This paper reports on the state of the art silicon micromachined microphone utilizing a dual poly silicon membrane system. MEMS chips from 1.4mm down to 1.0mm side length are applied for mobile communication. Design aspects related with key performance parameters such as sensitivity, signal to noise ration and distortion are discussed. Sensitivity of -38BV/Pa is achieved for different microphon...

fed a diet consisting of natural foodstuffs than when main tained on a semipurified ration. Whereas these comparative differences between stock rations and purified diets relative to tumor incidence have been evaluated in terms of carcinogenic compounds and spontaneously appearing tumors, to our knowledge this effect has never been assessed in regards to exposure to sublethal doses of total-bod...