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| | Introduction to the Bacteria (Site not responding. Last check: 2007-11-01) |
 | | Bacteria are often maligned as the causes of human and animal disease (like this one, Leptospira, which causes serious disease in livestock). |
 | | However, certain bacteria, the actinomycetes, produce antibiotics such as streptomycin and nocardicin; others live symbiotically in the guts of animals (including humans) or elsewhere in their bodies, or on the roots of certain plants, converting nitrogen into a usable form. |
 | | Bacteria are of such immense importance because of their extreme flexibility, capacity for rapid growth and reproduction, and great age - the oldest fossils known, nearly 3.5 billion years old, are fossils of bacteria-like organisms. |
| www.ucmp.berkeley.edu /bacteria/bacteria.html (205 words) |
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