Top institutions in plant and animal sciences

	Institution	Papers	Citations	Citations per paper
1	John Innes Centre, UK	1,134	42,568	37.54
2	RIKEN, Japan	926	25,453	.49
3	Max Planck Society, Germany	2,858	65,851	23.04
4	University of California, San Diego	1,143	25,349	22.18
5	University of California, Berkeley	2,121	43,417	20.47
6	University of Arizona	1,717	31,073	18.10
7	CNRS, France	2,303	33,022	14.34
8	University of Washington	2,226	31,089	13.97
9	Wageningen University	4,083	54,517	13.35
10	University of Cambridge	1,949	25,875	13.28
11	CSIRO, Australia	3,729	49,339	13.23
12	Cornell University	4,912	64,964	13.23
13	Washington State University	2,473	32,544	13.16
14	University of Wisconsin	3,977	52,336	13.16
15	University of Missouri	2,497	30,756	12.32
16	Purdue University	2,673	32,600	12.20
17	INRA, France	6,199	75,164	12.13
18	Michigan State University	3,469	42,055	12.12
19	University of British Columbia	2,539	29,670	11.69
20	Iowa State University	2,682	31,115	11.60

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. This database, currently covering the period January 1999 to December 2009, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and the Thomson Reuters journal-to-category field-definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Naturally, institutions publishing large numbers of papers have a greater likelihood of collecting more citations than those publishing fewer papers.

This ranking is by citations per paper (impact), among those institutions that have collected 25,000 or more citations in plant and animal sciences during the period. For papers with multiple institutional addresses, each institution receives full, not fractional, citation credit. Essential Science Indicators lists institutions ranked in the top 1 per cent for a field over a given period, based on total citations. For the current version, 887 institutions are listed in the field of plant and animal sciences, meaning that a total of 88,700 institutions were surveyed to obtain these results. Of the 887, 40 institutions collected 25,000 or more citations. The ranking by citations per paper (impact) seeks to reveal heavy-hitters based on per paper influence, not mere output. US institutions account for 11 of the 20, followed by two each for the UK and France, and one each for Japan, Germany, the Netherlands, Australia and Canada.

For more information on the Thomson Reuters’ Essential Science Indicators database, see http://scientific.thomsonreuters.com/products/esi