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Serena Williams: 'I don't think about' '09 tirade

NEW YORK (AP) — Chuckling and rolling her eyes, Serena Williams dismissed questions Monday about her tirade at a line judge over a foot-fault call at the end of her loss in the 2009 U.S. Open semifinals.

The 29-year-old American is back at the Grand Slam tournament for the first time since that infamous outburst during a match against eventual champion Kim Clijsters. Williams missed last year's U.S. Open after having surgery on her right foot.

Williams played coy at first during a pre-tournament news conference Monday when she was asked what she remembers most from the way her last U.S. Open ended and how "that controversial episode" might have affected the public's perception …

Nitric Oxide Diffusion Rate is Reduced in the Aortic Wall

ABSTRACT

Endogenous nitric oxide (NO) plays important physiological roles in the body. As a small diatomic molecule, NO has been assumed to freely diffuse in tissues with a diffusion rate similar to that in water. However, this assumption has not been tested experimentally. In this study, a modified Clark-type NO electrode attached with a customized aorta holder was used to directly measure the flux of NO diffusion across the aortic wall at 37�C. Experiments were carefully designed for accurate measurements of the apparent NO diffusion coefficient D and the partition coefficient α in the aortic wall. A mathematical model was presented for analyzing experimental data. It was …