Isolation and purification of alpha-glycerophosphate oxidase in a polyethylene glycol/(NH4 )2SO4 aqueous two-phase system / 生物医学工程学杂志

Alpha-glycerophosphate oxidase (alpha-GPO) from Enterococcus casseli flavus was successfully isolated and purified by using polyethylene glycol (PEG)/(NH4)2SO4 aqueous two-phase system (ATPS). The results showed that the chosen PEG/(NH4)2SO4 ATPS could be affected by PEG molecular weight, pH, concentration of PEG and (NH4)2SO4, and inorganic salt as well as additional amount of crude enzyme. After evaluating these influencing factors, the final optimum purification strategy was formed by 16.5% (m/m) PEG2000, 13.2% (m/m) (NH4)2SO4, pH 7.5 and 30% (m/m) additive crude enzyme, respectively. The NaCl was a negative influencing factor which would lead to lower purification fold and activity recovery. These conditions eventually resulted in the activity recovery of 89% (m/m), distribution coefficient of 1.2 and purification fold of 7.0.

On the Cultivation of Humanistic Spirit for Medical Students / 中国医学伦理学

Based on the request for high quality talents of social development and the status quo of medical humanistic education,this article comes up with the conclusion that cultivation of humanistic spirit for medical students should be conducted from the following aspects.Firstly,humanistic spirit should be included in every link of the teaching course.Secondly,humanistic quality of the teaching staff should be strengthened.Last but not least,humanistic spirit should also be applied to the practice.