方法：将基因内翻译起始序列合成后克隆到上游含有起始密码和无起始密码的报告质粒中，研究表达水平的差异。
Methods:One of the three internal translation initiation region(TIR) was chemically synthesized and cloned into the report plasmid, and the expression of the report gene was studied.
发酵过程中维持低葡萄糖水平可以限制细胞的生长速率，提高质粒稳定性和促进青霉素G酰化酶的合成。
Methods:The influence of ammonium sulfate and glucose on plasmid stability and penicillin G acylase activity were conducted in flask shakes and a 5L fermentor.
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