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PMID is the contribution number of life science and medicine collected by PubMed search engine, which is similar to ISBN and DOI, and is used to number the life science and medical literature collected by PubMed search engine.
Doi is an international digital object identification number foundation, a non-profit organization established in 1998.
By the end of 20 10, PMID has marked more than190,000 documents and books related to life science and medicine. Starting from the number of PMID: 1, the word treaty100000 is added every year.
The use of PMID is similar to the International Standard Book Number (ISBN) and DOI, and it can be directly used in PubMed search engine. Each PMID number corresponds to a unique document, and readers can check the title, author, abstract and other information of the document for free.
PubMed is a free search engine that provides a database of biomedical papers and abstracts. Its database source is MEDLINE. Its core theme is medicine, but it also includes other fields related to medicine, such as nursing or other health disciplines.
It also provides quite comprehensive related biomedical information resources such as biochemistry and cell biology. This search engine is provided by the National Library of Medicine and is a part of Entrez information retrieval system. PubMed information does not include the full text of journal articles, but may provide links to full-text providers.
PubMed is the most widely used free MEDLINE on the Internet. This is a network-based biomedical information retrieval system, which was developed by the National Biotechnology Information Center (NCBI) under the National Library of Medicine (NLM) in April 2000. It is one of the whole database query systems of NCBIEntrez.