同: magnesium ion

同: magnesium ion

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the 13th letter of the Roman alphabet (同)m

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Mach number / mark[s] / Monsieur
magnesiumの化学記号

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/09 15:26:34」(JST)

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Magnesium is a chemical element with symbol Mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (Group 2, or alkaline earth metals) of the periodic table: they each have the same electron configuration in their outer electron shell producing a similar crystal structure.

Magnesium is the ninth most abundant element in the universe.^[4]^[5] It is synthesized in large, aging stars from the sequential addition of three helium nuclei to a carbon nucleus. When such a star explodes as a supernova, much of its magnesium is expelled into the interstellar medium, where it can be recycled into new star systems. Consequently, magnesium is the eighth most abundant element in the Earth's crust^[6] and the fourth most common element in the Earth (below iron, oxygen and silicon), making up 13% of the planet's mass and a large fraction of the planet's mantle. It is the third most abundant element dissolved in seawater, after sodium and chlorine.^[7]

Magnesium only occurs naturally in combination with other elements, where it invariably has a +2 oxidation state. The free element (metal) can be produced artificially, and is highly reactive (though once produced, it is coated in a thin layer of oxide, which partly inhibits this reactivity — see passivation). The free metal burns with a characteristic brilliant-white light, making it a useful ingredient in flares. The metal is now obtained mainly by electrolysis of magnesium salts obtained from brine. In commerce, the chief use for the metal is as an alloying agent to make aluminium-magnesium alloys, sometimes called magnalium or magnelium. Since magnesium is less dense than aluminium, this alloy is prized for its properties of lightness combined with strength.

Magnesium is the eleventh most abundant element by mass in the human body. Its ions are essential to all cells. They interact with polyphosphate compounds such as ATP, DNA, and RNA. Hundreds of enzymes require magnesium ions to function. Magnesium compounds are used medicinally as common laxatives, antacids (e.g., milk of magnesia), and to stabilize abnormal nerve excitation or blood vessel spasm such as in eclampsia. Magnesium ions are sour to the taste, and in low concentrations they help impart a natural tartness to fresh mineral waters. Magnesium is the metallic ion at the center of chlorophyll, and is a common additive to fertilizers.^[8]

1 Characteristics
- 1.1 Physical properties
- 1.2 Chemical properties
  - 1.2.1 Flammability
  - 1.2.2 Source of light
- 1.3 Occurrence
2 Forms
- 2.1 Alloy
  - 2.1.1 Corrosion
  - 2.1.2 High-temperature creep and flammability
- 2.2 Compounds
- 2.3 Isotopes
3 Production
4 History
5 Uses as a metal
- 5.1 Aircraft
- 5.2 Automotive
- 5.3 Electronics
- 5.4 Other
- 5.5 Safety precautions
6 Uses in compounds
7 Biological roles
- 7.1 Mechanism of action
- 7.2 Dietary sources, recommended intake, and supplementation
- 7.3 Metabolism
- 7.4 Detection in serum and plasma
- 7.5 Deficiency
- 7.6 Therapy
- 7.7 Overdose
- 7.8 Function in plants
8 See also
9 Notes
10 References
11 External links

Characteristics

Physical properties

Elemental magnesium is a gray-white lightweight metal, two-thirds the density of aluminium. It tarnishes slightly when exposed to air, although, unlike the other alkali metals, an oxygen-free environment is unnecessary for storage because magnesium is protected by a thin layer of oxide that is fairly impermeable and difficult to remove. Magnesium has both the lowest melting and the lowest boiling points of any of the alkali earth metals, at 923 K (1,202 °F) and 1,363 K (1,994 °F), respectively.^[9]

Magnesium reacts with water at room temperature, though it reacts much more slowly than the similar earth alkali metal calcium. When submerged in water, hydrogen bubbles almost unnoticeably begin to form on the surface of the metal—though, if powdered, it reacts much more rapidly. The reaction occurs faster with higher temperatures (see precautions). Magnesium's ability to react with water can be harnessed to produce energy and run a magnesium-based engine.

Magnesium also reacts exothermically with most acids, such as hydrochloric acid (HCl). This reaction with HCl produces the chloride of the metal and releases hydrogen gas (just as when HCl reacts with aluminium, zinc, and many other metals).

Chemical properties

Flammability

Magnesium is a highly flammable metal, especially when powdered or shaved into thin strips; (it is, however, difficult to ignite in mass or bulk). Flame temperatures of magnesium and magnesium alloys can reach 3,100 °C (3,370 K; 5,610 °F),^[10] although flame height above the burning metal is usually less than 300 mm (12 in).^[11] Once ignited, it is difficult to extinguish, being able to burn in nitrogen (forming magnesium nitride), carbon dioxide (forming magnesium oxide, and carbon) and water (forming magnesium oxide and hydrogen). This property was used in incendiary weapons used in the firebombing of cities in World War II, the only practical civil defense being to smother a burning flare under dry sand to exclude the atmosphere. Magnesium may also be used as an ignition source for thermite, a mixture of aluminium and iron oxide powder that is otherwise difficult to ignite.

Source of light

On burning in air, magnesium produces a brilliant-white light that includes strong ultraviolet. Thus, magnesium powder (flash powder) was used as a source of illumination in the early days of photography. Later, magnesium ribbon was used in electrically ignited flashbulbs. Magnesium powder is used in the manufacture of fireworks and marine flares where a brilliant white light is required.

Occurrence

Magnesium is the eighth-most-abundant element in the Earth's crust by mass and tied in seventh place with iron in terms of molarity.^[6] It is found in large deposits of magnesite, dolomite, and other minerals, and in mineral waters, where magnesium ion is soluble.

Although magnesium is found in over 60 minerals, only dolomite, magnesite, brucite, carnallite, talc, and olivine are of commercial importance.

The Mg2+
cation is the second-most-abundant cation in seawater (occurring at about 12% of the mass of sodium there), which makes seawater and sea-salt an attractive commercial source of Mg. To extract the magnesium, calcium hydroxide is added to seawater to form magnesium hydroxide precipitate.

