The effect of polyethyleinimine(PEI) on the gel strength of immobilized growth cells was measured by Lloyd 1 instrument 1000S. The effects of PEI on its enzyme activity and on the optimum pH were also studied.

• 利用材料试验仪研究了聚乙烯亚胺 (PEI)对固定化增殖细胞强度的影响 ；并研究了PEI对固定化增殖细胞酶活及最适 pH值的影响 .