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Annealing experiments on membrane filters were carried out with deoxyribonucleic acids (DNA) from selected strains of the nomen-species ofPseudomonas, Actinobacillus, Chromobacterium , andMicrococcus , with the use of DNA ofPseudomonas pseudomallei andActinobacillus mallei as reference materials. Under the usual conditions employed in these experiments, the results were not quantitatively reproducible. Incorporation of dimethylsulfoxide (DMSO) into the incubation medium greatly increased differences in comparative binding. DNA binding in agar matrices was examined in the presence and absence of DMSO at various incubation temperatures. It was found that the greatest specificity, stability, and total binding for DNA containing high amounts of guanine and cytosine occurred in the presence of DMSO. Under the most stringent annealing conditions permitted in agar, DNA species fromP. pseudomallei andA. mallei in the presence of DMSO demonstrated interspecific relative bindings of 76 to 86% when compared to the homologous reactions. The thermal elution midpoints (Em ) of these duplexed interspecific DNA species were quite close to the homologous Em values. The relative bindings ofP. multivorans DNA types to either reference DNA ranged between 6 to 27%, and the Em values were 4 to 7 C less than those for the homologous reactions.

Nucleic Acid Similarities Among Pseudomonas pseudomallei, Pseudomonas multivorans , and Actinobacillus mallei