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CANNEFAX, GEORGE R. (Communicable Disease Center, Atlanta, Ga.). A temperaturegradient bar and its applications to the study of temperature effects on the growth of Reiter's treponeme. J. Bacteriol. 83:708-710. 1962.-A temperature-gradient device is described which employs a constant heat source and an aluminum bar with 294 holes to accommodate small test tubes. Examples of the range and degree of temperature gradients are presented, and the factors affecting heat conduction and heat losses are discussed. Three temperature gradients obtained

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