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Men, beware!The prospect of female-only conception is getting closer, leaving aside the science fiction movies. Soon, women could produce sperm of their own, a technology that could permit lesbian couples to deliver their own biological offspring. After scientists managed to produce predecessors of sperm cells from m... |
19 April 2007
08:51 GMT |
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F***ed to the bone could get another meaning as German researchers have successfully achieved immature sperm cells from human bone marrow stem cells. If they can develop to sperm cells, within five years we could have a breakthrough fertility treatment. The mixed team from the Universities of Göttingen and Münster and the Me... |
16 April 2007
08:35 GMT |
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It's easy to blame it on the woman, but in 15 % of cases, the guilt can be attributed to the stud. Now Cornell study could bring more hope for these couples, as a research team detected a gene mutation that induces male infertility in mice. This is the first dominant mutation found to specifically trigger infert... |
11 April 2007
04:18 GMT |
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Were the real cowboys as macho as Clint Eastwood? Well, a new research suggests that pregnant women who consume beef daily could be more likely to deliver sons with lower sperm counts than others. Sperm development takes place in stages throughout a guy's life from the pre-natal months to adulthood, but a critic... |
28 March 2007
02:59 GMT |
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Imagine that your balls or your ovaries do not produce your sperm or your eggs but those of your brothers or sisters!This is called "germ line chimerism" and as odd as it sounds, it has been found to be a norm in one of our relatives, the marmoset monkey from tropical South America! In chimerism, some of the sperm o... |
27 March 2007
10:11 GMT |
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The scientific world is shocked by the world's only known case of "semi-identical" twins. Signaled by journals Nature and Human Genetics, this American case (whose exact location has not been revealed) is of a twin pair identical on their mother's side, but sharing only half their genes on their father'... |
27 March 2007
07:02 GMT |
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Contamination can affect wildlife where it hurts most for the males: sexual success. And this for generations...A team from The University of Texas at Austin have found that female rats avoid males whose great-grandfathers were affected by a common fruit crop fungicide, named vinclozolin, preferring instead males wit... |
27 March 2007
04:35 GMT |
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The epic fights between sperm whales and giant squids witnessed by sailors fired the imagination of many biologists and nature lovers, with their mysterious cover. And this especially because sperm whales are the largest predator in the world, 18 m (59 ft) long and 50 tons weight, with a huge appetite for squids, y... |
12 March 2007
11:05 GMT |
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Psychopath minds, give it up!Even the vasectomy or lack of sperm cells won't save your butt from jail now ... A new DNA analysis technique will allow individual detection even in semen samples with no sperm cells, in cases of sexual assault. In fact, the main problem of forensics trying to fingerprint the DNA o... |
8 March 2007
05:50 GMT |
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Five years ago, a team at Georgia State University discovered that people who are involuntarily celibate or abstinent and often exhibit depressive feelings (like anger, frustration, self-doubt, and even proper depression) are driven into this by "missed opportunities", due to living without sex. Another researcher di... |
6 March 2007
11:57 GMT |
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Promiscuity is wide spread in nature. Females can have sexual contacts with many males, something their male partners cannot prevent. That's why they have developed certain mechanisms that turn these actions sterile and make them father the offspring: this is called sperm competition. In the wasp spiders, the ma... |
6 March 2007
06:33 GMT |
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Spermicides are chemicals that kill sperm cells, and are used as a contraceptive method. They are inserted vaginally prior to intercourse, but employed alone, this method has a low efficiency (18 % annual failure). They are usually combined with other contraceptive methods like diaphragms, condoms or cervical caps. N... |
5 March 2007
08:55 GMT |
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