News Articles

When administered in lethal levels, antibiotics trigger a fatal chain reaction within  bacteria that shreds the cell's DNA. But, when the level of antibiotic is less than lethal the same reaction causes DNA mutations that are not only survivable, but actually protect the bacteria from numerous antibiotics beyond the one it was exposed to, says a new study recently published in Molecular Cell. The findings underscore the potentially serious consequences to public health of administering antibiotics in low or incomplete doses.

An analysis of available research on the topic (three studies) suggests that eating choclate may reduce your risk of stroke. Chocolate is rich in antioxidants called flavonoids, which may have a protective effect against stroke, but more research is needed, concluded the analysis that will be presented at the American Academy of Neurology's 62nd Annual Meeting in Toronto April 10 to April 17, 2010.  The first study found that 44,489 people who ate one serving of chocolate per week were 22 percent less likely to have a stroke than people who ate no chocolate. The second study found that 1,169 people who ate 50 grams of chocolate once a week were 46 percent less likely to die following a stroke than people who did not eat chocolate.

Data collected on speleothem encrustations, a type of mineral deposit, in coastal caves on the Mediterranean island of Mallorca indicate that sea level was about one meter above present-day levels around 81,000 years ago. The finding challenges other data that indicate sea level was as low as 30 meters below present-day levels. Theories about the rates of ice accumulation and melting during the Quaternary Period may need to be revised as a result of the findings, which appear this week in Science.The sea level high stand of 81,000 years ago was preceded by rapid ice melting, on the order of 20 meters of sea level change per thousand years and the sea level drop following the high water mark, accompanied by ice formation, was equally rapid.

Arizona State University researchers have developed the first versatile DNA reader that can discriminate between DNA's four core chemical components, the key to unlocking the vital code behind human heredity and health. If the process can be perfected, DNA sequencing could be performed much faster than current technology, and at a fraction of the cost.

Depicting a cause-and-effect scenario that spans thousands of miles, scientists report in Geophysical Research Letters that ocean waves originating along the Pacific coasts of North and South America could play a role in the catastrophic collapse of Antarctic ice shelves.Storm-driven ocean swells travel across the Pacific Ocean and break along the coastlines of North and South America, where they are transformed into very long-period ocean waves called "infragravity waves." The transformed waves then travel vast distances to Antarctica.

The Visible and Infrared Survey Telescope for Astronomy (VISTA), the latest addition to ESO's Paranal Observatory (eso0949), has captured a dramatic new image of the Orion Nebula. The New telescope is the largest survey telescope in the world and is dedicated to mapping the sky at infrared wavelengths.

Contradictions and puzzles surround Prototaxites, organisms that existed during the Late Silurian to Late Devonian periods-- approximately 420-370 million years ago (ma). The existing fossils resemble tree trunks, yet they are from a time before trees existed. The stable carbon isotope values are similar to those of fungi, but the fossils do not display structures usually found in fungi. Plant-like polymers have been found in the fossils, but nutritional evidence supports heterotrophy, which is not commonly found in plants.

Although it is well established that all behaviors and experiences, spiritual or otherwise, must originate in the brain, information on the causative link between brain activity and spirituality is lacking. Neuroimaging studies have associated activity within a large network in the brain that connects the frontal, parietal, and temporal cortexes with spiritual experiences, but researchers have been unable to establish a causative relationship between such a network and spirituality. In order to establish that relationship, researchers studied the personality trait self-transcendence (ST), which is thought to be a measure of spiritual feeling, thinking, and behaviors, in patients before and after surgery to remove a brain tumor.

Researchers have isolated an independent processing channel of synapses inside the brain's auditory cortex that deals specifically with shutting off sound processing at appropriate times. The discovery, detailed this week in Neuron, challenges a long-held assumption that the signaling of a sound's appearance and its subsequent disappearance are both handled by the same pathway. The new finding could lead to new, distinctly targeted therapies such as improved hearing devices, said Michael Wehr, a professor of psychology and member of the University of Oregon Institute of Neuroscience.

An international team of climate scientists say they have developed a new approach to modeling the earth's climate that will improve the accuracy of future models utilized by the IPCC and provide the framework for thousands of individual scientific studies on climate impacts and adaptation, and changes in the way societies generate and use energy.Previous scenarios used by the IPCC usually assumed that no one would try to reduce climate change. Today, policymakers and researchers are interested in exploring ways to limit changes. Understanding the impacts and interactions of activities such as increasing energy efficiency and conservation, developing new renewable fuels to replace fossil-based fuels, and regulating how land is used are crucial to better decision-making.

The authors of a new study published in Human Communication Research say that the media is losing some its ability to sway viewers on important social issues. Specifically, the study shows that the 'OC', a crummy drama series about teens and their turbulent lives in southern California, may be more effective in persuading young women to use birth control than a news-format program on the same issue.The results show the power that narratives like TV shows can have in influencing people, said Emily Moyer-Gusé, co-author of the study and assistant professor of communication at Ohio State University.

A new commentary just published in the Proceedings of the National Academy of Sciences claims that more evidence is mounting that birds did not evolve from ground-dwelling theropod dinosaurs and challenging decades of accepted theories about the evolution of flight.The weight of the evidence is now suggesting that not only did birds not descend from dinosaurs, but that some species now believed to be dinosaurs may have descended from birds, according John Ruben, a professor of zoology at Oregon State University who authored the PNAS commentary.