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Latest Sperm Stories

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2010-08-12 06:25:00

Obesity in younger men may lead to lower sperm count, a new study reported in the journal Fertility and Sterility suggests. The findings add to evidence that ties obesity to relatively poorer quality sperm. Several recent studies have found that compared with thinner males, obese men tend to have lower sperm counts, fewer rapidly mobile sperm and fewer progressively motile sperm, which refers to sperm that swim forward in straight lines rather than swimming about aimlessly. But age is also...

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2010-08-09 11:35:00

Researchers genetically engineer glow-in-the-dark sperm in fruit flies, revealing much more about sexual selection A lot has changed about the way scientists study sexual selection and reproduction. Some of it has to do with new tools; some of it has to do with new attitudes. There is a lot more going on than just "sperm meets egg." "It was simply thought of as "this army of sperm competing," so it functioned as a raffle; the more tickets you bought, the more sperm you transferred, the more...

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2010-07-16 10:55:15

What do a trout, sea anemone, rooster, fly and man have in common? Just as styles in sexy clothes or fashion change from year to year and culture to culture, "sexy" genes, or genes specific to sex, also change rapidly. But there is one sex-specific gene so vital, its function has remained unaltered throughout evolution and is found in almost all animals, according to new research from Northwestern University Feinberg School of Medicine. The gene, called Boule, is responsible for sperm...

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2010-06-24 06:35:00

A woman's body could be instinctively selective about sperm, allowing some sperm to make it to the egg while killing off the chances of less suitable contenders, an Australian researcher said Wednesday. Professor Sarah Robertson, of the University of Adelaide, suggested that sperm contains "signaling molecules" that activate immunity changes in a woman's body so the sperm is accepted. However, some apparently healthy sperm have failed to activate these changes, leading Prof. Robertson to...

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2010-06-16 14:43:09

Inbred male sperm have been found to fertilize fewer eggs when in competition with non-inbred males according to a new study by the University of East Anglia. Research into the breeding habits of the red flour beetle, published June 15 in Proceedings of the Royal Society B, shows that the reduced fitness of inbred beetles, known as 'inbreeding depression', reveals itself in competitive scenarios. Inbreeding is a potentially important problem in declining species across the world, and...

2010-06-02 13:46:50

Since the beginning, plants and animals have deployed various mechanisms to fight pathogens. Proteins have always played an important part in this armoury, and a broad variety of defensin proteins have become part of the immune system of plants, insects and other animals except mammals. Now scientists from Regensburg discovered that those proteins also play a role in the "sex life" during the fertilization process of plants. These findings will be published next week in the online, open...

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2010-05-31 07:15:00

Researchers at Yale School of Medicine have discovered a method to select sperm with the highest DNA integrity in a bid to improve male fertility. The method is comparable to that of the egg's natural selection abilities, according to the study published in the June/July issue of the Journal of Andrology. "Our results could help address the fact that approximately 40 percent of infertility cases can be traced to male infertility," said the senior author of the study, Gabor Huszar, M.D.,...

2010-04-27 08:29:07

Two independent groups of researchers have identified distinct roles for two proteins in a family of proteins known as PLA2s as crucial for sperm function and fertility in mice. These data identify proteins that could underlie causes of infertility and provide potential targets for the development of new contraceptive agents and new approaches to treating infertility. In addition, these data provide a caution to those developing drugs that target members of this closely related group of...

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2010-03-19 08:22:45

Previously unobservable events occurring between insemination and fertilization are the subject of a groundbreaking new article in Science magazine (March 18) by Mollie Manier, John Belote and Scott Pitnick, professors of biology in Syracuse University's College of Arts and Sciences. By genetically altering fruit flies so that the heads of their sperm were fluorescent green or red, Belote and his colleagues were able to observe in striking detail what happens to live sperm inside the female....

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2010-03-19 08:18:22

Leafcutter ant queens can live for twenty years, fertilizing millions of eggs with sperm stored after a single day of sexual activity. Danish researchers who have studied ants at the Smithsonian Tropical Research Institute in Panama since 1992 discovered that in both ant and bee species in which queens have multiple mates, a male's seminal fluid favors the survival of its own sperm over the other males' sperm. However, once sperm has been stored, leafcutter ant queens neutralize male-male...


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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