Buscar
Mostrando ítems 441-450 de 727
Cambios histomorfológicos en los testes del capitan, eremophilus mutisii (trichomycteridae, siluriformes), durante el ciclo reproductivo anual en el sistema del rio bogotá en colombia
(Caldasia, 1986)
The main purpose of this research is to establish the annual morphohistological changes in the testes of the fish Eremophilus mutisii in the río Bogotá basin in Colombia. Spent testes appear in early May, and the ...
Synergistic effect of the hydroalcoholic extract from Lepidium meyenii (Brassicaceae) and Fagara tessmannii (Rutaceae) on male sexual organs and hormone level in rats
(Medknow Publications, 2014)
Background: Lepidium meyenii is a plant, which has been used in folk medicine to treat infertility and to increase sexual desire. However, few reports have investigated the administration of this plant with other plants ...
Testis structure, spermatogonial niche and Sertoli cell efficiency in Neotropical fish
(2019-03-01)
Neotropical icthyofauna represents one of the most diverse and extreme ecosystems in the world. Likewise, reproduction showed enormous diversity with different reproductive systems, modes and behavior. On the other hand, ...
Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
(Sociedade Brasileira de Ictiologia, 2014-04-01)
Spermiogenesis and spermatozoa in six genera of the African family Alestidae plus the Neotropical genus Chalceus are described. Spermiogenesis is quite similar in all Alestidae and is identified as Type I and its variants. ...
Ciclo reprodutivo sazonal e variabilidade em níveis de testosterona no pato doméstico (Anas platyrhynchos)
(2017-01-01)
Morphofunctional gonadal alterations constitute an annual cycle in birds during which four phases can be distinguished in the testes based on histological modifications in the seminiferous epithelium, called quiescence, ...
Intraspecific chromosome polymorphisms can lead to reproductive isolation and speciation: an example in red brocket deer (Mazama americana)
(Oxford Univ Press Inc, 2017-06-01)
The red brocket (Mazama americana) is a South American deer with a wide geographical distribution that presents different chromosomal variants depending on their location. At least six different cytotypes belonging to two ...
Fluoxetine-induced androgenic failure impairs the seminiferous tubules integrity and increases ubiquitin carboxyl-terminal hydrolase L1 (UCHL1): Possible androgenic control of UCHL1 in germ cell death?
(Elsevier B.V., 2019-01-01)
The selective serotonin reuptake inhibitor fluoxetine has been used for the treatment of depression. Although sexual disorders have been reported in male patients, few studies have demonstrated the fluoxetine effect on the ...
Duration of spermatogenesis and identification of spermatogonial stem cell markers in a Neotropical catfish, Jundia (Rhamdia quelen)
(Elsevier B.V., 2019-03-01)
Spermatogenesis is a process driven by stem cell, where germ cell cycle is under the control of a specific genotype species. Considering that Jundia. (Rhamdia quelen) is a Neotropical catfish with great economical importance ...
Glycoprotein hormone receptor knockdown leads to reduced reproductive success in male Aedes aegypti
(2019-01-01)
Glycoprotein hormone receptors mediate a diverse range of physiological functions in vertebrate and invertebrate organisms. The heterodimeric glycoprotein hormone GPA2/GPB5 and its receptor LGR1, constitute a recently ...
Ascorbic acid supplementation ameliorates testicular hormonal signaling, sperm production and oxidative stress in male rats exposed to rosuvastatin during pre-puberty
(2019-02-01)
Dyslipidemias are occurring earlier in the population due to the augmentation of obesity. Rosuvastatin reduces cholesterol and triglycerides; however, previous studies have shown that it may affect male reproduction. ...