Lipman N S, Corning B F, Coiro M A
Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge 02139.
Lab Anim. 1992 Jul;26(3):206-10. doi: 10.1258/002367792780740503.
Filter-top cages, while effective in reducing cross contamination by particulate material including microbes, can also cause accumulation of the waste gases carbon dioxide and ammonia as well as increased intracage relative humidity. A prototype system which provided each cage with 23 air changes per hour through a nozzle inserted in the filter lid was evaluated. The ventilated cageing system was effective in reducing intracage carbon dioxide, ammonia and relative humidity levels. Mean weekly carbon dioxide levels were 2900 ppm lower, ammonia levels 240 ppm lower and intracage relative humidity levels 8% lower in the ventilated cages than in unventilated controls.
过滤顶部的笼子虽然能有效减少包括微生物在内的颗粒物质造成的交叉污染，但也会导致二氧化碳和氨气等废气积聚，以及笼内相对湿度增加。对一种原型系统进行了评估，该系统通过插入过滤器盖子的喷嘴，每小时为每个笼子提供23次空气更换。通风笼养系统在降低笼内二氧化碳、氨气和相对湿度水平方面是有效的。与未通风的对照组相比，通风笼子的平均每周二氧化碳水平低2900 ppm，氨气水平低240 ppm，笼内相对湿度水平低8%。
