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Radioactive isotopes of strontium (59Sr and '*Sr) are generally regarded as the most dangerous of the products of nuclear fission. The passage of radiostrontium deposited on soil and vegetation into the human diet has therefore received considerable attention. Since strontium is similar to calcium in its metabolic behaviour it has become common practice to(More)
Natural killer (NK) cell activity of spleen cells from male CBA/J mice was augmented by a single parenteral injection of MnCl2 administered 1 day prior to testing by in vitro and in vivo isotope release assays. Increased cytotoxic activity was observed in vitro against both NK-sensitive (YAC-1) and NK-resistant (EL-4) target cells. NK activity was also(More)
Natural killer (NK) cell activity of mice given a single injection of manganese chloride (MnCl2) was significantly enhanced as measured in a 4-hr in vitro 51Cr release assay. Enhanced activity persisted for several days after injection. This cytotoxic activity was associated with nonadherent spleen cells and was completely eliminated by injecting(More)