While not specific to the sciences, these databases can be good starting points for research papers. They represent a wide variety of material and can assist with everything from giving a general introduction to a topic to providing scholarly, peer-reviewed articles. They can also be good sources for non major courses.
JSTOR is a digital library of academic journals, books, images, and primary sources.
Articles from scholarly journals, popular magazines and newspapers, in many different subject areas.
These databases are specific to physics or at least to the sciences in general. Here you will find popular articles as well as scholarly, peer-reviewed publications on a wide range of topics in physics and other scientific disciplines.
PKP is a multi-university initiative developing (free) open source software and conducting research to improve the quality and reach of scholarly publishing.
Abstracts and full text of chemistry literature and information on specific chemical structures and reactions.
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