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Bug trap

Bug trap

作者:随令屑  时间:2019-03-07 03:17:15  人气:

A filter launched in Britain this week could prevent outbreaks of life-threatening diarrhoea caused by Cryptosporidium, a protozoan parasite. Developed by Genera Technologies of Cambridge, the filter lets water companies screen supplies daily for the tiny spores—called oocysts—which usually evade detection. British water companies are required to fit the system before April next year. The filter traps spores in a disc of polyester foam compressed from 60 to 3 centimetres thick. This creates pores just the right size to capture oocysts (Technology, 12 April 1997, p 23). When the foam is depressurised, the cysts can be washed out,