Sperm Cell
Mostrando 25-36 de 323 artigos, teses e dissertações.
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25. Radio frequency electromagnetic radiation (RF-EMR) from GSM (0.9/1.8GHz) mobile phones induces oxidative stress and reduces sperm motility in rats
INTRODUCTION: Mobile phones have become indispensable in the daily lives of men and women around the globe. As cell phone use has become more widespread, concerns have mounted regarding the potentially harmful effects of RF-EMR from these devices. OBJECTIVE: The present study was designed to evaluate the effects of RF-EMR from mobile phones on free radical m
Clinics. Publicado em: 2009-06
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26. Effects of the conditioned medium of mesenchymal stem cells on mouse oocyte activation and development
Mesenchymal stem cells (MSCs) have been reported to secrete a variety of cytokines and growth factors acting as trophic suppliers, but little is known regarding the effects of conditioned medium (CM) of MSCs isolated from femurs and tibias of mouse on the artificial activation of mouse oocytes and on the developmental competence of the parthenotes. In the cu
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-06
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27. Genotoxicity assessment of a pharmaceutical effluent using four bioassays
Pharmaceutical industries are among the major contributors to industrial waste. Their effluents when wrongly handled and disposed of endanger both human and environmental health. In this study, we investigated the potential genotoxicity of a pharmaceutical effluent, by using the Allium cepa, mouse- sperm morphology, bone marrow chromosome aberration (CA) and
Genetics and Molecular Biology. Publicado em: 2009
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28. 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
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29. Criopreservação de espermatozóides eqüinos comparando duas curvas de congelamento combinadas com diluentes comerciais: uma análise laboratorial / Cryopreservation of equine spermatozoa comparing different freezing rates combined with comercial extenders: laboratorial analysis
Durante o processo de criopreservação de sêmen, os espermatozóides sofrem alguns danos que resultam na diminuição da fertilidade deste. O presente estudo foi realizado a fim de avaliar o efeito da utilização, combinada de duas curvas de congelamento com dois diluentes comerciais sobre a criopreservação de sêmen eqüino. Foram analisados 20 ejacula
Publicado em: 2009
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30. Influência da distrofia muscular do Golden Retriever (GRMD) na viabilidade espermática e nas características morfológicas do aparelho reprodutivo masculino / Influence of Golden Retriever muscular dystrophy (GRMD) on sperm viability and on morphologic characteristics of the male reproductive tract
Muscular dystrophies constitute a group of diseases characterized by progressive and irreversible muscle degeneration. Duchenne´s Muscular Dystrophy (DMD) is a lethal myopathy caused by dystrophin deficiency, a muscular cell cytoskeleton protein. The dystrophin gene have recessive characteristic and is located in the p21 portion of the X chromosome. Advance
Publicado em: 2009
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31. Genic transfer in sperm cells in Mus musculus and Ramdia quelem / Transferência gênica em células espermáticas de Mus musculus e Ramdia quelen
Transgenic animals have been used as biological models in studies of the genes functions and their mechanisms of action, as well as to improve animal production. Researchers are trying to produce transgenic animals that will be organs donors in xenotransplants. Another use of the transgenic animal is in the production of recombinant proteins for pharmaceutic
Publicado em: 2009
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32. Study of the Alterations in Reproductive System of Mice Exposed to Environmental Contamination / Estudo das alterações no sistema reprodutor de camundongos expostos a contaminação ambiental
The Atmospheric Pollution Laboratory of The Sao Paulo University Medical College develops research on the effects of environmental pollution in health. This study investigated the effects on the reproductive system of balb-c mice exposed to water from a river near a deactivated waste depositary. Eighty male mice were separated in four groups: Group A (minera
Publicado em: 2008
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33. Análise morfológica das espermátides e dos espermatozóides de Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae) nos tratos reprodutores
Diptera constitutes one of the four largest orders of insects. The Oriental latrine-fly Chrysomya megacephala (Fabricius) belongs to the family Calliphoridae and is associated with medic, veterinary, sanitary and forensic issues. The aim of this research was to characterize the utrastructural aspects of the spermiogenesis and spermatozoa of the C. megacephal
Publicado em: 2008
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34. Chromatin supraorganization and extensibility, and nuclear composition in mouse cells / Supraorganização e extensibilidade da cromatina, e composição nuclear em celulas de camundongo
Aging may be defined as the changes that take place in an organism with time. This process, in biology, is called senescence. Cellular senescence is observed in isolated cells, and has been studied typically in cultured cells, but its occurrence in vivo has been shown only in some mammalian tissues. Chromatin changes that take place with cellular senescence
Publicado em: 2008
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35. 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
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36. In silico characterization and epigenetic analysis of in vivo and cloned cattle of the homologue region 11p15.5 involved with Beckwith-Wiedemann syndrome in humans / Caracterização in silico e análise epigenética em bovinos produzidos in vivo e por transferência nuclear da região homóloga à 11p15.5 envolvida com a síndrome de Beckwith-Wiedemann em humanos
Epigenetics is the branch of biology which studies heritable changes in genome function that occur without a change in nucleotide sequence within the DNA. One of the most studied epigenetic process is the DNA methylation, which is associated with several gene regulation mechanisms such as genomic imprinting. This type of regulation is characterized by parent
Publicado em: 2007