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Response surface 3D plot of the effect of interaction of factors on protein yield. (a) pulse time and pulsed field intensity interaction, (b) pulse time and ultrasonic time interaction, (c) pulse time and ultrasonic power interaction, (d) ultrasonic time and pulsed field intensity interaction, (e) ultrasonic power and pulsed field intensity interaction, (f) ultrasonic power and ultrasonic time interaction.
