Tools for literature search
The universe of academic information is constantly expanding, and services to make that information accessible are also expanding. An internet services company (Allconnect, USA) gives good basic advice on how to find reliable information sources: The Student's Internet Research Guide
Google Scholar - this has a wealth of related tools for literature research.
worldwidescience.org - this portal is special as it can be used with many different languages.
Major publishers or publishing networks
Bioline International - A "not-for-profit scholarly publishing cooperative committed to providing open access to quality research (bioscience) journals published in developing countries" (Open Access).
BioOne Complete - A "full-text database of more than 200 leading journals in the biological, ecological, and environmental sciences"
ScienceDirect - Search portal for peer-reviewed journals, articles, book chapters and open access content published by Elsevier. Find articles from over 3,800 journals and more than 37,000 book titles.
Taylor & Francis Online - A commercial publisher in all major subject areas. When viewing a journal page, open access content is indicated by an orange unlock icon.