Figure 1.

The growth properties of CP4, HYM and HYMX on simple chemical medium supplemented with yeast extract or without yeast extract. All strains were obtained by centrifugal sedimentation method. The same weight wet cells were washed by ultrapure water for three times before being inoculated, then all petri dishes were kept at 32°C or 42°C for 60 hours. CP4 grows well in medium (Table 1) contain yeast extract and glucose (plate G, plate G + X); can’t grow in simple chemical medium without yeast extract (plate I, plate II and plate III) and in medium contain yeast extract with xylose as the only carbon source (plate X). HYM and HYMX can grow in simple chemical medium without yeast extract (plate I, plate II and plate III). HYMX can grow also in medium when xylose as the only carbon source (plate X).