[Population dynamics of Pseudomonas aeruginosa capable of assimilating p-xylene]

The paper describes the dynamics of clones in the population of Pseudomonas aeruginosa 2x, which appear spontaneously as the result of variability in the capacity to use aromatic compounds. A culture growing on p-xylene is most homogeneous, which may be attributed to the selective action of the medium. However, the greatest number of cells capable of growth on p-xylene is found in a culture grown in a medium containing glucose.