MgCl
2 + Ca(OH)
2 → Mg(OH)
2 + CaCl
2

Magnesium hydroxide (brucite) is insoluble in water, so it can be filtered out and reacted with hydrochloric acid to obtain concentrated magnesium chloride.

Mg(OH)
2 + 2 HCl → MgCl
2 + 2 H
2O

From magnesium chloride, electrolysis produces magnesium.

Forms

Alloy

As of 2013, magnesium alloy consumption was less than one million tons per year, compared with 50 million tons of aluminum alloys. Its use has been historically limited by its tendency to corrode, high-temperature creep, and flammability.^[12]

Corrosion

The presence of iron, nickel, copper, and cobalt strongly activates corrosion. This is due to their low solid solubility limits (above a very small percentage, they precipitate out as intermetallic compounds) and because they behave as active cathodic sites that reduce water and cause the loss of magnesium.^[12] Reducing the quantity of these metals improves corrosion resistance. Sufficient manganese overcomes the corrosive effects of iron. This requires precise control over composition, increasing costs.^[12] Adding a cathodic poison captures atomic hydrogen within the structure of a metal. This prevents the formation of free hydrogen gas, which is required for corrosive chemical processes. The addition of about one-third of a percent of arsenic reduces its corrosion rate in a salt solution by a factor of nearly ten.^[12]^[13]

High-temperature creep and flammability

Research and development eliminated magnesium's tendency toward high-temperature creep by inclusion of scandium and gadolinium. Flammability was greatly reduced by introducing a small amount of calcium into the mix.^[12]

Compounds

Magnesium forms a variety of industrially and biologically important compounds, including magnesium carbonate, magnesium chloride, magnesium citrate, magnesium hydroxide (milk of magnesia), magnesium oxide, magnesium sulfate, and magnesium sulfate heptahydrate (Epsom salts).

Isotopes

Magnesium has three stable isotopes: 24
Mg, 25
Mg and 26
Mg. All are present in significant amounts (see table of isotopes above). About 79% of Mg is 24
Mg. The isotope 28
Mg is radioactive and in the 1950s to 1970s was made commercially by several nuclear power plants for use in scientific experiments. This isotope has a relatively short half-life (21 hours) and so its use was limited by shipping times.

26
Mg has found application in isotopic geology, similar to that of aluminium. 26
Mg is a radiogenic daughter product of 26
Al, which has a half-life of 717,000 years. Large enrichments of stable 26
Mg have been observed in the Ca-Al-rich inclusions of some carbonaceous chondrite meteorites. The anomalous abundance of 26
Mg is attributed to the decay of its parent 26
Al in the inclusions. Therefore, the meteorite must have formed in the solar nebula before the 26
Al had decayed. Hence, these fragments are among the oldest objects in the solar system and have preserved information about its early history.

It is conventional to plot 26
Mg/24
Mg against an Al/Mg ratio. In an isochron dating plot, the Al/Mg ratio plotted is27
Al/24
Mg. The slope of the isochron has no age significance, but indicates the initial 26
Al/27
Al ratio in the sample at the time when the systems were separated from a common reservoir.

Production

Country	2011 production (tonnes)^[14]
China	661,000
U.S.^{[note 1]}	63,500
Russia	37,000
Israel	30,000
Kazakhstan	21,000
Brazil	16,000
Ukraine	2,000
Serbia	1,500
Total	832,000

Magnesium sheets and ingots

China is the dominant supplier of magnesium, with approximately 80% of the world market share. China is almost completely reliant on the silicothermic Pidgeon process (the reduction of the oxide at high temperatures with silicon, often provided by a ferrosilicon alloy in which the iron is but a spectator in the reactions) to obtain the metal.^[15] The process can also be carried out with carbon at approx 2300 °C:

2MgO
(s) + Si
(s) + 2CaO
(s) → 2Mg
(g) + Ca
2SiO
4(s)

MgO
(s) + C
(s) → Mg
(g) + CO
(g)

In the United States, magnesium is obtained principally with the Dow process, by electrolysis of fused magnesium chloride from brine and sea water. A saline solution containing Mg2+
ions is first treated with lime (calcium oxide) and the precipitated magnesium hydroxide is collected:

Mg2+
(aq) + CaO
(s) + H
2O → Ca2+
(aq) + Mg(OH)
2(s)

The hydroxide is then converted to a partial hydrate of magnesium chloride by treating the hydroxide with hydrochloric acid and heating of the product:

Mg(OH)
2(s) + 2 HCl → MgCl
2(aq) + 2H
2O
(l)

The salt is then electrolyzed in the molten state. At the cathode, the Mg2+
ion is reduced by two electrons to magnesium metal:

Mg2+
+ 2 e− → Mg

At the anode, each pair of Cl−
ions is oxidized to chlorine gas, releasing two electrons to complete the circuit:

2 Cl−
→ Cl
2 (g) + 2 e−

A new process, solid oxide membrane technology, involves the electrolytic reduction of MgO. At the cathode, Mg2+
ion is reduced by two electrons to magnesium metal. The electrolyte is Yttria-stabilized zirconia (YSZ). The anode is a liquid metal. At the YSZ/liquid metal anode O2−
is oxidized. A layer of graphite borders the liquid metal anode, and at this interface carbon and oxygen react to form carbon monoxide. When silver is used as the liquid metal anode, there is no reductant carbon or hydrogen needed, and only oxygen gas is evolved at the anode.^[16] It has been reported that this method provides a 40% reduction in cost per pound over the electrolytic reduction method.^[17] This method is more environmentally sound than others because there is much less carbon dioxide emitted.

The United States has traditionally been the major world supplier of this metal, supplying 45% of world production even as recently as 1995. Today, the US market share is at 7%, with a single domestic producer left, US Magnesium, a Renco Group company in Utah born from now-defunct Magcorp.^[18]

History

The name magnesium originates from the Greek word for a district in Thessaly called Magnesia.^[19] It is related to magnetite and manganese, which also originated from this area, and required differentiation as separate substances. See manganese for this history.

In 1618, a farmer at Epsom in England attempted to give his cows water from a well there. The cows refused to drink because of the water's bitter taste, but the farmer noticed that the water seemed to heal scratches and rashes. The substance became known as Epsom salts and its fame spread. It was eventually recognized as hydrated magnesium sulfate, MgSO
4·7 H
2O.

