Monitoring and quantification of different aerobic microbial processes in bioreactor, microbial bioconversions and anaerobic biodegradation processes of chlorinated organic xenobiotics in contaminated marine sediments, enzymatic biodegradation of pollutants/plastics making use of chemical, biochemical, microbiological and molecular biology based approaches by the employment of pure and mixed cultures. Study of the dynamics and composition of microbial communities in complex systems.