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Use truncation (*) to find word variants. Adolescen* retrieves adolescent, adolescents, adolescence.
Use quotation marks (" ") around phrases to search for exact phrases.
Example: "Mechanical Ventilation"
MeSH, an abbreviation of Medical Subject Headings, is the National Library of Medicine's thesaurus of medical terms used to index articles from biomedical journals for the MEDLINE®/PubMED® database. In MEDLINE/PubMed, every article is indexed with 10-15 headings and subheadings.
The medical terms, called MeSH descriptors, are arranged in an alphabetic and a hierarchical structure. The hierarchical structure is referred to as the MeSH Tree and is organized into 16 main categories, or branches.
The first branch of the MeSH tree is Anatomy with subheadings Body regions, Musculoskeletal system, Digestive system, Respiratory system, etc. PubMed automatically searches the MeSH headings and more specific terms beneath that heading in the MeSH hierarchy. This is known as the explosion feature.
Some terms occur in more than one place in the hierarchy. For example, "Eye" appears under the Anatomy branch, but also under the Sense Organs branch.
Here is a portion of the MeSH Tree structure for abdominal pain:
Pathological Conditions, Signs and Symptoms [C23]
Signs and Symptoms [C23.888]
Abdominal Pain [C23.888.646.100]
Abdomen, Acute [C23.888.646.100.200]
Renal Colic [C23.888.646.100.800]
What does this mean?
A search of PubMed using the term "abdominal pain" will produce more relevant results than using the term "stomach ache."
Using the thesaurus or index terms, also called a controlled vocabulary and takes the guess work out of searching. Since we have many different ways of describing concepts, drawing these terms together under a single word or phrase in a database makes searching the database more efficient.
Conducting a search in a database that uses controlled vocabulary or indexing terms is efficient and precise.Once you do find the correct term, most of the information you need is grouped together in one place, saving you the time of having to search under all of the other synonyms for that term.
Open Access Journal are journals that use a funding model that does not charge readers or their institutions for access. The journals must exercise peer-review or editorial quality control to be included in the Directory of Open Access Journals (DOAJ). For more information, visit their website at: DOAJ -- Directory of Open Access Journals