表达系统

• According to the method of rs , knowledge induction is to obtain all the minimum decision algorithms based on the condition - attributes and decision - attributes of given knowledge system
  根据粗集理论的方法，知识推理就是由给定的知识表达系统的条件属性和结果（决策）属性，求出所有符合该知识的最小决策算法。
• However , the drawbacks of mammalian cell expression systems are apparent : they are difficult to culture in large scale , especially in serum - free medium ; the productivity is much lower than other expression systems and the costs are higher
  但哺乳动物细胞表达系统的缺点也很明显，如表达量低、大规模培养困难、生产成本高昂等。
• Thus , strenghtening the basic biology theorical study of the engineering cell and seeking the better cell system for the baculovirus of silkworm are current needs for the study of silkworm expression system
  因此，加强对工程细胞的生物学基础理论研究，寻找更适宜于家蚕杆状病毒表达系统的家蚕细胞系是当前家蚕表达系统研究发展的需要。
• Therefore , we hope to construct a effective eukaryotic gene expressing vector harboring a genomic dna , including introns , and develop a gene expressing system could correctly splice the mrna
  为此，我们希望构建和探索一种能有效高表达含有内含子真核基因组的载体和能对内含子进行剪切加工的昆虫表达系统，以提高外源真核基因表达的有效性和可靠性。
• Take transgenic plant as bioreactor to produce t - pa will come to hot point of research because of its low costing , high safety of product , convenient for producing , saving and transport on a large scale
  由于植物表达系统具有生产成本较低、表达产物安全性高、便于大规模生产和储运等特点，因此以转基因植物为生物反应器生产t - pa目前已成为研究热点。
• The main content of the paper is as follows : firstly , this paper introduces the knowledge representation system and decision tables and the concept of decision table reduction , then puts forward the algorithm for each phase of the reduction
  本文主要内容如下：首先引入了知识表达系统和决策表，介绍了决策表简化的概念并提出了其简化各阶段相应的算法。
• In addition , we also focused on constructing a plant virus - based gene vector pvx to express ltb - st fused gene by means of agroinfection . the possibility of producing vaccine was probed through plant virus - based gene vector expression system
  同时本研究还通过构建ltb ? st融合基因pvx病毒表达载体，并用农感染法转化植物，探索了暂态表达系统生产疫苗的可能性。
• This has resulted in the availability of genetically modified l . lactis with prospects for application in food industry . in this studay , genomic dna extracted from lactococcus lactis nizo r5 was used directly as the template for pcr in this paper
  乳酸乳球菌是一类长期应用于食品发酵业的有益微生物，以乳酸菌为受体的表达系统具有安全、表达产物便于分离，使用方便等优点。
• It was applied widely to various fields of biology , medicine and agriculture . as engineering cells in the insect baculovirus expression system , insect cells have close relationship with to transform and expression efficiency in the expression system
  昆虫细胞作为昆虫杆状病毒表达系统中的工程细胞，与表达系统的转化和表达效率密切相关，因此，昆虫细胞的研究对于表达系统的开发具有深远的影响作用。