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Science News Archive April 2007 - Page 9


Page 9 of 17

Ancient amphibians evolved a bite before migrating to dry land

Researchers from Harvard University found that ancient aquatic amphibians developed the ability to feed on land before transitioning to terrestrial life. Analysis of skull bones reveals that these extinct animals captured prey by biting or sucking it into their mouth, with one key species showing signs of biting behavior.

SourceHarvard University·JournalProceedings of the National Academy of Sciences·DateApr 16, 2007

Should primary care doctors assess safety of older drivers?

A recent editorial by Dr. Malaz Boustani suggests that primary care physicians should not assess the safety of older drivers due to resource constraints and potential conflicts of interest. The editorial is based on a survey of Canadian family physicians, who reported low confidence in assessing driving fitness.

SourceIndiana University·JournalJournal of General Internal Medicine·DateApr 16, 2007

No sign that ethnic groups' genes cause diabetes, international research team says

The study analyzed existing genetic studies and found that non-genetic factors such as poverty, housing segregation, and poor diet are stronger indicators of diabetes than genes. The findings challenge the widely held thrifty genotype theory, which suggests that certain minority groups are genetically prone to diabetes.

SourceUniversity of California - Irvine·JournalPerspectives in Biology and Medicine·DateApr 16, 2007

Having elevated risk factors in young adulthood raises risk of coronary calcium later on

A new study by NHLBI found that elevated risk factors in young adulthood significantly increase the risk of developing coronary calcium, a predictor of heart disease. Young adults with above-optimal levels of risk factors are two to three times more likely to develop coronary calcium than those with lower levels.

SourceNIH/National Heart, Lung and Blood Institute·JournalJournal of the American College of Cardiology·DateApr 16, 2007

Mailman School of Public Health researchers report blood DNA can be early predictor of liver cancer

Researchers at Columbia University's Mailman School of Public Health discovered a means for early detection of liver cancer using DNA isolated from serum samples. The study found changes associated with cancer in serum DNA one to nine years before actual clinical diagnosis, leading to an overall predictive accuracy of 89%.

SourceColumbia University's Mailman School of Public Health·JournalClinical Cancer Research·DateApr 15, 2007

Blame the brain for high blood pressure

Scientists at the University of Bristol have found that inflammation caused by trapped white blood cells can obstruct blood flow to the brain, leading to poor oxygen supply. This discovery suggests a new mechanism for high blood pressure, with potential therapeutic targets for treatment.