Stem cells toward sperm cells and back again
...e whether lost stem cells could come back, Brawley put the temperature-sensitive fruit flies in warmer climes of 29 degrees Celsius (a balmy 84 degrees Fahrenheit) for two days, and discovered that only 22 percent of testes still contained sperm-making stem cells. After four days, almost no stem cells re...Study in flies allows researchers to visualize formation of a memory
...ram director at NINDS. The researchers now plan to put fluorescent genes into a variety of other neurons of the brain in order to determine which ones respond to different kinds of stimuli. This will allow them to learn how the changes they identified affect higher-level neurons. They also hope to begi...Whales, seals or men? Who stole all the fish?
...otential for competition seems enormous. Estimates put the amount of fish eaten by marine mammals worldwide at more than 800 million tonnes annually, or roughly 10 times the worldwide ocean fish harvest, says Kristin Kaschner, a marine biologist at the University of British Columbia (UBC) in Vancouver. ...Dramatic decline of California native frog linked to introduced trout in mountain lakes
...g populations have declined dramatically enough to put it on the endangered species list," said Vredenbur... feet is that they couldn't get there, so when you put them in at the top of the watershed, they swim downstream and really alter the ecosystem." Vredenbur...Domesticated tree crops may be the 'future of forestry'
...eeding. "With houseplants, you can take a cutting, put it in water, and it will root. That's called vegetative propagation," Meilan said. "You can't do that with most trees. If you take a branch off of a walnut tree and stick it in water, it won't develop roots. We'd like to find the genes that cause roo...Sediments in many Central Valley streams contain toxic levels of pyrethroid pesticides
... out because of environmental concerns), or they'd put it down to 'unknown causes,'" Lydy said. "Where our study is unique is that we looked at the toxicity and tried to figure out what was actually causing it. We detected organochlorines, such as DDT and chlordane, in the sediments, but at concentration...Insulin-producing pancreatic cells are replenished by duplication
...on and his colleagues knew that they could finally put such questions to rest if they could tag beta cells in such a way that that they could determine unequivocally whether the new cells were made from existing beta cells or from a different reservoir of stem cells. For these studies, they devised a "ge...ESA's minature Earth observer put to many uses
...CHRIS performed well above expectations, and so we put out an Announcement of Opportunity for scientists interested in making use of CHRIS data. Some 60 different groups responded, and we are hearing about their projects during this event." Looking at life on land CHRIS's ability to retrieve hyperspe...Teachers turn to Tolkein to explain physics
... [for] we get more out of them than was originally put into them". Crease's own view is that the greatest equations tend to be those dealing with fundamental properties like space, time and energy. The results of his readers' poll will be reported later in the year. Results will be issued in an embargoe...University of Michigan symposium charts course for the future of telemedicine
...2, 2004, in Ann Arbor, Michigan. Participants will put a number of issues under the microscope. These include: Synthesis of the evidence from telemedicine evaluation studies, with a special focus on scientific validation now, and in the future Review of methods for measuring costs and benefits for ...Chlamydia in men now also linked to infertility new findings
...ugh IVF, infection or Chlamydia antibodies did not put the pregnancy at risk as there was no difference in the outcome of the pregnancies between IgG positive or negative couples. (150 of the 244 couples achieved pregnancy 58.7% spontaneously and 41.3% via treatment). The finding that infection or the p...New research finds summer-born women have fewer children
...ldren per woman than those born in December, or to put it another way, 13.4% fewer of the 2.24 mean number per woman overall. It indicates that despite the potential influence of modern life and the use of contraception, birth month effects on later reproductive performance are at least to some degree si......icipated in the trials. "Volunteer support put the threat of polio behind us in 1954, just as volunteer support today is critical in the fight to address premature birth and infant mortality in this country," said Dr. Howse, referring to the foundation's current five-year, $75 million campaign t...Only half of recalled meat and poultry is recovered, study finds
...l points" where risks to the food might occur, and put safety precautions in place to prevent potential h...already in the grocery stores and the stores don't put up big signs about the potential hazard, people might not get the message." But simply allowing the ...Inflammation, hypertension are focus of major new MCG research program
...words animal models that get hypertensive when you put them on a high-salt diet, there seems to be a defect in that pathway," he said. When that pathway is defective and cytokines stimulate even more endothelin, endothelin's bad side predominates: decreased ability to relax blood vessels, decreased blood...Citizens asked to monitor impact of invasive bird species
...strategy for dealing with house sparrows is to not put up a box at all, especially if you aren't willing to discourage their nesting in favor of native species," says Phillips. She also adds that to really make a difference for the birds, becoming part of TBN and sharing observations with researchers is ...The Hunter's Breath tells a story of adventure and discovery in Antarctica
...but the results were riveting. "When we put that first videotape in the VCR, it was the most a...em," she said. In her book, however, Williams put less emphasis on the conservation aspects of her work and more on the pure excitement of the science......reliably push the genes through the population. To put genes into an insect, scientists use a mobile piece of DNA called a transposon. Transposons are essentially DNA parasites that snip themselves in or out of the genome under the right circumstances. Scientists can add a new gene into a transposon and ......" "Dr. Oates is a legend in Clinical Research. He put Vanderbilt's clinical research on the map, and I was personally excited to propose him for this award, and gratified that others recognized, as we do, his enormous contributions," said Alastair Wood, M.D., associate dean of external affairs at Vander...