Isolation and identification of testosterone from the serum and testes of the American lobster (Homarus americanus).

abstract：:Neonatal handling of captive vertebrates can shape the development of their hypothalamo-pituitary-adrenal (HPA) axis and alter their ability to respond to stressful stimuli later in life. However, the long-term effects of such handling on this endocrine axis in free-living species are not well understood. We investiga...

journal_title：General and comparative endocrinology

authors： Lynn SE,Kern MD,Phillips MM

更新日期：2013-06-01 00:00:00

abstract：:In bony fishes, both corticotropin-releasing factor (CRF) and urotensin-I play a role in the regulation of interrenal glucocorticoid release. The rainbow trout, Oncorhynchus mykiss, is a useful model for understanding the mechanisms of stress and the hypothalamo-pituitary-interrenal axis because of its phylogenetic po...

journal_title：General and comparative endocrinology

authors： Barsyte D,Tipping DR,Smart D,Conlon JM,Baker BI,Lovejoy DA

更新日期：1999-08-01 00:00:00

abstract：:Stress has long lasting effects on physiology, development, behavior, reproductive success and the survival of an individual. These effects are mediated by glucocorticoids, such as corticosterone, via glucocorticoid receptors (GR), however the exact mechanisms underlying these effects are unknown. GR have been widely ...

journal_title：General and comparative endocrinology

authors： Shahbazi M,Schmidt M,Carruth LL

更新日期：2011-12-01 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：:Arginine vasotocin (AVT) and isotocin (IT) are fish hypothalamic nonapeptides involved in numerous social and reproductive behaviors. Vasotocinergic and isotocinergic fibers project to different brain areas where peptides act as neurotransmitters and/or neuromodulators. In this study, we measured whole brain levels of...

journal_title：General and comparative endocrinology

authors： Kulczykowska E,Kleszczyńska A

更新日期：2014-08-01 00:00:00

abstract：:Testosterone has been suggested to be involved in the regulation of male territorial behavior. For example, seasonal peaks in testosterone typically coincide with periods of intense competition between males for territories and mating partners. However, some species also express territorial behavior outside a breeding...

journal_title：General and comparative endocrinology

authors： Apfelbeck B,Mortega K,Kiefer S,Kipper S,Vellema M,Villavicencio CP,Gahr M,Goymann W

更新日期：2013-04-01 00:00:00

abstract：:Maintaining energy balance and reproducing are important for fitness, yet animals have evolved mechanisms by which the hypothalamus-pituitary-adrenal/interrenal (HPA/HPI) axis can shut these activities off. While HPA/HPI axis inhibition of feeding and reproduction may have evolved as a predator defense, to date there ...

journal_title：General and comparative endocrinology

authors： Harris BN,Carr JA

更新日期：2016-05-01 00:00:00

abstract：:Serum levels of prolactin were determined in nonbreeding male and female canvasbacks (Aythya valisineria) from mid-April to late June to evaluate the temporal changes occurring during spring. During this time interval, serum prolactin levels increased 1.5- to 2-fold in both males and nonlaying females (P less than 0.0...

journal_title：General and comparative endocrinology

authors： Bluhm CK,Phillips RE,Burke WH

更新日期：1989-11-01 00:00:00

abstract：:The developmental sequence of markers for hematopoietic, hormone-producing, and folliculo-stellate cells in the chicken adenohypophysis is described using immunohistochemical staining techniques. Hematopoietic cells are detected in cryosections of the adenohypophysis starting from 10- or 12-day embryos, using chicken-...

journal_title：General and comparative endocrinology

authors： Allaerts W,Boonstra-Blom AG,Peeters K,Janse EM,Berghman LR,Jeurissen SH

更新日期：1999-05-01 00:00:00

abstract：:Pinealectomized and intact chicks raised under cyclic (14L:10D) and noncyclic (OL;24L) conditions of environmental lighting were sampled 60 hr and 6 weeks after pinealectomy to evaluate the effects of pineal ablation on plasma and ocular melatonin concentrations. Little or no immunoreactive melatonin was present in pl...

journal_title：General and comparative endocrinology

authors： Osol G,Schwartz B,Foss DC

更新日期：1985-06-01 00:00:00

abstract：:In many mammal species, androgen levels in males are elevated during periods of mating activity, often to facilitate aggressive behavior between males over access to fertile females. However, this pattern might be less obvious in species with a rather low male-male aggression rate, or in those that are not strictly se...

