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สารฮิ วมิ กช่วยเพิ่ มความสามารถการลดสี ... 204 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 The dyes were provided by Dystar Thai Ltd., and not further purified. The absorption maxima and molar extinction coefficients were determined in Na-K phosphate buffer (50 mM; pH 7.5). A. Remazol Brilliant Orange 3R B. Remazol Black B C. Remazol Brilliant Violet 5R FIG. 1. Chemical structure of the sulfonated azo dyes used in this study. Remazol Brilliant Orange 3R reactive orange 16 17757 495 15.4 Remazol Brilliant Violet 5R reactive violet 5 18097 557 6.8 Remazol Black B reactive black 5 20505 595 29.1 a The dyes were provided by Dystar Thai Ltd., and not further purified. The absorption maxima and molar extinction coefficients were determined in Na-K phosphate buffer (50 mM; pH 7.5). A. Remazol Brilliant Orange 3R B. Remazol Black B C. Remazol Brilliant Violet 5R FIG. 1. Chemical structure of the sulfonated azo dyes used in this study. FIG.1 Chemical structure of the sulfonated azo dyes used in this study. Quinone component(s) in cell membrane of strain A5 Newman and Kolter have recently shown that there is a common biochemical basis for AQDS and humic acid respiration involving the biosynthesis of menaquinone, a lipophilic naphthoquinone with a prenyl side chain of variable length that participates in the transfer of electrons to low-potential electron acceptors and normally found within the lipid bilayer of cell membrane (34). Every Bacillus sp. so far examined contains menaquinone as the sole quinone component and general absence of ubiquinone (33). Like all the other bacilli, lipid extraction of culture grown aerobically showed that only menaquinone was found in Pae- nibacillus sp. strain A5. (as assayed by thin layer chromatography). Thin layer chromatography also revealed that menaquinone was not present in the supernatants of strain A5.