Insights on the seasonal variations of reproductive features in the Eastern Atlantic Bluefin Tuna.

abstract：:Plasma levels of corticosterone and aldosterone were determined by radioimmunoassay in ducks consuming diets containing different concentrations of sodium and potassium. Compared with control diet birds, maintenance on a high-Na+ diet for 5 days caused a 2-fold increase in the basal plasma corticosterone concentration...

journal_title：General and comparative endocrinology

authors： Klingbeil CK

更新日期：1985-04-01 00:00:00

abstract：:The objective of this review was to summarize and discuss the effects of Polybrominated diphenyl ethers (PBDEs) on thyroid and reproduction systems in fish. We reviewed the evidences and mechanisms for PBDEs-induced thyroid and reproduction disruption, as well as the cross-talk between the two systems in fish. In thyr...

journal_title：General and comparative endocrinology

authors： Yu L,Han Z,Liu C

更新日期：2015-08-01 00:00:00

abstract：:The messenger RNA expression for the inhibin/activin subunits in the granulosa layer of avian follicles of different developmental stages has previously been reported. In the present study, we examined the pattern of secretion of these protein subunits from cultured granulosa cells (GC) of avian follicles of defined m...

journal_title：General and comparative endocrinology

authors： Johnson PA,Brooks CF,Davis AJ

更新日期：2005-05-01 00:00:00

abstract：:The vasoconstrictive and cardiovascular actions of a recently identified bradykinin (BK)-related peptide (Gly-Ile-Thr-Ser-Trp-Leu-Pro-Phe) from the little skate, Leucoraja erinacea were examined in the unanesthetised little skate. Intra-arterial administration of a skate BK (0.1-1 nmolkg(-1)) produced a hypertensive r...

journal_title：General and comparative endocrinology

authors： Dasiewicz PJ,Conlon JM,Anderson WG

更新日期：2011-11-01 00:00:00

abstract：:The courtship behavior of the male ring dove (Streptopelia risoria) combines aggressive displays (chasing, bowing) and nest-oriented displays (nest soliciting). Aggressive displays depend on circulating testosterone, whereas nest soliciting is estrogen-dependent and appears to depend on the aromatization of androgen i...

journal_title：General and comparative endocrinology

authors： Fusani L,Gahr M,Hutchison JB

更新日期：2001-04-01 00:00:00

abstract：:While the role of corticosterone in mediating the response of birds to acute stress is well established, it has recently been proposed that a decrease in prolactin levels following stress may complement corticosterone in redirecting resources away from breeding activities and towards behaviors promoting immediate surv...

journal_title：General and comparative endocrinology

authors： Riou S,Chastel O,Lacroix A,Hamer KC

更新日期：2010-08-01 00:00:00

abstract：:In the hypothalamus, endocannabinoids affect neuroendocrine activity by means of Gonadotropin-Releasing-Hormone-I (GnRH-I) inhibition. Since most vertebrates, human included, possess at least two GnRH molecular forms, the aim of this work was to investigate the effect of endocannabinoids on GnRH molecular forms other ...

journal_title：General and comparative endocrinology

authors： Chianese R,Ciaramella V,Fasano S,Pierantoni R,Meccariello R

更新日期：2011-09-15 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：:The ability of hormones to bind to their functional receptors on turtle (Pseudemys scripta) endocrine target tissues in the cold was tested by treating tissues with secretagogues at low temperatures (5-15 degrees) and then following subsequent target stimulation in the absence of secretagogue at a warm temperature (28...

journal_title：General and comparative endocrinology

authors： Licht P,Pavgi S,Denver RJ

更新日期：1990-12-01 00:00:00

abstract：:The importance of late winter pairing activity on the neuroendocrinology of wild waterfowl is unknown. In this study, we examined the sex-related differences in the roles of late winter pairing activity and seasonal influences on neuroendocrine and reproductive physiology in both male and female mallards. Our main goa...

journal_title：General and comparative endocrinology

authors： Bluhm CK,Rozenboim I,Silsby J,El Halawani M

更新日期：2000-05-01 00:00:00

abstract：:The asymmetrical endostyle of Branchiostoma larvae contains two different zones of mucus-producing cells which metamorphose to the paired zones 2 and 4 respectively in the endostyle of the adult. In both the larva and the adult these zones are parts of the food-trapping mechanism. An endostyle zone, which has a positi...

journal_title：General and comparative endocrinology

authors： Fredriksson G,Ericson LE,Olsson R

更新日期：1984-11-01 00:00:00

abstract：:Myopathies (Woody Breast (WB) and White Striping (WS)) of broiler chickens have been correlated with fast growth. Recent studies reported that localized hypoxia and metabolic impairment may involve in these myopathies of birds. In order to better understand the stress response mechanisms affecting myopathies of broile...

journal_title：General and comparative endocrinology

authors： Kang SW,Kidd MT Jr,Kadhim HJ,Shouse S,Orlowski SK,Hiltz J,Anthony NB,Kuenzel WJ,Kong BC

更新日期：2020-09-01 00:00:00

abstract：:In female Paratelphusa, there appear to be two alternating dominant physiological tendencies, one biased in favor of reproductive (ovarian) growth and another biased in favor of somatic (regenerative) growth. Multiple limb autotomy (MA), long known to stimulate somatic growth, did so only if the crab was physiological...

journal_title：General and comparative endocrinology

authors： Kurup KN,Adiyodi RG

更新日期：1984-12-01 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：:Potamopyrgus antipodarum is a promising test organism that is often used in ecotoxicology, both in laboratory and field exposures. As no data are available on the physiological variation range of its life-traits and the biomarkers it uses, we studied the variation of fecundity, steroid levels and energy reserves over ...

