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(1)本统计选择的代表性综合类科技期刊包括Nature、Science、PNAS和Nature Communications等4种。(2)2012年中国大陆科研机构共在所选综合类科技期刊发表研究论文425篇(其中Nature发表51篇、Science发表49篇、PNAS发表249篇、Nature Communications发表76篇)。发表论文篇数比2011年增加115篇,位居历年第1位;占2012年所选综合类科技期刊刊载研究论文总数的份额为6.85%,比2011年增加1.48个百分点,位居
(1) The selected comprehensive science and technology journals selected by this statistics include Nature, Science, PNAS and Nature Communications. (2) In 2012, research institutes in Mainland China published 425 research papers (51 in Nature, 49 in Science, 249 in PNAS and 76 in Nature Communications) in selected comprehensive science and technology journals. The number of published articles increased by 115 from 2011, ranking No.1 in the calendar year. The share of the total number of research papers published in comprehensive science journals selected in 2012 was 6.85%, an increase of 1.48 percentage points from 2011, ranking the top