Methods from 2010 September to October in Linzi District, all two water supply system for high-rise buildings in general, physicochemical and hygienic indicator bacteria survey.

方法：2010年9月至10月对临淄区城区所有高层建筑二次供水系统进行一般情况、理化和卫生细菌指标调查。

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He proposes that for bacteria living in a dry environment, where molecules could not easily diffuse between colonies, airborne ammonia could serve as an important indicator of nitrogen sources.

他认为，对于身处干燥环境中的细菌来说，分子不易在菌落之间进行扩散，而空气中的氨就可以作为一重要的营养源的指示信息。

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Thus, using luminous bacteria as indicator of bioassay for monitoring the concentration of certain pesticides and herbicides are simple, fast, and sensitive.

因而用发光细菌作指示生物测定部分农药和除草剂的浓度是一种简便，快速、灵敏的方法。

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Indicator organisms are bacteria which are found in soil and water and in the faeces of animals.

BBC: Carrots