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.是什么意思_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.在线翻译_英语_读音_用法_例句