臭氧对真菌杀灭作用的初步研究

以根霉 ,黑曲霉 ,青霉 ,酵母菌等为研究对象 ,测定了放电时间与致死率的曲线关系 ,并观察了与空白对照后其菌落形态的变化。实验结果表明 ,随着放电时间的增长 ,致死率明显升高 ,且能够达到完全杀菌。     

STERILIZATION OF SUSPENDED SEDIMENTS BY GAMMA RADIATION

SUMMARY

Gamma radiation as an alternative sterilization technique for silt and clay suspensions is evaluated. It is compared to autoclaving in regard to sterility and changes in physical and chemical properties of the suspensions. A minimum radiation dose rate of 5 kGy s^?1 led to sterilization and no changes in lattice structure or precipitation of the suspensoids were observed. The adsorbed ionic composition of the silt and clay particles was, however, altered and should be rectified before radiated suspensoids are used. Autoclaving resulted in sterility, but irreversible precipitation of the suspensoids made it less applicable where the colloidal properties of the clay and silt are to be maintained.     

DIFFERENTIATION OF OXYHEMOGLOBINS BY MEANS OF MUTUAL SOLUBILITY TESTS

1. The rule of addition of solubilities is applicable to the differentiation of the oxyhemoglobins of not too closely related species. 2. The oxyhemoglobins of the horse, dog, rat, and guinea pig show differences when tested by this method. The oxyhemoglobins of the donkey and horse show a similarity which is best explained by the assumption of isomorphism.