PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES

The '''Proceedings of the National Academy of Sciences of the United States of America''', usually referred to as '''PNAS''', is the official journal of the United States National Academy of Sciences. ''PNAS'' is an important scientific journal that printed its first issue in 1915 and continues to publish cutting-edge research reports, commentaries,[1] reviews,[2] perspectives,[3] colloquium papers,[4] and actions of the Academy.[5] Coverage in ''PNAS'' spans the biological, physical, and social sciences. Although most of the papers published in the journal are in the biomedical sciences, ''PNAS'' recruits papers and publishes special features in the physical and social sciences and in mathematics.[6] ''PNAS'' (abbreviated ''Proc Natl Acad Sci USA'' for referencing and indexing purposes) is published weekly in print, and daily online in ''PNAS'' Early Edition.[7]

Contents

Impact

External links

Impact

''PNAS'' is widely read by researchers, particularly those involved in basic sciences, around the world. The journal is notable for its policy of making research articles freely available online to everyone 6 months after publication (delayed open access), or immediately if authors have chosen the "open access" option (hybrid open access). Immediately free online access (without the 6-month delay) is provided for 144 developing countries and for some categories of papers such as colloquia. Abstracts, tables of contents, and online supporting information are free. Anyone can sign up to receive free tables of contents by email.[8]
Because ''PNAS'' is self-sustaining and receives no direct funding from the government or the National Academy of Sciences, the journal charges authors publication fees to help offset the cost of the editorial and publication process.
The journal's impact factor for 2004 was 10.452, for 2005 was 10.231, and 2006 was 9.643 (as measured by Thomson ISI). ''PNAS'' is the second most cited scientific journal with 1,338,191 citations from 1994–2004 (the ''Journal of Biological Chemistry'' is the most cited journal over this period with 1,740,902 citations in total).

External links

★ PNAS website