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| Registros recuperados: 51 | |
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| Guimarães,Diva Anelie; Cardoso,Deise de Lima; Ferreira,Maria Auxiliadora Pantoja; Albuquerque,Natália Inagaki de. |
| Biological studies are necessary for the management of wildlife in captivity, and knowledge of reproduction is one of the important features for increasing production. The objective of the research was to determine the age at which male collared peccaries reach puberty. Testicular samples of 15 animals, aged 7 to 16 months, distributed into five groups (G1, G2, G3, G4 and G5) were used. The testes showed considerably increased weight, length and width (p < 0.05) from G1 to G3, whereas, from this group onward, the development of this organ was slower. There was positive correlation (p < 0.001) between the following testicular parameters: weight and length (r = 0.97), weight and width (r = 0.88), length and width (r = 0.92). Regarding the diameter of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reproduction; Testicles; Spermatogenesis; Tayassuidae. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000100012 |
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| Castro,A.C.S.; Queiroz,G.F.; Nogueira,J.C.; Coimbra,C.C.; Reis,A.M.; Marubayashi,U.; Yamasaki,K.. |
| The objectives of this study were to evaluate the effects of pinealectomy, adrenalectomy and pinealectomy-adrenalectomy upon the quantification of spermatogenic cells of rats. As such, 32 adult Wistar rats with a mean body weight of 331.7± 15.5g were assigned into one of the following treatments: (a) a sham-operated control group, consisting of nine animals; (b) ten pinealectomized animals; (c) seven adrenalectomized animals and (d) six pinealectomized plus adrenalectomized animals. No significant differences were observed between groups for the following parameters: body, testes, prostate and seminal vesicle weights, seminiferous tubular diameter, number of cells per seminiferous tubular cross sections (primary spermatocytes at pachytene, round... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spermatogenesis; Pinealectomy; Adrenalectomy; Rat. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352002000300008 |
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| Ferreira,Adelina; Mehanna,Mahmoud; Prado,Cynthia P. A.. |
| The spermatogenesis of Pseudis limellum, from the Southern Pantanal, Brazil, was studied from July 1995 to May 1996, through histological sections of the testis. The cells could be differentiated as: primary spermatogonia, large cells, generally with bilobed nucleus; secondary spermatogonia, smaller cells, with darker cytoplasm, chromatin of radial form; primary and secondary spermatocytes, differentiated according to the different stages of the nucleus during the successive cells divisions. Furthermore, we observed cells in process of morphologic differentiation: rounded spermatids much smaller, with nucleus containing chromatin in compacting process and cytoplasm reduction; elongated spermatids, generally parallel organized in well defined bundles, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spermatogenesis; Male; Amphibia; Climatic influences. |
| Ano: 2008 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000200004 |
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| Contreras,H.R.; Paredes,V.; Urquieta,B.; Del Valle,L.; Bustos-Obregón,E.. |
| ParathionÒ 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 ParathionÒ, 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 ParathionÒ, 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 spermatids. The plasma testosterone was assayed by standard radioimmunoanalysis. The same... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Steroidogenesis; Spermatogenesis; Pesticide; ParathionÒ. |
| Ano: 2006 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000300002 |
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| Ferreira,Adelina; Dolder,Heidi. |
| 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 pro-acrosomal 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 beginning of cellular elongation. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ultrastructure; Sperm; Spermatogenesis; Lizard; Tropiduridae. |
| Ano: 2003 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300006 |
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| Lagos-Cabré,Raúl; Moreno,Ricardo D. |
| Bisphenol A [2,2-bis(4-hydroxyphenyl)propane] (BPA), 4-nonylphenol (NP) and di(2-ethylhexyl)phthalate (DEHP), and its metabolite mono-2-ethylhexyl phthalate (MEHP) are chemicals found in plastics, which act as endocrine disruptors (EDs) in animals, including human. EDs act like hormones in the endocrine system, and disrupt the physiologic function of endogenous hormones. Most people are exposed to different endocrine disruptors and concern has been raised about their true effect on reproductive organs. In the testis, they seem to preferentially attack developing testis during puberty rather than adult organs. However, the lack of information about the molecular mechanism, and the apparently controversial effect observed in different models has hampered the... |
| Tipo: Journal article |
Palavras-chave: Testis; Spermatogenesis; Bisphenol A; Nonylphenol; ADAM17. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100001 |
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| Carlos,Jaqueline; Matta,Sérgio Luis Pinto da. |
| The aim of this work was to study the testicular morphometry of captivity-bred adult bullfrogs. Fifteen young adult male were studied, in the rainy season and a lengthy photoperiod. The GSI was established at 0.15%. The nuclear diameter of germinative and Leydig cells, the nucleolus diameter of Sertoli cells and the area of cysts and tubules were determined and the mean number of ISPC, IISPC and SPT per cyst and the mean number of cysts per tubule was estimated. The nucleoplasmatic proportion of the nucleus of the Leydig cell was 76.22%, indicating less cytoplasmic activity. Eight generations of spermatogonia were found. The spermatogenesis efficiency in meiosis and in mitosis was 63 and 49%, respectively. The spermatogenesis of bullfrog fited in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spermatogenesis; Sertoli; Leydig; GSI. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600018 |
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| Oliveira,Nelma Neylanne Pinho Muniz; Félix,Matheus Augusto Rodrigues; Pereira,Tauany Costa Silva; Rocha,Luiz Gustavo Pessoa; Miranda,José Rafael; Zangeronimo,Márcio Gilberto; Pinto,José Eduardo Brasil Pereira; Bertolucci,Suzan Kelly Vilela; Sousa,Raimundo Vicente de. |
| ABSTRACT The aim of this study was to assess the sperm quality and testicular histomorphometry of Wistar rats supplemented with extract and fractions of fruits of Tribulus terrestris L. The ethanolic extract was obtained by dynamic maceration of spray-dried fruit. This extract was fractionated by liquid-liquid partition, using increasing polarity solvents. Twenty male rats were separated in four groups, with five rats in each group. The control was supplemented with distilled water, while the others were daily given the ethanolic extract, hexanic or aqueous fraction soluble in methanol in a dose of 42 mg.kg-1.day-1 for 70 days. Sperm was obtained from the right epididymal tail for the analysis of motility, count, morphology and viability. The testicular... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vegetal extract; Spermatogenesis; Leydig cells. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000600891 |
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| Freitas,Karine Moura de; Costa,Kyvia Lugate; Campos,Pamela Kelly Araújo; Melo,Fabiana Cristina Silveira Alves de; Paula,Tarcízio Antônio Rego de; Matta,Sérgio Luis Pinto da. |
| The aim of this study was to evaluate the possible beneficial effects of Catuaba Cristal® (CC), an alcoholic drink made from wine and Erythroxylum catuaba Ar. Cam on testis. Wistar rats either received CC solution (n=8) or water (n=9). Results showed significant body weight reduction within the CC group, although, no weight changes were observed for liver, kidney, testis, epididymis, seminal vesicle and prostate. The volumetric proportion and volume of interstitial tissue and lymphatic space were reduced in the treated group. In the CC group, although the nuclear volume of Leydig cells (LC) decreased, the number of LC per testis increased. These results suggested that CC had no beneficial effect on spermatogenesis of Wistar rats. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aphrodisiac drink; Medicinal plants; Morphometry; Spermatogenesis; Testis. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500007 |
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| Registros recuperados: 51 | |
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