The metal itself was first produced by Sir Humphry Davy in England in 1808. He used electrolysis on a mixture of magnesia and mercuric oxide.^[20] Antoine Bussy prepared it in coherent form in 1831. Davy's first suggestion for a name was magnium,^[20] but the name magnesium is now used.

Uses as a metal

An unusual application of magnesium as an illumination source while wakeskating in 1931

Magnesium is the third-most-commonly-used structural metal, following iron and aluminium. It has been called the lightest useful metal by The Periodic Table of Videos.^[21]

The main applications of magnesium are, in order: component of aluminium alloys, in die-casting (alloyed with zinc),^[22] to remove sulfur in the production of iron and steel, and the production of titanium in the Kroll process.^[23]

Historically, magnesium was one of the main aerospace construction metals and was used for German military aircraft as early as World War I and extensively for German aircraft in World War II.

The Germans coined the name "Elektron" for magnesium alloy. The term is still used today. The application of magnesium in the commercial aerospace industry was generally restricted to engine-related components, due either to perceived hazards with magnesium parts in the event of fire or to corrosion. Currently, the use of magnesium alloys in aerospace is increasing, mostly driven by the increasing importance of fuel economy and the need to reduce weight.^[24] The development and testing of new magnesium alloys continues, notably Elektron 21, which has successfully undergone extensive aerospace testing for suitability in engine and internal and airframe components.^[25] The European Community runs three R&D magnesium projects in the Aerospace priority of Six Framework Program.

Aircraft

Wright Aeronautical used a magnesium crankcase in the WWII-era Wright Duplex Cyclone aviation engine. This presented a serious problem for the earliest examples of the Boeing B-29 heavy bomber, as engine fires in flight could ignite the engine crankcases, literally "torching" the wing spar apart.^[26]^[27]

Automotive

Mg alloy motorcycle engine blocks

Mercedes-Benz used the alloy Elektron in the body of an early model Mercedes-Benz 300 SLR; these cars ran (with successes) at Le Mans, the Mille Miglia, and other world-class race events in 1955.
Porsche used magnesium alloy frames in the 917/053 that won Le Mans in 1971, and continues to use magnesium alloys for its engine blocks due to the weight advantage.
Volkswagen Group has used magnesium in its engine components for many years.^{[citation needed]}
Mitsubishi Motors also uses magnesium for its paddle shifters.
BMW used magnesium alloy engine blocks in the 2006 325i and 330i models, including an aluminium alloy insert for the cylinder walls and cooling jackets surrounded by a high-temperature magnesium alloy AJ62A.
Chevrolet used the magnesium alloy AE44 in the 2006 Corvette Z06.

Both AJ62A and AE44 are recent developments in high-temperature low-creep magnesium alloys. The general strategy for such alloys is to form intermetallic precipitates at the grain boundaries, for example by adding mischmetal or calcium.^[28] New alloy development and lower costs that make magnesium competitive with aluminium will increase the number of automotive applications.

Electronics

Because of low weight and good mechanical and electrical properties, magnesium is widely used for manufacturing of mobile phones, laptop and tablet computers, cameras, and other electronic components.

Products made of magnesium: firestarter and shavings, sharpener, magnesium ribbon

Other

Magnesium, being readily available and relatively nontoxic, has a variety of uses:

Magnesium is flammable, burning at a temperature of approximately 3,100 °C (3,370 K; 5,610 °F),^[10] and the autoignition temperature of magnesium ribbon is approximately 473 °C (746 K; 883 °F).^[29] It produces intense, bright, white light when it burns. Magnesium's high combustion temperature makes it a useful tool for starting emergency fires. Other uses include flash photography, flares, pyrotechnics, and fireworks sparklers. Magnesium is also often used to ignite thermite or other materials that require a high ignition temperature.

Magnesium firestarter (in left hand), used with a pocket knife and flint to create sparks that ignite the shavings
In the form of turnings or ribbons, to prepare Grignard reagents, which are useful in organic synthesis.
As an additive agent in conventional propellants and the production of nodular graphite in cast iron.
As a reducing agent to separate uranium and other metals from their salts.
As a sacrificial (galvanic) anode to protect boats, underground tanks, pipelines, buried structures, and water heaters.
Alloyed with zinc to produce the zinc sheet used in photoengraving plates in the printing industry, dry-cell battery walls, and roofing.^[22]
As a metal, this element's principal use is as an alloying additive to aluminium with these aluminium-magnesium alloys being used mainly for beverage cans, sports equipment such as golf clubs, fishing reels, and archery bows and arrows.
Specialty, high-grade car wheels of magnesium alloy are called "mag wheels", although the term is often more broadly misapplied to include aluminium wheels. Many car and aircraft manufacturers have made engine and body parts from magnesium.

Safety precautions

The combusting magnesium-bodied Honda RA302 at the 1968 French Grand Prix, after the crash that killed driver Jo Schlesser.

Magnesium metal and its alloys are explosive hazards; they are highly flammable in their pure form when molten or in powder or ribbon form. Burning or molten magnesium metal reacts violently with water. When working with powdered magnesium, safety glasses with welding eye protection are employed, because the bright-white light produced by burning magnesium contains ultraviolet light that can permanently damage the retinas of the eyes.^[30]

Magnesium is capable of reducing water to highly flammable hydrogen gas:^[31]

Mg (s) + 2 H
2O (l) → Mg(OH)
2 (s) + H
2 (g)

As a result, water cannot extinguish magnesium fires. The hydrogen gas produced only intensifies the fire. Dry sand is an effective smothering agent, but only on relatively level and flat surfaces.

Magnesium also reacts with carbon dioxide to form magnesium oxide and carbon:

2 Mg + CO
2 → 2 MgO + C (s)

hence, carbon dioxide fire extinguishers are also ineffective for extinguishing magnesium fires.^[32]

Burning magnesium is usually quenched by using a Class D dry chemical fire extinguisher, or by covering the fire with sand or magnesium foundry flux to remove its air source.

