The bleached natural shellac product with low chlorine content was prepared by means of catalytic hydrogenation of the bleached shellac in the presence of Ni-Fe binary-metal catalyst and hydrogen.
制备和表征了在食品及制药业中广泛使用的天然低氯漂白紫胶。
Conclusion: All the three disinfection methods have certain killing effect on the natural bacteria in air, but chlorine dioxide aerosol spray has the best efficacy and its dosage is low.
结论，三种消毒法对空气中自然菌都有杀灭作用，但以二氧化氯气溶胶喷雾法效果最好且用药量低。
Objective To understand the survival time of Leptospira Interrogans in different type of natural waters, and the disinfection effect of chlorine-containing disinfectant and its affecting factors.
目的了解钩端螺旋体在不同自然水体中的存活时间，并研究含氯消毒剂杀灭钩体及其影响因素。
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