Figure 2: The effect of the concentration of NaHCO3 (a) and chitosan (b) on the activity recovery of immobilized cells. The activity of free cells was defined as 100%. a: 1.5% (w/v) glutaraldehyde,10% (w/v) NaHCO3, 5 mg (dry weight) cells; b: 1.5% (w/v) glutaraldehyde,1.5% (w/v) chitosan, 5 mg (dry weight) cells.