Temperature and the concerntration of iptg are crucial factors for expressing tryptopanase with high activity . a conclusion can be drawn that tryptopanase expressed only by constructed plasmid during " catabolite repression " 在该条件培养得到的菌体能将吲哚、丙酮酸和氯化铵在ph9的条件下转变为色氨酸。
3.
Poly ( lactic acid ) ( pla ) has been widely used as scaffolds for tissue engineering because of its good processability , good biocompatibility and suitable mechanical properties . but its catabolite would often induce erythrophlogosis . the preparation and properties of the pdlla / ha compound fiber and cell culture on the pdlla / ha unwoven meshes had research researched in this paper 聚乳酸( pla )因其良好的生物相容性、生物可降解性以及良好的可塑性而被广泛地应用于组织工程支架材料的研究，但是单一的聚乳酸长期在培养液或机体内因降解而易导致局部炎性反应。
