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Simple searches on PubMed can be carried out by entering key aspects of a subject into PubMed's search window. PubMed translates this initial search formulation and automatically adds field names, relevant MeSH (Medical Subject Headings) terms, synonyms, Boolean operators, and 'nests' the resulting terms appropriately, enhancing the search ...
All databases indexed by Entrez can be searched via a single query string, supporting Boolean operators and search term tags to limit parts of the search statement to particular fields. This returns a unified results page, that shows the number of hits for the search in each of the databases, which are also linked to actual search results for ...
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. . Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is availa
PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall).
This option may help to identify possible Medical Subject Headings (known as MeSH terms, but called ‘Topics’ by Anne O’Tate) for a subject for which no corresponding subject heading or ‘entry term’ (cross-references to preferred MeSH term) exists or where PubMed’s automatic mapping process (identifying a MeSH term and including it in a search formulation) fails.
The National Library of Medicine runs the National Center for Biotechnology Information, which houses biological databases (PubMed among them) that are freely accessible on the Internet through the Entrez search engine [8] and Lister Hill National Center For Biomedical Communications. [9]
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.
MethBase: database of DNA methylation data visualized on the UCSC Genome Browser; Minimotif Miner: database of short contiguous functional peptide motifs; Oncogenomic databases: a compilation of databases that serve for cancer research; PubMed: references and abstracts on life sciences and biomedical topics; RIKEN integrated database of mammals