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Topic: Strontium


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In the News (Sun 21 Apr 19)

  
  Chemistry : Periodic Table : strontium : key information
Strontium does not occur as the free element.
Strontium titanate is an interesting optical material as it has an extremely high refractive index and an optical dispersion greater than that of diamond.
Strontium metal is available commercially and there is no need to make it in the laboratory.
www.webelements.com /webelements/elements/text/Sr/key.html   (404 words)

  
  strontium. The Columbia Encyclopedia, Sixth Edition. 2001-05
Celestite and strontianite are the chief ores of strontium.
Principal uses of strontium compounds are in pyrotechnics (chiefly the nitrate) and in greases (the hydroxide).
Strontium was first recognized as distinct from barium in 1790 by A. Crawford in a sample of its carbonate from a mine near Strontian, Scotland; his finding was later confirmed by T. Hope, M. Klaproth, and others.
www.bartleby.com /65/st/strontiu.html   (399 words)

  
 Strontium Summary
Strontium is the fourth element in Group 2 of the periodic table, a group of elements known as the alkaline earth metals.
Strontium is a bright silvery metal that is softer than calcium and even more reactive in water, which strontium decomposes on contact to produce strontium hydroxide and hydrogen gas.
Strontium was among the radioactive materials released by the 1957 Windscale fire.
www.bookrags.com /Strontium   (3818 words)

  
 Strontium (Sr)   (Site not responding. Last check: )
Strontium is a chemically reactive, malleable, ductile metallic element that was isolated by electrolysis in 1808 by the British chemist Sir Humphry Davy; however, the oxide had been known as early as 1790.
Strontium is a silvery color when freshly cut, oxidizes easily when exposed to air, and reacts with water to produce strontium hydroxide and hydrogen gas.
Strontium titanate is used as an optical material because it has an extremely high refractive index and an optical dispersion greater than that of diamond.
www.bayerus.com /msms/fun/pages/periodic/strontium/index.html   (193 words)

  
 Strontium for bone health
Jonathan Wright discussed how radio active strontium 90 could be found in human bone, and could prevent the absorption of calcium in bone, and lead to cancer.
In addition to its antiresorptive activity, strontium was found to have anabolic activity in bone, and thus may have significant beneficial effects on bone balance in normal and osteopenic animals.
These studies, the benefits of strontium ranelate (reducing fracture risk by as much as 50%) and the history of strontium in medical practice were discussed as an editorial in the New England Journal of Medicine, January 29th, 2004.
www.drhoffman.com /page.cfm/447   (873 words)

  
 strontium carbonate
Strontium carbonate is derived from strontium, one of the alkaline-earth metal elements (main Group IIa of the periodic table).
Strontium alone (in the form of the strontium-90 isotope) is notable as the principal health hazard in radioactive fallout; at the same time, however, the element has been used for the treatment of bone cancer.
Strontium carbonate is insoluble in water, but reacts with acids and will dissolve in carbonic acid and ammonium salts.
www.atomixinc.com /strontiumcarbonate.htm   (283 words)

  
 [No title]
The first studies on strontium in relation to bone density were done in the early 20th century.
Bone fluoride, strontium and calcium contents were measured in all biopsies in 100 µm-thick sections.
Strontium is often used to isolate individual quantal currents underlying evoked release (Oliet et al., 1996; Choi and Lovinger, 1997; Morishita and Alger, 1997; Otis et al., 1997; Behrends and ten Bruggencate, 1998; Lévénès et al., 1998).
www.lycos.com /info/strontium--calcium.html?page=3   (435 words)

  
 Strontium Bone Maker 60 VC   (Site not responding. Last check: )
Strontium is a bone-seeking mineral incorporated by ionic substitution for calcium onto the crystal surface of bone.
In subjects on strontium citrate, BMD increased in the lumbar vertebrae by 14.4 percent and in the thighbone by 8.3 percent.
The usefulness of strontium as an adjuvant to calcium in the remineralization of the skeleton in man. Bull Hosp Joint Dis 1952; 13:59 -66.
www.drbvitamins.com /nutritionalproducts_details.asp?id=44   (1150 words)

