Chemistry  

SciFinder is the biggest database in chemistry. You can search for a research topic, a compound, or a reaction.
Before you start you will need to create an account!

Before using SciFinder you will need to create an account. You must use your Duke email address.

Reaxys is another database in chemistry. You can find information about topics, compounds, and reactions. It covers less than SciFinder, but does some things better (like reactions).

This is a powerful multidisciplinary database. The great thing about this database is its citation searching. If you have a specific article in mind you can find out which articles cited it after publication.

This a free database from the National Library of Medicine. It is the main database in medicine but also covers a lot of chemistry. If you use this link you should also have links to articles through Duke's subscriptions.