抄録
Antiphage sera were produced in rabbits against the HM-phages of Clostridium sac-charoperbutylacetonicum; on the basis of cross-neutralization experiments with homologous and heterologous antisera, the twelve HM-phages were classified into three serological groups, termed I, II and III. Group I contained seven phages, i. e., HM 1, HM 2, HM 8, HM 9, HM 10, HM 11 and HM 12. Group II contained four phages, i. e., HM 3, HM 4, HM 5 and HM 6, and group III one phage, i. e., HM 7. This classification was in accord with morphological one that was reported in the preceding paper. By using the K value of antisera, the degree of serological relatedness among the phages within groups I and II was demonstrated. On the bases of serological similarities and of dis-similarities in host-rang specificity, the phages of groups I and II are considered as host range mutants derived from an identical ancestor, HM 1 and HM 3, respectively.
