空气中细菌污染的监测（Monitoring of bacterial contamination in air）.docVIP

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空气中细菌污染的监测（Monitoring of bacterial contamination in air）.doc

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空气中细菌污染的监测（Monitoring of bacterial contamination in air）

空气中细菌污染的监测（Monitoring of bacterial contamination in air） Monitoring of bacterial contamination in the air, home page, subject resources column, subject teaching resources, junior high school biology, extracurricular instruction, try Monitoring of bacterial contamination in the air is added to the favorites to add relevant resources Monitoring of bacterial contamination in air Due to lack of nutrients in the air and sunlight, not suitable for the growth of bacteria, so bacteria in the air without fixed formations. But because of the activity of people and animals and the bacteria in the soil that are dusty, air can contain different kinds of bacteria. The urban population is dense and the traffic is developed, which inevitably causes the air to be polluted. This extra-curricular activities, we have only a few different places in the city were monitored, the purpose is to understand the air hygiene, enhance students awareness of the environment, to publicize the significance of environmental protection. Materials and methods Sample source: The sampling sites include: hospital clinic, bus station, waiting room, department store, dance hall, cinema, park and Plaza, 7 places. Two 、 agar plate making: 1. Culture dish sterilization. Wash and dry the dish with 9cm inside diameter. Put it in a dry box and keep it for 2 hours at 160. 2. The medium was prepared in a triangle flask. It was cultured by 100ml distilled water and 4.4g nutrition agar. After dissolving, it was sterilized with high pressure for 7kg15 minutes. 3. The agar plate was used to cool the sterilized medium to about 50 DEG C, and the sterile medium was poured into the sterile culture dish. The medium size 9cm culture medium was about 13 to 15ml, and then it was solidified. Do not pour dish cover all open, so as not to fall into the dust and bacteria in the air. Three 、 sampling and culture: Sampling by natural sedimentation method. Each survey places with 5 plates, placed in the center of the four corners of