Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Spermatozoon"”.
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Microsurgical Fertilization of Mammalian Eggs: An Assessment of Clinical Utilization
… fertilization is the technique in which a spermatozoon or sperm nucleus is injected into the cytoplasm of an egg. To establish a foundation for the use of microsurgical fertilization as a means of treating infertility, this study evaluated the procedure in hamster and human eggs. Hamster …
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Negative biomarkers of sperm quality and male fertility
… evaluation using biomarkers to detect specific spermatozoon characteristics is growing in popularity in both andrology laboratories and agricultural studs. Here we investigate the application of two biomarkers, the sperm chromatin structure assay (SCSA) and the post-acrosomal ww-domain binding …
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Dynamic study of the piezo-driven pipettes in intracytoplasmic sperm injection
… technology (ART) procedure in which a single spermatozoon is mechanically injected into the cytoplasm of an oocyte using an injection pipette. During ICSI, one piezo-driven actuator (PDA) connected to the pipette is routinely utilized. Importantly, the pipettes driven by PDA are typically …
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Novel method of selecting human spermatozoa for <em>In </em><em>Vitro </em>fertilization
… must manually and quickly choose a single spermatozoon and inject it into an oocyte. Therefore, an efficient technique for sperm selection can potentially improve fertilization and pregnancy rates in IVF.<br/>In this thesis I developed a novel physiological method of preparing and selecting …
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Molecular Characterization of the Male Germ Cell Expressed Genes Hook1 and TSEP22
… In dieser Region liegt der azh-Locus (abnormal spermatozoon head shape). Durch die Analyse der DNA wie auch der RNA homozygoter azh-Mäuse konnte belegt werden, dass eine Deletion der Exons 10 und 11 des Hook1-Gens vorliegt und dies zu einer Verschiebung des Leseraster führt. Zudem belegen …
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CatSper: Characterisation in Human Spermatozoa and Clinical Significance
Before a mature spermatozoon is able to fertilise the oocyte, it must first traverse the female reproductive tract, through obstacles such as highly viscous mucus. As the sperm is thought to be transcriptionally and translationally inactive, it must rely on cues from its external environment in …
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In vitro assessment of fertilization and embryo development with Bovine spermatozoa after scrotal insulation
… of normal decondensation of the penetrating spermatozoon. The inability to consistently measure apoptosis in early stage embryos complicates the assessment of differences in embryo quality. These observations support the hypothesis of uncompensable seminal traits in IVF with abnormal …
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Geometry and Hydrodynamics of Swimming with a Bundle of Bacterial Flagella
… of patterns - from the whip-like motion of a spermatozoon tail, to the breast-stroke pattern of biflagellate algae such as Chlamydomonas, down to the metachronal waves formed by thousands of cilia on the surface of a Paramecium. On the other hand, bacteria are equipped with corkscrew-shaped …
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Mechanisms and consequences of DNA damage, response and apoptosis in spermatozoa.
DNA damage in spermatozoa is a crucial contributor to spontaneous abortion, severe genetic disease in the offspring and infertility. The chromatin of spermatozoa is highly compacted, transcriptionally and translationally silent, hence lacking DNA damage response (DDR). DDR foci follow within …
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Mechanisms and consequences of DNA damage, response and apoptosis in spermatozoa.
DNA damage in spermatozoa is a crucial contributor to spontaneous abortion, severe genetic disease in the offspring and infertility. The chromatin of spermatozoa is highly compacted, transcriptionally and translationally silent, hence lacking DNA damage response (DDR). DDR foci follow within …