Abstract
Protoplasts of Azotobacter vinelandii were formed by incubating whole cells in lysozyme and EDTA in Tris-HCl buffer (0.05 M, pH 8.0) supplemented with sucrose (15% w/v). This appeared to be related to the special chelating ability of EDTA and Tris-HCl since substitution of the former by nitrilotriacetic acid or by trisodium citrate and the latter by veronal-acetate buffer or tris-maleate buffer over a pH range of 5.2 to 8.6 yielded only spheroplasts. Of nine strains of Azotobacter studied, only A. vinelandii strain 12837 and strain 0 formed protoplasts.
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