PubMed
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PubMed is a free search engine offered by the United States National Library of Medicine as part of the Entrez information retrieval system. It provides a means of searching the MEDLINE database. In addition to MEDLINE, PubMed also offers access to:
- OLDMEDLINE for pre-1966 citations.
- Citations to articles that are out-of-scope (e.g., covering plate tectonics or astrophysics) from certain MEDLINE journals, primarily general science and general chemistry journals, for which the life sciences articles are indexed for MEDLINE.
- In-process citations which provide a record for an article before it is indexed with MeSH and added to MEDLINE or converted to out-of-scope status.
- Citations that precede the date that a journal was selected for MEDLINE indexing (when supplied electronically by the publisher).
- Some life science journals that submit full text to PubMed Central and may not have been recommended for inclusion in MEDLINE although they have undergone a review by NLM, and some physics journals that were part of a prototype PubMed in the early to mid-1990's.[1]
Many PubMed citations contain links to full text articles which are freely available, often on the PubMed Central digital library.
PubMed is one of a number of search engines through which it is possible to search the MEDLINE database; the National Library of Medicine leases the MEDLINE information to a number of private vendors such as Ovid and SilverPlatter. PubMed has been available free on the Internet since the mid-1990s.
Because MEDLINE is the core component of PubMed, an understanding of MEDLINE is essential for effective searching in PubMed.
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