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  • sperm
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Your search has returned 49 articles:
  • News in Brief

    How dad’s stress changes his sperm

    Sperm from stressed-out dads can carry that stress from one generation to another. “But one question that really hasn’t been addressed is, ‘How do dad’s experiences actually change his germ cell?’” Jennifer Chan, a neuroendocrinologist at the University of Pennsylvania, said November 13 in Washington, D.C., at the annual meeting of the Society for Neuroscience.

    Now, from a study in mice...

    11/15/2017 - 15:30 Health, Development
  • News

    These spiders may have the world’s fastest body clocks

    WASHINGTON, D.C. — If it takes you a while to recover from a few lost hours of sleep, be grateful you aren’t an orb weaver. 

    Three orb-weaving spiders — Allocyclosa bifurca, Cyclosa turbinata and Gasteracantha cancriformis — may have the shortest natural circadian rhythms discovered in an animal thus far, researchers reported November 12 at the Society for Neuroscience’s annual meeting...

    11/14/2017 - 16:00 Animals, Evolution, Development
  • News

    In a first, human embryos edited to explore gene function

    For the first time, researchers have disabled a gene in human embryos to learn about its function.

    Using molecular scissors called CRISPR/Cas9, researchers made crippling cuts in the OCT4 gene, Kathy Niakan and colleagues report September 20 in Nature. The edits revealed a surprising role for the gene in the development of the placenta.

    Researchers commonly delete and disable genes...

    09/20/2017 - 13:24 Genetics, Development, Science & Society
  • News

    Embryos kill off male tissue to become female

    Add a new ingredient to the sugar, spice and everything nice needed to make girls.

    A protein called COUP-TFII is necessary to eliminate male reproductive tissue from female mouse embryos, researchers report in the Aug. 18 Science. For decades, females have been considered the “default” sex in mammals. The new research overturns that idea, showing that making female reproductive organs is...

    08/17/2017 - 14:17 Development
  • News

    Common drugs help reverse signs of fetal alcohol syndrome in rats

    A common blood sugar medication or an extra dose of a thyroid hormone can reverse signs of cognitive damage in rats exposed in utero to alcohol. Both affect an enzyme that controls memory-related genes in the hippocampus, researchers report July 18 in Molecular Psychiatry.

    That insight might someday help scientists find an effective human treatment for fetal alcohol spectrum disorders,...

    07/18/2017 - 14:47 Health, Development
  • News

    How bearded dragons switch their sex

    When things get hot, embryonic bearded dragon lizards turn female — and now scientists might know why. New analyses, reported online June 14 in Science Advances, reveal that temperature-induced changes in RNA’s protein-making instructions might set off this sex switch. The findings might also apply to other reptile species whose sex is influenced by temperature.

    Unlike most mammals, many...

    06/14/2017 - 14:07 Development, Animals, Genetics, Epigenetics
  • Science Ticker

    Mouse sperm survive space to spawn

    Mouse sperm could win awards for resilience. Sperm freeze-dried and sent into space for months of exposure to high levels of solar radiation later produced healthy baby mice, researchers report May 22 in Proceedings of the National Academy of Sciences.

    If humans ever embark on long-term space flights, we’ll need a way to reproduce. One potential hurdle (beyond the logistical challenges...

    05/22/2017 - 15:00 Development
  • News in Brief

    Mouse sperm survive space to fertilize eggs

    Mouse sperm could win awards for resilience. Sperm freeze-dried and sent into space for months of exposure to high levels of solar radiation later produced healthy babies, researchers report online May 22 in Proceedings of the National Academy of Sciences.

    If humans ever embark on long-term space flights, we’ll need a way to reproduce. One potential hurdle (beyond the logistical...

    05/22/2017 - 15:00 Development
  • Teaser

    For calmer chickens, bathe eggs in light

    Fearful, flighty chickens raised for eating can hurt themselves while trying to avoid human handlers. But there may be a simple way to hatch calmer chicks: Shine light on the eggs for at least 12 hours a day.

    Researchers at the University of California, Davis bathed eggs daily in light for different time periods during their three-week incubation. When the chickens reached 3 to 6 weeks...

    02/06/2017 - 14:00 Animals, Development
  • Science Visualized

    How to make a fish face, and other photo contest winners

    View slideshow

    This forlorn-looking face of a 4-day-old zebrafish embryo represents “a whole new avenue of research” for geneticist Oscar Ruiz, who studies how faces and facial abnormalities develop at the cellular level.  

    The research is possible thanks to a new method, developed by Ruiz and colleagues at the University of Texas MD Anderson Cancer Center in Houston, for mounting...

    10/28/2016 - 10:15 Development, Science & Society