[Pl. bacterium], microscopic unicellular prokaryotic membrane characterized by the absence of a nucleus and membrane organelles. It used to be part of the plant kingdom, bacteria were eventually placed in a separate kingdom. Bacteria fall into one of two groups
(long form believe evolved separately from other bacteria) and eubacteria. Recently proposed strattera price system classifies archaea, or archaea, and eubacteria as major groups (sometimes called domains) above the kingdom. Bacteria were the only form of life on Earth 2 billion years. They were first discovered by Anthony van
of 17 percent. , Bacteriology as an applied science began to develop in the late 19th century. As a result of research in medicine and in fermentation processes, especially Louis
and Robert. Bacteria adapt perfectly to different environmental conditions: they are in the body of all living organisms and in all areas of land and ocean areas earthin depths, in arctic ice and glaciers, in hot springs, and even in the stratosphere. Our understanding of bacteria and their metabolic processes, expanding by opening species that can live only deep below the earth's surface, and the species that thrive without sunlight in high temperatures and pressures around >> << at the bottom of the ocean. There are more bacteria, as individuals, than any other type of organism, can not be greater than 2. 5000000000 bacteria in one gram of fertile soil. Encyclopedia Columbia Electronic,
6th ed. Copyright 2007, Columbia University Press. All rights reserved. .
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