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PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval .
The PMCID (PubMed Central identifier), also known as the PMC reference number, is a bibliographic identifier for the PubMed Central open access database, much like the PMID is the bibliographic identifier for the PubMed database. The two identifiers are distinct however. It consists of "PMC" followed by a string of numbers. The format is: [35]
The Entrez Global Query Cross-Database Search System is used at NCBI for all the major databases such as Nucleotide and Protein Sequences, Protein Structures, PubMed, Taxonomy, Complete Genomes, OMIM, and several others. [9] Entrez is both an indexing and retrieval system having data from various sources for biomedical research.
EconBiz supports research in and teaching of economics with a central entry point for all kinds of subject-specific information and direct access to full texts. Free Produced by the ZBW- German National Library of Economics– Leibniz Information Centre for Economics (ZBW) [51] EconLit: Economics
When we search for a MeSH term, the most specific MeSH terms are automatically included in the search. This is known as the extended search or explode of that MeSH term. This additional information and the hierarchical structure (see below) make the MeSH essentially a thesaurus, rather than a plain subject headings list. [4]
PubMed Central is the designated repository for papers submitted in accordance with the NIH Public Access Policy and for those that fall under similar policies from other funding agencies. [ 12 ] By April 2014, the NIH had increased enforcement of compliance with its Public Access Policy by delaying continuing grant payments for noncompliance.
PubChem is a database of chemical molecules and their activities against biological assays.The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine, which is part of the United States National Institutes of Health (NIH).
This database lasted until 1972 when it merged with Elsevier. In 1972, EM had joined with Elsevier and later, in 1975, formed EMBASE (Excerpta Medica database) which had released electronic access to abstract journals. Following feedback from the EMBASE user community, EMBASE Classic was created as a separate database to supplement EMBASE as a ...