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tag eggs developmental biology

Old ovaries, new eggs
Tia Ghose | Apr 11, 2009 | 2 min read
Are female mammals born with all the eggs they'll ever have, or can they produce new eggs into adulthood? The question has been vociferously debated, but now, a study published online in Nature Cell Biology today (April 12) reports that at least in mice, adult female ovaries have a store of stem cells that have the potential to generate new eggs. Human oocyte Image: Wikimedia CommonsThe study "is a huge step in quelling this debate," Jonathan Tilly, a reproductive biologist at Harvard Medical
Gia Voeltz: Cellular Cartographer
Karen Zusi | Dec 1, 2015 | 3 min read
Associate Professor, Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder. Age: 43
A sea urchin genome project
William Wells(wells@biotext.com) | Aug 16, 2000 | 1 min read
Sea urchins are popular in developmental biology research thanks to their well defined embryology, the ease of gene transfer into eggs, and the abundance of eggs for biochemical work. Now the sea urchin genome project is off to a start with sequence from the ends of 76,020 bacterial artificial chromosome (BAC) recombinants. In the August 15 Proceedings of the National Academy of Sciences, Cameron et al. report that these sequence tag connectors (STCs) occur at an average of 10 kb apart in the s
An illustration of flowers in the shape of the female reproductive tract
Uterus Transplants Hit the Clinic
Jef Akst | Aug 1, 2021 | 10+ min read
With human research trials resulting in dozens of successful deliveries in the US and abroad, doctors move toward offering the surgery clinically, while working to learn all they can about uterine and transplant biology from the still-rare procedure.
C. elegans cell lineage, circa 1981
Elie Dolgin | Jun 1, 2008 | 1 min read
Credit: courtesy of John Sulston" /> Credit: courtesy of John Sulston Starting in 1980, John Sulston spent 18 months hunched over a microscope watching Caenorhabditis elegans embryos divide. Together with Bob Horvitz at the Laboratory of Molecular Biology in Cambridge, England, he had already mapped the fate of every cell in the adult worm from the moment the egg hatched, but the embryonic cell line
Untangling Neuronal Calcium Signaling
Amy Adams | Jan 20, 2002 | 10 min read
From the very moment of conception, calcium plays a pivotal role in fetal development. It rushes in as a wave around the egg to herald the sperm's arrival, binding to proteins that help kick off the whole developmental process. From this first influx, calcium continues to play a critical role in how the body's cells respond to outside signals. Calcium tells muscles to contract and nerves to release neurotransmitters, and is at least part of the signal that helps people form and retain memories.
Heritable Histones
Ruth Williams | Sep 18, 2014 | 3 min read
Scientists show how roundworm daughter cells remember the histone modification patterns of their parents.
The Genetics of Society
Claire Asher and Seirian Sumner | Jan 1, 2015 | 10 min read
Researchers aim to unravel the molecular mechanisms by which a single genotype gives rise to diverse castes in eusocial organisms.
Notebook
Eugene Russo | Dec 5, 1999 | 7 min read
Contents Pivotal pump Leptin limbo Clue to obesity Biotech Web site Helping hand Mapping malaria Notebook Pictured above are pigmented bacterial colonies of Deinococcus radiodurans, the most radiation-resistant organism currently known. DEINO-MITE CLEANUP In 1956, investigators discovered a potentially invaluable cleanup tool in an unlikely place. A hardy bacterium called Deinococcus radiodurans unexpectedly thrived in samples of canned meat thought to be sterilized by gamma radiation. The b
Epigenetics: Genome, Meet Your Environment
Leslie Pray | Jul 4, 2004 | 10+ min read
©Mehau Kulyk/Photo Researchers, IncToward the end of World War II, a German-imposed food embargo in western Holland – a densely populated area already suffering from scarce food supplies, ruined agricultural lands, and the onset of an unusually harsh winter – led to the death by starvation of some 30,000 people. Detailed birth records collected during that so-called Dutch Hunger Winter have provided scientists with useful data for analyzing the long-term health effects of prenat

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