journal_title：General and comparative endocrinology

authors： Wolf TE,Schaebs FS,Bennett NC,Burroughs R,Ganswindt A

更新日期：2018-01-01 00:00:00

abstract：:Hypothalamic kisspeptin plays a pivotal role in the regulation of the hypothalamic-pituitary-gonadal axis by stimulating gonadotropin-releasing hormone (GnRH) release into the portal circulation, with the subsequent release of gonadotropins. Kisspeptin and its receptor, the kisspeptin 1 receptor (Kiss1R), are also exp...

journal_title：General and comparative endocrinology

authors： Mijiddorj T,Kanasaki H,Sukhbaatar U,Oride A,Hara T,Kyo S

更新日期：2017-05-15 00:00:00

abstract：:In dairy cows, heat stress depresses appetite, leading to decreased food intake, a negative energy balance, and modifies ghrelin levels. Ghrelin is a gut-brain peptide with two major forms: acylated, with an O-n-octanoylated serine in position 3, and nonacylated. To date, the effect of heat stress and estrous cycle on...

journal_title：General and comparative endocrinology

authors： Honig H,Ofer L,Elbaz M,Kaim M,Shinder D,Gershon E

更新日期：2016-09-01 00:00:00

abstract：:Serum cortisol levels were measured in a total of 73 tammar wallabies maintained in a captive population at Macquarie University, NSW, Australia. Previous studies of corticosteroids in marsupials have generally involved low sample numbers, a diverse array of analytical techniques, and a variety of sampling conditions....

journal_title：General and comparative endocrinology

authors： McKenzie S,Deane EM

更新日期：2003-10-01 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：:Plasma progesterone concentrations were measured every 2 or 3 days in eastern quoll, Dasyurus viverrinus, during pregnancy (20.5 +/- 0.8 days, n = 6, mean +/- SEM) and the estrous cycle (37.5 +/- 0.7 days, n = 20, mean +/- SEM). The pattern was not apparently different between the two reproductive states. There was a ...

journal_title：General and comparative endocrinology

authors： Hinds LA

更新日期：1989-07-01 00:00:00

abstract：:Fluctuations in plasma androgen (testosterone and 5 alpha-dihydrotestosterone), corticosterone (B), and luteinizing hormone (LH) of male bullfrogs in central California were measured during the spring mating season. Androgen and LH levels generally increased in the population prior to the initiation of chorusing and e...

journal_title：General and comparative endocrinology

authors： Mendonça MT,Licht P,Ryan MJ,Barnes R

更新日期：1985-05-01 00:00:00

abstract：:Allatostatin-like immunoreactivity was demonstrated in the central nervous system (CNS) neurons of the freshwater pulmonate snails Bulinus globosus (Planorbidae) and Stagnicola elodes (Lymnaeidae). Immunopositive neurons were localized using a monoclonal antibody highly specific to allatostatin I (APSGAQRLYGFGL-amide)...

journal_title：General and comparative endocrinology

authors： Rudolph PH,Stay B

更新日期：1997-05-01 00:00:00

abstract：:Prolactin (PRL) and two variants of growth hormone (GH), purified from pituitaries of striped bass (Morone saxatilis) and its hybrid with white bass (M. saxatilis x M. chrysops) by gel filtration chromatography under alkaline conditions followed by reversed-phase high pressure liquid chromatography, appear similar bet...

journal_title：General and comparative endocrinology

authors： Jackson LF,Swanson P,Duan C,Fruchtman S,Sullivan CV

更新日期：2000-01-01 00:00:00

abstract：:In the genetic sex determination of vertebrates, the gonadal sex depends on the combination of sex chromosomes that a zygote possesses. Despite the discovery of the sex-determining gene (SRY/Sry) in mammals in 1990s, the sex-determining gene in non-mammalian vertebrates remained an enigma for over a decade. In most ma...

journal_title：General and comparative endocrinology

authors： Matsuda M,Sakaizumi M

更新日期：2016-12-01 00:00:00

abstract：:Methyl farnesoate (MF) stimulation of ecdysteroid secretion by Y-organs of the crab, Cancer magister, is demonstrated. Isolated Y-organs that were incubated with a mandibular organ (MO) secreted significantly higher levels of ecdysteroids into the medium when compared to those incubated in the absence of a MO. MOs sec...