journal_title：General and comparative endocrinology

authors： Gust M,Mouthon J,Queau H,Dussart C,Buronfosse T,Garric J

更新日期：2011-06-01 00:00:00

abstract：:Two types of cDNAs (GTH-I beta and -II beta) that encode the beta subunit of goldfish gonadotropin were cloned from a goldfish pituitary cDNA library. The nucleotide sequence of GTH-I beta cDNA was 616 bp long, encoding 130 amino acids, and that of GTH-II beta was 552 bp long, encoding 140 amino acids. These two types...

journal_title：General and comparative endocrinology

authors： Yoshiura Y,Kobayashi M,Kato Y,Aida K

更新日期：1997-03-01 00:00:00

abstract：:In evolutionary endocrinology, there is a growing interest in the extent and basis of individual variation in endocrine traits, especially circulating concentrations of hormones. This is important because if targeted by selection, such individual differences present the opportunity for an evolutionary response to sele...

journal_title：General and comparative endocrinology

authors： Baugh AT,van Oers K,Dingemanse NJ,Hau M

更新日期：2014-11-01 00:00:00

abstract：:California condors released in costal sites are exposed to high levels of xenoestrogens, particularly p,p'-DDE, through scavenging of marine mammal carcasses. As a result, coastal condors carry a higher contaminant loads and experience eggshell thinning when compared to their inland counterparts. Given that condor est...

journal_title：General and comparative endocrinology

authors： Felton RG,Owen CM,Cossaboon JM,Steiner CC,Tubbs CW

更新日期：2020-04-01 00:00:00

abstract：:An androgen-binding activity has been identified in nuclear extracts of the testis of the frog, Rana esculenta. A single class of high affinity (Kd = 2.5 +/- 0.6 x 10(-9) M), low-capacity binding sites was found. The binding was specific for androgens; 17 beta-estradiol displaced [3H]testosterone with an ID50 of 0.1 m...

journal_title：General and comparative endocrinology

authors： Paolucci M,D'Antonio M,Pierantoni R

更新日期：1992-12-01 00:00:00

abstract：:Tadpoles of Rana catesbeiana at TK stages X-XII, about 9 months old, were laparotomized, and the males were implanted intraperitoneally with silastic tubes containing estradiol (E2) for various periods. Male tadpoles implanted with empty tubes served as the controls. Histology, secretions of E2, and testosterone (T) i...

journal_title：General and comparative endocrinology

authors： Chang LT,Yu NW,Hsu CY,Liu HW

更新日期：1996-06-01 00:00:00

abstract：:Insulin, glucagon, somatostatin-14, and three structurally related molecular forms of peptide tyrosine-tyrosine (PYY) were isolated from an extract of the combined pancreas and gastrointestinal tract of the pallid sturgeon, Scaphirhynchus albus. Pallid sturgeon insulin was identical to insulin from the Russian sturgeo...

journal_title：General and comparative endocrinology

authors： Kim JB,Gadsbøll V,Whittaker J,Barton BA,Conlon JM

更新日期：2000-12-01 00:00:00

abstract：:Thyroid-dependent stomach development occurs between approximately 35 and 50 days post-hatch (dph) in laboratory-reared summer flounder larvae. The process can be blocked by thiourea (TU), and TU effects are reversed by exogenous thyroxine (T4). To establish whether a window of sensitivity exists for T4-dependent gast...

journal_title：General and comparative endocrinology

authors： Soffientino B,Specker JL

更新日期：2003-12-01 00:00:00

abstract：:Gonadotropin-releasing hormone (GnRH) of vertebrates is now believed to have multiple functions in addition to its role as a hypophysiotropic hormone, as originally defined. Recently, it has been shown that GnRH occurs also in the ascidians, which are considered ancestral chordates. Here the author shows that GnRH ind...

journal_title：General and comparative endocrinology

authors： Terakado K

更新日期：2001-12-01 00:00:00

abstract：:This experiment was performed on two groups of male Japanese quail. One had been maintained in our laboratory as a closed colony (S-group), and the other had been obtained from a commercial source (R-group). Different responses of gonadal function were found between two groups following either testosterone treatment o...

journal_title：General and comparative endocrinology

authors： Konishi H,Wada M,Homma K

更新日期：1985-09-01 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：:Reproductive maturation and regulation is centrally orchestrated by gonadotropin-releasing hormone (GnRH). GnRH produced in the vertebrate hypothalamus acts on the pituitary to regulate gonadotropins. In nonplacental mammalian species, it has recently been shown that a second GnRH gene is expressed in mesencephalic ce...

journal_title：General and comparative endocrinology

authors： Kasten TL,White SA,Norton TT,Bond CT,Adelman JP,Fernald RD

更新日期：1996-10-01 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 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：:We investigated the seasonal and daily variation in plasma glucose levels in response to stress in captive wild starlings. Starlings were captured from the wild during the winter, held on short days (11L:13D, mimicking winter), and then shifted to long days (19L:5D, mimicking summer). Birds were maintained on long day...

journal_title：General and comparative endocrinology

authors： Remage-Healey L,Romero LM

更新日期：2000-07-01 00:00:00

abstract：:A radioimmunoassay (RIA) was developed to measure cortisone in Atlantic salmon plasma. Diatomaceous earth microcolumn chromatography was used to separate the cortisone from other steroids. The RIA method following chromatography was validated by analyzing each of six samples of blood by double isotope derivative assay...

journal_title：General and comparative endocrinology

authors： Weisbart M,McGowan LK

更新日期：1984-09-01 00:00:00