sperm penetration

sperm penetration

The ability of sperm to move through the cervical mucus, swim up the endometrial cavity and down the fallopian tubes, and penetrate/fertilise the ovum (egg).
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In fact, a continuous observation of oocytes from sperm penetration up to zygote formation should provide information on the delayed appearance of PNi, on pronuclear fusion and premature breakdown of the pronuclear membrane whereas immediate enclosure of both parental genomes in a common envelope will possibly escape detection.
showed the relationship of current use of cigarettes and alcohol to the parameters of seminal fluid analysis, sperm penetration assay, and sperm autoimmunity.
5] Smoking is associated with decline in basic semen parameters such as sperm concentration, viability, forward motility, and morphology [6,7] as well as declines in sperm penetration ability and hence fertilisation rates.
This failure of the IVC systems results in a poor release of cortical granules after sperm penetration, thus resulting in failure of the zona pellucida reaction, and consequently in polyspermy (FUNAHASHI et al.
Sperm Penetration of Vitelline Envelope of SicyoniaIngentis Eggs is Mediated by a Trypsin like Lysin of Acrosomal Vesicle Origin.
The results of zona-free hamster oocyte sperm penetration (SPA) assay, which examines the ability of spermatozoa for capacitation and used for prediction of the likelihood of spontaneous pregnancy in vivo as well as successful fertilization using IVF, are not considered meaningful because of the false positive and false negative rates (Consensus Workshop on Advanced Diagnostic Andrology Techniques, 1996).
3,5,6) Furthermore, recent hydrodynamic estimation of the flagellar force calculated by the resistive-force theory using the real hyperactivated flagellar waves disclosed an important role of low beat frequency of the hyperactivated flagellar movement; namely, the slowly oscillating lateral force generated by the hyperactivated flagellar movement is most effective for sperm penetration through the zona pellucida.
The Global Male Infertility market can be divided into seven segments: DNA Fragmentation Technique, Oxidative Stress Analysis, Microscopic Examination, Sperm Penetration Assay, Sperm Agglutination, CASA, and Others.
The duration of sperm motility was much lower than the average time of opening of the micropyle, 27 seconds, and in this way it can reduce the sperm penetration ability.
On the one hand, there is selection on females to slow down sperm penetration to allow the establishment of an effective block against further sperm penetration.
The secondary effect was to cause thickening of the vaginal mucous, and delays of sperm penetration to the fallopian tubes; therefore, should a spermatozoon penetrate and fertilize the ovum, then changes in the mobility of the fallopian tubes would delay the transport of the embryo and it would starve to death.