UB Fertility Researchers Find They Can Predict Pregnancy By Assessing Two Sperm Abnormalities
..., we knew that the partner's sperm were capable of fertilizing the egg," Burkman said. "When pregnancy did not occur, the possibility existed that the sperm failed at one or more points in the fertilization process." For this study, researchers analyzed semen samples from 250 consecutive patients who came ...First Reproducible Cloning Of Mammals From Adult Cells Reported In Nature
...ond step typicallyoccurs with the stimulation of a fertilizing sperm. In the study, the insertion of the donor nucleus preceded the secondmaturation step, and the scientists delayed this maturation anywhere fromone to six hours. This delay increased the likelihood that when the oocytecontinued its maturation, a...Horseshoe crab studies providing new insight into valuable ancient creatures
...release/1999/6-8c.tif (Horseshoe crabslaying and fertilizing eggs. Photo courtesy of Bill Hall. ) They look like props from the movie Jurassic Park, but these ancientorganisms were around long before the dinosaurs. Some of their closestevolutionary relatives have been extinct for hundreds of millions of years....How a gene tells plant to reject its own pollen
...lination, then the stigma prevents the pollen from fertilizing egg cells. This mating, or self-incompatibility, type is determined by that single address on the plant's genome, the S locus. "Flowering plants have developed various mechanisms to avoid the fertilization of their ovules by their own pollen, fav...Brain neurochemicals, not gender, tell a female to act like a female
...e organs; and the type II males' habit of sneakily fertilizing eggs left for the type I males. Also attracted to all the singing, grunting and sexual shenanigans are opportunistic biologists, eager to analyze an animal system with a third, intermediate gender -- the type II males -- and with behaviors that are...Proteins that bind to sperm offer clues to male fertility and possible male contraception
...me as not essential for the development of sperm's fertilizing ability. "Now it's known that sperm that have not passed through the epididymis fertilize an egg very poorly if at all. And after they pass through, they're more ready to fertilize an egg," said Susan Hall, PhD, research assistant professor of pedia...Changes in North American land use have had major impact on global environment
...dies had suggested that other factors, such as the fertilizing effects of carbon dioxide, were spurring forests to absorb more carbon dioxide. "Changes in the way we manage our land have had a real impact on the global environment," said the paper's lead author, John Caspersen. The finding makes it clear, howe...Insects caught in a nutrient-poor food web
...ve important implications for agriculture. Farmers fertilizing their crops get the benefit of producing nutrient-laden, fast-growing plants. But their nitrogen- and phosphorus-rich crops are more attractive to pest insects seeking high-quality diets. It might be possible for farmers to minimize crop losses to in...Sex lives of wild fish: Genetic techniques provide new insights
...tion of monogamy and biparental care in externally fertilizing vertebrates." DeWoody says such advances in the ecology of fish and wildlife is only possible because of advances in genetic techniques. "Genetics in fish and wildlife is always 10 years behind what it is in humans, he says. "But we would not have ...Muddy waters: letting the Gulf of Mexico breathe again
... typically begins in the spring, when planting and fertilizing fields peaks. The accumulation of nitrogen and other chemicals usually reaches a maximum in midsummer and disappears in the fall, Mitsch said. While the size of the zone varies from year to year, it has encompa...Scientists chart iron cycle in ocean
...rch grew partly from early studies indicating that fertilizing the oceans with iron could stimulate the growth of plant life that consume carbon dioxide, and thereby counteract global warming. In those studies, iron dropped from ships encouraged phytoplankton to bloom profusely, but only for a short time. ...MIT prof: Oceans at risk if policy tool not restricted
...technique for removing atmospheric carbon involves fertilizing the oceans. "Our objections are to commercialized ...xperiments over the last ten years have shown that fertilizing parts of the ocean increases the number of tiny organisms, or phytoplankton, that remove carbon diox...Efficient fertilizer use could benefit river without hurting crop yields
...ractices," David said. Among those, he added, are fertilizing for five-year average corn yields not maximum yield and counting all forms of applied nitrogen such as manure and credit from soybeans and other legume crops.The full effect of reducing nitrogen fertilizer application to UI-recommended levels would...Media Advisory 2 - 2002 Ocean Sciences Meeting: press conferences scheduled
...of a proposal to store carbon in the deep ocean by fertilizing plankton living near the surface of the ocean. Lara Hansen will discuss political, legal and ethical aspects of ocean carbon storage. Participants: James P. Barry, Associate Scientist, Monterey Bay Aquarium Research Institute (MBARI), Moss Landing,...Chinese tallow tree invades Texas prairies
...sion. Another study involves examining the effect fertilizing with nitrogen has on the trees growth. "Prairie grass is very efficient at using nitrogen, and the tallow tree uses nitrogen very inefficiently," Siemann said. Because the Chinese tallow trees are starting to sprout in the forests of East Texas, S...Can we learn about sex from animals?
... to actively manage the sperm of each of them when fertilizing their eggs, instead of to the domineering male baboons that herd females with the threat of violence. I greet these discoveries, and their emphasis in the media, with mixed emotions. Is this really where we want to go? Do we want an escalating arg...Razing old dams solves some problems, creates new ones
...o fertilize crops enter these systems, they end up fertilizing them, too," says Stanley. Too much phosphorous and nitrogen in the water can create algae blooms, which turn the water green. Dams, however, prevent most of these nutrients from flowing downstream. As Stanley explains, each structure forms a reservo...Sex and genetics: Why birds are unfaithful to their partners
...extra-pair male might have a much higher chance of fertilizing an egg when pair members are closely related....Asian dust storm causes plankton to bloom in the North Pacific
... direct observation of wind-blown terrestrial dust fertilizing the growth of aquatic plant life. A group of scie...s in his "iron hypothesis," which proposed that by fertilizing plankton growth with iron, global warming could be offset. Iron fertilization can indeed cause plank...Scripps research gives tiny phytoplankton a large role in Earth's climate system
... have held that global warming may be decreased by fertilizing the oceans with iron, which would lead to an increase in the ocean's biological pump. Through such an increase, the argument holds, phytoplankton would be able to draw carbon dioxide out of the atmosphere and therefore reduce global warming. Frouin a...