Uses in compounds

Magnesium compounds, primarily magnesium oxide (MgO), are used as a refractory material in furnace linings for producing iron, steel, nonferrous metals, glass, and cement. Magnesium oxide and other magnesium compounds are also used in the agricultural, chemical, and construction industries. Magnesium oxide from calcination is used as an electrical insulator in fire-resistant cables.^[33]

Magnesium reacted with an alkyl halide gives a Grignard reagent, which is a very useful tool for preparing alcohols.

Magnesium salts are frequently included in various foods, fertilizers (magnesium is a component of chlorophyll), and culture media.

Magnesium sulfite is used in the manufacture of paper (sulfite process).

Magnesium phosphate is used to fireproof wood used in construction.

Magnesium hexafluorosilicate is used in mothproofing of textiles.

In the form of turnings or ribbons, Mg is useful in purification of solvents, for example the preparation of super-dry ethanol.

Biological roles

Mechanism of action

Because of the important interaction between phosphate and magnesium ions, magnesium ions are essential to the basic nucleic acid chemistry of life, and thus are essential to all cells of all known living organisms. Over 300 enzymes require the presence of magnesium ions for their catalytic action, including all enzymes utilizing or synthesizing ATP, or those that use other nucleotides to synthesize DNA and RNA. ATP exists in cells normally as a chelate of ATP and a magnesium ion.^[34]

Dietary sources, recommended intake, and supplementation

Examples of food sources of magnesium

Spices, nuts, cereals, cocoa and vegetables are rich sources of magnesium.^[35] Green leafy vegetables such as spinach are also rich in magnesium since they contain chlorophyll.

The UK recommended daily values for magnesium is 300 mg for men and 270 mg for women.^[36] Observations of reduced dietary magnesium intake in modern Western countries compared to earlier generations may be related to food refining and modern fertilizers that contain no magnesium.^[37]

Numerous pharmaceutical preparations of magnesium, as well as magnesium dietary supplements are available. Magnesium oxide, one of the most common forms in magnesium dietary supplements because it has high magnesium content per weight, is the least bioavailable.^[38]^[39]

Metabolism

An adult has 22–26 grams of magnesium,^[40] with 60% in the skeleton, 39% intracellular (20% in skeletal muscle), and 1% extracellular.^[41] Serum levels are typically 0.7–1.0 mmol/L or 1.8–2.4 mEq/L. Serum magnesium levels may be normal even when intracellular magnesium is deficient. The mechanisms for maintaining the magnesium level in the serum are varying gastrointestinal absorption and renal excretion. Intracellular magnesium is correlated with intracellular potassium. Increased magnesium lowers calcium^[42] and can either prevent hypercalcemia or cause hypocalcemia depending on the initial level.^[42] Low and high protein intake inhibit magnesium absorption, as does the amount of phosphate, phytate, and fat in the gut. Excess dietary magnesium is excreted in feces, urine, and sweat.^[37] Magnesium status may be assessed via serum and erythrocyte magnesium concentrations coupled with urinary and fecal magnesium content, but intravenous magnesium loading tests are more accurate and practical.^[43] A retention of 20% or more of the injected amount indicates deficiency.^[44] No biomarker has been established for magnesium.^[45]

Detection in serum and plasma

Magnesium concentrations in plasma or serum may be measured to monitor for efficacy and safety in those receiving the drug therapeutically, to confirm the diagnosis in potential poisoning victims or to assist in the forensic investigation in a case of fatal overdosage. The newborn children of mothers having received parenteral magnesium sulfate during labor may exhibit toxicity with normal serum magnesium levels.^[46]

Deficiency

Magnesium deficiency (hypomagnesemia) is common: it is found in 2.5–15% of the general population.^[47] The primary cause of deficiency is decreased dietary intake: only 32% of people in the United States meet the recommended daily allowance.^[48] Other causes are increased renal or gastrointestinal loss, an increased intracellular shift, and proton-pump inhibitor antacid therapy. Most are asymptomatic, but symptoms referable to neuromuscular, cardiovascular, and metabolic dysfunction may occur.^[47] Alcoholism is often associated with magnesium deficiency. Chronically low serum magnesium levels are associated with metabolic syndrome, diabetes mellitus type 2 and hypertension.^[49]

Therapy

Intravenous magnesium is recommended by the ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death for patients with ventricular arrhythmia associated with torsades de pointes who present with long QT syndrome; and for the treatment of patients with digoxin induced arrhythmias.^[50]
Magnesium is the drug of choice in the management of pre-eclampsia and eclampsia.^[51]^[52]
Hypomagnesemia, including that caused by alcoholism, is reversible by oral or parenteral magnesium administration depending on the degree of deficiency.^[53]
There is limited evidence that magnesium supplementation may play a role in the prevention and treatment of migraine.^[54]
Oral magnesium may be therapeutic for restless leg syndrome.^[55]

Sorted by type of magnesium salt, other therapeutic applications include:

Magnesium sulfate, as the heptahydrate called Epsom salts, is used as bath salts, as a laxative, and as a highly soluble fertilizer.^[56]
Magnesium hydroxide, suspended in water, is used in milk of magnesia antacids and laxatives.
Magnesium chloride, oxide, gluconate, malate, orotate, glycinate and citrate are all used as oral magnesium supplements.
Magnesium borate, magnesium salicylate, and magnesium sulfate are used as antiseptics.
Magnesium bromide is used as a mild sedative (this action is due to the bromide, not the magnesium).
Magnesium stearate is a slightly flammable white powder with lubricating properties. In pharmaceutical technology, it is used in the manufacturing of numerous kinds of tablets to prevent the tablets from sticking to the equipment during the tablet compression process (i.e., when the tablet's substance is pressed into tablet form).
Magnesium carbonate powder is used by athletes such as gymnasts, weightlifters, and climbers to eliminate moisture and improving the grip on a gymnastic apparatus, lifting bar, and climbing rocks.
Magnesium L-threonate is used as a dietary magnesium supplement

Overdose

Overdose from dietary sources alone is unlikely because excess magnesium in the blood is promptly filtered by the kidneys.^[47] Overdose with magnesium tablets is possible in the presence of impaired renal function. There is a single case report of hypermagnesemia in a woman with normal renal function using high doses of magnesium salts for catharsis.^[57] The most common symptoms of overdose are nausea, vomiting and diarrhea; other symptoms include hypotension, confusion, slowed heart and respiratory rate, deficiencies of other minerals, coma, cardiac arrhythmia, and death from cardiac arrest.^[42]

Function in plants

Plants require magnesium to synthesize chlorophyll, essential for photosynthesis. Magnesium in the center of the porphyrin ring in chlorophyll functions in a manner similar to the iron in the center of the porphyrin ring in heme. Magnesium deficiency in plants causes late-season yellowing between leaf veins, especially in older leaves, and can be corrected by applying to the soil either Epsom salts (which is rapidly leached), or crushed dolomitic limestone.

