PubMed was developed by the National Center for Biotechnology Information at the NationalLibrary of Medicine (NLM) as part of the Entrez retrieval system (Life Sciences SearchEngine and is located at the National Institute of Health (NIH) in Maryland.PubMed is a free resource that is comprised of over 21 million citations for biomedicalliterature. These citation and abstracts cover a wide range of biomedical fields as well asfields relating to life sciences, behavioral sciences, chemical sciences and bioengineering.
This is a screenshot of PubMed’s website. Elizabeth is going to be giving you a detailed tutorial later, but I just wanted to give you guys a sense of what it looks like while I talk about the databases and technology that underlie PubMed.
MeSH- National Library of Medicine’s controlled vocabulary thesaurusMeSH is made up of sets of terms used as naming descriptors within a hierarchical system. This allowsusers to search inquiries on a broad spectrum or to search using more specific queries.There are 26,142 descriptors in 2011 MeSH. There are also over 177,000 entry terms that assist in finding the most appropriate MeSH Heading, for example, "Vitamin C" is an entry term to "Ascorbic Acid." In addition to these headings, there are more than 199,000 headings called Supplementary Concept Records (formerly Supplementary Chemical Records) within a separate thesaurus.
Overall, MeSH is a faceted form of classification, with each facet organized in a tree structure. But MeSh leaves a lot of room open for associative relationships. It does not require fine-granularity from its searchers. This is a picture of how MeSH handles related terms. Terms in a MeSH record which are strictly synonymous with each other are grouped in a category called a "Concept."
Integrated: GENSAT project, a genetic atlas of an adult mouse. OMIM, Online Mendelian Inheritance in Man, a compendium of human genes.Updated: journal publication takes a while, current information more readily accessible.Authority: people actually use it.
Developed by the National Library of Medicine (NLM) Biomedical Life sciences+21 Million Citations & covering Behavioral sciences Abstracts Chemical sciences Bioengineering
Medline• PubMed’s primary component• NLM’s premiere bibliographic database, indexingover 19 million references to journal articles, oversixty years• Journals are selected for indexing by theLiterature Selection Technical Review Committee(LSTRC), an NIH-centered advisory board. • The committee ensures representation by women and minorities, members from different regions across the US
• MeSh : the indexing language used by the National Library of Medicine• A controlled vocabulary developed by NLM, consisting of: 26, 142 descriptor terms 177, 000 entry terms• E.g. Vitamin “C” entry term for “Ascorbic Acid”
Strengths:• Free• Integrated with other search engines developed by the NLM• Updated daily, links to journal articles, and also with informationpresented online in an early version before being published in journals• An established authoritative database in the medical researchcommunity•Provides accurate search results• Accessible from mobile devices
Weaknesses:• Other databases allow users to sort results by “most cited.”PubMed does not allow this• Lack of citation analysis• Inaccessible to the general user
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