Text databases and search engines

• PubMed: The biomedical literature database offered by the NCBI.
  
• PMC: PubMed Central (PMC) is the U.S. National Institutes of Health (NIH) free digital archive of full text biomedical and life sciences journal literature.
  
• PubChem: The chemistry literature/compound database offered by the NCBI.
  
• HighWire: Free Online Full-text Articles.
  
• Infotrieve: Information retrieval resource.
• NPG search engine: Search engine provided by the Nature Publishing Group (NPG) with semantic text matching.
• CrossRef search: Full content search engine for 29 publishers.
• Scopus: Scientific literature abstract database and search engine (Elsevier).
• CAS: Chemical Abstracts Service.
• Google Scholar: search engine for scholarly literature including papers, theses, books, abstracts and articles.

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