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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Use of protoplasts from paired heterogenic bacterial species to detect tin contaminants: Prospects for biosensor development.

Two different bacteria gave different respiratory responses to the test analytes, tributyl tin (TBT) and cadmium as expressed by positive sigmoid responses by Halomonas sp. (slope, +1.71 [TBT]; +1.76 [Cd]) and negative sigmoid responses by Bacillus pumilis (slope, -1.06 [TBT]; -0.59 [Cd]). The EC(50) values determined from Hill plots for the response of Halomonas sp. to the TBT and Cd were 1 and 8.5mM, respectively, which were lower by a factor of 10 than the corresponding values for B. pumilis. With protoplasts of B. pumilis there was a major shift in the signal from sigmoid negative to positive with TBT (+1.35) but not Cd (-0.5), while the signals with the remaining protoplast-analyte combinations remained unchanged. For all four protoplast-analyte combinations the EC(50) values were in the order of 10-100-fold lower than those for their whole cell counterparts. When other analytes were tested the protoplasts gave a similar response to tin as for TBT, but detected copper and 2,4-dichlorophenol with similar signal profiles to Cd and with lower sensitivity. The difference in signal and higher sensitivity of the two species protoplast system towards TBT/tin compared to the other analytes tested, suggests that it may feasible to develop this approach for the detection of tin residues.[1]

References

  1. Use of protoplasts from paired heterogenic bacterial species to detect tin contaminants: Prospects for biosensor development. Mountfort, D., Laczka, O., Debarnot, C., Bonnin, A., Pasco, N., Lloyd-Jones, G. Biosensors & bioelectronics (2007) [Pubmed]
 
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