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The subcellular distribution of porphyrins was evaluated
after fractionation of the cells. A pellet of l0£¨8£© cells was resuspended
in 1 ml of a solution containing Tris-HC 0.05 M, pH
7.2, 0.5 M saccarose, 0.01 M Mg-acetate and 1 mg lysozyme
(for G+ bacteria) and Tris-HCl 0.05 M, pH 6.8, 0.3 M
saccarose, 0.01 M EDTA and 1 mg lysozyme (for G- bacteria).
After 30min (G+) or 90 min (G-) incubation at
37 ¡ãC with gentle magnetic stirring the cell suspensions were
centrifuged at 3000¡Ág for 10 min. The pellets containing
either the spheroplasts or the protoplasts were resuspended
in 3 ml of 2% aqueous SDS, while the sumatants (about 1
ml) containing the cell wall were diluted with 2 ml of 3%
aqueous SDS.

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