Duke Ecologist Says Logging Is Creating 'Mahogany Deserts'
...also be regenerated andmanaged in conjunction with shifting agriculture. "I'm sure that's what happened in the past," she said. "Notonly did mahoganies have the benefit of hurricanes and fires. They alsohad the benefit of Mayans who created little openings in the forest andthen abandoned them after they fini...Geologist Finds Evidence Supporting Mysterious Ancient Sea
...were being formed.That indicates the continent was shifting positions at the time." Huff believes the process is very similar to the modern daySouth Pacific where volcanic islands like Borneo and Sumatra arebeing driven toward Asia by plate tectonics. Huff's collaborators include Dennis Kolata of the Illinois...DNA Enzyme Works In Crystal Form; Yields New Insights Into Gene Copying
...f the correct nucleotide the enzyme"translocates," shifting to the next unit, like a stockbroker reading a tickertape. Besides merely copying DNA, the polymerase also exercises exacting qualitycontrol, carefully proofreading its work and halting production the instant itdetects an error, so that repair enzyme...Hopkins Study Reveals Key Details On How We Get Energy
...the "stem" rotates, it creates a powerful internal shifting in eachof the three coiled sections within the cap. This shifting provides the energyto cause chemical changes. At one site, the "ingredients" for ATP come together. ...Scientists Show That Normal-looking Cells In Cervical Cancer May Be Abnormal
...d techniques for diagnosing andtreating cancer, by shifting the definition of a cancer cell from the currentone-which is based on the morphological features of a cell-to one based onchemical changes picked up by infrared spectra." Doctors usually depend on the Pap test as a method to detect cervical cancer an...Protestors Are Up In Arms Over Experiments That Give Chimps AIDS
... HIV infection arefading, however, so attention is shifting towards vaccines that might slow theprogression to AIDS. These could be tested in chimps infected with the lethalstrains. The alternative-going straight into tests on people with HIV-iscomplicated by the widespread use of anti-retroviral drugs, which......ediment -- a fluid, green ooze easily suspended in shifting ocean currents. Schulzspeculates that Thioploca 's vertical sheaths aren't well-supported in suchooze, whereas the balloon-like Thiomargarita bacteria can float passively,storing sulfur until they happen to be brought into contact with the nitrate...Earliest Modern Tree Lived 360-345 Million Years Ago
...s off the ancientcoastline but were now exposed by shifting desert sands. In 1991, Wendt reported his findings in a paper published in the Journal Faciesand included photos of a 16-foot long (5m), four- to five-inch diameter tree anda cross section of that tree. The Paleozoic team of the Institut de l'Evolu...Center For Future Health Aims To Bring High-Tech, Low-Cost Health Care To The Home
... "We're developing new technology with the goal of shifting the focus ofmedicine from treating and curing patients, to preventing disease," saysPhilippe Fauchet, center director. "There are groups left and right developingdevices for individual applications, but we're talking about a fundamentalchange in the ...Undiscovered Biological Diversity: A Symposium On Bioprospecting
...ing valuable," saidColwell. "But bioprospecting is shifting scientists toward intensive searchesfor chemical products that would have been subtle or difficult to detect." Bioprospectors look to nature to get a head start on developing usefulproducts. "The natural world has spent a long time experiment...Embryos that implant in uterus 'late' prove more likely to die in first weeks of pregnancy
...y had been pregnant. Only daily urine testing for shifting traces of ahormone called hCG confirmed these pregnancies and their loss. The 25 percentearly loss, when added to the clinical miscarriages that occur later, means thatat least one-third of all embryos fail. Today, the researchers reported t...Dinosaur fossils reveal evolution's big picture, says Paul Sereno
...role that major changes ingeography, caused by the shifting of the Earth's tectonic plates, play in theevolution of new species. The dinosaurs are a prime subject for studying thisproblem, because they reached the height of their diversity during the breakupof the supercontinent Pangaea in the early Cretaceou......cells. The membrane moleculesconsistently formed a shifting bull's-eye pattern during the first hour ofinteraction. The final bull's eye pattern, the immunological synapse, formedonly when the correct antigen was present. Both the amount and the quality ofthe antigen were critical in determining whether a T c...First gene defect identified for precursor to adult diabetes
...e in large part becauseits underlying causes are a shifting mix of many factors. "While the expression of some diseases like cystic fibrosis arecontrolled by just one gene, diabetes is likely to be affected by several,"Goldfine says. "Moreover, both insulin resistance and the subsequent developmentof...USGS studies wildfire ecology in the western United States
...ate and fire regime. The historical record shows a shifting matrix of low to moderate-intensity fires, with occasional hot spots of severe fire that open gaps in the forest and clear the way for sequoia regeneration. "The hot spots reduce competition so that the sequoia seedlings have chance," Stephenson says...Eastern U.S. benefits from emissions trading by power plants
Study indicates sulfur dioxide emissions shifting from Northeast to Midwest (The on-line version of the research paper cited below is available on theAmerican Chemical Society's ASAP (As Soon As Publishable) web site. Journalistsdesiring full access to papers at the ASAP site must submit thei...Fall Meeting: updated press conferences and special events
...rctic, warmer winters over Scandinavia and Russia, shifting rainfall patterns, and a thinning of the stratospheric ozone layer and Arctic pack ice may all be linked to the tightening of the Northern Hemisphere wintertime polar vortex that has taken place since 1970. Similar linkages are seen in connection wit...Tube worms in deep sea discovered to have record long life spans
...water. Buthydrothermal vents have a wide range of shifting environments including"black-smoker" chimneys belching out material as hot as 400 degreesCelsius, whereas seeps release the hydrocarbon fluid slowly and dependablyover a long period of time at seawater temperatures. "The chemical content of the fluid...Ancient mediterranean port city may have been holy land way station
...ra Schiff and Chris Laramie were surprised to find shifting sand had uncovered the apse and foundation of a second submerged church since the research team's 1998 visit. Further investigation confirmed all five churches were roughly the same size, said Hohlfelder. He speculated that Lycia, a small region e......rnative version of a single building block of DNA, shifting an adenine (A) to a guanine (G), changing just one of the three billion base pairs that make up the human genome. This minute alteration of the DNA acts in a recessive manner; individuals who inherit two copies of the "G" version have increased risk...