a process and apparatus wherein multiple instantaneous pressure pulsations with a regulated frequency and amplitude are applied to various biological substances in order to eliminate the undesired microorganisms in these substances with minimal negative effect on the quality of these substances , and , further , to use these in mass production of foodstuffs pharmaceuticals for treatment of human blood or plasma , and for research to establish a specific frequency of pressure pulsations at which a particular type of bacteria could be selectively destroyed while other components of the substance remain intact .