phosphate levels and on renal function in intact and parathyroidectomized (PTX) chickens, using a simple technique that separates urine from feces. In immature males and egg-laying females, the intrave...

journal_title：General and comparative endocrinology

authors： Sommerville BA,Fox J

更新日期：1987-06-01 00:00:00

abstract：:Pregnant female spiny dogfish were captured off the coasts of Maine and Massachusetts and morphometric and gravimetric analyses of the liver, gonad, and reproductive tract correlated with the reproductive cycle. Plasma samples were taken and circulating steroids (progesterone, testosterone, and estradiol) were measure...

journal_title：General and comparative endocrinology

authors： Tsang PC,Callard IP

更新日期：1987-05-01 00:00:00

abstract：:An in vitro investigation has clarified the neuroendocrine mechanism responsible for the differentiation of the female gonad in the protandrous hermaphrodite Crepidula fornicata. The male gonads were used as target organs; in some experiments they were brought to a uniform resting state by prior decerebration of donor...

journal_title：General and comparative endocrinology

authors： Feral C,Le Gall S,Martin MC,Lengronne C

更新日期：1987-03-01 00:00:00

abstract：:We investigated the effect of several potential carbohydrate secretagogues, amino acids, a ketoacid, and potassium chloride on insulin, glucagon, and somatostatin release from the in vitro perfused Brockmann body of channel catfish (Ictalurus punctatus). Mannose (15 mM) stimulated the release of insulin and somatostat...

journal_title：General and comparative endocrinology

authors： Ronner P,Scarpa A

更新日期：1987-03-01 00:00:00

abstract：:Several antisera specific to neuropeptides of vertebrates were applied to sections of the earthworm Eisenia fetida Sav. Some of them were able to reveal specific neurones of the supraoesophageal ganglion: h-GHRF, CRF, Leu- and Met-enkephalin, dynorphin, substance P, CCK-8, and CCK-8S. A map of different areas or nucle...

journal_title：General and comparative endocrinology

authors： Lkhider M,Marcel R,Tramu G

更新日期：1987-03-01 00:00:00

abstract：:Immunohistochemical methods using affinity adsorbed antibodies raised against the three families of calcitonins (CT) were applied to ultimobranchial (UB) cells in situ to investigate the nature of the Chelonian calcitonin molecule and its distribution in the ultimobranchial bodies of the freshwater turtle, Pseudemys s...

journal_title：General and comparative endocrinology

authors： Boudbid H,Leger AF,Pidoux E,Volle GE,Taboulet J,Moukhtar MS,Treilhou-Lahille F

更新日期：1987-03-01 00:00:00

abstract：:A salmon calcitonin (CT)-like peptide was characterized in various crustaceans by radioimmunological and radioreceptor assays. The highest levels of the molecule were found in the anterior part of the gut and the hepatopancreas of the Norway lobster: Nephrops norvegicus. Molecular sieving of this molecule suggested an...

journal_title：General and comparative endocrinology

authors： Fouchereau-Peron M,Arlot-Bonnemains Y,Milhaud G,Moukhtar MS

更新日期：1987-02-01 00:00:00

abstract：:The relative affinities and maximum capacities of the classes of L-thyroxine (T4)- and 3,5,3'-triiodo-L-thyronine (T3)-binding sites in plasma of three species of salmonid teleost fish were determined by saturation analysis on miniature Sephadex G-25 columns at 20-21 degrees and kinetic data were analyzed by the multi...

journal_title：General and comparative endocrinology

authors： Eales JG

更新日期：1987-02-01 00:00:00

abstract：:Classical biotin deficiency in young chickens is characterized by a reduction in the activity of liver biotin-dependent enzymes which thus impairs gluconeogenesis during periods of food withdrawal. Because the normal bird maintains an elevated fasting blood glucose level, the ability of the classically biotin-deficien...

journal_title：General and comparative endocrinology

authors： Klandorf H,Clarke BL,Brown J

更新日期：1987-01-01 00:00:00

abstract：:Plasma concentrations of growth hormone (GH) were decreased following the intravenous administration of morphine sulfate. Maximum inhibition of GH secretion was observed 40 min after morphine sulfate challenge. At this time, doses of morphine sulfate (at 5 mg and 50 mg/kg) reduced the GH concentrations by 86 and 90%, ...

