Question: where are US-American universities in the list of top-affiliations?

  An interesting question has arrived after the release of the first two posts on 'Some indicators on Sudanese research output', and it is related to the US-American institutions missing the top 20 list of ISI journal papers affiliations for the period 2006-2011. The question reads: "If you say the US are the top country with regard to co-authorship with Sudanese institutions (n=147), then how come there's no US-based university in the posted 2006-2011 list of author affiliations?".

Political considerations aside, the answer may well be: dispersion. The US are a huge country with a very large number of Higher Education and Research institutions, so even when the co-authorship with the whole set of them tops the list, there is no individual institution that will make the top places on the affiliation list. Here is a list of US-American universities and research centres featured in the global 2006-2011 list of affiliations top-100:

1. UNIV KHARTOUM 675
2. SUDAN UNIV SCI TECHNOL 99
3. UNIV GEZIRA 62
22. SETI INST 18
32. NASA 14
43. CARTER CTR 11
50. UNIV MARYLAND 10
65. CARNEGIE INST WASHINGTON 8
73. EMORY UNIV 7
88. FORDHAM UNIV 6
92. JOHNS HOPKINS UNIV 6
96. UNIV OKLAHOMA 6

Next posts on this series will deal with most popular ISI journals and subject in which Sudanese authors publish their papers, and the situation of Sudanese research output with regard to neighbour African countries.