title: The effect of some divalent cations on extracellular polysaccharide synthesis in Streptococcus salivarius.
abstract: The amount of extracellular insoluble polysaccharide produced by Streptococcus salivarius can be effected by some divalent cations. Calcium at concentrations of 1 X 10(-3) and 10(-4) M caused a reduction in polysaccharide synthesis. Magnesium at 1 X 10(-3) M inhibited extracellular polysaccharide production but at 1 X 10(-4) M had little effect. Manganese was without effect on polysaccharide synthesis. Zinc at 1 X 10(-3) and 1 X 10(-4) M caused a substantial increase in extracellular polysaccharide synthesis.
mesh_terms: D002118:Calcium / Q000494:pharmacology; D002413:Cations, Divalent / Q000494:pharmacology*; D008274:Magnesium / Q000494:pharmacology; D008345:Manganese / Q000494:pharmacology; D011135:Polysaccharides, Bacterial / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D013291:Streptococcus / Q000187:drug effects* / Q000378:metabolism; D015032:Zinc / Q000494:pharmacology
chemical_list: D002413:Cations, Divalent; D011135:Polysaccharides, Bacterial; D008345:Manganese; D008274:Magnesium; D015032:Zinc; D002118:Calcium