Notes

^ Capacity. Production figures withheld to avoid disclosing company proprietary data.

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^ "Dietary Supplement Fact Sheet: Magnesium". Office of Dietary Supplements.
^ "Vitamins and minerals – Others – NHS Choices". Nhs.uk. 26 November 2012. Retrieved 19 September 2013.
^ ^a ^b Wester PO (1987). "Magnesium". Am. J. Clin. Nutr. 45 (5 Suppl): 1305–12. PMID 3578120.
^ Firoz M; Graber M (2001). "Bioavailability of US commercial magnesium preparations". Magnes Res 14 (4): 257–62. PMID 11794633.
^ Lindberg JS; Zobitz MM; Poindexter JR; Pak CY (1990). "Magnesium bioavailability from magnesium citrate and magnesium oxide". J Am Coll Nutr 9 (1): 48–55. doi:10.1080/07315724.1990.10720349. PMID 2407766.
^ Saris NE, Mervaala E, Karppanen H, Khawaja JA, Lewenstam A (April 2000). "Magnesium. An update on physiological, clinical and analytical aspects.". Clin Chim Acta 294 (1-2): 1–26. PMID 10727669.
^ "Dietary Supplement Fact Sheet:Magnesium". US National Institute of Health.
^ ^a ^b ^c "Magnesium | University of Maryland Medical Center". Umm.edu. 7 May 2013. Retrieved 19 September 2013.
^ Arnaud MJ (2008). "Update on the assessment of magnesium status". Br. J. Nutr. 99 Suppl 3: S24–36. doi:10.1017/S000711450800682X. PMID 18598586.
^ Rob PM; Dick K; Bley N; Seyfert T; Brinckmann C; Höllriegel V et al. (1999). "Can one really measure magnesium deficiency using the short-term magnesium loading test?". J. Intern. Med. 246 (4): 373–378. doi:10.1046/j.1365-2796.1999.00580.x. PMID 10583708.
^ Franz KB (2004). "A functional biological marker is needed for diagnosing magnesium deficiency". J Am Coll Nutr 23 (6): 738S–41S. doi:10.1080/07315724.2004.10719418. PMID 15637224.
^ Baselt, R. (2008). Disposition of Toxic Drugs and Chemicals in Man (8th ed.). Biomedical Publications. pp. 875–7. ISBN 0-9626523-7-7.
^ ^a ^b ^c Ayuk J., Gittoes N.J. (Mar 2014). "Contemporary view of the clinical relevance of magnesium homeostasis". Annals of Clinical Biochemistry 51 (2): 179–88. doi:10.1177/0004563213517628.
^ "Lack Energy? Maybe It's Your Magnesium Level". United States Department of Agriculture. Retrieved 18 September 2008. Last paragraph
^ Geiger H; Wanner C (2012). "Magnesium in disease" (PDF). Clin Kidney J 5 (Suppl 1): i25–i38. doi:10.1093/ndtplus/sfr165.
^ Zipes DP; Camm AJ; Borggrefe M et al. (2012). "ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death: a report of the American College of Cardiology/American Heart Association Task Force and the European Society of Cardiology Committee for Practice Guidelines (writing committee to develop Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death): developed in collaboration with the European Heart Rhythm Association and the Heart Rhythm Society" (PDF). Circulation 114 (10): e385–e484. doi:10.1161/CIRCULATIONAHA.106.178233. PMID 16935995.
^ James MF (2010). "Magnesium in obstetrics". Best Pract Res Clin Obstet Gynaecol 24 (3): 327–337. doi:10.1016/j.bpobgyn.2009.11.004. PMID 20005782.
^ Euser, A. G.; Cipolla, M. J. (2009). "Magnesium Sulfate for the Treatment of Eclampsia: A Brief Review". Stroke 40 (4): 1169–1175. doi:10.1161/STROKEAHA.108.527788. PMC 2663594. PMID 19211496. edit
^ Giannini, A. J. (1997). Drugs of Abuse (Second ed.). Los Angeles: Physicians Management Information Co. ISBN 0-87489-499-9.
^ Teigen L, Boes CJ (2014). "An evidence-based review of oral magnesium supplementation in the preventive treatment of migraine". Cephalalgia (Review). doi:10.1177/0333102414564891. PMID 25533715. There is a strong body of evidence demonstrating a relationship between magnesium status and migraine. Magnesium likely plays a role in migraine development at a biochemical level, but the role of oral magnesium supplementation in migraine prophylaxis and treatment remains to be fully elucidated. The strength of evidence supporting oral magnesium supplementation is limited at this time.
^ Trenkwalder C, Hening WA, Montagna P, Oertel WH, Allen RP, Walters AS, Costa J, Stiasny-Kolster K, Sampaio C (2008). "Treatment of restless legs syndrome: an evidence-based review and implications for clinical practice". Mov. Disord. 23 (16): 2267–302. doi:10.1002/mds.22254. PMID 18925578.
^ Gowariker, Vasant; Krishnamurthy, V.P.; Gowariker, Sudha; Dhanorkar, Manik; Paranjape, Kalyani (8 April 2009). The Fertilizer Encyclopedia. p. 224. ISBN 9780470431764.
^ Kontani M; Hara A; Ohta S; Ikeda T (2005). "Hypermagnesemia induced by massive cathartic ingestion in an elderly woman without pre-existing renal dysfunction". Intern. Med. 44 (5): 448–452. doi:10.2169/internalmedicine.44.448. PMID 15942092.

