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Two novel Bacillus sp. were isolated from a soil sample from a bank of the  Tamiš river in close proximity to a petrochemical facility. They were capable  of utilizing a broad range of aromatic compounds as a sole source of carbon  and energy (including phenol, benzene, toluene, biphenyl, naphthalene). The  isolates were designated as Bacillus sp. TN41 and TN42, based on their 16S  rDNA sequence. Their catabolic potential was compared to two Bacillus sp.  strains (PS1 and PS11) isolated from the rhizosphere of the endemorelict  plant Ramonda serbica. Specific activities of phenol hydroxylase, catechol  1,2-dioxygenase and catechol 2,3-dioxygenase were analyzed from crude cell  extracts of the isolates, as well as the temperature and pH effects on enzyme  activity. Although all four isolates had the ability to degrade a similar  range of aromatic compounds, the specific activities of the enzymes  indicative of aromatic compound catabolism of TN isolates were 2 to 90-fold  lower compared to the PS isolates. Phenol hydroxylase and catechol  dioxygenases exhibited broad temperature (10°C-80°C) and pH (4-9) activity  ranges in all four Bacillus isolates. While phenol inhibited both phenol  hydroxylase and catechol dioxygenases in the TN strains, it was an inducer  for phenol hydroxylase in the PS strains

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Four Bacillus sp. soil isolates capable of degrading phenol, toluene, biphenyl, naphthalene and other aromatic compounds exhibit different aromatic catabolic potentials