9Papagianni M. Xanthan production by Xanthomons campestris in batch cultures[J]. Process Biochemistray, 2001, 37 : 73 - 80.
10Zhang Qinghua, Yong Yumei, Mao Zaisha, et al, Exper- imental determination and numerical simulation of mixing time in a gas-liquid stirred tank [ J ]. Chen Eng Sci, 2009,64 (12) : 2926 - 2933.