Monitoring of microwave emission from aqueous solution of horseradish peroxidase(HRP) intheprocess of the enzyme functioning was carried out.For the monitoring, a system containing HRP,luminol and Н2О2 was employed. Microwave emission measurements were carried out in the3.4-4.2 GHz frequency
Range using the active and passive modes(active-mod eand passive-mod emeasurements).In th eactive mode, excitation of the solution in the pulsed electromagnetic field was accomplished .In the passive mode, no excitation was induced .It appears that the passive-mode measurements taken in the course of the peroxidase reaction in the enzyme system have shown a0.5 °С increase of the microwave signal.
Upon the active-mode measurements,taken in the same reaction conditions ,the forced excitation of the solution has also led to the increase(by2 °С) of the level of the microwave signal – i.e. toits 4-fold
enhancement compared to the signal obtained inpassive-mode measurements.