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Anal Biochem. 1984 May 15;139(1):134-9.

A twin titration microcalorimeter for the study of biochemical reactions.


A small-volume (200 microliter) titration calorimeter of high sensitivity (1 mu cal ) has been developed for the purpose of studying biochemical reactions where the amounts of material are limited to a few nanomoles. High sensitivity is achieved by calorimetric twining , use of glass cells, elimination of vapor space, effective low-energy stirring, and reduction of measurement time. The calorimeter operates using the heat conduction principal with computer-controlled electrical compensation, which reduces the measurement time of each point from 10 to 3 min. This reduction in time is accompanied by a corresponding increase in the precision of measurement. The use of the calorimeter is demonstrated by a measurement of the heat of oxygenation of hemocyanin.

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