Inhibition of calcium absorption by dietary strontium is the result of a block in the renal synthesis of 1,25-dihydroxycholecalciferol (1,25-(OH)&C) from 25-hydroxycholecalciferol (25-OHCC). The administration of 1,25-(OH)&C but not 25-OHCC restores to normal calcium absorption in strontium-fed chicks. Kidney mitochondria from strontium-fed chicks do not metabolize 25-OHCC to 1,25-(OH)&C, but r...

Inhibition of calcium absorption by dietary strontium is the result of a block in the renal synthesis of 1,25-dihydroxycholecalciferol (1,25-(OH)&C) from 25-hydroxycholecalciferol (25-OHCC). The administration of 1,25-(OH)&C but not 25-OHCC restores to normal calcium absorption in strontium-fed chicks. Kidney mitochondria from strontium-fed chicks do not metabolize 25-OHCC to 1,25-(OH)&C, but r...

In March 2011, enormous radioactive materials, mainly 137Cs, 129I, 90Sr and so on were released from the Fukushima Daiichi nuclear power plant after The Great East Japan Earthquake. Tap water, raw milk, vegetables, mushrooms, fruit, nuts, seaweed, marine invertebrates, fish, beef, wild animal meat, brown rice, wheat, tea leaves and other foodstuffs were contaminated by many radionuclides. In pa...

Strontium can be deposited in bone apatite either by the replacement of surface adsorbed calcium, or by substitution for intracrystalline calcium (1-3). It has also been reported that both of these processes favor the deposition of calcium to that of strontium (3). This report is concerned with the comparative incorporation of calcium and strontium in synthetic apatites. We shall present eviden...

A series of heteroleptic strontium complexes (1-9) using a combination of different aminoalkoxides and 2,2,6,6-tetramethyl-3,5-heptanedionate (tmhd) were prepared to examine the effect of the bulkiness and coordination ability of the aminoalkoxide ligand in these complexes as well as potential strontium precursors. All complexes were characterized by FT-IR, FT-NMR, elemental analyses, and therm...

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 study the simultaneous behaviour ofthe...

In this demonstration, we show a qualitative analysis of sulfite ions in white wine with strontium ions. In base solution, a white precipitation occurs from strontium sulfite that disappears after a strong acid is added. This demonstration nicely illustrates chemical equilibrium in a school chemistry experiment.

We report a case of tumor regression of multiple bone metastases from breast carcinoma after administration of strontium-89 chloride. This case suggests that strontium-89 chloride can not only relieve bone metastases pain not responsive to analgesics, but may also have a tumoricidal effect on bone metastases.