Fred Griffith - Research Article from Science and Its Times

This encyclopedia article consists of approximately 1 page of information about Fred Griffith.
This section contains 91 words
(approx. 1 page at 300 words per page)

1877-1941

English bacteriologist whose studies of pneumococci, the bacteria that cause pneumonia, suggested that bacteria could undergo some kind of genetic transformation. The virulence of pneumococci depends on the presence of a polysaccharide capsule. Virulent strains with a polysaccharide coat were known as type S; bacteria without the capsule were type R. When mice were inoculated with a mixture of living R and heat-killed S bacteria, they became infected. Griffith was able to isolate living S bacteria from these animals. Later researchers proved that the transforming factor was DNA.

This section contains 91 words
(approx. 1 page at 300 words per page)
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Science and Its Times
Fred Griffith from Science and Its Times. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.
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