Tracking sperm whales and jumbo squid
The sperm whale and its large prey, the jumbo squid, are amo...arine scientists reports the successful tagging of sperm whales and jumbo squid swimming together off Mexicos Pacific coastthe first time that electronic tra...Phthalates now linked to fat, related health risks
... "Substantial declines in testosterone levels and sperm quality have been observed in the United States and other countries over the last several decades which and it urgently requires explanation," Stahlhut said. "While we cant say yet that phthalates are a definite cause, I am certain they are on the l...New mathematical model to add rigor to studies of disease genetics and evolution
...netic recombination. During the creation of new sperm or egg cells, paired chromosomes line up and excha...d that uses the painstaking but powerful method of sperm typing to study genetic recombination. He and others have shown that some hotspots are heterogeneous...Link between beef consumption during pregnancy and reduced sperm quality in sons
... had sons who were more likely to suffer from poor sperm quality as adults, and it suggests that the growth...others ate more than seven beef meals a week had a sperm concentration that was over 24% lower than in men whose mothers ate less beef. In addition, three ti...Maternal beef diet could impact sperm counts, UR study suggests
...nsumption while pregnant was associated with lower sperm counts in her son, according to a study led by res...lts revealed a significant link between the lowest sperm counts and mothers who were the highest beef consumers (seven or more beef meals per week), research...JCI table of contents -- April 5, 2007
...wn as B cells and in meiosis, the process by which sperm and eggs are produced. In the study, which appea... compared with these organs in normal mice. In the sperm cell precursors this was, in part, because the X and Y sex chromosomes failed to pair up and because...Researchers find gene mutation that causes infertility in male mice
...ein involved in meiosis, the process that produces sperm and egg cells for reproduction. These sex cells co...Dmc1 that blocks meiosis in its tracks, preventing sperm production. The mutant allele (one version of the pair of genes we inherit from each parent) is domi...Early-stage sperm cells created from human bone marrow
...an bone marrow has been used to create early-stage sperm cells for the first time, a scientific step forwar...at will help researchers understand more about how sperm cells are created. The research published today (Friday, April 13 2007), in the academic journal Rep...Winter flounder on the fast track to recovery
...agues expertly gauge their readiness for releasing sperm and eggs then give the males and females their privacy: "We let the fish spawn on their own," she says, noting that stock enhancement is most effective when the raised fish are as similar as possible to the wild fish they'll ultimately breed with. ...News tips from the Journal of Biological Chemistry
...roductive disorders. When the membranes of the sperm head and egg start fusing and create an opening between them, the sperm cell releases proteins through the opening that activate the egg. This allows the sperm cell to furt...Study of planarians offers insight into germ cell development
...or the study of germ cells, precursors of eggs and sperm in all sexually reproducing species. The planarian Newmark studies, Schmidtea mediterranea, is a tiny creature with a lot of interesting traits. Cut it in two (lengthwise or crosswise) and each piece will regenerate a new planarian, complete with b...'War Between the Sexes': The coevolution of genitalia in waterfowl
...shape has been previously explained as a result of sperm competition. Scientists speculated that sperm from males with a longer phallus had a competitive edge over sperm from those less well-endowed. Thi...Salk scientist Ursula Bellugi elected to National Academy of Sciences
...ulty recombination event during the development of sperm or egg cells. As a result, almost invariably the same set of about 20 genes is deleted from one copy of chromosome seven, making Williams syndrome a unique model system to study how a genetic predisposition interacts with the environment to sculpt th...First research to show that diabetes damages DNA in men's sperm and may affect fertility
Scientists have found that sperm from diabetic men have greater levels of DNA damage than sperm from men who do not have the disease. They warn that such DNA damage might affect a mans fertility. ...Researchers learn more about genetic mutation linked to autism
...at contributes to autism. The mutation occurred in sperm cells of a father, who does not have autism, but p...meaning the deletion occurred only in the father's sperm cells when he himself was in gestation. As result, the father did not have autism, but his two child...Research suggests men's sexual behavior adapts to perceived threats
... indicate that males have evolved to deliver their sperm more effectively to females with multiple partners. "Although many people are familiar with the idea of animals competing for mates before sex occurs, through mating displays such as bright feathers or butting antlers, we are finding more evidence ...Sheep offer model for undernourishment in pregnant teen girls
...ewe by implanting a single egg fertilized with the sperm of just one male sheep. The control group of animals received an optimal diet for maintaining their pregnancies. Ewes in the experimental group were provided a diet that sustained their bodyweight at the time they became pregnant; as a result, the...Cigarette smoke alters DNA in sperm, genetic damage could pass to offspring
...t smoking can cause changes in the DNA sequence of sperm cells, alterations that could potentially be inher...re mouse or man, generate a constant supply of new sperm from self-renewing spermatogonial stem cells. Yauk, along with colleagues at Health Canada and McMas...Studies to find better ways to preserve human eggs, ovarian tissue under way
...hniques, used successfully for decades to preserve sperm and embryos, to a more rapid method of cryopreserv...Slow cooling works well for simple tissue, such as sperm or even embryos, and for blood. In blood, for example, conventional cryopreservation freezes the liq...Children born after PGD as healthy as those born after conventional IVF treatment
...in vitro fertilisation (IVF) with intracytoplasmic sperm injection (where a sperm is injected directly into an egg) is performed, followed by genetic testing of the embryos. Only u...