title: Role of nitrous acid in improved production of calcium gluconate by Aspergillus niger.
mesh_terms: D001230:Aspergillus / Q000187:drug effects / Q000378:metabolism*; D002118:Calcium / Q000096:biosynthesis*; D005942:Gluconates / Q000096:biosynthesis*; D009154:Mutation / Q000187:drug effects*; D009573:Nitrites / Q000494:pharmacology*; D013268:Stimulation, Chemical
chemical_list: D005942:Gluconates; D009573:Nitrites; D002118:Calcium