聚氨酯泡沫固定化重组枯草杆菌三段培养生产青霉素酰化酶

来源 :化工学报 | 被引量 : 0次 | 上传用户:xxc1990531
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
引言青霉素G酰化酶(penicillin G acylase, EC 3.5.1.11,PGA)是β-内酰胺类抗生素工业中的关键酶之一.目前主要采用大肠杆菌和巨大芽孢杆菌进行工业化生产,但由于产酶水平较低、变温发酵和需要苯乙酸诱导等缺点,国内外研究者尝试采用各种基因重组技术,以期大幅度提高产酶效率和优化生产工艺[1~5].
其他文献
敏捷运动是一场秀还是对“真理”的重新认识,这已不是焦点。最近InfoQ中文站敏捷社区讨论比较热烈的一个主题是,“如何评价一个人是否适合XP?”有专家说,如果有些人不理解敏捷的
We establish some results on coincidence and common fixed point for a two pair of multi-valued and single-valued maps in ultra metric spaces.
在一定简化条件下,对销钉机筒挤出机螺杆圆周展开面内的流场及分布混合效果以及销钉个数对流场和分布混合效果的影响进行了数值与实验研究.提出了流场中某点混合效果、整个流
微软公司将VisualStudio2010正式版全球发布的日子定在2010年4月,而截止1月底,VS2010Beta2版本国内下载量已超过10万人次。这充分说明了这款开发利器,在中国开发者们心中的份量
In this paper, we apply the Legendre spectral-collocation method to obtain approximate solutions of nonlinear multi-order fractional differential equations (M-F
A method for water-saving is presented in this paper. The proposed method is based on an electro mechanical approach and embedded system that is described mathe
In this paper we determine the spectrum for octagon quadrangle systems [OQS] which can be partitioned into two strongly balanced 4-kitedesigns.
In this paper, the Laplace transform definition is implemented without resorting to Adomian decomposition nor Homotopy perturbation methods. We show that the sa
Mond-Weir type duality for control problem with support functions is investigated under generalized convexity conditions. Special cases are derived. A relations