| http://www.w3.org/ns/prov#value | - Another aspect of the invention is an apparatus for detecting the concentration of a particular substance, comprising a substrate, a luminescent microorganism such as Pseudomonas fluorescens HK44 that metabolizes a selected substance to emit light; a selectively permeable container affixed to the substrate capable of holding the luminescent microorganism and which allows gas or fluid to reach the
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