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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

Variabilidade das sub-populações de espermatozóides avaliados pela cinética em sistema computadorizado e combinação de sondas fluorescentes como praâmetro quantitativo do sêmen congelado de ovinos

Sousa, Daniel Bartoli de [UNESP] 17 January 2007 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:35:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-01-17Bitstream added on 2014-06-13T19:24:36Z : No. of bitstreams: 1 sousa_db_dr_botfmvz.pdf: 488884 bytes, checksum: cee00747e11c814a32c18443659e8194 (MD5) / Universidade Estadual Paulista (UNESP) / Várias pesquisas foram desenvolvidas visando a melhoria da congelabilidade do sêmen ovino. Contudo, ainda não houve progressos significativos na fertilidade do sêmen congelado após a inseminação artificial cervical. Diversos sistemas de análise computadorizada do movimento espermático (CASA) têm sido propostos e aplicados na tentativa de quantificar características específicas do movimento espermático, podendo ainda determinar a presença e a cinética das subpopulações de espermatozóides. Muitos testes para avaliar a função espermática foram desenvolvidos, permitindo analisar simultaneamente diferentes aspectos da função espermática. Análise da função mitocondrial oferece uma maneira de acessar a motilidade espermática. Foram objetivos otimizar o sistema CASA na avaliação do sêmen congelado; determinar parâmetros da cinética espermática que expressem analogia com as características da avaliação das membranas plasmática, acrossomal e mitocondrial (IP, FITC-PSA e JC-1; MITO; R-123) e utilizar conjuntamente os parâmetros fornecidos pelo sistema CASA e pelas sondas fluorescentes para agrupar as amostras de maneira qualitativa. Vinte e seis amostras de sêmen congelado de diferentes carneiros foram estudadas pelo CASA obtendo-se para os parâmetros VCL, VAP, VSL, ALH, BCF, LIN, STR, ELONG dados médios e individuais para cada espermatozóide e por sondas fluorescentes para a avaliação simultânea da integridade de membrana plasmática, reação acrossomal e potencial de membrana mitocondrial. Estatisticamente aplicou-se a análise exploratória de técnicas multivariadas obtendo-se três fatoriais sendo o primeiro fator F1 positivo e alto para as variáveis VAP, VSL, STR e LIN, que é interpretado com um fator relacionado à progressividade. Para o segundo fator F2, associam as variáveis VCL, ALH e MT, que representam um fator de deslocamento... / Many researches were developed to improve the ram semen criopreservation. However, no significant advances in the fertility rates with the frozen semen were observed with cervical artificial insemination. Several computer-assisted motility assessments (CASA) systems have been considered and applied in the attempt to quantify specific characteristics of the sperm motion and still them being able to determine the spermatozoa presence and subpopulations kinematics. A large number of sperm functions evaluation had been developed, making it possible to analyze different aspects of the sperm function simultaneously. Analysis of the mitochondrial function offers a way to have access the sperm motility. The aim of this study was to optimize the CASA system in the evaluation of the ram frozen semen; determine parameters of the sperm kinematics that express analogy with the characteristics of the evaluation of plasmatic, acrossomal and mitochondrial membranes (PI, FITC-PSA and JC-1; MITO; R-123) and use CASA parameters together with the fluorescent probes to group samples in a qualitative way. Twenty and six frozen semen samples of different rams were evaluated by CASA system for mean and individual sperm motion parameters VCL, VAP, VSL, ALH, BCF, LIN, STR, ELONG and for fluorescent probes leads for the simultaneous evaluation of the integrity of plasmatic, acrossomal membranes and membrane mitochondrial potential. The statistic applied was multivariate analysis getting to three different factorials. The first factor was positive and high (F1 factor) for variables VAP, VSL, STR and LIN, that were interpreted with the forward displacement. For F2 factor, there were associate variables VCL, ALH and MT that represent the displacement. The F3 factor, whose interpretation has to do with available energy, was associated with variables BCF, MITO and ELONG...(Complete abstract, click electronic address below)

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