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According to prevailing theories, successful ion exchange is likely when the size of the cation does not deviate by more than 15% from that of the Ca 2+ ion, which has a radius of 0.099 nm (Saleeb & De Bruyn, 1972)
The findings, published recently in the Archives of Internal Medicine, showed that about one-third of the 1,080 doctors surveyed said they dont routinely ask new patients if they use drugs, and 15 percent said they do not generally suggest interventions for drug-abusing patients
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