Does natural selection drive the evolution of cancer?
...ells. This is the central problem in oncology. The reason we haven't been able to cure cancer is that we're selecting for resistant tumor cells. When we spray a field with pesticide, we select for resistant pests. It's the same idea." Maley notes that there are three necessary and sufficient conditions fo...Setting the stage to find drugs against SARS
...ses are excellent targets for antiviral drugs. One reason so many people are surviving the AIDS epidemic is the effectiveness of drugs targeted to the proteinase of human immunodeficiency virus (HIV)." One way to obtain compounds that bind to a proteinase is via high-throughput screening. Chemical librar...Fires in far northern forests to have cooling, not warming, effect
...atively quickly, within 10 to 15 years. The main reason was that the first trees to replace the burnt conifers were aspen, birch and other deciduous trees, with large light-green leaves. These leaves reflected more of the sun's energy than did the dark green, thin-needled black spruce, and as a result, le...Exposure to dioxins influences male reproductive system, study of Vietnam veterans concludes
...d hypospadias (abnormality of the urethra). The reason for this increase is not known, but it is thought that these disorders might be caused by environmental chemicals that are estrogenic and have endocrine-disrupting effects, Dr. Gupta said. Dioxins are among the most toxic substances known and are t...DNA repair teams' motto: 'To protect and serve'
...ads to cancer," explains Karlseder. In fact, the reason that telomeres, which are synthesized by an enzyme known as telomerase, exist is to assure that chromosome ends remain intact through a lifetime of cell divisions. When asked if there are cancers in which telomerase activity goes awry, Karlseder answ...Boehlert, Gordon call for implementation of new nanotechnology report
...he status of this research. There is absolutely no reason that those same agencies and the White House should not now quickly put together a plan and a budget to implement the recommendations in the Nature paper as part of the fiscal 2008 budget. "There is too much at stake to continue to dally. Nanotech...Diet can provide protection against development of certain cancers, new studies show
...dden cardiac death, and this might provide another reason to add fish to your diet," said Megan Phillips, a doctoral student at the Harvard School of Public Health and the lead author of this study. The researchers believe the health effects of fish consumption in relation to colorectal cancer may lie in ...The Milky Way shaped life on Earth
...and exceptionally high productivity. The suggested reason is that, although ice is unfriendly to life, winds are stronger when the world is cold. By stirring the oceans, they improve the supply of nutrients in the surface waters so much that productivity can be higher than in a warm climate. And this, in ef...Ludwig Fund donates $20 million to University of Chicago for cancer research
...rocess to completion once it has started. "One reason metastasis is so deadly," Greene said, "is because it is frequently associated with treatment resistance." As an initial focus, researchers at Chicago will search for novel ways to take advantage of steroid hormones and their receptors to detect met...Researchers to present advances in energy, health, technology at chemical engineering conference
...s or electric batteries. A significant part of the reason fuel cells are not more competitive is because they require moving small quantities of liquid fuel, water and air through labyrinths of tiny channels either to or from reaction sites. One solution, Santiago says, could be to incorporate small ''elect...Sea urchin genome is a biology boon and a computational feat
...a model system for developmental biology was a key reason for sequencing its genome. "We've already learned an enormous amount from the sea urchin, from something as basic as how identical twins form to in vitro fertilization procedures," Wessel said. "With a complete map of the urchin's DNA, we can now l...Varied diet of early hominid casts doubt on extinction theory, says Colorado U study
... believe is that we need to seriously re-think the reason behind the ultimate fate of Paranthropus," said Sponheimer. "This 'who done it' or 'what done it' mystery is not likely to be resolved any time soon."...A prickly subject: The sea urchin genome is sequenced
... long had a strong fan base among scientists. One reason it was chosen for the genome-sequencing project is...or inherited material for an organism. One reason sea urchins have been so popular with scientists is that they are easy to work with. They can live ...Low levels of neurotransmitter serotonin may perpetuate child abuse across generations
...een mothers and daughters. "We didn't know if the reason that the babies grew up to be abusive was that they watched how their mothers parented and repeated their behavior or whether their early experience produced long-term changes in brain processes that regulate emotions. We also noticed that about hal...Low folate diets found to increase risk of colorectal cancer
...t against heart disease. "Obviously, this is not a reason to consume excessive amounts of folate, but rather to ensure that the recommended daily amount is taken through a healthy diet or a vitamin supplement," noted Dr. Rozen. The benefits of a high folate diet have been known for many years. Both the US a...Funnel in the eye: Signal focusing increases photosensitivity
...ignificantly boosts the sensitivity even more one reason why people developing digital cameras are fond of using it. In poor light they frequently merge several pixels in one, thereby increasing the sensitivity of the CCD chip. Funnel in the eye Until recently it was not known exactly how this merging......tivate such a cardiogenic environment is a primary reason why zebrafish, as opposed to other laboratory models, effectively regenerate [heart muscle]," the researchers concluded. Indeed, they added, mammalian hearts typically show insufficient blood vessel growth after a heart attack. "Experimental attempt...More species in the tropics because species have been there longer
...e in the tropics (perhaps more than half), but the reason has been debated for more than 100 years. Many researchers have hypothesized that climatic factors somehow cause species to originate more quickly in tropical regions. In a paper appearing in the November issue of The American Naturalist, John Wie...Biological clock of honey bee more similar to humans than to insects
...cial regulation of the circadian clock. Another reason that research on the evolution and function of clock genes is important, is that these genes are involved in a variety of illnesses, such as mental disturbances, alcoholism, problems of overweight and drug addition, as well as in processes relating t...Winnie the Pooh thought the only reason for being a bee was to make honey, but CSIRO Entomology scientists with their Australian and international colleagues have shown there's much more to bees. The findings from the Honey Bee Genome Sequencing Project are published today in 'Insights int...