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Chromatophores of the mutant T4 (TyrL222 -> Phe) from Rhodopseudomonas viridis, resistant toward the triazine herbicide terbutryn (2-methylthio-4-ethylamino-6-tertbutylamino-s-triazine), were studied by EPR and optical spectroscopy. IC 50 values were measured with electron transfer inhibitors of the triazine, triazinone, phenol and urea classes. The mutant T4 is the first purple bacterium...
Comparison of the Stark effect on the Q y transitions of the pigments in reaction centers of Rb. sphaeroides and Rps. viridis at 77 K shows great similarity in the long-wavelength absorption of the bacteriochlorophyll dimer but differs significantly in the absorption region of the accessory bacteriochlorophylls and bacteriopheophytins.
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