Application of ultrasound to milk in yogurt production before inoculation increases consistency, gel strength, and viscosity, and decreases syneresis in the yogurt. attributed the improvement in physical characteristics to increased water-holding capacity, while .. who used an MTS treatment of milk at 20 kHz, 0.2 MPa and 40 for 12 second, attributed it to increased whey protein denaturation caused by the ultrasound. The latter authors considered the possibility that the improved texture could be due to the homogenization. found differences in the microstructure of yogurt made from thermosonicated (24 kHz, 400 W nominal power output, 45 C, 10 minutes) milk compared with yogurt made from conventionally heated (90 C/10 minutes) milk. It had a more porous, honeycomb-like network and smaller-sized particles (