NAR Molecular Biology Database Collection entry number 298

Database Description

The PubMed database is available on the Entrez retrieval system, and was developed by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM). PubMed provides free access to MEDLINE, NLM's database of more than 13 million bibliographic citations and abstracts in the fields of biomedicine, nursing, dentistry, veterinary medicine, health care systems, and preclinical sciences. PubMed also includes access to additional selected life sciences journals not in MEDLINE. PubMed's LinkOut feature provides access to a wide variety of relevant web-accessible online resources, including full-text publications, biological databases, consumer health information, and research tools. Links are also available to the molecular biology databases maintained by NCBI. New citations are typically added to PubMed Tuesday through Saturday.

Recent Developments

Two new NCBI databases, Journals and MeSH, were created to provide additional search features for PubMed. The Related Articles algorithm was modified to better calculate citations that are closely related to a selected article. Icons were added to the PubMed Summary page display to indicate whether or not a link to the free full-text article is available. An e-mail feature, cancer subset, and several new indexes were added including: Corporate Author, Comments/Corrections, Place of Publication, Grant Number, and Ahead of Print. In addition, the LinkOut library program now includes print as well as electronic holdings data.

NCBI continued development of PubMed, with enhancements including the addition of over 1.7 million OLDMEDLINE citations. These citations were originally printed in the hardcopy indexes published from 1950 through 1965. The MeSH database was enhanced with terms that are identified by MeSH as pharmacological actions and a direct link was added to the Clinical Queries page. The Clinical Queries page was also revised and the filter strategies were updated. The History page now includes a menu from the search statements number to provide an easier way to combine, delete and retrieve History statements. The truncation limit in PubMed was increased from 150 variations of a truncated term to 600. Entrez programming software used by PubMed was enhanced to improve the way in which PubMed interprets users' queries. A new Entrez NCBI database, NLM Catalog, was developed to provide additional search features for books, journals and audiovisuals in the NLM collections.

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