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Biopolymer DYU500 produced from Bacillus subtilis DYU1 was found to have excellent flocculating ability. With the addition of 40mg-DYU500/L and 50mM CaCO 3 , the optimum temperature for flocculation performance of DYU500 was 30°C, giving the highest flocculating activity and rate of 13.5 and 97%, respectively. Analysis with Fourier transform infrared spectrophotometry (FT-IR), nuclear magnetic...
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