3.2. Growth characterization
The strain Caulobacter sp. FMC1 was isolated under anaerobic environment, and was also found to be able to grow in aerobic liquid medium. Effects of temperature and pH on the growth of the strain Caulobacter sp. FMC1 under both aerobic and anaerobic conditions were shown in Fig. 2. With using cellobiose as substrate, the optimum condition was about 37.5–40 °C at pH of 6.5–8.0 for aerobic growth, and from 30 to 45 °C at pH of 7.0–8.0 for anaerobic growth. Therefore, temperature and initial pH value of medium for both aerobic and anaerobic growths were set as 37.5 °C and 7.0, respectively.