External links

Magnesium at The Periodic Table of Videos (University of Nottingham)
Chemistry in its element podcast (MP3) from the Royal Society of Chemistry's Chemistry World: Magnesium
"Magnesium – a versatile and often overlooked element: new perspectives with a focus on chronic kidney disease". Clin Kidney J 5 (Suppl 1). February 2012. ]

UpToDate Contents

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1. Chapter 3B：近位尿細管におけるナトリウム輸送能の優越性 chapter 3b primacy of sodium transport in proximal function
2. Chapter 4A：ヘンレループにおける輸送の細胞モデル chapter 4a cell model for loop of henle transport
3. Chapter 7A：細胞‐細胞外液間の水交換 chapter 7a exchange of water between the cells and ecf
4. 腫瘍崩壊症候群：予防および治療 tumor lysis syndrome prevention and treatment

English Journal

Optimization of a UDP-glucuronosyltransferase assay for trout liver S9 fractions: activity enhancement by alamethicin, a pore-forming peptide.

Ladd MA1, Fitzsimmons PN1, Nichols JW1.
Xenobiotica; the fate of foreign compounds in biological systems.Xenobiotica.2016 Mar 7:1-10. [Epub ahead of print]
1. An existing assay for UDP-glucuronosyltransferase (UGT) activity in trout liver microsomes was optimized using trout liver S9 fractions. Individual experiments were conducted to determine the time dependence of UGT activity as well as optimal levels of S9 protein, uridine 5'-diphosphoglucuronic
PMID 26947351

MicroRNA-204 suppresses epileptiform discharges through regulating TrkB-ERK1/2-CREB signaling in cultured hippocampal neurons.

Xiang L1, Ren Y2, Li X2, Zhao W3, Song Y4.
Brain research.Brain Res.2016 Mar 3. pii: S0006-8993(16)30104-4. doi: 10.1016/j.brainres.2016.02.045. [Epub ahead of print]
MicroRNAs (miRs) have been increasingly recognised as post-transcriptional regulators involved in the pathogenesis of epilepsy. Extensive evidence suggests that inhibition of tropomyosin related kinase type B (TrkB) signaling limits epileptogenesis. It has been reported that miR-204 directly targete
PMID 26947618

Synthesis of C4 and C8 Chemicals from Ethanol on MgO-Incorporated Faujasite Catalysts with Balanced Confinement Effects and Basicity.

Zhang L1, Pham TN1, Faria J2, Santhanaraj D1, Sooknoi T1, Tan Q1, Zhao Z1, Resasco DE3.
ChemSusChem.ChemSusChem.2016 Mar 3. doi: 10.1002/cssc.201501518. [Epub ahead of print]
A new type of catalyst has been designed to adjust the basicity and level of molecular confinement of KNaX faujasites by controlled incorporation of Mg through ion exchange and precipitation of extraframework MgO clusters at varying loadings. The catalytic performance of these catalysts was compared
PMID 26938793

Japanese Journal

Multi-Phonon Excitations in Fe 2p RIXS on Mg₂FeH₆

Kurita Keisuke,Sekiba Daiichiro,Harayama Isao [他]
Journal of the Physical Society of Japan 84(4), 043201-1-3, 2015-04
NAID 40020425818

Mn添加Mg₂(IV)O₄深赤色蛍光体の組成と発光特性 (電子ディスプレイ)

河北将馬,小南裕子,中西洋一郎 [他]
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(407), 1-4, 2015-01-22
NAID 40020364830

Mn添加Mg₂(Ⅳ)O₄深赤色蛍光体の組成と発光特性 (情報ディスプレイ)

河北将馬,小南裕子,中西洋一郎 [他]
映像情報メディア学会技術報告 = ITE technical report 39(2), 1-4, 2015-01
NAID 40020355151

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拡張検索	「Ca2+/Mg2+-ATPアーゼ」「Mg2+-ATPase」
関連記事	「M」「Mg」

「Ca2+/Mg2+-ATPアーゼ」

Magnesium, ₁₂Mg
	Spectral lines of magnesium
General properties
Name, symbol	magnesium, Mg
Pronunciation	/mæɡˈniːziəm/; mag-NEE-zee-əm
Appearance	shiny grey solid
Magnesium in the periodic table
	sodium ← magnesium → aluminium
Atomic number	12
Standard atomic weight (Ar)	24.305 (24.304–24.307)
Element category	alkaline earth metal
Group, block	group 2 (alkaline earth metals), s-block
Period	period 3
Electron configuration	[Ne] 3s2
per shell	2, 8, 2
Physical properties
Phase	solid
Melting point	923 K (650 °C, 1202 °F)
Boiling point	1363 K (1091 °C, 1994 °F)
Density near r.t.	1.738 g/cm3
when liquid, at m.p.	1.584 g/cm3
Heat of fusion	8.48 kJ/mol
Heat of vaporization	128 kJ/mol
Molar heat capacity	24.869 J/(mol·K)
Atomic properties
Oxidation states	+2, +1 (a strongly basic oxide)
Electronegativity	Pauling scale: 1.31
Ionization energies	1st: 737.7 kJ/mol; 2nd: 1450.7 kJ/mol; 3rd: 7732.7 kJ/mol; (more)
Atomic radius	empirical: 160 pm
Covalent radius	141±7 pm
Van der Waals radius	173 pm
Miscellanea
Crystal structure	hexagonal close-packed (hcp)
Speed of sound thin rod	4940 m/s (at r.t.) (annealed)
Thermal expansion	24.8 µm/(m·K) (at 25 °C)
Thermal conductivity	156 W/(m·K)
Electrical resistivity	43.9 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	45 GPa
Shear modulus	17 GPa
Bulk modulus	45 GPa
Poisson ratio	0.290
Mohs hardness	1–2.5
Brinell hardness	44–260 MPa
CAS Registry Number	7439-95-4
History
Naming	after Magnesia, Greece
Discovery	Joseph Black (1755)
First isolation	Humphry Davy (1808)
Most stable isotopes
	Main article: Isotopes of magnesium
	view; talk; edit; · references

　　[★]

英

-ATPase

Ca(2+)-Mg(2+)-ATPase

関: Mg2+-ATPアーゼ

「Mg2+-ATPase」

　　[★]

Mg2+-ATPアーゼ

関: Ca2+-Mg2+-ATPase

「M」

　　[★] メチオニン methionine 　　

「Mg」

　　[★] マグネシウム magnesium 　

[15] Capacity. Production figures withheld to avoid disclosing company proprietary data.

