Now showing items 31-40 of 973
Ultrastructure of Spermatogenesis in the Short-Tailed Fruit Bat, Carollia perspicillata ( Chiroptera: Phyllostomidae: Carollinae)
Among species of the Chiroptera, spermatogenesis and the fully differentiated spermatozoa differ in morphological and ultrastructural detail. This study therefore aimed to ultrastructurally characterize the spermatogenesis ...
Relationship between the nucleolar cycle and chromatoid body formation in the spermatogenesis of Phrynops geoffroanus (Reptilia Testudines)
(Taylor & Francis Ltd, 2012-04-01)
The nucleolus is a distinct nuclear territory involved in the compartmentalization of nuclear functions. There is some evidence of a relationship between nuclear fragmentation during spermatogenesis and chromatoid body ...
Ultrastructure of spermatogenesis in the white-lined broad-nosed bat, Platyrrhinus lineatus (Chiroptera: Phyllostomidae)
(Pergamon-Elsevier B.V. Ltd, 2011-08-01)
Spermatogenesis, the remarkable process of morphological and biochemical transformation and cell division of diploid stem cells into haploid elongated spermatozoa, is one of the most complex cell differentiations found in ...
Duration of spermatogenesis in the bullfrog (Lithobates catesbeianus)
(Elsevier B.V., 2009-10-15)
The bullfrog (Lithobates catesbeianus) has substantial economic importance and has also been used as an experimental model for biological studies in the fields of pharmcology, medicine, and reproductive biology, especially ...
Spermatogenesis of riffle bugs, Rhagovelia whitei and Rhagovelia sp (Veliidae), and backswimmers Martarega sp (Notonectidae).
We examined the course of spermatogenesis and the meiotic chromosome complements in aquatic species of true bugs, Heteroptera. The chromosome complement of the Veliidae species was 2n = 39 (38A + X0) and 23 (22A + X0) in ...
Alterations of spermatogenesis in etoposide-treated rats: A stereological study
The etoposide is an anticancer drug that interacts with topoisomerase II. Thirty-day-old rats received intraperitonially 2mg/kg of etoposide for 30 consecutive days. Their testes were analyzed in the adult phase under light ...