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Ultrasound (US) serves as a stimulus to change shear viscosity of aqueous polysaccharides of ι-carrageenan, κ-carrageenan and, agar. The US effect was compared in their aqueous solutions at 60°C for the US frequency of 23, 45, and 83kHz. Under the US condition with 50W at 45kHz, the shear viscosity of each aqueous solution was decreased significantly. Subsequently, when the US was stopped, the shear...
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