[CIAAW-1] Conventional Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights

[IUPAC-2] Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights

[3] Bernath, P. F., Black, J. H., & Brault, J. W. (1985). "The spectrum of magnesium hydride" (PDF). Astrophysical Journal 298: 375. Bibcode:1985ApJ...298..375B. doi:10.1086/163620.

[4] Housecroft, C. E.; Sharpe, A. G. (2008). Inorganic Chemistry (3rd ed.). Prentice Hall. pp. 305–306. ISBN 978-0131755536.

[5] Ash, Russell (2005). The Top 10 of Everything 2006: The Ultimate Book of Lists. Dk Pub. ISBN 0-7566-1321-3.

[Abundance-6] "Abundance and form of the most abundant elements in Earth's continental crust" (PDF). Retrieved 15 February 2008.

[7] Anthoni, J Floor (2006). "The chemical composition of seawater". seafriends.org.nz.

[8] "Magnesium in health". magnesium.com. Retrieved 10 October 2013.

[9] ttp://www.ptable.com/#Property/State

[Dreizin.2C_Edward_L..3B_Berman.2C_Charles_H._and_Vicenzi.2C_Edward_P._2000_30-10] Dreizin, Edward L.; Berman, Charles H. & Vicenzi, Edward P. (2000). "Condensed-phase modifications in magnesium particle combustion in air". Scripta Materialia 122: 30–42. doi:10.1016/S0010-2180(00)00101-2.

[DOE-11] DOE Handbook – Primer on Spontaneous Heating and Pyrophoricity. U.S. Department of Energy. December 1994. p. 20. DOE-HDBK-1081-94. Retrieved 21 December 2011.

[giz-12] Dodson, Brian (29 August 2013). "Stainless magnesium breakthrough bodes well for manufacturing industries". Gizmag.com. Retrieved 29 August 2013.

[13] Birbilis, N.; Williams, G.; Gusieva, K.; Samaniego, A.; Gibson, M. A.; McMurray, H. N. (2013). "Poisoning the corrosion of magnesium". Electrochemistry Communications 34: 295. doi:10.1016/j.elecom.2013.07.021. edit

[14] "2011 Minerals Yearbook, Magnesium" (PDF). USGS. Retrieved 26 April 2013.

[16] "Magnesium Overview". China magnesium Corporation. Retrieved 8 May 2013.

[The_Use_of_Solid-Oxide-Membrane_Technology_for_Electrometallurgy-17] Pal, Uday B.; Powell, Adam C. (2007). "The Use of Solid-Oxide-Membrane Technology for Electrometallurgy". JOM 59 (5): 44–49. Bibcode:2007JOM....59e..44P. doi:10.1007/s11837-007-0064-x.

[18] Derezinski, Steve (12 May 2011). "Solid Oxide Membrane (SOM) Electrolysis of Magnesium: Scale-Up Research and Engineering for Light-Weight Vehicles" (PDF). MOxST. Retrieved 27 May 2013.

[19] Vardi, Nathan (22 February 2007). "Man With Many Enemies". Forbes.com. Retrieved 26 June 2006.

[20] "Magnesium: historical information". webelements.com. Retrieved 9 October 2014.

[Davy1808-21] Davy, H. (1808). "Electro-chemical researches on the decomposition of the earths; with observations on the metals obtained from the alkaline earths, and on the amalgam procured from ammonia". Philosophical Transactions of the Royal Society of London 98: 333–370. Bibcode:1808RSPT...98..333D. doi:10.1098/rstl.1808.0023. JSTOR 107302.

[22] "Magnesium Video – The Periodic Table of Videos – University of Nottingham". Retrieved 23 February 2011.

[BakerM._M._Avedesian1999-23] Baker, Hugh D. R.; Avedesian, Michael (1999). Magnesium and magnesium alloys. Materials Park, OH: Materials Information Society. p. 4. ISBN 0-87170-657-1.

[24] Ketil Amundsen; Terje Kr. Aune; Per Bakke; Hans R. Eklund; Johanna Ö. Haagensen; Carlos Nicolas et al. (2002). "Magnesium". Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH. doi:10.1002/14356007.a15_559. ISBN 3527306730.

[25] Aghion, E.; Bronfin, B. (2000). "Magnesium Alloys Development towards the 21st Century". Materials Science Forum. 350–351: 19–30. doi:10.4028/www.scientific.net/MSF.350-351.19.

[26] Bronfin, B et al. (2007). "Elektron 21 specification". In Kainer, Karl. Magnesium: Proceedings of the 7th International Conference on Magnesium Alloys and Their Applications. Weinheim, Germany: Wiley. p. 23. ISBN 978-3-527-31764-6.

[27] Dorr, Robert F (15 September 2012). Mission to Tokyo: The American Airmen Who Took the War to the Heart of Japan. pp. 40–41. ISBN 9781610586634.

[28] AAHS Journal. 44–45. American Aviation Historical Society. 1999.

[29] Luo, Alan A. & Powell, Bob R. (2001). "Tensile and Compressive Creep of Magnesium-Aluminum-Calcium Based Alloys" (PDF). Materials & Processes Laboratory, General Motors Research & Development Center. Archived from the original (PDF) on 28 September 2007. Retrieved 21 August 2007.

[30] "Magnesium (Powder)". International Programme on Chemical Safety (IPCS). IPCS INCHEM. April 2000. Retrieved 21 December 2011.

[31] "Science Safety: Chapter 8". Government of Manitoba. Retrieved 21 August 2007.

[32] "Chemistry : Periodic Table : magnesium : chemical reaction data". webelements.com. Retrieved 26 June 2006.

