PubMed is a database of the U.S. National Library of Medicine (NLM) and the National Institutes of Health. It has been developed by the National Center for Biotechnolgy Information at the NLM, and is available free online. PubMed has approximately 19 million citations.

Web of Science includes Science Citation Index, Social Sciences Citation Index, and Arts & Humanities Citation Index. Web of Science provides "Cited Reference Search" and subject searching through both "quick" and "advanced" searches. Our Web of Science subscription includes citations and references for articles in almost 9000 high quality, peer-reviewed journals published from 2002 to the present. Web of Science provides complete bibliographic data, searchable author abstracts, and cited references. Coverage is in the sciences (more than 6000 journals), followed by social sciences (approximately 1800 journals), and arts and humanities (approximately 1100 journals). For impact factor information about specific journals, users are directed to the index "Journal Citation Reports."

"The NIH Office of Biotechnology Activities (OBA) promotes science, safety, and ethics in biotechnology through advancement of knowledge, enhancement of public understanding, and development of sound public policies. OBA accomplishes its mission through analysis, deliberation, and communication of scientific, medical, ethical, legal, and social issues." From http://oba.od.nih.gov/oba/index.html

Free access to 700+ texts in life science and healthcare. Users can browse, retrieve, and read content. Provided by
the U.S. National Library of Medicine and National Institutes of Health.

In addition to the National Academy of Sciences, this site includes information about the National Academy of Engineering, the Institute of Medicine, and the National Research Council. Overall, the site has scientific information on topics including the physical sciences, life and earth sciences, medicine and health, education and science and technology policy.

The Protein Databank (PDB) is an archive of experimentally determined 3-dimensional structures of biological macromolecules, serving a global community of researchers, educators, and students.