BASE: Bielefeld Academic Search Engine one of the best and most comprehensive tools for locating open-access books, journals, dissertations, and other scholarly sources available worldwide.
Websites
American Society for Microbiology
BioMed Central Publisher of 220 peer-reviewed open access journals
Foodborne Illness Outbreak Database
Microbial Life-Educational Resources
Microbiology @ Nature (Find Nature full text in libraries' database, i.e. Academic Search Complete--one year embargo)
Society for Applied Microbiology
Digital Libraries
MetaLib, a service of the Catalog of U.S. Government Publications (53 government databases, subject gateways, digital repositories and e-journals)
National Science Digital Library
OAIster More than 19 million digital resources from over 1,000 organizations developed by the University of Michigan.
Science Portal (U.S. Government)
Virtual Cell Animation Collection
WorldWideScience.org is a global science gateway comprised of national and international scientific databases and portals.
USGS - Microbiology Image Gallery