C. GAMARRA-LUQUES, B.C. WINIK, I.A. VEGA, E.A. ALBRECHT, N.M. CATALAN, A. CASTRO-VAZQUEZ

BIOCELL, Vol.30, Suppl.S, pp. 345-357, 2006

Abstract This article has no abstract. More >

H.R. CONTRERAS¹, V. PAREDES¹, B. URQUIETA², L. DEL VALLE⁴, E. BUSTOS-OBREGÓN³

BIOCELL, Vol.30, No.3, pp. 423-429, 2006, DOI:10.32604/biocell.2006.30.423

Abstract Parathion® is an organophosphorate pesticide amply used in agriculture. Many alterations induced by organophosphorate pesticides have been described, such as: cytogenetic alterations in germinal cells, oligozoospermia and teratozoospermia in the mouse. The effect of Parathion®, both pure (PP) and commercial (PC), on mouse interstitial cell testosterone production was evaluated in vivo and in vitro. Male mice were intraperitoneally injected with a single dose of 1/3 LD50 of Parathion®, both PP and PC. The animals were sacrificed at 1, 8 and 40 days post injection to evaluate the impact of disrupting testosterone production on spermatogonia, spermatocytes and elongated… More >

ADELINA FERREIRA, HEIDI DOLDER

BIOCELL, Vol.27, No.3, pp. 353-362, 2003, DOI:10.32604/biocell.2003.27.353

Abstract Spermatogenesis, with emphasis on spermiogenesis, is described for the lizard, Tropidurus itambere, using light microscopy, phase contrast and epifluorescence, as well as scanning and transmission electron microscopy. Cellular differentiation involves events of chromatin condensation, nuclear elongation and the formation of structural complexes, such as the acrosomal and axonemal ones. Other new characteristics, exclusive for this species, include various aspects of the subacrosomal granule, the insertion of the proacrosomal vesicle and the development of these structures to participate in the acrosomal complex. Radial projections occur just above the nuclear shoulders, which have been recognized already from the More >

CARMINDA DA CRUZ-LANDIM*, FÁBIO CAMARGO ABDALLA*, MARIA ALICE DA CRUZ-HÖFLING**

BIOCELL, Vol.27, No.3, pp. 319-328, 2003, DOI:10.32604/biocell.2003.27.319

Abstract The spermatogenesis of Piaractus mesopotamicus was investigated under light and transmission electron microscopy. The specimens were captured from their natural environment (Rio Miranda and Rio Aquidauana, Pantanal Matogrossense, Brazil) during April and September. The results were compared with the spermatogenic data of specimens under captivity condition. In both conditions, P. mesopotamicus presented the typical spermatogenesis pattern of the teleost fishes, showing no significative differences. The spermatozoon was classified as type I, which has a globular head without acrosome, a short middle piece and a long tail constituted only by the flagellum. This type of spermatozoon is considered More >