The assurance mode from laser source for medicine is brought forward based on the three-tier mode of the whole assurance system in equipment of scientific research that is in the measurement of quality control personnel, engineering technique personnel and operator. The successful implementation of model will do laboratory equipment for the conditions of security work to a new level in our academy that can play important protection effect in overall research tasks.

Objective:To establish a method for measuring the activity of cornea epithelium quantitatively. Methods:Rabbit corneas were burnt either by alkali or by CO2 laser. The lamellar cornea was cut at the end of 1,2 and 3 weeks and cultured in 2 ml DMEM with 5% CO2, 37℃ for 1 h.Then 200 μl of MTT was added to the culture followed by incubation for another 4 h. The supernatant was discarded and 4 ml of DMSO was added into each culturedish for dissolving MTT completely under the condition of room temperature.200 μl of DMSO sample was added to each well of 96-well plate and each sample was triplicated. The absorbance of the plate was measured at 490 nm ultraviolet. Results:The D value of the burnt corneas was obviously lower than that of the normal ones(P<0.01). Conclusion:MTT method can be used to measure the activity of cornea epithelium quantitatively.