Academic Search Complete is a multi-disciplinary database with access to articles from many different disciplines such as Health and Science.
GreenFILE offers a unique perspective on the positive and negative ways humans affect the environment.
MEDLINE with Full Text contains authoritative information from over 4,000 current biomedical journals.
Academic OneFile provides peer-reviewed, full-text articles from leading journals and reference sources. Includes coverage of the physical sciences, technology, medicine, and other subjects.
JSTOR is a database that houses articles in the sciences and social sciences. When using this database, be sure to choose "Advanced Search" and use the check boxes to mark all biology disciplines fitting your search.
TIP: When searching these databases, try searching your term as well as the words experiment, empirical, or study to ensure that your results are empirical in nature.