Acrosome Reaction
Mostrando 1-12 de 51 artigos, teses e dissertações.
-
1. SUPLEMENTAÇÃO DE SELÊNIO NA DIETA E QUALIDADE ESPERMÁTICA DO SÊMEN DE TOUROS BRANGUS
Resumo Objetivou-se avaliar a qualidade espermática do sêmen de touros suplementados com selênio (Se) na dieta. Foram utilizados 16 touros Brangus, igualmente distribuídos em grupo controle (GC) e grupo Se (GSe − 0,1mg de Se/kg de MS de dieta). O experimento teve duração de 75 dias, e os animais foram suplementados por 60 dias. Foram realizadas quatr
Ciênc. anim. bras.. Publicado em: 10/06/2019
-
2. Actiflagelin, a new sperm activator isolated from Walterinnesia aegyptia venom using phenotypic screening
Abstract Background Sperm contains a wealth of cell surface receptors and ion channels that are required for most of its basic functions such as motility and acrosome reaction. Conversely, animal venoms are enriched in bioactive compounds that primarily target those ion channels and cell surface receptors. We hypothesized, therefore, that animal venoms shou
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 22/02/2018
-
3. Sperm and Egg Jelly Coat from Sea Urchin Lytechinus variegatus Collected in Rio de Janeiro Contain Distinct Sialic Acid-Rich Polysaccharides
This work found the occurrence of a distinct sialic acid-rich polysaccharide in the sperm surface of the sea urchin Lytechinus variegatus, which differed significantly from a similar molecule found in the egg jelly. The sperm polysaccharide extracted by protease digestion was purified using anion exchange chromatography and characterized using agarose gel el
Braz. arch. biol. technol.. Publicado em: 2015-08
-
4. Levonorgestrel como contraceptivo de emergência e sua influência sobre algumas funções espermáticas / Levonorgestrel as emergency contraceptive and its influence upon some sperm functions
O mecanismo de ação do levonorgestrel (LNG) na anticoncepção de emergência (AE) ainda não está totalmente esclarecido e seu efeito nas funções espermáticas também não está explicado. Os objetivos deste trabalho foram avaliar se o LNG, em dose igual à observada após a ingestão oral para AE, poderia afetar espermatozoides expostos in vitro à t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2011
-
5. Desvio de segregação em humanos / Segregation distortion in humans
The transmission ratio distortion (TRD), a biological process defined as a deviation from Mendelian predictions, is caused by different mechanisms: nonrandom segregation of chromosomes during meiosis or gametic and postzygotic viability selection. In order to investigate TRD in humans, we have studied a family with an overtransmitted pathogenic deletion in t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
-
6. Measurement of sperm capacitation and acrosome reaction. like changes by chlortetracycline test (CTC) can predict the freezability of ram semen?
2008
Reproduction in Domestic Animals. Publicado em: 2011
-
7. Peritoneal fluid modulates the sperm acrosomal exocytosis induced by N-acetylglucosaminyl neolycoprotein
The effect of peritoneal fluid (PF) on the human sperm acrosome reaction (AR) was tested. Sperm was pre-incubated with PF and the AR was induced by calcium ionophore A23187 and a neoglycoprotein bearing N-acetylglycosamine residues (NGP). The AR induced by calcium ionophore was inhibited 40% by PF from controls (PFc) and 50% by PF from the endometriosis (PFe
Publicado em: 2010
-
8. Efeito da varicocele na função dos espermatozóides. / Effect of varicocele on sperm function.
Objectives: to assess the effect of varicocele on sperm nuclear DNA integrity, mitochondrial activity, lipid peroxidation and acrosome integrity. Methods: semen samples were obtained and analyzed according to the World Health Organization guidelines (1999) and sperm morphology was evaluated by Krugers strict criteria (1986). The study group included 30 men w
Publicado em: 2009
-
9. Capacitation-like changes in bovine semen after cryopreservation using extenders within egg yolk or soy lecithin / Alterações semelhantes à capacitação no sêmen bovino após a criopreservação utilizando diluidores a base de gema de ovo ou lecitina de soja
O objetivo deste estudo foi avaliar os efeitos de três diluidores diferentes na criopreservação do sêmen bovino sobre a motilidade, hiperativação espermática, reação acrossomal, capacitação e peroxidação lipídica das membranas espermáticas. Foram realizadas seis colheitas de sêmen em intervalos quinzenais de dez touros zebuínos da raça Nelo
Publicado em: 2009
-
10. AvaliaÃÃo da presenÃa de PapilomavÃrus bovino em sÃmen de touros (Bos taurus)
Papillomaviruses (PV) are viruses that contain double strand DNA and can infect the squamous epithellium of the skin and mucosa. There are 10 different types of BPV (BPV-1 to 10) and they can cause serious diseases in dairy herds or cutting, creating great economic losses to farmers in Brazil and other countries. The presence of BPV has been detected in repr
Publicado em: 2009
-
11. Effects of pentoxifylline treatment before freezing on motility, viability and acrosome status of poor quality human spermatozoa cryopreserved by the liquid nitrogen vapor method
The objective of the present study was to investigate the effects of the direct addition of pentoxifylline (PF) to the ejaculates of men with poor sperm quality before freezing on post-thaw sperm motility, viability, acrosome integrity, and agonist-induced acrosome reaction. Semen specimens from 16 infertile men with impaired sperm count and motility (oligoa
Brazilian Journal of Medical and Biological Research. Publicado em: 04/06/2007
-
12. A carbohydrate-based mechanism of species recognition in sea urchin fertilization
In the present review, we describe a systematic study of the sulfated polysaccharides from marine invertebrates, which led to the discovery of a carbohydrate-based mechanism of sperm-egg recognition during sea urchin fertilization. We have described unique polymers present in these organisms, especially sulfated fucose-rich compounds found in the egg jelly c
Brazilian Journal of Medical and Biological Research. Publicado em: 2007-01