The effect of pretreatment of rabbit sperm cells with different concentrations of cholesterol-loaded cyclodextrin (CLC) on the occurrence of premature acrosome reactions during 72 h of liquid storage was investigated in three successive experiments. The aim of the first experiment was to establish a liquid storage model to facilitate premature acrosome reactions in rabbit sperm cells and, there...

this research compares the psychological well-being of female heads of household and woman in male-headed in city of tehran. it was a descriptive cross-sectional study. statistical population was consisted of female heads of family under coverage of imam khomeini aid committee and woman in male-headed households in city of tehran in 2012. the sample consisted of 280 subjects including 140 femal...

This work presents a specifically designed spiral type inertial micro-fluidic channel for separating non-motile sperm cell from cellular debris. Demonstration with a mixture of non-motile sperm and red blood cells showed that 82% of sperm could be focused into a separate outlet from the red blood cells.

Elucidating the cellular and molecular mechanisms regulating sperm selection and transport in the vagina of the hen had been the focus of a limited amount of research over the past decade. New observations indicate the presence of nonneuron endocrine cells in the epithelia lining the lumina of the turkey hen vagina and uterovaginal junction. Although no cells in the vagina or uterovaginal junct...

Sperm cells have been isolated from pollen tubes growing in style segments of the dicotlyledon Rhododendron macgregoriae and the monocotyledon Gladiolus gandavensis by the in vivo/in vitro method at various stages of fertilization. Pollen tubes emerged from the cut end of the style into agar medium, and more than 95% contained sperm cells. Sperm cells were released from the pollen tubes by osmo...

In nematode, sperm activation (or spermiogenesis), a process in which the symmetric and non-motile spermatids transform into polarized and crawling spermatozoa, is critical for sperm cells to acquire fertilizing competence. SPE-8 dependent and SPE-8 independent pathways function redundantly during sperm activation in both males and hermaphrodites of Caenorhabditis elegans. However, the downstre...

The aim of the research was to comparative study effectiveness synthetic antioxidants – lipid-soluble (butylated hydroxytoluene, BHT) and water–soluble (trolox) analogues vitamin E for cryopreservation Russian sturgeon sterlet sperm in presence modified Stein’s medium. ability phenolic reduce level lipid peroxidation sperm, beneficial effect on motility thawed has been shown. addition lipid- wa...

The outcome of sperm competition (i.e. competition for fertilization between ejaculates from different males) is primarily determined by the relative number and quality of rival sperm. Therefore, the testes are under strong selection to maximize both sperm number and quality, which are likely to result in trade-offs in the process of spermatogenesis (e.g. between the rate of spermatogenesis and...

Transgenic modification of sperm before fertilization has distinct advantages over conventional transgenic methods. The primary advantage is that the mosaicism inherent in those other techniques is avoided. A culture system using primary cultures of zebrafish male germ cells, in which the differentiation from spermatogonia to functional sperm can occur in vitro, provides the opportunity for gen...

BACKGROUND The condensed state of the human sperm's chromatin is essential for the compact structure of the spermatozoon head, which is important for the fertilization process. The enzymes DNA topoisomerases (topo I and topo II) are responsible for the topological structure of the chromatin in somatic cells. The activities and the characterization of topoisomerases in mature human sperm cells h...