CHEMISTRY OF CELL WALLS 53 



to walls from both Gram-positive and Gram-negative groups 

 o£ bacteria, and these can be identified by characteristic 

 components such as DAP, muramic acid, and o-isomers of 

 alanine and glutamic acid. However, the arrangement of 

 the mucopeptide constituents in the walls of Gram-negative 

 bacteria may differ in that they form a reinforcing net- 

 \vork rather than a continuous sheet of the polymer. The 

 fact that the isolated walls of Gram-negative bacteria can be 

 completely disaggregated by sodium dodecyl sulfate strongly 

 suggests this idea.'^ 



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