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Aromatic compounds are a large group of organic molecules originated from biological or chemically synthesized.Chemically synthesized aromatic compounds are often used as rawstocks for production of many commercial products such colorants,persticides,herbicides,etc.,and the biological/natural aromatic compounds are used as building block for biomass or signal molecules by many prokaryotes or eukaryotes.Recycle of chemical elements of aromatic compounds are mainly dependent on microbial activities in natural environments such as soil,water,and sediments.Comamonas testosteroni CNB-1 was isolated from a wastewater treatment plant receiving wastewater from chemical industry producing nitroaromatic compounds.CNB-1 has robust ability to degrade and grows on a range of aromatic compounds,including chloronitrobenzene,nitrobenzene,benzoate,hydroxylated benzoates,etc.In addition,CNB-1 has the ability to respond chemical gradient of aromatic compounds in environment(chemotaxis).It was demonstrated that CNB-1 was associated with plants and was able to remove chloronitrobenzene from polluted soil.This lecture will summarize the knowledge of physiology and genetics of aromatic metabolism,as well as recently progresses on understanding of the chemotactic responses to aromatic compounds by CNB-1.