Microscopic metabolism of calcium in bone. III. Microradiographic measurements of mineral density.

The range of microscopic calcium densities in man and in dog does not change wiih the age of the individual. The ranges, however. are not the same in the two species. New bone mineral in the dog is formed at higher density than similar mineral in man, and highly mineralized bone in the dog is more dense than the most dense bone in man. Thus species differcnces in calcium metabolism of bone do exist and should not be overlooked in the intercomparison of the uptake and retention of the alkaline earths in mammalian skeletons. (auth)