This tutorial created by the Health Science and Human Services Library at the University of Maryland, Baltimore will show you how to set up a My NCBI account and receive e-mail notifications of new resources from a saved search.
Use NOT to narrow your search.
When using NOT in a keyword search, it will exclude records that have a related term you don't want to include or a term that could be implied by your other search terms. For example the following search on weight loss will exclude any articles about anorexia.
Use AND to narrow your search.
When using AND, it will find records that have both terms in them. For example the following will search for articles that have both diabetes and hypertension somewhere in the text when doing a keyword search.
Use OR to expand your search.
When using OR in a keyword search, it will find records that have either or both terms in them. For example the following will search for articles that have either high blood pressure or hypertension or both.
