Word: sperms
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...ancients had no way of understanding human sexuality the way we understand it,” he told the audience of 10. “This is where science was 200 years ago,” he said, pointing at a picture of a tiny man inside a sperm cell. He argued that the Bible should not be interpreted verbatim, giving the example of levirate marriage, under which a man is compelled to marry his dead brother’s widow. Larose said homosexuals have been singled out and discriminated against on the basis of biblical texts deliberately used...
Studies involving rat and human subjects have suggested that high exposures to certain kinds of phthalates can cause cancer, developmental and sex-hormone abnormalities (including decreased testosterone and sperm levels and malformed sex organs) in infants, and can affect fertility. The U.S. Food and Drug Administration has no regulations on the use of phthalates, does not require the labeling of phthalate content on products and does not consider the quantities to which people are exposed to be harmful. But other countries think otherwise. In 2004, the European Union banned two types of phthalates in cosmetics and also bans the chemical...
...Boston, shows that Hwang's stem cell line contains the first human cells to be generated not through SCNT, but through a process called parthenogenesis, sometimes referred to as virgin birth, since development is sparked spontaneously from the egg alone, rather than from the union of egg and sperm. Parthenogenesis is always a risk during nuclear transfer, since the process involves extensive manipulation of the egg and its nucleus. At the time that Hwang's original paper was published in Science, stem cell researchers raised the possibility that the cells had been generated by the egg alone, but the limited...
...fingerprint of the stem cells was consistent with that of the egg. "The genetic signature of a parthenote is very very obvious," says Daley. Because the genetic material in parthenotes comes only from the egg, they are missing key genes for development that normally come from the sperm, and therefore their genetic profiles are very distinctive...
...pregnancy numbers. It's not enough to credit the virtues of responsibility and better sex education. Something racier is desired. According to some writers, fewer teens are getting pregnant because they've all switched to oral sex. Or maybe the phenomenon is due to a still unexplained decline in sperm counts...