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PubMed Central (PMC) is a free digital repository that archives publicly accessible full-text scholarly articles that have been published within the biomedical and life sciences journal literature. As one of the major research databases within the suite of resources that have been developed by the National Center for Biotechnology Information (NCBI), PubMed Central is much more than just a document repository. Submissions into PMC undergo an indexing and formatting procedure which results in enhanced metadata, medical ontology, and unique identifiers which all enrich the XML structured data for each article on deposit.〔(Beck, Jeff. Report from the Field: PubMed Central, an XML-based Archive of Life Sciences Journal Articles. )〕 Content within PMC can easily be interlinked to many other NCBI databases and accessed via Entrez search and retrieval systems, further enhancing the public’s ability to freely discover, read and build upon this portfolio of biomedical knowledge.〔(NCBI Handbook: PubMed Central. Chris Maloney, Ed Sequeira, Christopher Kelly, Rebecca Orris, and Jeffrey Beck Dec 2013 )〕 PubMed Central should not be confused with PubMed. These are two very different services at their core.〔(MEDLINE, PubMed, and PMC (PubMed Central): How are they different? )〕 While PubMed is a searchable database of biomedical citations and abstracts, the full-text article referenced in the PubMed record will physically reside elsewhere. (Sometimes in print, sometimes online, sometimes free, sometimes behind a toll-wall accessible only to paying subscribers). PubMed Central is a free digital archive of articles, accessible to anyone from anywhere via a basic web browser. The full text of all PubMed Central articles is free to read, with varying provisions for reuse. , the PMC archive contained over 2.9 million articles, with contributions coming directly from publishers or authors depositing their own manuscripts into the repository per the NIH Public Access Policy. Recent data shows that in the past year (Jan 2013 – Jan 2014) author initiated deposits exceeded 103,000 papers during just this 12-month period.〔(NIH Manuscript Submission Statistics )〕 PMC also identifies about 4,000 journals which now participate in some capacity to automatically deposit their published content into the PMC repository.〔(PubMedCentral )〕 Some participating publishers will delay the release of their articles on PubMed Central for a set time after publication, this is often referred to as an “embargo period”, and can range from a few months to a few years depending on the journal. (Embargoes of six to twelve months are the most common). ==Adoption== Launched in February 2000, the repository has grown rapidly as the NIH Public Access Policy is designed to make all research funded by the National Institutes of Health (NIH) freely accessible to anyone, and, in addition, many publishers are working cooperatively with the NIH to provide free access to their works. In late 2007, the Consolidated Appropriations Act of 2008 (H.R. 2764) was signed into law and included a provision requiring the NIH to modify its policies and require inclusion into PubMed Central complete electronic copies of their peer-reviewed research and findings from NIH-funded research. These articles are required to be included within 12 months of publication. This is the first time the US government has required an agency to provide open access to research and is an evolution from the 2005 policy, in which the NIH asked researchers to voluntarily add their research to PubMed Central. A UK version of the PubMed Central system, UK PubMed Central (UKPMC), has been developed by the Wellcome Trust and the British Library as part of a nine-strong group of UK research funders. This system went live in January 2007. On 1 November 2012, it became Europe PubMed Central. The Canadian member of the PubMed Central International network, PubMed Central Canada, was launched in October 2009. The National Library of Medicine "NLM Journal Publishing Tag Set" journal article markup language is freely available.〔(【引用サイトリンク】url=http://dtd.nlm.nih.gov/publishing/ )〕 The Association of Learned and Professional Society Publishers comments that "it is likely to become the standard for preparing scholarly content for both books and journals". A related DTD is available for books.〔(NLM-NCBI Book Tag Set )〕 The Library of Congress and the British Library have announced support for the NLM DTD. It has also been popular with journal service providers.〔(Inera NLM DTD Resources )〕 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 Central」の詳細全文を読む スポンサード リンク
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