Hungate, Robert E. Department of Bacteriology, University of California, Davis, California.
Halvorson, Harlyn O. Department of Biochemistry, University of Minnesota, Minneapolis, Minnesota.
Hutchison, Keith Department of Biology, Brandeis University, Waltham, Massachusetts.
Orrego, Cristian Department of Biology, Brandeis University, Waltham, Massachusetts.
Show previous versions
- Chemical relationships
- Links to Primary Literature
- Additional Readings
Extremely small, relatively simple microorganisms possessing the prokaryotic type of cell construction. Bacteria are very small prokaryotic microorganisms, usually measuring 0.3 to 2.0 micrometers in diameter (Fig. 1). They are found almost everywhere, being abundant in soil, water, and the alimentary tracts of animals. Each kind of bacterium is fitted physiologically to survive in one of the innumerable habitats created by various combinations of space, food, moisture, light, air, temperature, inhibitory substances, and accompanying organisms. Dried bacteria, but often still living, can be carried into the air. One of the few locations in which bacteria are not usually found is within the cells of other healthy organisms, although even this is subject to exceptions; for example, there are many bacteria that do live intracellularly in a number of eukaryotic organisms. See also: Bacterial growth; Bacterial physiology and metabolism; Bacteriology; Microbiology; Prokaryotae
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information