Emtree is the Embase thesaurus of index terms, which facilitates the identification of the most suitable terms for a search and is arranged in a hierarchical tree structure, allowing for searching within groups of related terms.
Exploding searches your term (or maps to the preferred Emtree term) and related narrower terms, e.g., ‘brain disease’/exp also retrieves Alzheimer's disease and other narrower terms.
Mapping means that searchers get the same results regardless of which term they use, e.g., Vioxx (synonym) or rofecoxib (the preferred term).
Medline is the National Library of Medicine journal citation database.
MeSH is the Medline thesaurus of index terms.
PubMed is the public interface used to search Medline and provides additional content, including articles outside the scope of Medline, the NCBI Bookshelf, and “ahead of print” citations.
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