with alteration of the medium ph , calcium carbonate entry or loss from bone varied linearly with the initial dg for medium calcium carbonate ( r = -0.745 , n = 41 , p less than 0.001 ) as it did with alteration of the medium calcium and phosphate ( r = -0.665 , n = 118 , p less than 0.001 ) .
C0006681
calcium carbonate
C0006675
calcium