Sperm

Life 16 September 2020 By Christa Lesté-Lasserre A reconstruction of a female ostracod’s reproductive organ filled with sperm, suggesting it was inseminated shortly before being trapped in resinR. Matzke-Karasz Dozens of perfectly preserved sperm coiled up inside the reproductive tract of a 100-million-year-old female microcrustacean have been identified as the oldest animal sperm ever found.…

Author: “Smartphone use in the evening, tablet use after bedtime, and television use in the evening were all correlated with the decline of sperm concentration.“ DARIEN, Ill. — Numerous studies link smartphone or tablet use at night to trouble falling asleep. Now, a new study finds yet another compelling reason to avoid such gadgets before bed — at…

By Clare Wilson Less like an eel, more like an otterPolymaths-lab.com Sperm swim differently to how we thought. Rather than undulating their tails symmetrically, like an eel, they have a lopsided wiggle that combines with spinning about their long axis to give an overall forward motion. “The asymmetry cancels out because of the rotation,” says…

By Michael Le Page The site of sperm production, as shown in a coloured scanning electron micrograph imageSTEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY The first reliable way of isolating sperm stem cells from the testes and growing them outside the body could help infertile men have genetic children of their own. A few teams have…

Health 10 July 2020 By Jason Arunn Murugesu Sperm with an inactive portion of their tail actually swim fasterSebastian Kaulitzki / Alamy A human sperm can move up to 70 per cent faster if it has a lazy tail, a finding that could pave the way for new fertility diagnostic tests. Sperm cells use their…