Database Link ：https://www.ncbi.nlm.nih.gov/pubmed/
Pubmed database is a free search engine for biomedical papers and abstracts. Its database source is MEDLINE. Its core theme is medicine, but it also includes other areas related to medicine, such as nursing or other health sciences. It also provides fairly comprehensive support for relevant biomedical information, such as biochemistry and cell biology. This search engine is provided by the U.S. National Library of Medicine as part of the Entrez information retrieval system. Pubmed database information does not include the full text of journal articles, but may provide links to full-text providers (paid or free).
Pubmed database is an Internet retrieval system developed by the National Library of Medicine (NLM) under the National Institutes of Health (NIH) of the United States, based on the National Center for Biomedical Information (NCBI) platform. PubMed is one of NCBI Entrez's several database query systems. PubMed provides free access to MEDLINE, prePubMed and other related databases, including DNA and protein sequences, gene mapping data, 3D protein conformation, and human Mendelian genetics online. It covers nearly 4 600 biomedical journals from more than 70 countries in more than 40 languages since 1953.
Main features of Pubmed Database:
1. Abundant information resources.
(1) Pubmed database covers the required contents of MEDLINE database. All MEDLINE database data in Pubmed database is identified as [Pubmed - Indexed for MEDLINE].
(2) In order to speed up the reporting speed, Pubmed database system provides retrieval of the latest records that have not been indexed in the form of prePubMed database, and uses [PubMed-in-process] for each entry.
(3) The literature directly provided by publishers can be divided into two categories. One is that the journals themselves are included in MEDLINE journals, but some of the literatures are not covered by MEDLINE; Another category is MEDLINE, which does not start from the first year of a journal. Both are identified as [PubMed-as supplied by publishers.
(4) OldMEDLINE database. It currently contains more than 1.5 million bibliographies from 1951 to 1965. OldMEDLINE does not contain a summary and maintains the indexing of the old MeSH word list.
2. Pubmed database has high information quality and fast update speed.
3. Pubmed database subject processing specification and application of data mining technology.
4. Pubmed database has powerful linking function.
5. The retrieval methods of Pubmed database are flexible and diverse.