DIELECTRIC SPECTROSCOPIC EVALUATION IN THE EXTREMELY LOW FREQUENCY RANGE OF AN ASPERGILLUS NIGER CULTURE

By using the dielectric spectroscopy technique in the extremely low frequency (1-200Hz) range, dielectric loss tg delta was determined on both Aspergillus niger cultures in different growth stages and autoclaved biomass compared to the Czapex-Dox culture medium with sterile sucrose. Experimental results have shown that living and sterile matter samples have different dielectric characteristics. In sterile probes, the evolutionary functions of tg delta depending on frequency are continuous, specific to alpha-relaxation governed by DC electrical conductivity. In living matter samples, the function of dielectric losses tg delta, depending on frequency, show several discontinuities that indicate the existence of some processes in which, at those frequencies, the number of charge carriers from investigated living matter is changing. It has also been found that the package of active processes differs depending on the growth stage of Aspergillus niger.