title: The preparation of antigens of Rhizobium meliloti by ultrasonic disruption: an anomaly.
mesh_terms: D000937:Antigen-Antibody Reactions; D003956:Dialysis; D006358:Hot Temperature; D007106:Immune Sera; D005779:Immunodiffusion; D012231:Rhizobium / Q000276:immunology*; D014465:Ultrasonics
chemical_list: D007106:Immune Sera