本试验综合采用超滤法、缓冲盐法、流加碱中和法、离心法浓缩菌体，优选工艺路线，为规模化生产奠定基础。
This thesis use the methods of ultra-filtration, phosphate buffer, flowing-alkaline, centrifugal to concentrate the Yoghurt starter, and optimize the processing techniques of it.
为开发生物法生产6-羟基烟酸，利用快速筛选方法从多个地区的土壤中筛到了一株能高效羟化烟酸为6-羟基烟酸的菌株BK-1，可以用菌体催化得到高纯度的6-羟基烟酸。
In order to explore a biological process to produce 6-hydroxynicotinic acid, a strain, named BK-1, was rapidly isolated by a novel screening protocol from soil samples in various districts.
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