journal_title：General and comparative endocrinology

authors： Harvey S,Scanes CG

更新日期：1987-01-01 00:00:00

abstract：:Endocrine cells in the gut of Sparus auratus L. (gilt-head sea bream) have been demonstrated by immunocytochemical and electron microscopic techniques. Cells showing somatostatin and gastrin-like immunoreactivity were found in the depth of the gastric folds and in the upper part of the stomach glands while substance P...

journal_title：General and comparative endocrinology

authors： Elbal MT,Agulleiro B

更新日期：1986-12-01 00:00:00

abstract：:A technique is described for the measurement of cytoplasmic free calcium concentration ([Ca2+]c) in a suspension of goby intestinal epithelial cells using the fluorescent probe quin2. For 18 cell suspensions, [Ca2+]c was determined to be 142 +/- 14 nM. The caudal neurosecretory peptide urotensin II at 10(-7) to 10(-6)...

journal_title：General and comparative endocrinology

authors： Loretz CA,Assad JA

更新日期：1986-12-01 00:00:00

abstract：:Juvenile coho salmon, Oncorhynchus kisutch, were either immersed in thyroxin-containing water (T4; 20 micrograms/ml) or implanted with cortisol (5 mg), bovine growth hormone (GH; 1.5 microgram/g body wt), or ovine prolactin (PRL; 1.5 microgram/g body wt), both early and late in smoltification. T4 and cortisol treatmen...

journal_title：General and comparative endocrinology

authors： Sheridan MA

更新日期：1986-11-01 00:00:00

abstract：:Arginine vasotocin (AVT) and oxytocin (OXY), in the dose range of 2 X 10(-13)-2 X 10(-8) mol, were found to be potent vasoconstrictors of the arterioarterial pathway of isolated perfused eel gills. AVT was significantly (P less than 0.05) more potent than OXY, as indicated by the results of both dose- and concentratio...

journal_title：General and comparative endocrinology

authors： Bennett MB,Rankin JC

更新日期：1986-10-01 00:00:00

abstract：:Explants of tail fin from tadpoles of Rana catesbeiana maintained in tissue culture underwent resorption when exposed to a medium containing 150 nM thyroxine (T4). Increases in the specific activity of hexosaminidase (Hex) and of acid phosphatase (AP) were associated with this response. Ovine prolactin inhibited resor...

journal_title：General and comparative endocrinology

authors： Ray LB,Dent JN

更新日期：1986-10-01 00:00:00

abstract：:The titer of moulting hormones (ecdysteroids) in fifth instar male Rhodnius displays a gradual decline throughout the week preceding ecdysis when animals are maintained in constant light (LL). Multiple sampling of haemolymph from the same animal reveals a constant rate of decline with no increases in titer observed. H...

journal_title：General and comparative endocrinology

authors： Ampleford EJ,Steel CG

更新日期：1986-09-01 00:00:00

abstract：:Melanophore-stimulating hormone (MSH) release from the pars intermedia of the pituitary gland is probably regulated by multiple factors of hypothalamic origin. We have examined a number of potential regulatory factors for their effects on MSH release from the amphibian Xenopus laevis. Serotonin and acetylcholine have ...

journal_title：General and comparative endocrinology

authors： Verburg-van Kemenade BM,Jenks BG,van Overbeeke AP

更新日期：1986-09-01 00:00:00

abstract：:Plasma glucagon levels in 11 different teleosts and in dogfish were evaluated using an adapted classical mammalian radioimmunoassay (RIA). The values obtained are considered relative; sensitivity was inferior to the original method, but the validation experiment results are acceptable. The mean value of the coefficien...

journal_title：General and comparative endocrinology

authors： Gutierrez J,Fernandez J,Blasco J,Gesse JM,Planas J

更新日期：1986-09-01 00:00:00

abstract：:In vivo studies were carried out in adult chickens in an attempt to evaluate the effectiveness of somatostatin (SRIF) in regulating hormone secretion from the splenic pancreatic lobe after 99% of the pancreatic mass was surgically ablated. Sixteen days after either sham operation or 99% pancreatectomy, birds were infu...

