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Naphthalene degrading bacteria

Fig. 3. Plots of initial mineralization rates (IMR) versus equilibrium aqueous phase concentrations for naphthalene-degrading bacteria. Open circles represent Capac soil, closed circles represent Colwood soil, and squares represent soil-free control data points. Reprinted with permission from Guerin and Boyd (1992). Copyright (1992) American Society for Microbiology. Fig. 3. Plots of initial mineralization rates (IMR) versus equilibrium aqueous phase concentrations for naphthalene-degrading bacteria. Open circles represent Capac soil, closed circles represent Colwood soil, and squares represent soil-free control data points. Reprinted with permission from Guerin and Boyd (1992). Copyright (1992) American Society for Microbiology.
Figure 5. Bioluminescent light emissions from colonies of engineered naphthalene degrading bacteria which respond as bioluminescent reporters of degradative activity. Figure 5. Bioluminescent light emissions from colonies of engineered naphthalene degrading bacteria which respond as bioluminescent reporters of degradative activity.
The reactions, described so far, are derived from tiie most extensively studied catabolic pathway for naphthalene, which is encoded by the NAH7 plasmid of Pseudomonas putida. But, the same sequence of reactions seems to take place in all naphthalene-degrading bacteria, which means that salicylate is a common intmmiediate in naphthalene catabolism. With respect to the enzymes involved in the breakdown of naphthalene, there seem to exist differences between the bacterial species, that can grow on naphtiialene-containing media. A recently isolated and described Rhodococcus sp., for example, seems to have a 1,2-dihydroxynaphthalene oxygenase that requires NADH [38]. [Pg.105]

Figure 6. Remote sensing of light emission from naphthalene degradative bioluminescent reporter bacteria in sandy aquifer lab simulation. (Y axis, relative light output ... Figure 6. Remote sensing of light emission from naphthalene degradative bioluminescent reporter bacteria in sandy aquifer lab simulation. (Y axis, relative light output ...
Figure 1. Catabolic pathways for degradation of naphthalene by bacteria. I, naphthalene II, cis-l,2-dihydro-l,2-dihydroxynaphthalene (naphthalene dihydrodiol) III, l,2-dihydrox3maphthalene IV, 2-hydroxy-chromene-2-carboxylate V, mns-o-hydroxybenzyIidene pyruvate VI, salicylaldehyde Vn, salicylate VIII catechol IX, c 5,ci8-muconate semialdehyde X, cis,ci8-muconate XI, gentisate XII, maleylpyruvate. Figure 1. Catabolic pathways for degradation of naphthalene by bacteria. I, naphthalene II, cis-l,2-dihydro-l,2-dihydroxynaphthalene (naphthalene dihydrodiol) III, l,2-dihydrox3maphthalene IV, 2-hydroxy-chromene-2-carboxylate V, mns-o-hydroxybenzyIidene pyruvate VI, salicylaldehyde Vn, salicylate VIII catechol IX, c 5,ci8-muconate semialdehyde X, cis,ci8-muconate XI, gentisate XII, maleylpyruvate.
A recent experiment compared for the first time pollutant degradation by chemotactic bacteria and nonchemotactic mutants [54]. The result suggested an important role of chemotaxis in the bioremediation of contaminated soils. In a heterogeneous system, in which naphthalene was supplied from a microcapillary, a 90% reduction in the initial amount of naphthalene took six hours with the chemotactic wild-type Pseudomonas putida PpG7, while a similar reduction with either a chemotaxis-negative or a nonmotile mutant strain took about five times longer. Only the systems inoculated with the chemotactic strain exhibited degradation rates in excess of the rate of naphthalene diffusion from the... [Pg.415]

One of the strategies applied to enhance the degradation of specific PAH is to offer bacteria one or more known inducers to stimulate both selective growth of PAH degraders and induction of PAH metabolism [38, 73,132,148,182,194], However, little has been reported on the regulation of PAH metabolism by bacteria for compounds other than naphthalene. The transformation of benz[a]-anthracene was found to be inducible by salicylate [188] in a strain that has recently been identified as Sphingomonas yanoikuyae [172], but little else is known about the regulation of the metabolism for HMW PAH. [Pg.382]

The plasmids and operons described above represent the most studied ones, but probably constitute a small fraction of the catabolic operons in bacteria. In one study, 43 bacterial strains (mostly Pseudomonas spp.) from different sources, shown to possess the ability to degrade aromatic and PAHs, were hybridized with probes of NAH and TOL plasmids as well as with genomic DNA of bacteria known to degrade a wide variety of PAHs. Only 14 strains that mineralized naphthalene and phenanthrene showed homology to one of the probes. The remaining isolates mineralized and/or oxidized various PAHs and hybridized with neither pure plasmids nor genomic DNA (Foght Westlake, 1991). [Pg.108]


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Naphthalene degradation

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