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PubMed is a free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval. From 1971 to 1997, MEDLINE online access to the MEDLARS Online computerized database had been primarily through institutional facilities, such as university libraries. PubMed, first released in January 1996, ushered in the era of private, free, home- and office-based MEDLINE searching. The PubMed system was offered free to the public in June 1997, when MEDLINE searches via the Web were demonstrated, in a ceremony, by Vice President Al Gore. ==Content== PubMed provides quality control in scientific publishing. Only journals that meet PubMed's scientific standards are indexed.〔For example, the journal Fluoride is not indexed by PubMed because it does not meet standards of scientific objectivity.〕 In addition to MEDLINE, PubMed provides access to: * older references from the print version of ''Index Medicus'' back to 1951 and earlier; * references to some journals before they were indexed in Index Medicus and MEDLINE, for instance ''Science'', ''BMJ'', and ''Annals of Surgery''; * very recent entries to records for an article before it is indexed with Medical Subject Headings (MeSH) and added to MEDLINE; and * a collection of books available full-text and other subsets of NLM records. * PMC citations Many PubMed records contain links to full text articles, some of which are freely available, often in PubMed Central and local mirrors such as UK PubMed Central. Information about the journals indexed in PubMed is found in the NLM Catalog.〔(【引用サイトリンク】url=http://www.ncbi.nlm.nih.gov/nlmcatalog/journals )〕 , PubMed has over 24.6 million records going back to 1966, selectively to the year 1865, and very selectively to 1809; about 500,000 new records are added each year. , 13.1 million of PubMed's records are listed with their abstracts, and 14.2 million articles have links to full-text (of which 3.8 million articles are available full-text for free for any user). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PubMed」の詳細全文を読む スポンサード リンク
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