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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 61 (0.082 seconds)Spelling suggestions: "subject:"speed motility""
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The interaction of human spermatozoa with secretions of the human female reproductive tract : an in vitro approachZhu, Jian Jun January 1995 (has links)
No description available.
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The assessment of sperm motility by photon correlation spectroscopyTraub, A. I. January 1980 (has links)
No description available.
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Studies on the acquisition, expression and disruption of mammalian sperm motilityWhite, David Robert January 1987 (has links)
No description available.
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The effects of pentoxifylline on human sperm functionMcKinney, Karen Aileen January 1996 (has links)
No description available.
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Perspectives on the biological role of human prostasomes /Carlsson, Lena, January 2001 (has links)
Diss. (sammanfattning) Uppsala : Univ., 2001. / Härtill 5 uppsatser.
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Mechanical activity and its propagation along the flagellar axoneme : studies using caged ATPVernon, Geraint Grrffydd January 1996 (has links)
No description available.
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Origin and effects of reactive oxygen species (ROS) in human sperm suspensionsWhittington, Kate January 1997 (has links)
No description available.
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Functional expression of sperm Ca²⁽-activated K⁽ channels in xenopus oocytes and their modulations by Ca²⁽-evoking agonists. / CUHK electronic theses & dissertations collectionJanuary 2000 (has links)
by So Siu Cheung, Eddie. / "September 2000." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2000. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
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Aspects of the reproduction of male and female African penguins (Spheniscus demersus) with special reference to sperm biology and cryopreservationMafunda, Patrick Siyambulela January 2018 (has links)
Philosophiae Doctor - PhD / In the marine environment, penguins have been described as curators and serve a critical role in ecological balance. The African penguin (Spheniscus demersus) has undergone a rapid population decline, mainly due to disturbances in their natural habitat. The African penguin was up-listed from vulnerable to endangered on the IUCN Red List for Threatened Species in 2010 and thus urgent conservation action is required. Integral to long-term conservation action of any species is a basic knowledge of its reproductive biology, which is currently lacking for African penguins. The main aim of this investigation was to evaluate techniques for the collection of semen in African penguin and to determine sperm quality in order to cryopreserve sperm for in vitro fertilization (IVF) purposes of captive and wild populations. Semen was collected once a week during two breeding seasons from two captive African penguins. Ejaculates (n=51) were obtained over two breeding seasons (Jan-Feb and Jun-Oct) and evaluated for semen volume, sperm concentration, sperm vitality, sperm motility and sperm morphology. In addition twelve (six females and six males, n=4 were breeding pairs) captive African penguins were monitored for hormone (estradiol, testosterone, progesterone) levels prior to and after the egg-laying period.
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Alterações celulares e moleculares induzidas pelo choque térmico em espermatozoides bovinosSilva, Daniela Franco da January 2017 (has links)
Orientador: Fabíola Freitas de Paula Lopes / Resumo: A função do espermatozoide pode ser comprometida por condições ambientais adversas. Estudos já demonstraram que a exposição in vivo e in vitro de espermatozoides bovinos a temperatura elevada induz a morte celular, reduz a motilidade espermática e o potencial fertilizante do espermatozoide. No entanto, as alterações celulares induzidas pelo choque térmico em espermatozoides bovinos ainda são controversas. Portanto, o objetivo deste estudo foi determinar o efeito do choque térmico em espermatozoides de touros holandeses na motilidade espermática, produção de espécies reativas de oxigênio (EROs), atividade mitocondrial, atividade de caspase, potencial de fertilização, cinética e desenvolvimento embrionário pré-implantacional. As amostras de sêmen foram descongeladas e submetidas ao gradiente de Percoll. Na amostra controle (sem incubação) os espermatozoides foram avaliados imediatamente após o gradiente de Percoll. Posteriormente, as amostras foram incubadas à 35 °C (Controle da temperatura testicular), 38,5 °C (temperatura corporal) e 41 °C (choque térmico) por 4 horas. O choque térmico de 41 °C reduziu a motilidade espermática após 2 h de incubação em comparação com 35 e 38,5 °C. A exposição de espermatozoides a diferentes temperaturas aumentou a produção de EROs, sendo este efeito mais acentuado no grupo 41°C em relação aos demais tratamentos. O aumento das EROs em espermatozoides submetidos ao choque térmico foi seguido da redução na atividade mitocondrial espermática e au... (Resumo completo, clicar acesso eletrônico abaixo) / Doutor
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