Berg, Howard2014-06-041971Berg, Howard C. 1971. “How to Track Bacteria.” Review of Scientific Instruments 42 (6): 868.0034-67481089-7623http://nrs.harvard.edu/urn-3:HUL.InstRepos:12242820A microscope is described which automatically remains focused on individual motile bacteria. The container in which the bacteria are suspended is moved in such a way that the position of a given organism remains fixed; x, y, and z drive signals provide a measure of its displacement relative to the suspension medium. Records are shown of the motion of Escherischia coli.en-USJournal Article2014-06-0410.1063/1.1685246