Sperm cell fighting
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Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg  during sexual reproduction. Competition can occur when females have multiple potential mating partners. Greater choice and variety of mates increases a female's chance to produce more viable offspring. Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase males' chance of reproductive success.
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Chinese Scientists Turn Mouse Stem Cells Into Working Sperm Cells
Sperm competition - Wikipedia
People constantly encounter viruses, bacteria or parasites. Fortunately, our skin, the specialized lining of our guts and other parts of our body that are exposed to the outside world prevent them from entering. Those defences, which we also call the human immune system, have two branches — innate and adaptive. Our innate immune system is our first line of defence.
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Human eggs able to 'choose' which sperm cell reaches it, study finds
By Emma Young. Laboratory tests show that lemon juice is a potent destroyer of both HIV and sperm, Australian researchers say. If planned tests in primates and people are successful, lemon juice could be ideal for women without easy access to safe barrier contraceptives, such as condoms, says the team at Melbourne University, led by Roger Short. But experts in anti-AIDS medications warn that the safety of using the juice internally and its efficacy in people are as yet unknown. Short says a solution of 10 per cent lemon juice produced a fold reduction in HIV activity in a lab sample.
Home About MedWorm. Health News. The role of Chito-oligosaccharide in regulating ovarian germ stem cells function and restoring ovarian function in chemotherapy mice In recent years, the discovery of ovarian germ stem cells OGSCs has provided a new research direction for the treatment of female infertility.
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