  
 STRONTIUM: For Osteoporosis, Arthritis
Strontium is a trace element closely chemically related to calcium and both utilize the same carrier protein for transport.
The conclusion of another published study was "Strontium ranelate given orally at 2 grams daily appears to reduce the risk of vertebral fractures rapidly, effectively and safely among postmenopausal women with osteoporosis".
Strontium in doses up to 1.7 g/day appears to offer a safe, effective and inexpensive approach to preventing and reversing osteoporosis and may be of benefit in patients with osteoarthritis and cancer with bone metastases, as well as possibly helping to prevent dental cavities.
www.essense-of-life.com /moreinfo/minerals/strontium.htm   (727 words)

  
 RAIS: Strontium-90 (10098-97-2)
Strontium is an alkaline earth metal belonging to Group IIA of the periodic table.
Following absorption, strontium is (1) distributed in an exchangeable pool consisting of the plasma, soft tissues, and exchangeable bone, (2) deposited in the bone, and (3) removed from the body by urinary and fecal excretion.
Deposition and turnover of calcium (and strontium) in the bone is dynamic and long-term deposition depends on the age of the exposed individual.
rais.ornl.gov /tox/profiles/strontium_90_f_V1.shtml   (4350 words)

  
 Strontium: Breakthrough Against Osteoporosis
Patients in the strontium group increased lumbar bone mineral density by an average of 14.4 percent and femoral neck BMD an average of 8.3 percent.
Epidemiologic studies have shown that strontium concentrations of 6 to 10 mg/liter in the water supply are associated with a reduced incidence of cavities.
Strontium in doses up to 1.7 g/day appears to offer a safe, effective and inexpensive approach to preventing and reversing osteoporosis and may be of benefit in patients with osteoarthritis and cancer with bone metastases, as well as possibly helping to prevent dental cavities.
www.worldhealth.net /p/273,5736.html   (2327 words)

  
 Strontium in Prostate Cancer   (Site not responding. Last check: )
Strontium imitates the in-vivo behaviour of calcium and is preferentially taken up by bone, concentrating at sites of high skeletal metabolic activity.
The radioactive half life of Strontium is 50.5 days with a biological half life of about 14 days in normal bone due to renal and to a lesser extent biliary excretion.
Strontium is given as a single slow intravenous injection followed by saline flush using strict guidelines for handling and administration of unsealed radioactive sources.
www.medicineau.net.au /clinical/palliative/strontium2.html   (773 words)

  
 Strontium (Sr) - Chemical properties, Health and Environmental effects   (Site not responding. Last check: )
Principal uses of strontium compounds are in pyrotechnics, for the brilliant reds in fireworks and warning flares and in greases.
Strontium chromate is known to cause lung cancer, but the risks of exposure have been greatly reduced by safety procedures in companies, so that it is no longer an important health risk.
One of the isotopes of strontium is radioactive.
www.lenntech.com /Periodic-chart-elements/Sr-en.htm   (1133 words)

  
 Strontium ranelate for preventing and treating postmenopausal osteoporosis
Strontium ranelate is a new treatment for osteoporosis therefore, its benefits and harms need to be known.
Lower doses of strontium ranelate were superior to placebo and the highest dose demonstrated the greatest reduction in vertebral fractures and increase in BMD.
There is silver level evidence (www.cochranemsk.org) to support the efficacy of strontium ranelate for the reduction of fractures (vertebral and to a lesser extent non-vertebral) in postmenopausal osteoporotic women and an increase in BMD in postmenopausal women with/without osteoporosis.
www.cochrane.org /reviews/en/ab005326.html   (615 words)

  
 Strontium | Radiation Protection Program | US EPA Information)   (Site not responding. Last check: )
Strontium (chemical symbol Sr) is a silvery metal that rapidly turns yellowish in air.
Metallic strontium was isolated in 1808 by Sir Humphry Davy.
Strontium is chemically very reactive, and is only found in compounds in nature.
www.epa.gov /radiation/radionuclides/strontium.htm   (1247 words)

