The literature on the antagonistic action of members of the genus Aerobacter is rather scanty. Winslow and Cohen (1918a, 1918b) reported that when a mixture of 46 per cent BaciUus aerogenes cells and 54 per cent Bacillus coli cells suspended in unsterilized tap water was stored 60 days, only 29 per cent of the remaining cells were B. coli. A slight degree of antagonism might conceivably have ex...

Social organisms that cooperate with some members of their own species, such as close relatives, may fail to cooperate with other genotypes of the same species. Such noncooperation may take the form of outright antagonism or social exploitation. Myxococcus xanthus is a highly social prokaryote that cooperatively develops into spore-bearing, multicellular fruiting bodies in response to starvatio...