title: The effect of calcium nutrition on the production of diffusible antigens by Rhizobium trifolii.
mesh_terms: D000371:Agglutination; D000941:Antigens; D002118:Calcium / Q000494:pharmacology*; D002473:Cell Wall; D005559:Formamides / Q000494:pharmacology; D007106:Immune Sera; D005779:Immunodiffusion; D066298:In Vitro Techniques; D009113:Muramidase / Q000494:pharmacology; D012231:Rhizobium / Q000276:immunology*
chemical_list: D000941:Antigens; D005559:Formamides; D007106:Immune Sera; D009113:Muramidase; D002118:Calcium