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Science News for January 5, 2004


Enzyme fully degrades mad cow disease prion

A bacterial enzyme keratinase has been found to fully degrade transmissible prions responsible for bovine spongiform encephalopathy and other diseases. Researchers plan to test its effectiveness in mice to confirm non-infectious levels of prion after degrading it to undetectable levels in vitro.

SourceNorth Carolina State University·JournalThe Journal of Infectious Diseases·DateJan 5, 2004

Study looks at students' drinking misperceptions, behavior

A study at a medium-sized northeastern university found that social norms campaigns did not change students' behavior, but perceptions of friends' drinking had a significant impact on their own drinking behavior. Educational efforts should focus on teaching responsible drinking habits rather than relying solely on social norms.

SourceUniversity of Iowa·JournalHealth Communication·DateJan 5, 2004

Methamphetamine withdrawal associated with brain changes seen in mood disorders

Researchers discovered that methamphetamine withdrawal is associated with significant brain changes in individuals with mood disorders. The study used PET scans to compare glucose metabolism in the brains of methamphetamine abusers and non-abusers, revealing lower glucose levels in regions linked to depressive disorders.

SourceNIH/National Institute on Drug Abuse·JournalArchives of General Psychiatry·DateJan 5, 2004

Study on toxic exposures in urban environments

Researchers at Columbia University discovered that steel dust from NYC subways contains elevated levels of iron, manganese, and chromium, exceeding 100 times those found in indoor or outdoor settings. The study suggests that subway platforms are a primary source of exposure to these metals.

SourceColumbia Climate School·JournalEnvironmental Science & Technology·DateJan 5, 2004