All biologists who sample natural communities are plagued with the problem of how well a
sample reffects a community’s “true” diversity. New genetic techniques have revealed …

A workgroup formed by the Society for Research on Nicotine and Tobacco reviewed the
literature on abstinence measures used in trials of smoking cessation interventions. We …

Reports of illness resembling meningococcal disease date back to the 16th century. The
description reported by Vieusseux in 1805 is generally thought to be the first definitive …

Infants born to hepatitis B virus carrier mothers, who express a secreted form of the nucleocapsid
antigen designated HBeAg, invariably become persistently infected. To investigate the …

Natural occurrences of ground water with moderate (10 to 50 micrograms per liter) to high (greater
than 50 micrograms per liter) concentrations of arsenic are common throughout much …

METHODS In the Liestal and Freiburg series the closed treatment was handled by the usual
methods of closed reduction and cast immobilization. Simpler type A fractures were treated …

Background A worldwide outbreak of severe acute respiratory syndrome (SARS) has been
associated with exposures originating from a single ill health care worker from Guangdong …

We report the draft genome sequence of the model moss Physcomitrella patens and compare
its features with those of flowering plants, from which it is separated by more than 400 …

The nucleocapsid (HBcAg) of the hepatitis B virus (HBV) can induce antibody responses via
both a T-cell dependent and a T-cell independent pathway 1 and is highly immunogenic …

Technologies to measure whole-genome mRNA abundances 1, 2, 3 and methods to
organize and display such data 4, 5, 6, 7, 8, 9, 10 are emerging as valuable tools for systems-level …