journal_title：General and comparative endocrinology

authors： Cieslak SR,Hazelwood RL

更新日期：1986-08-01 00:00:00

abstract：:The role of cyclic AMP (cAMP) as mediator of ACTH action on interrenal steroidogenesis was evaluated in juvenile coho salmon (Oncorhynchus kisutch). Head kidneys (containing the interrenal cells) were incubated in the absence or presence of putative adenylate cyclase activators (forskolin and cholera toxin), ACTH comb...

journal_title：General and comparative endocrinology

authors： Patiño R,Bradford CS,Schreck CB

更新日期：1986-08-01 00:00:00

abstract：:By use of the indirect immunofluorescence method in conjunction with an elution-restaining technique, cells in the caudal neurosecretory system of the big skate (Raja binoculata) and the plainfin midshipman (Porichthys notatus) were shown to contain both urotensin I (UI)/corticotropin-releasing factor (CRF) and uroten...

journal_title：General and comparative endocrinology

authors： Onstott D,Elde R

更新日期：1986-08-01 00:00:00

abstract：:The penultimate instar larvae of Mamestra brassicae have one ecdysteroid peak 2 days after ecdysis which induces larval ecdysis. Allatectomy deleted this peak and caused a larger peak 7 days later just before precocious pupation, in a pattern similar to the ecdysteroid titer of the last instar. Application of juvenile...

journal_title：General and comparative endocrinology

authors： Hiruma K

更新日期：1986-08-01 00:00:00

abstract：:Corticosterone, progesterone, estradiol-17 beta, and estrone were quantified in plasma collected weekly (April-September) from renesting and nonlaying female American kestrels (Falco sparverius) paired with males in captivity. Hormone levels and body weights for laying females were maximal during courtship and egg-lay...

journal_title：General and comparative endocrinology

authors： Rehder NB,Bird DM,Laguë PC

更新日期：1986-06-01 00:00:00

abstract：:Intact White Leghorn chick embryos were treated daily (on Days 6-13) with bovine prolactin (PRL) or ovine growth hormone (GH) at doses of 4-10 micrograms/g embryo wet wt. A control group received an equal volume of avian saline. [Na+] and [Cl-] were determined in allantoic fluid samples taken on Days 10, 12, and 14, a...

journal_title：General and comparative endocrinology

authors： Murphy MJ,Brown PS,Brown SC

更新日期：1986-06-01 00:00:00

abstract：:A radioimmunoassay (RIA) capable of determining blood ACTH levels in salmonid fishes was developed and validated. The RIA used an antibody raised against mammalian ACTH, iodinated human ACTH as tracer, and human 1-39 ACTH as standard. Incubation of the standard or unknown with antibody for 3 days before addition of as...

journal_title：General and comparative endocrinology

authors： Sumpter JP,Donaldson EM

更新日期：1986-06-01 00:00:00

abstract：:The effects of calcium on steroidogenesis and cyclic AMP production in chicken granulosa cells were examined. For the expression of full steroidogenic effects by LH, forskolin, and 8-bromo cyclic AMP the presence of calcium in the incubation medium was essential, the optimal concentration being 1 mM. Moreover, calcium...

journal_title：General and comparative endocrinology

authors： Asem EK,Hertelendy F

更新日期：1986-04-01 00:00:00

abstract：:The effect of thyrotropin releasing hormone (TRH) administered intramuscularly (im) on serum levels of prolactin (Prl) in ovariectomized (ovx) adult turkeys before and following the onset of photostimulation, before and during daily administration (im) of progesterone (P; 0.1, 0.4, or 1.0 mg/kg), estradiol benzoate (E...

journal_title：General and comparative endocrinology

authors： Saeed W,el Halawani ME

更新日期：1986-04-01 00:00:00

abstract：:The possum is a seasonally breeding marsupial which gives birth in Queensland from March through to September. To ascertain whether this seasonality in breeding is manifest in the male reproductive system, body weight and plasma testosterone concentrations were examined in five possums. Plasma testosterone concentrati...

journal_title：General and comparative endocrinology

authors： Gemmell RT,Cepon G,Barnes A

更新日期：1986-04-01 00:00:00

abstract：:The circulating serum concentrations of various steroid hormones in mature sockeye salmon were measured at four different developmental stages in their upstream migration to spawn at Adams River in British Columbia, Canada. In females, a high level of estradiol-17 beta was found in fish at the first location, and it p...

