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PubMed: MEDLINE和PREMEDLINE(免费)
链接地址: http://www.ncbi.nlm.nih.gov/PubMed/
内容简介:
【数据内容】
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
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).

PREMEDLINE
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 in
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