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Annel

金虫 (小有名气)

[求助] 洁净度测试沉降法计算浮游菌

请问洁净度测试中,沉降法计算浮游菌,计算公式CFU=50000N/(AT),
沉降菌:0.31个/皿,90mm培养皿,开盖时间5min,但是计算结果是80.88个/m3,请问是怎么算出来的?按理说应该是CFU=50000*0.31/(3.14*4.5*4.5)*5=48.75,怎么算出来的80.88啊?
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lancemn

金虫 (正式写手)

【答案】应助回帖

Annel(金币+2): 2011-08-09 11:01:30
Annel(金币+3): 2011-09-30 13:40:47
CFU=50000N/(AT)?这是什么,没有这种说法。
通过CFU计算细菌菌落总数的公式为50000N/AT
N为平均菌落数=CFU/皿数,T暴露时间,A为采样皿面积。
2楼2011-08-08 09:59:50
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Annel

金虫 (小有名气)

3楼2011-09-30 13:40:33
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