THE BACTERIOPHAGES OF BACILLUS MEGATERIUM II

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Abstract
The effects of mono- and divalent ions on the 5 phages of the "M" system were investigated. While monovalent cations in 0.1 [image] concns. were completely viricidal for the morphological group (Ml, M2, M3, and M5), the ions showed a much smaller effect on M4. In all cases the viruses were more stabile in dist. water than in monovalent ion salts below 1 [image] concn. The addition of 0.001 [image] of a number of divalent cations completely protected Ml, M2, and M3. However, this effect was ion variable and incomplete with M4 and M5. This shows that complete protection with divalent ions is confined to the serologically related members of the system (Ml, M2, and M3).

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