Biochemistry: Search engine allows you to find articles from 1996-present, but you cannot view anything but the publication information.

Biochemistry Databases from the Hamilton College library. Biological Abstracts, General Science Abstracts, and Pub Med are your best bets for finding what you want. If you want to find what articles have cited a previously published article, go to the Web of Science Citation.

Journal of Biological Chemistry: Has all articles from 1995 to the present online, for free, with a very good search engine.

Nature: The European equivalent of Science, this journal covers a broad range of topics, and has spun off several more specific sister journals, such as Nature Genetics and Nature Biotechnology. On the site, you can search for articles from 1998-on, and can view their abstracts if you register (free) with the site.

Science: The premier journal in the United States, only the most important & pertinent research gets published here. On the site, you can search for articles from 1995-on, and can view their abstracts if you register with the site (registering is free), but full text not available w/o $$$