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This study was supported by the Research Corporation under Grant No. GG0066, the Camille and Henry Dreyfus Foundation under Grant No. SG-00-094 and SG-02-025, the National Institutes of Standards and Technology, Grant No. NA1341-01-W-1098, the U.S. Department of Defense under Grant No. MDA-972-01-M-0038, the U.S. Environmental Protection Agency under Grant No. R-82823201, the National Science Foundation under Grant No. CHE-000778, the National Institutes of Health under Contract No. N01-OD-4-2139, and the U.S. Department of Energy under Grant No. DE-FG02-95ER14556. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.
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