Silicic acid limitation drives bloom termination and potential carbon sequestration in an Arctic bloom.

The spring diatom bloom in the Arctic Ocean accounts for significant annual primary production leading to the most rapid annual drawdown of water-column pCO. Late-winter waters in the Atlantic Arctic & Subarctic Provinces (AASP) have lower silicic acid concentrations than nitrate, which suggests diatom blooms may deplete Si before N. Here we test a facet of the hypothesis that silicic acid limitation terminates the spring diatom bloom in the AASP and the sinking of the senescent and dead diatoms helps drive carbon sequestration.

Living with fair use and TEACH: a quest for compliance.

With the expansion of Web-based courses in nursing education, faculty members are faced with a greater responsibility to be copyright compliant. This article reviews the changes in copyright law. The Conference on Fair Use (CONFU), the passage of the Digital Millennium and Copyright Act (DMCA), the passage of the Technology Education and Copyright Harmonization (TEACH) Act, and recent legal cases will be discussed.

The negative impact of the repeal of the Arkansas motorcycle helmet law.

Background: On July 1, 1997, Arkansas became the first state in 14 years to repeal their adult helmet law. We examined the clinical and financial impact of this repeal.

Methods: A 6-year retrospective review was conducted of the University of Arkansas for Medical Sciences trauma registry including the 3 years before and the 3 years after the repeal of the helmet law.