In addn. to online detection of events in biotechnol., calorimetry could be used to control processes. In the latter case, a correct and instantaneous heat signal must be available. This would be possible only if a correct evaluation of baseline evolution were possible. In this paper, it is shown that torque measurements are a powerful tool for detecting and correcting baseline shifts and for eliminating external perturbations during cultures of a filamentous bacterium. [on SciFinder (R)]