Impact Factor

Journal Impact Factor is from Journal Citation Report (JCR), a product of Thomson ISI (Institute for Scientific Information). JCR provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor is one of these; it is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period.

According to Science Watch, this is the TOP Ten Most-Cited Journals (All Fields), 1999-2009


Rank      Journal Papers
1 Journal of Biological Chemistry 54,695 1,652,432
2 Proc. Natl. Acad. Sci. USA (PNAS) 30,396 1,376,541
3 Nature 10,549 1,242,392
4 Science 9,369 1,125,022
5 Physical Review Letters 31,112 884,911
6 J. American Chemical Society 29,272 881,457
7 Physical Review B 48,888 612,377
8 Astrophysical Journal 26,418 581,299
9 New England Journal of Medicine 3,564 568,698
10 Applied Physics Letters 36,759 549,224

The Content of this page is removed due to copy-right violations. ISI will publish journal impact factor 2012 next year. The latest list of Journal Impact Factors 2011 will be published this year. For more information on "impact factor", go to