Results 1 to 10 of about 21,199 (260)

The endocrine regulation of gametogenesis and gonad maturation in fishes

General and Comparative Endocrinology, 1972
Abstract The gonads of fishes, like those of all other vertebrates, contain germinal and endocrine tissue, and both components require the support of hormones if they are to develop and function normally. The steroid-secreting tissues invariably need hormonal stimulation but the situation relating to gametogenesis is more variable.
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Influence of melatonin on gonad maturation inLineus lacteus (Heteronemertini, Lineidae)

The Journal of Experimental Zoology, 1996
The annual reproductive cycle of Lineus lacteus is regulated by photoperiod and thermoperiod. Gonad maturation depends on a gonad-inhibiting hormone (GIH) secreted by the cerebral ganglia, in which melatonin was also observed. Results in the worm showed that melatonin concentrations seemed to vary at the two most appropriate times of the year (spawning
Fabrice Arnoult, Guy Vernet
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Functional maturation of the pituitary-gonadal axis in the neonatal female rat

Biology of Reproduction, 1995
The development onset of the pituitary feedback response to LH/hCG-stimulated ovarian activity was studied in the neonatal rat. A single injection of hCG (600 IU/kg BW) was administered to groups of rats between 1 and 10 days of age, and the responses, i.e., ovarian estradiol (E2), progesterone (P), and testosterone (T) production as well as serum LH ...
T A, Sokka, I T, Huhtaniemi
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[The role of the gonads in the maturation of corticotropic function in rats].

Comptes rendus hebdomadaires des seances de l'Academie des sciences. Serie D: Sciences naturelles, 1975
The rates of pituitary and adrenals growth, in male and female Rats, are reversed at puberty. It seems that the stress induced plasma corticosterone increase is inhibited by testis before puberty and stimulated by ovarian after puberty.
J, Maniey, G, Lescoat, J, Lanoe, P, Rochcongar, A M, Drouet   +4 more
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Gonadal sex differentiation in Eleutheronema tetradactylum: Histological features and transcriptomic insights from mature gonads

Comparative Biochemistry and Physiology Part D: Genomics and Proteomics
Plasticity in teleosts is a fascinating evolutionary strategy enables species to acclimate to environmental changes. However, the molecular mechanisms that underlie gonadal differentiation and reversal remain incompletely understood. The four-finger threadfin (Eleutheronema tetradactylum), a protandrous hermaphrodite belonging to the Polynemidae family,
Evodia Moses, Mkulo, Lukman, Iddrisu, Salifu, Ibrahim, Jiansheng, Huang, Linjuan, Wang, Anna, Zheng, Happiness Moses, Mwemi, Jin, Minxuan, Huijuan, Zhang, Baogui, Tang, Qian, Ma, Kwaku, Amoah, Bei, Wang, Zhongliang, Wang   +13 more
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Artificial Induction of Conditioning (Gonad Maturation)

2021
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Patterns of maturation, gonad maturity gradation and cycle of maturation of Pacific cod (Gadus macrocephalus)

The researches of the aquatic biological resources of Kamchatka and of the north-west part of the Pacific Ocean, 2016
Nadezhda P. Sergeeva, Alexander I. Varkentin   +1 more
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Thermal Stress Affects Gonadal Maturation by Regulating GnRH, GnRH Receptor, APGWamide, and Serotonin Receptor Gene Expression in Male Pacific Abalone, Haliotis discus hannai During Breeding Season

Frontiers in Marine Science, 2021
Kang Hee Kho, Zahid Parvez Sukhan, Yusin Cho   +2 more
exaly  

Gonadal Maturation and Maturity Staging of the Pacific Sand Lanсe Ammodytes personatus (Ammodytidae)

Journal of Ichthyology, 2022
K. A. Zhukova, M. R. Baker
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Photoperiodic effects on somatic growth and gonadal maturation in Mickey Mouse platy, Xiphophorus maculatus (Gunther, 1866)

Fish Physiology and Biochemistry, 2020
Bela Zutshi
exaly