Abstract
An automatic system was developed to monitor continuously the colonic temperature of laboratory animals during inhalation exposure to toxic chemicals. It includes: an automatic switchbox, a control circuit, a recorder and a digital voltmeter. The system was calibrated for different temperature ranges and used for a year to assess the effects of household solvents on temperature of Sprague-Dawley rats. Reliable monitoring of temperature in 16 rats was carried out in a sequential manner in the manual mode or in the automatic mode for several consecutive days. Very slight changes (.01 - .02 degrees C) in temperature can be measured with this system.
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