Characteristics and Features of PubMed - PubMed is a free search engine accessing the MEDLINE database. - Maintained by the United States National Library of Medicine (NLM). - PubMed was released in January 1996. - PubMed offers access to over 35 million citations and abstracts. - PubMed has links to full-text versions of articles. - PubMed's interface was updated in October 2009. - The website design and domain were updated in January 2020. - Researchers had a critical reaction to the site changes. - The results on PubMed can be sorted by various criteria. - A mobile-friendly version of PubMed is available.

Search and Retrieval Options in PubMed - Simple searches on PubMed can be done by entering key aspects of a subject. - PubMed automatically adds relevant terms, synonyms, and Boolean operators to enhance the search. - PubMed offers comprehensive search options using MeSH terms. - Reference librarians and search specialists can assist with complex searches. - The use of MeSH terms provides more accurate and relevant results. - PubMed supports Boolean operators (AND, OR, NOT) for combining search terms. - MeSH (Medical Subject Headings) can be used to improve search precision. - Truncation and wildcard symbols can be used to expand search terms. - Filters and limits can be applied to narrow down search results. - PubMed offers tools for advanced searching and topic searching.

Journal Article Parameters in PubMed - PubMed extracts and stores structured information about journal articles. - Parameters include article type, secondary identifiers, language, and publication history. - Publication type parameter allows searching by the type of publication. - Secondary identifiers include accession numbers and trial IDs. - PubMed extracts trial IDs from ClinicalTrials.gov and other trial registries.

Related Features and Resources in PubMed - PubMed has a 'related articles' feature to identify relevant articles. - Related articles are listed based on their relatedness to the selected article. - The related articles function can be used instead of a full search. - PubMed automatically links to MeSH terms and subheadings. - MeSH terms help in mapping and organizing the articles in PubMed. - My NCBI provides tools for saving searches, filtering search results, setting up automatic updates sent by e-mail, saving sets of references retrieved as part of a PubMed search, and configuring display formats or highlighting search terms. - LinkOut is an NLM facility to link and make available full-text local journal holdings. - Over 3,200 sites, mainly academic institutions, participate in LinkOut. - Users at participating institutions see their institution's logo within the PubMed search result if the journal is held at that institution. - PubMed Commons allows authors of articles indexed by PubMed to comment on articles. - Initially tested in pilot mode since 2013 and made permanent in 2016. - Discontinued in February 2018 due to minimal usage.

Other Tools and Resources Related to PubMed - MEDLINE is a subset of PubMed that focuses on articles in the field of medicine. - askMEDLINE is a free-text, natural language query tool for MEDLINE/PubMed. - Developed by the NLM and suitable for handhelds. - PubMed Central (PMC) is a digital archive of full-text articles. - MedEvi is a tool for retrieving evidence of relations between biomedical concepts from Medline. - PubCrawler is a tool for keeping up with new articles in PubMed and GenBank. - PMID (PubMed identifier or PubMed unique identifier) is a unique integer value assigned to each PubMed record. - PMID is not the same as PMCID (PubMed Central identifier), which is the identifier for works published in PubMed Central. - The assignment of a PMID or PMCID does not indicate the type or quality of the content. - PMIDs are assigned to various types of publications, including peer-reviewed papers, letters to the editor, and editorial opinions. - Any reference in PubMed can be located using the PMID.