Summary: Oxidation of several substrates by whole or broken organisms of was arrested following treatment with lysozyme, unless an osmotic stabilizer (sorbitol) were present. Whole organisms, which did not oxidize NADH, and broken organisms (which oxidized NADH only slowly) oxidized NADH readily after lysozyme treatment, though the activity was maintained only in presence of an osmotic stabilizer. Lysozyme treatment similarly allowed whole or broken to oxidize (mammalian) cytochrome or to reduce this cytochrome with appropriate electron-donors, e.g. lactate, succinate, or NADH. Most of these observations held good also for the lysozyme-sensitive but not for several lysozyme-insensitive organisms (both Gram-positive and Gram-negative).


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