|
|
|
|
|
| Fernandes Boaro Martins,Márcia Regina; Carvalho Pinto e Silva,José Ricardo de. |
| The objective of this study was to describe some changes in spermatids differentiating events during spermiogenesis, leading to spermatozoa final formation. The animals were sacrificed with ethylic acid inhalation and, then, testis fragments were collected, fixed in Karnovsky and post-fixed in osmium tetroxide. After dehydration, the sections were stained with uranyl acetate 2%. It was observed in early spermatids at Golgi phase, formation of acrosomal granule contained in the acrosomal vesicle, spheroidal nucleus with rugous reticulum around it, and Golgi apparatus made up of lamellae and vesicular structures. At cephalic hood phase, the granule suffers flattening and the marginal fossa is formed. In both phases, it was possible to observe the presence of... |
| Tipo: Journal article |
Palavras-chave: Spermiogenesis; Spermatids; Mice. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400007 |
| |
|
|
| Chaves,Marcio F.; Moura,Geraldo J.B. de; Tenório,Fernanda das C.M.A.; Baptista,Josemberg da S.; Lapa Neto,Clovis J.C.; Texeira,Valeria W.; Texeira,Álvaro A.C.. |
| ABSTRACT In the semi-arid environment, the reproductive success of anurans depends on adaptations in their life cycle, which synchronizes with ideal environmental conditions to maximize the number of offspring. In this study changes in the histological and morphometric aspects of the testes of Leptodactylus macrosternum Miranda-Ribeiro, 1926 are characterized, to evaluate the influence of rainfall and temperature on them. Specimens were collected at Horto Florestal Olho d’Água da Bica - HFOB (06°49’20”S, 36°15’85”W) area, municipality of Cuité, state of Paraíba, Brazil. Search for specimens was active, happened at night, and amounted to 15 days from January to December 2013. The densities of spermatids (primary and secondary), sperm and area of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anuran; Semi-arid; Spermatids; Spermatozoa. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100329 |
| |
|
|
|
