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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

Ultrastrukturelle Charakterisierung geschlechtsspezifisch sortierter Spermien / Ultrastructural Characterisation of sex-sorted sperm

Michl, Johannes 29 September 2014 (has links)
No description available.
2

Size-Dependent Inhibition of Sperm Motility by Copper Particles as a Path toward Male Contraception

Chattopadhyay, Purnesh, Magdanz, Veronika, Hernández-Meliá, María, Borchert, Konstantin B. L., Schwarz, Dana, Simmchen, Juliane 05 March 2024 (has links)
Effective inhibition of sperm motility using a spermicide can be a promising approach in developing non-invasive male contraceptive agents. Copper is known to have contraceptive properties and has been used clinically for decades as intrauterine contraceptive devices (IUDs) for contraception in females. Beyond that, the spermicidal use of copper is not explored much further, even though its use can also subdue the harmful effects caused by the hormonal female contraceptive agents on the environment. Herein, the size, concentration, and timedependent in vitro inhibition of bovine spermatozoa by copper microparticles are studied. The effectivity in inhibiting sperm motility is correlated with the amount of Cu²⁺ ions released by the particles during incubation. The copper particles cause direct suppression of sperm motility and viability upon incubation and thereby show potential as sperm-inhibiting, hormone-free candidate for male contraception. In addition, biocompatibility tests using a cervical cell line help optimizing the size and concentration of the copper particles for the best spermicidal action while avoiding toxicity to the surrounding tissue.

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