Abstract
Bacteriophage P7 combines reversibly with the debris of bacteria, lysed by itself. Though this combined phage is dissociated by heating or by diluting with distilled water, 0.1 Mol NaCl, or 0.01 Mol MgSO4, it is not dissociated by diluting with 0.01 Mot MgCl2 nor 0.01 Mol CaCl2. Moreover, heating leads to dissociation in case of 0.01 Mol MgCl2 as in broth, but in case of 0.01 Mol CaCl2, heating is of no effect.
These characters of dissociation are quite similar to the characters of dissociation in the attachment between heat-killed bacteria and the bacteriophage P7, therefore it seems to be a specific attachment between the phage and phage-receptor which is left on the bacterial debris.
