Sigma-Aldrich
Manufacturer of laboratory reagents in all fields of life sciences, including biochemistry, molecular biology, cell culture and cell biology.
http://www.sigmaaldrich.com/
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chemicals
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supplier
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The National Academies: Advisers to the Nation on Science, Engineering, and Medicine
Private, nonprofit society of scholars engaged in scientific and engineering research, dedicated to the furtherance ... the National Academies. Directories ...
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science
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technology
government
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medicine
engineering
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Social Science Research Network (SSRN) Home Page
Leading Social Science Research Delivered To Your DeskTop Daily. Social Science Research Network (SSRN) is devoted to the rapid worldwide dissemination of social ...
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science
economics
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social
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CiteULike: A free online service to organise your academic papers
Citeulike SVN Server. To check out the source code: svn co http://svn.citeulike.org/svn citeulike ...
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research
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academic
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web2.0
bibliography
tagging
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Welcome to the USGS - U.S. Geological Survey
Official site of the USGS.
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science
geology
maps
reference
geography
government
usgs
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environment
gis
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Proceedings of the National Academy of Sciences
Multidisciplinary journal that covers the biological, physical, and social sciences, publishing research reports, commentaries, reviews, colloquium papers, and actions of the Academy.
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science
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HighWire Press
No information avaiable
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science
reference
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scienceandtechnology
journals
academic
journal
highwire
health
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Frank Potter's Science Gems
Annotated links to multimedia science gems sorted by subtopic and grade level.
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science
resources
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education
physics
teaching
research
math
biology
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Journal home : Nature
Nature is the international weekly journal of science: a magazine style journal that publishes full-length research papers in all disciplines of science, as well as ...
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science
nature
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journals
news
magazine
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奇迹文库:开放的知识库
qiji.cn. arxiv.org. answers.com ... qiji.cn. arxiv.org. answers.com. 豆瓣小组: 奇迹 奇迹翻译计划 自然科学史. 集智俱乐部. 百科资料: 医疗 饮食 理财 旅游 艺术 历史 文学 军事 生活 科学 ...
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奇迹文库
resources
book
research
study
knowledge
books
科学
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CiteSeerX
Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar ...
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science
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