PubMed is the free database for searching biomedical literature. It was created and maintained by the National Library of Medicine and contains both primary and secondary literature. It is free to access at http://www.ncbi.nlm.nih.gov/pubmed/ anytime, anywhere.
To have access to full text, make sure you are accessing PubMed via the University of Chicago's proxy account. It is recommended to access PubMed from the science quick links on the library homepage. When you select an individual article from PubMed, you should now see a Find It button in the top right hand corner under full text links. Clicking on this button will direct you to the full text of the article if the University of Chicago has a license with the publisher OR it will direct you to the interlibrary loan service to request the full text article.