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【版本】 1997.6 发布

【覆盖年限】 1950s -


     PubMed is a project developed by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM), located at the National Institutes of Health (NIH)

     The PubMed search system provides access to the PubMed database of bibliographic information, which is drawn primarily from MEDLINE and PREMEDLINE. In addition, for participating journals that are indexed selectively for MEDLINE, PubMed includes all articles from that journal, not just those that are included in MEDLINE. Finally, PubMed also provides access to the molecular biology databases included in NCBI's Entrez retrieval system. It is expected that access to additional National Library of Medicine databases will be added in the future.

MEDLINE (MEDlars onLINE) is the National Library of Medicine's (NLM) premier bibliographic database covering the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, and the preclinical sciences. The MEDLINE file contains bibliographic citations and author abstracts from approximately 3,900 current biomedical journals published in the United States and 70 foreign countries. The file contains approximately 9 million records dating back to 1966. Coverage is worldwide, but most records are from English-language sources or have English abstracts. Each MEDLINE record is identified with a unique identifying number called a MEDLINE UID (MUID in PubMed). Citations for MEDLINE are created by the National Library of Medicine, International MEDLARS partners, and cooperating professional organizations. MEDLINE records are incorporated into PubMed weekly, and are also assigned a PubMed unique identifier (PMID).

Introduced by the National Library of Medicine in August 1996, the PREMEDLINE database provides basic citation information and abstracts before the full records are prepared and added to MEDLINE. New records are added to PREMEDLINE daily, and each record receives a MEDLINE UI from the beginning. After MeSH terms, publication types, GenBank accession numbers, and other indexing data added, the completed records are added weekly to MEDLINE, and deleted from the interim PREMEDLINE database. PREMEDLINE records are incorporated into PubMed on a daily basis, and assigned a PubMed unique identifer (PMID).
Some of the PubMed bibliographic data is transmitted to PubMed directly by publishers, and assigned a PubMed identifier (PMID). This data is also used by the National Library of Medicine as input for PREMEDLINE. For a short period of time, while being processed for PREMEDLINE, this data may appear only in PubMed. When a publisher-supplied citation is subsequently incorporated into PREMEDLINE, it is updated to include the UI in addition to the PMID. Later, when the record receives its MeSH terms and other MEDLINE database elements, it will be updated again. Publishers may also, at any time, submit corrections and updates of their citations to PubMed.

Some of the articles received electronically from publishers, however, will never be replaced by PREMEDLINE or MEDLINE articles. This occurs when a particular article in a selectively indexed journal is out of scope for MEDLINE (such as a geology article in a general scientific journal like Science or Nature), but the publisher provides PubMed with electronic information for the entire journal. These records have only a PMID, and no UI.

     PubMed Help is online at


  Internet Grateful Med
  PubMed Central: 通过Internet免费提供生命科学研究报告库 (2000-01-07)
  生物技术与生命科学资源: LabVelocity
  美国国家生物技术信息中心NCBI, NLM, NIH
  药物使用指南, USP DI
  美国国家医学图书馆将停止出版Cumulated Index Medicus (2001-08-08)
  TOXLINE (药物/化合物的生化、生理、毒性文献库)
  Toxline中各数据库的覆盖年代(Toxline Component Databases - Date Coverage)

Summary by 黄苏华 on 1999-12-27

Last updated by 李晓霞 on 2004-10-14

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