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Latest Germ cells Stories

80c057cc65eb5700e2fcd6fc58527aca1
2008-01-23 14:55:00

COLUMBIA, Mo. -- Defective sperm cells do not pass through the body unnoticed. A new University of Missouri study provides evidence that the body recognizes and tags defective sperm cells while they undergo maturation in the epididymis, a sperm storage gland attached to the testis. According to researchers, only the best sperm that have the highest chance of succeeding in fertilization will survive the production process without a "tag." A small protein called ubiquitin marks abnormal sperm...

3336f174efb1f696dad2f3c392ba53c11
2008-01-23 11:35:00

Scientists at the University of Liverpool have found that field mice have evolved a unique way of ensuring faster fertilization, a phenomenon which could explain some cases of infertility in humans. The team, in collaboration with Charles University, Prague, found that field mice sacrifice some of their immunity protection in favor of a more rapid fertilization process. This occurs due to the absence of a protein, called CD46. Present in both animals and humans, it helps protect the body's...

2006-02-16 07:00:00

Key protein helps them penetrate an egg HealthDay News -- Successful sperm use their tails to make one final jump into the egg -- and new research is revealing just how it happens. A protein called CatSper1 is crucial to the ability of sperm to suddenly switch their tail movement from a smooth swimming motion to the sharp snap that thrusts them into the ovum, U.S. researchers report in the current issue of the journal Nature. The discovery could lead to new avenues of research into male...

2006-02-14 14:36:21

A new paper in the February 15th issue of Genes & Development lends novel insight into the cellular changes that occur in sperm while they reside in the female reproductive tract "“ providing a new understanding of the molecular genetics of successful fertilization. It had been believed for decades that spermatozoa are translationally silent. However, Dr. Yael Gur and Haim Breitbart (Bar-Ilan University, Israel) now show that, in fact, protein translation does take place in...

2005-10-06 17:15:00

DURHAM, N.C. -- An immature egg's internal nutrient supply is critical to its survival, an insight that offers a new route to understanding and treating infertility due to egg death, according to Duke University Medical Center researchers. As women age, their stockpile of immature eggs, called oocytes, diminishes through cell death, eventually leading to infertility. In studies with frog oocytes, the Duke researchers found that the nutrient storehouse, or yolk, plays a key role in...

2005-08-26 19:30:00

Johns Hopkins biologists have determined how developing embryos tell their specialized "germ cells" whether to develop into a male's sperm or a female's eggs. Present in both male and female embryos, germ cells are the precursors to both sperm and eggs. Unable to "decide" on their own which to become, however, germ cells must take "advice" from other cells within embryos as to which is the appropriate sex. The Johns Hopkins researchers have found that this advice is delivered by a sequence...

2005-06-21 18:55:00

New research has shown that combinations of chemicals found in everyday products and food have subtle but potentially damaging effects on sperm fertility. Professor Lynn Fraser told the 21st annual conference of the European Society of Human Reproduction and Embryology today (Wednesday), that her previous research had shown that certain chemicals known to mimic the female sex hormone, oestrogen, could individually affect the correct functioning of mouse sperm, but now her new research showed...

2005-06-19 14:05:00

Copenhagen, Denmark: Scientists in the UK have proved that human embryonic stem cells can develop in the laboratory into the early forms of cells that eventually become eggs or sperm. Their work opens up the possibility that eggs and sperm could be grown from stem cells and used for assisted reproduction, therapeutic cloning and the creation of more stem cells for further research and for the improved treatments for patients suffering from a range of diseases. Behrouz Aflatoonian will tell...


Word of the Day
monteith
  • A large punch-bowl of the eighteenth century, usually of silver and with a movable rim, and decorated with flutings and a scalloped edge. It was also used for cooling and carrying wine-glasses.
  • A kind of cotton handkerchief having white spots on a colored ground, the spots being produced by a chemical which discharges the color.
This word is possibly named after Monteith (Monteigh), 'an eccentric 17th-century Scotsman who wore a cloak scalloped at the hem.'
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