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E.g., 02/15/2019
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Your search has returned 61 articles:
  • News

    Slow sperm may fail at crashing ‘gates’ on their way to an egg

    The female reproductive tract is an obstacle course that favors agile sperm. Narrow straits in parts of the tract act like gates, helping prevent slower-swimming sperm from ever reaching an egg, a study suggests. 

    Using a device that mimics the tract’s variable width, researchers studied sperm behavior at a narrow point, where the sex cells faced strong head-on currents of fluid. The...

    02/13/2019 - 14:49 Development
  • News in Brief

    A protein in mosquito eggshells could be the insects’ Achilles’ heel

    Mosquito researchers may have hatched a new plan to control the bloodsuckers: Break their eggshells.

    A protein called eggshell organizing factor 1, or EOF1, is necessary for some mosquito species’ eggs and embryos to develop properly, a new study finds. Genetically disrupting production of that protein in Aedes aegypti mosquitoes caused about 60 percent of their normally dark eggshells...

    01/08/2019 - 14:00 Animals, Genetics, Development
  • News

    Gene editing creates mice with two biological dads for the first time

    For the first time, researchers have created mice with two dads. No female contributed to the rodents’ genetic makeup.

    This unusual reproduction took place in a lab where researchers gathered fathers’ stem cells, and used them to produce embryos that were implanted into surrogate mothers. The technique required scientists to edit the animals’ genes in order for the mice to mature enough...

    10/11/2018 - 12:02 Cells, Development
  • Science Visualized

    See these dazzling images of a growing mouse embryo

    A new microscope is giving researchers an unprecedented view of how mammals are built, cell by cell.

    Light sheet microscopes use ultrathin laser beams to illuminate sections of a specimen while cameras record those lit-up sections. Previous iterations of the device have captured detailed portraits of living zebra fish and fruit fly embryos as they develop. Kate McDole, a developmental...

    10/11/2018 - 11:00 Cells, Development, Animals
  • Feature

    Lisa Manning describes the physics of how cells move

    Lisa Manning, 38Physics and biologySyracuse University

    Think of tissues as mosh pits of cells. The cells may not be able to crowd surf, but they can jam.

    Specifically, cells can undergo a jamming transition, a physical role change that was previously known to occur only among foams, sand and other nonliving materials. It’s one of the ways that physicist Lisa Manning has shown how...

    09/26/2018 - 08:30 Biomedicine, Cells, Development, Physics
  • News

    Teens born from assisted pregnancies may have higher blood pressure

    Assisted pregnancies give infertile couples the chance at a child. But kids conceived with reproductive technologies, such as in vitro fertilization, or IVF, were more likely to develop high blood pressure as adolescents than their naturally conceived counterparts, a new study finds.  

    Of 52 teens conceived with technological help, eight had hypertension, defined as blood pressure...

    09/05/2018 - 06:00 Health, Development, Epigenetics
  • Mystery Solved

    How salamanders can regrow nearly complete tails but lizards can’t

    Salamanders and lizards can both regrow their tails, but not to equal perfection.

    While a regenerated salamander tail closely mimics the original, bone and all, a lizard’s replacement is filled with cartilage and lacks nerve cells. That contrast is due to differences between stem cells in the animals’ spinal cords, researchers report online August 13 in Proceedings of the National...

    08/17/2018 - 12:30 Cells, Development, Animals, Evolution
  • News in Brief

    Here’s how fast cell death can strike

    Scientists now know how long it takes for a cell to tell itself it’s time to die.

    Signals triggering a type of cell suicide called apoptosis move through a cell like a wave, traveling at a rate of 30 micrometers per minute, Stanford University systems biologists Xianrui Cheng and James Ferrell Jr. report in the Aug. 10 Science.

    These findings resolve a debate over whether these...

    08/09/2018 - 15:17 Cells, Development
  • News

    Zika may harm nearly 1 in 7 babies exposed to the virus in the womb

    Babies exposed to a Zika infection while in the womb are not out of the woods even if they look healthy at birth.

    Nearly 1 in 10 of 1,450 babies examined developed neurological or developmental problems, such as seizures, hearing loss, impaired vision or difficulty crawling, a study from the U.S. Centers for Disease Control and Prevention finds. It’s the first tally of the health of...

    08/07/2018 - 17:27 Health, Development
  • News

    This ‘junk’ gene may be important in embryo development

    A once-maligned genetic parasite may actually be essential for survival.

    Mouse embryos need that genetic freeloader — a type of jumping gene, or transposon, called LINE-1 — to continue developing past the two-cell stage, researchers report in the July 7 Cell.

    Many scientists “charge that these are nasty, selfish genetic elements” that jump around the genome, making mutations and...

    07/03/2018 - 07:00 Development, Cells, Genetics