  
 Chemistry and the Aquarium
Strontium carbonate (the primary crystalline form of which is called strontianite) is less soluble that calcium carbonate, which in turn is less soluble than magnesium carbonate.
In the absence of strontium, the calcification is decreased by 80%.
Strontium is present in many such foods, but not enough to have a significant impact on typical levels of strontium (~8 ppm).
www.advancedaquarist.com /issues/nov2003/chem.htm   (5799 words)

  
 Strontium information : by Ray Sahelian, M.D.
Strontium is used in the treatment of osteoporosis as a ranelate compound, and in the treatment of painful scattered bone metastases as isotope.
Strontium ranelate appears to be an effective treatment of vertebral and non-vertebral osteoporosis, however long term risks are not fully known.
Strontium ranelate is one of the first drugs to have a dual action that both decreases bone resorption and increases bone formation, according to a study presented here at the American Society for Bone and Mineral Research (ASBMR) 27th annual meeting.
www.raysahelian.com /strontium.html   (1048 words)

  
 strontium
Strontium titanate is an interesting optical material as it has an extremely high refractive index and an optical dispersion greater than that of diamond.
Natural strontium is a mixture of four isotopes; twelve other unstable isotopes are known to exist Alkaline earth metal; valence of 2; Isotopes: 88 (82.56%), 86 (9.86%), 87 (7.02%), 84 (0.56%); Heated metal combines with hydrogen to form strontium hydride and with nitrogen to form strontium nitride.
Strontium occurs in nature in celestite (strontium sulfate) use strontianite (strontium carbonate).
www.speclab.com /elements/strontium.htm   (509 words)

  
 [No title]   (Site not responding. Last check: )
For each compound, a formal oxidation number for strontium is given, but the usefulness of this number is limited for p-block elements in particular.
Strontium is found chiefly as celestite and strontianite.
The metal can be prepared by electrolysis of the fused chloride mixed with potassium chloride, or is made by reducing strontium oxide with aluminum in a vacuum at a temperature at which strontium distills off.
www.lycos.com /info/strontium--miscellaneous.html?page=2   (434 words)

  
 ATSDR - ToxFAQs™: Strontium
Strontium is a naturally occurring element found in rocks, soil, dust, coal, and oil.
Naturally occurring strontium is not radioactive and is either referred to as stable strontium or strontium.
One of the radioactive properties of strontium is half-life, or the time it takes for half of the isotope to give off its radiation and change into another substance.
www.atsdr.cdc.gov /tfacts159.html   (1002 words)

  
 Strontium Breakthrough in Bone Health Article
Mention strontium to most people, and they will almost always immediately think of strontium-90, a highly dangerous, radioactive component of nuclear fallout produced during atmospheric testing of nuclear weapons in the 1950s.
These subjects received 2 gm/day of strontium ranelate (providing 680 mg strontium) or placebo for three years.5 Calcium and vitamin D supplements were also given to both groups before and during the study.
Skoryna (1981) also tested the effect of strontium in patients with breast or prostate cancer that had spread to the bones.6 Metastatic bone cancer is usually a tragic condition with a poor prognosis, in which the cancer cells are multiplying out of control and gradually eat away the bone tissue.
www.vrp.com /art/1193.asp?c=1149006636281&k=/vrpsearch.asp&m=/includes/vrp.css&p=no&s=0   (2297 words)

  
 ENIVA CORPORATION
Research has long suggested that Strontium may be an essential nutrient required for the normal development, structure, function, and health of the skeletal system.
Strontium ranelate reduces the risk of hip fractures in women with postmenopausal osteoporosis.
The usefulness of strontium as an adjuvant to calcium in the remineralization of the skeleton in man. Bull Hosp Joint Dis.
www.enivamembers.com /ProductPage.aspx?ItemID=163&ID=azjungle   (369 words)

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