Experiment with your search terms, i.e., try searching synonyms or alternative ways to express a concept. You also might include the terms "in vitro" and/or "animal model" with terms specific to your research. Also, rather than entering your all of your search terms in one search box as a statement or question, parse out the pieces of your research question into two or more search boxes and connect with an appropriate Boolean operator: AND, OR, NOT (sometimes AND NOT used instead of just NOT) as appropriate.
1) in vitro AND animal model and (heart OR cardiac OR cardiovascular)
2) animal model AND eating disorder*AND NOT rats (if you're seeking studies on other animals, but not rats)
3) animal model AND stress AND long term memory
4) animal alternatives testing AND rats AND "transient global ischemia"
Once you find relevant citations to articles, look at the search terms/subject headings assigned to those articles and try subsequent searches with various combinations of relevant search terms.
Use the HELP feature in any database if you're wondering if you're searching it effectively!
Open access version of MEDLINE and OLDMEDLINE. When searching PubMed off campus, you may need to search the library's JOURNALS BY TITLE database to see if the library subscribes to the articles you need.
NTIS a free bibliographic database compiled by the National Technical Information Service (NTIS). It is a distinguished resource for accessing the latest research sponsored by the United States and some international governments.
TOXNET (TOXicology Data NETwork) is a group of databases covering chemicals and drugs, diseases and the environment, environmental health, occupational safety and health, poisoning, risk assessment and regulations, and toxicology. It is managed by the Toxicology and Environmental Health Information Program (TEHIP) in the Division of Specialized Information Services (SIS) of the National Library of Medicine (NLM).