journal_title：General and comparative endocrinology

authors： Tamone SL,Chang ES

更新日期：1993-03-01 00:00:00

abstract：:The effects of PGE1, PGE2, PGF2 alpha (2 micrograms/ml), and forskolin (10 microM) on follicle contraction of brook trout (salvelinus fontinalis) were studied by measuring the weight loss of punctured follicles during in vitro incubation. PGE1, PGE2, and forskolin significantly inhibited spontaneous contraction of fol...

journal_title：General and comparative endocrinology

authors： Hsu SY,Goetz FW

更新日期：1992-12-01 00:00:00

abstract：:The rainbow trout (Oncorhynchus mykiss) ovarian gonadotropin (GTH II) receptor was solubilized by extraction with the nonionic detergent 1% Triton X-100 in the presence of 20% glycerol. The hormone-binding characteristics of the soluble receptors were similar to those of membrane-bound receptors: the Scatchard plot of...

journal_title：General and comparative endocrinology

authors： Quesnel H,Breton B

更新日期：1993-09-01 00:00:00

abstract：:A clone encoding thyroid hormone receptor-beta (TR-beta) was isolated from a sea bream (Sparus aurata) ovary cDNA library. Sea bream (sb)TR-beta is closely related to its counterparts from other vertebrates and, like them, preferentially binds T3 rather than T4. However, the putative sbTR-beta protein contains a nine-...

journal_title：General and comparative endocrinology

authors： Nowell MA,Power DM,Canario AV,Llewellyn L,Sweeney GE

更新日期：2001-07-01 00:00:00

abstract：:The development and dynamics of TSH and GTH cells were studied immunohisto- and immunocytochemically in the salamander Hynobius retardatus, which had been reported to show neoteny in a specific environment and a precocious development and maturation of testis in goitrogen-treated larvae. Pituitary glands from normally...

journal_title：General and comparative endocrinology

authors： Yamaguchi M,Tanaka S,Wakahara M

更新日期：1996-12-01 00:00:00

abstract：:Under 25 degrees C and a long day photoperiod, about half of the fourth instar Psacothea hilaris larvae molt to the fifth instar on day 13 and pupate about 18 days later; the rest pupate without a further larval molt with a mean fourth instar period of 24 days. However, starvation of fourth instar larvae exceeding a t...

journal_title：General and comparative endocrinology

authors： Munyiri FN,Ishikawa Y

更新日期：2005-11-01 00:00:00

abstract：:Sex steroid hormones have been widely detected in molluscs, and experiments have shown the importance of sex steroids in sex determination, gonadal tissue maturation and gametogenesis. Nevertheless, the signaling pathways of sex steroids in invertebrates have not yet been elucidated. In order to gain insights into the...

journal_title：General and comparative endocrinology

authors： Kajiwara M,Kuraku S,Kurokawa T,Kato K,Toda S,Hirose H,Takahashi S,Shibata Y,Iguchi T,Matsumoto T,Miyata T,Miura T,Takahashi Y

更新日期：2006-09-15 00:00:00

abstract：:Using frog ovarian follicles in vitro we assessed the role of the theca/epithelium (THEP) layer and granulosa cells in the production of steroids. The THEP layer and granulosa cell-enclosed oocytes (GCEOs) were separated from ovarian follicles of the frog, Rana nigromaculata, by microdissection. Intact follicles (IFs)...

journal_title：General and comparative endocrinology

authors： Kwon HB,Ahn RS

更新日期：1994-05-01 00:00:00

abstract：:Farnesylacetone, a molecule isolated from the androgenic glands of Carcinus maenas, inhibits vitellogenesis in the ovaries. Here the effect of farnesylacetone on protein and RNA synthesis in cultured organs is described. Both leucine and uridine incorporation in ovaries were inhibited with low concentration of farnesy...

journal_title：General and comparative endocrinology

authors： Berreur-Bonnenfant J,Lawrence F

更新日期：1984-06-01 00:00:00

abstract：:In the present study, we investigated the distribution and activities of corticotropin-releasing factor (CRF) and adrenocorticotropic hormone (ACTH) immunoreactive (ir) cells in the brain and pituitary of Liza ramada during ovarian maturation, seawater acclimation, and induction of spawning. Using immunohistochemistry...

journal_title：General and comparative endocrinology

authors： Mousa SA,Mousa MA

更新日期：2006-04-01 00:00:00