Barium sulfate 1 (BaSO 4) is also known as barite, the mineral in which it is found, its principal use is as a densifying additive to oil well drilling fluids, or “muds”.
No extract is available for articles shorter than 400 words. I am indebted to Dr. J. L. Tullis and the members of the Blood Characterization and Preservation Laboratory, Harvard University, for ...
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