Microbiology is the study of many different kinds of organisms from several groups. These may be protists, plants, animals, fungus or other things. The common theme here though, is being small. Microscopes are most often used to see the individual organisms.

BiologyBase Links:

Kingdom Bacteria in the Classification of Life

Microbes.info a microbiology link portal with forum

Mono Lake Microbial Observatory studies the microfauna and microflora of this extreme environment

Binocular Microscope: It's Features and Care - a major tool in the hunt for microbes

Center for Microbial Ecology, Michigan State University

AlgaeBase, information on algae of the world (no connection to BiologyBase)

Molecular Evolution of Prions, by Henry Gee

Viroids and Virusoids from MicrobiologyBytes

MicrobiologyBytes a blog and more about microbiology

International Society for Microbial Ecology

International Union of Microbiological Societies

International Society of Protistologists

Sociedead Brasileira de Microbiologia (Brazilian Society of Microbiology, in Portugese)

Australian Society for Microbiology

Federation of African Societies of Virologists

Virtual Museum of Bacteria

The Plankton Net