journal_title：General and comparative endocrinology

authors： Truscott B,Idler DR,So YP,Walsh JM

更新日期：1986-04-01 00:00:00

abstract：:We have found that the inhibition of thyroxine-induced tail fin regression by prolactin in larval tiger salamanders is antagonized by oxytocin. Other workers have shown that prolactin blocks the rise in activity of several hydrolytic enzymes that occurs in regressing tissue during metamorphosis. Here, we examine the e...

journal_title：General and comparative endocrinology

authors： Platt JE,Brown GB,Erwin SA,McKinley KT

更新日期：1986-03-01 00:00:00

abstract：:Metabolic pathways of estradiol-17 beta and other vertebrate steroid hormones of cultured silkworm pupal ovaries were examined using 14C-labeled steroids. The isolated ovaries showed significant uptake and metabolic activity of the 14C-labeled estradiol-17 beta added to the medium. Analysis of the metabolized compound...

journal_title：General and comparative endocrinology

authors： Ogiso M,Fujimoto Y,Ikekawa N,Ohnishi E

更新日期：1986-03-01 00:00:00

abstract：:A biochemical analysis was made of the crustacean hyperglycemic hormone (CHH) of the crayfish Astacus leptodactylus, as present in the CHH-producing perikarya, in the axonal tract and in the sinus gland, respectively. Hyperglycemic material was analyzed by polyacrylamide gel electrophoresis (PAGE and SDS-PAGE) and hig...

journal_title：General and comparative endocrinology

authors： Kallen JL,Reijntjens FM,Peters DJ,Van Herp F

更新日期：1986-02-01 00:00:00

abstract：:We demonstrated the presence of specific binding sites for bullfrog luteinizing hormone (LH) and follicle-stimulating hormone (FSH) in a testicular crude plasma membrane fraction of the bullfrog, Rana catesbeiana. The equilibrium analysis of the binding showed that a straight line was fitted to the Scatchard plot of L...

journal_title：General and comparative endocrinology

authors： Takada K,Kubokawa K,Ishii S

更新日期：1986-02-01 00:00:00

abstract：:In fish there are few data on the gonadotropin-releasing hormone (Gn-RH) neurosecretory activity, which could explain long- and short-term variations of the gonadotropin secretion. There is no biological species specificity between mammal and fish Gn-RH; although there is a structural difference, they are, on the cont...

journal_title：General and comparative endocrinology

authors： Breton B,Motin A,Billard R,Kah O,Geoffre S,Precigoux G

更新日期：1986-01-01 00:00:00

abstract：:Female red-sided garter snakes (Thamnophis sirtalis parietalis) exhibit a complex array of behavioral patterns. Females may mate once, more than once, or not at all in the spring of the year, and a high percentage of females may mate in late summer before returning to winter hibernacula. The role of mating in the indu...

journal_title：General and comparative endocrinology

authors： Whittier JM,Crews D

更新日期：1986-01-01 00:00:00

abstract：:Sex steroid levels in the plasma of the female Pleurodeles waltl were determined by radioimmunoassay of blood samples taken monthly from each newt during an 18-month period. Estradiol-17 beta levels were relatively high (greater than 1 ng/ml) but androgen levels were higher (2-30 ng/ml). Androgen and estradiol-17 beta...

journal_title：General and comparative endocrinology

authors： Garnier DH

更新日期：1985-12-01 00:00:00

abstract：:Ovaries from the leopard frog, Rana pipiens, and bullfrog, R. catesbeiana, were used to study potential direct extrapituitary effects of gonadotropin-releasing hormone (GnRH). GnRH alone did not alter steroid secretion from ovaries in either species. Ovarian fragments containing mature follicles from R. pipiens were i...

journal_title：General and comparative endocrinology

authors： Hubbard GM,Licht P

更新日期：1985-11-01 00:00:00

abstract：:Methallibure treatment (1 mg fed on alternate days to a female and a male kept in 1 liter of 25% seawater) started from 1 or 7 days postpartum (early gestation) inhibited gestation in the wild guppy, Poecilia reticulata. A few of the fish treated from 7 days postpartum (2/9) did give birth, but the young either were d...

journal_title：General and comparative endocrinology

authors： Lam TJ,Pavri C,Ng KL

更新日期：1985-11-01 00:00:00