he application of ultrasound to biotechnologyis one of the new interesting research fields. Anumber of studies has shown that some bio-chemical processes can be activated by ultra-sound in the presence of enzymes and cells.Generally,lower intensity ultrasound can in-crease the activity of enzymes and immobilisedenzymes or improve the metabolism of cells bythe improvement of mechanism of mass-trans-fer of substrates.The advance and future ofapplications of ultrasound to biotechnology isdiscussed by some exam...