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  • About
  • 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.
1

CriopreservaÃÃo de sÃmen humano-comparaÃÃo entre mÃtodo de congelaÃÃo e tipos de envase / CriopreservaÃÃo of semen human being-comparison between method of congelation and types of plants

Marcelo Borges Cavalcante 20 December 2004 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O presente trabalho tem como objetivo determinar o melhor mÃtodo de congelaÃÃo e envase de sÃmen humano, quando comparado o mÃtodo rÃpido com o lento e o envase em palhetas de 0,25ml com criotubos de 2ml, utilizando como variÃveis a morfologia e motilidade dos espermatozÃides antes e apÃs a criopreservaÃÃo. Trata-se de um estudo experimental, de validaÃÃo de tÃcnica laboratorial. Foi desenvolvido no Centro de ReproduÃÃo Assistida do CearÃ. Foram analisadas dezoito amostras de sÃmen de dezoito voluntÃrios. As amostras foram submetidas à anÃlise da morfologia e motilidade espermÃtica prÃvia à criopreservaÃÃo. Foi determinada ainda uma curva de motilidade espermÃtica nas primeiras trÃs horas. O meio TEST-YOLK foi utilizado como crioprotetor. Depois de adicionado o crioprotetor, o sÃmen foi dividido em partes iguais e envasado em criotubos e palhetas. Metade dos criotubos e das palhetas foi submetida a criopreservaÃÃo pelo mÃtodo rÃpido (RT e RP, respectivamente) e a outra metade pelo mÃtodo lento (LT e LP, respectivamente). Em seguida, as amostras foram descongeladas e determinadas as morfologias, bem como as motilidades logo apÃs a descongelaÃÃo e a cada hora durante trÃs horas. AnÃlise estatÃstica foi realizada pelo programa de SPSS for Windows versÃo 11.0.0. Houve uma queda, estatisticamente significante, da motilidade apÃs a criopreservaÃÃo, motilidade inicial de 58,1% e motilidades nos diferentes tratamentos de 30,3% (LT), 21,1% (LP), 27% (RT) e 19,2% (RP). TambÃm houve uma diminuiÃÃo significante da morfologia normal apÃs a criopreservaÃÃo, em relaÃÃo à morfologia inicial (14,2%), mas nÃo foi observada diferenÃa entre os mÃtodos (12,8%, 12,6%, 12,6% e 12,4%; RP, RT, LP e LT, respectivamente). O mÃtodo LT foi o que obteve uma curva de motilidade espermÃtica mais prÃxima da observada no sÃmen in natura. Conclui-se que o mÃtodo LT foi o que menos afetou a motilidade espermÃtica e que, apesar de ter sido observada uma piora significativa da morfologia espermÃtica apÃs a criopreservaÃÃo, nÃo houve diferenÃa entre os mÃtodos. Palavras-chaves: CriopreservaÃÃo; PreservaÃÃo do SÃmen; EspermatozÃide; ReproduÃÃo / This research has as objective determines the best freezing method and storage of human semen, when compared the fast method with the slow method and the storage in 0,25ml straws with cryotubes of 2ml, using as variables the morphology and motility of the spermatozoa before and after the cryopreservation. It is an experimental study, laboratorial technique validation. It was developed in the Assisted Reproduction Center of CearÃ. Eighteen semen samples from eighteen men were analyzed. The samples were submitted to the analysis of the morphology and motility previous the cryopreservation. It was still determined a spermatozoa motility curve in the first three hours. TEST-YOLK was used as cryoprotective media. After having added the TEST-YOLK media, the semen was divided in same parts and storage in cryotubes and straws. Half of the cryotubes and of the straws was cryopreserved by the fast method (RT and RP, respectively) and the other half by the slow method (LT and LP, respectively). The samples were thawed and analyzed the morphologies, as well as the motilities soon after the thawed and every hour for three hours. Statistical analysis was done by the SPSS program - Windows version 11.0.0. Motility of spermatozoa decrease after the cryopreservation, initial motility was 58,1% and motilities in the different treatments were 30,3% (LT), 21,1% (LP), 27% (RT) and 19,2% (RP). There was a significant decrease of the normal morphology after the cryopreservation, in relation to the initial morphology, but difference was not observed among the methods (RP=12,8%, RT=12,6%, LP=12,6% e LT=12,4%). The motility of LT method was closer than that obtained in the fresh semen. The method LT showed the best recovery of motile cells after freezing and thawing. There was not difference among the methods when appraised the morphology. Key-Word: Cryopreservation; Semen preservation; Spermatozoa; Reproduction.

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