Sigma-Aldrich continues to make the Acta more useful and accessible to scientists around the world

ST. LOUIS, July 15 /PRNewswire-FirstCall/ -- Sigma-Aldrich (Nasdaq: SIAL) is proud to announce that its highly acclaimed chemistry review journal, Aldrichimica Acta, has again been ranked #1 by Impact Factor, out of 56 similar journals in the field of Organic Chemistry. In 2007, the latest year for which such rankings are available, the Acta achieved an Impact Factor of 11.929. The Acta was also ranked #1 in 2006 and 2005. These rankings appear annually in the Science Edition of Journal Citation Reports(R) (JCR), which is published by Thomson ISI(R). JCR, Science Edition, tracks close to 5,900 international science journals annually and offers quantifiable statistical data, which allows the systematic and objective ranking of journals by relative importance within their subject categories.

The Aldrichimica Acta publishes in-depth reviews on topics of current interest to chemists. It is published four times a year and distributed at no charge to about 130,000 subscribers worldwide who are members of the scientific community.

'We are extremely proud of this latest ranking of the Acta by ISI(R),' said Dr. Sharbil Firsan, Aldrichimica Acta Editor. 'In particular, we are very pleased with the significant increase in Impact Factor reported. Both are a clear indication of the high regard in which our fellow chemists hold the Acta, and of its continued value to them. We continually strive to make the Acta even more useful and accessible to scientists and technologists around the world. As an example of that, all issues of the Acta that have ever been published, together with a useful index of reviews and authors, are available on our website free of charge, and will soon be available, also free of charge, on an interactive CD-ROM.'

Subscription information and all issues dating back to 1968 are available online at http://www.sigma-aldrich.com/acta and will soon be available on CD.

*ISI and Journal Citation Reports are registered trademarks of The Thomson Corporation.

About Sigma-Aldrich: Sigma-Aldrich is a leading Life Science and High Technology company. Its biochemical and organic chemical products and kits are used in scientific and genomic research, biotechnology, pharmaceutical development, the diagnosis of disease and as key components in pharmaceutical and other high technology manufacturing. The Company has customers in life science companies, university and government institutions, hospitals, and in industry. Over one million scientists and technologists use its products. Sigma-Aldrich operates in 36 countries and has 7,900 employees providing excellent service worldwide. Sigma-Aldrich is committed to Accelerating Customer Success through Leadership in Life Science, High Technology and Service. For more information about Sigma-Aldrich, please visit its award-winning Web site at http://www.sigma-aldrich.com.

SOURCE Sigma-Aldrich