[33] "Demo Lab: Reaction Of Magnesium Metal With Carbon Dioxide". Retrieved 26 June 2006.

[34] Linsley, Trevor (2011). "Properties of conductors and insulators". Basic Electrical Installation Work. p. 362. ISBN 978-0-08-096628-1.

[35] Romani, Andrea, M.P. (2013). "Chapter 3. Magnesium in Health and Disease". In Astrid Sigel; Helmut Sigel; Roland K. O. Sigel. Interrelations between Essential Metal Ions and Human Diseases. Metal Ions in Life Sciences 13. Springer. pp. 49–79. doi:10.1007/978-94-007-7500-8_3.

[36] "Dietary Supplement Fact Sheet: Magnesium". Office of Dietary Supplements.

[37] "Vitamins and minerals – Others – NHS Choices". Nhs.uk. 26 November 2012. Retrieved 19 September 2013.

[Wester1987-38] Wester PO (1987). "Magnesium". Am. J. Clin. Nutr. 45 (5 Suppl): 1305–12. PMID 3578120.

[Firoz2001-39] Firoz M; Graber M (2001). "Bioavailability of US commercial magnesium preparations". Magnes Res 14 (4): 257–62. PMID 11794633.

[Lindberg1990-40] Lindberg JS; Zobitz MM; Poindexter JR; Pak CY (1990). "Magnesium bioavailability from magnesium citrate and magnesium oxide". J Am Coll Nutr 9 (1): 48–55. doi:10.1080/07315724.1990.10720349. PMID 2407766.

[41] Saris NE, Mervaala E, Karppanen H, Khawaja JA, Lewenstam A (April 2000). "Magnesium. An update on physiological, clinical and analytical aspects.". Clin Chim Acta 294 (1-2): 1–26. PMID 10727669.

[42] "Dietary Supplement Fact Sheet:Magnesium". US National Institute of Health.

[ummedu-43] "Magnesium | University of Maryland Medical Center". Umm.edu. 7 May 2013. Retrieved 19 September 2013.

[44] Arnaud MJ (2008). "Update on the assessment of magnesium status". Br. J. Nutr. 99 Suppl 3: S24–36. doi:10.1017/S000711450800682X. PMID 18598586.

[45] Rob PM; Dick K; Bley N; Seyfert T; Brinckmann C; Höllriegel V et al. (1999). "Can one really measure magnesium deficiency using the short-term magnesium loading test?". J. Intern. Med. 246 (4): 373–378. doi:10.1046/j.1365-2796.1999.00580.x. PMID 10583708.

[46] Franz KB (2004). "A functional biological marker is needed for diagnosing magnesium deficiency". J Am Coll Nutr 23 (6): 738S–41S. doi:10.1080/07315724.2004.10719418. PMID 15637224.

[47] Baselt, R. (2008). Disposition of Toxic Drugs and Chemicals in Man (8th ed.). Biomedical Publications. pp. 875–7. ISBN 0-9626523-7-7.

[Ayuk-48] Ayuk J., Gittoes N.J. (Mar 2014). "Contemporary view of the clinical relevance of magnesium homeostasis". Annals of Clinical Biochemistry 51 (2): 179–88. doi:10.1177/0004563213517628.

[49] "Lack Energy? Maybe It's Your Magnesium Level". United States Department of Agriculture. Retrieved 18 September 2008. Last paragraph

[Geiger2012-50] Geiger H; Wanner C (2012). "Magnesium in disease" (PDF). Clin Kidney J 5 (Suppl 1): i25–i38. doi:10.1093/ndtplus/sfr165.

[Zipes2006-51] Zipes DP; Camm AJ; Borggrefe M et al. (2012). "ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death: a report of the American College of Cardiology/American Heart Association Task Force and the European Society of Cardiology Committee for Practice Guidelines (writing committee to develop Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death): developed in collaboration with the European Heart Rhythm Association and the Heart Rhythm Society" (PDF). Circulation 114 (10): e385–e484. doi:10.1161/CIRCULATIONAHA.106.178233. PMID 16935995.

[James2010-52] James MF (2010). "Magnesium in obstetrics". Best Pract Res Clin Obstet Gynaecol 24 (3): 327–337. doi:10.1016/j.bpobgyn.2009.11.004. PMID 20005782.

[Euser2009-53] Euser, A. G.; Cipolla, M. J. (2009). "Magnesium Sulfate for the Treatment of Eclampsia: A Brief Review". Stroke 40 (4): 1169–1175. doi:10.1161/STROKEAHA.108.527788. PMC 2663594. PMID 19211496. edit

[54] Giannini, A. J. (1997). Drugs of Abuse (Second ed.). Los Angeles: Physicians Management Information Co. ISBN 0-87489-499-9.

[migraine-55] Teigen L, Boes CJ (2014). "An evidence-based review of oral magnesium supplementation in the preventive treatment of migraine". Cephalalgia (Review). doi:10.1177/0333102414564891. PMID 25533715. There is a strong body of evidence demonstrating a relationship between magnesium status and migraine. Magnesium likely plays a role in migraine development at a biochemical level, but the role of oral magnesium supplementation in migraine prophylaxis and treatment remains to be fully elucidated. The strength of evidence supporting oral magnesium supplementation is limited at this time.

[56] Trenkwalder C, Hening WA, Montagna P, Oertel WH, Allen RP, Walters AS, Costa J, Stiasny-Kolster K, Sampaio C (2008). "Treatment of restless legs syndrome: an evidence-based review and implications for clinical practice". Mov. Disord. 23 (16): 2267–302. doi:10.1002/mds.22254. PMID 18925578.

[57] Gowariker, Vasant; Krishnamurthy, V.P.; Gowariker, Sudha; Dhanorkar, Manik; Paranjape, Kalyani (8 April 2009). The Fertilizer Encyclopedia. p. 224. ISBN 9780470431764.

[Kontani_M.2C_Hara_A.2C_Ohta_S.2C_Ikeda_T_2005_448.E2.80.93452-58] Kontani M; Hara A; Ohta S; Ikeda T (2005). "Hypermagnesemia induced by massive cathartic ingestion in an elderly woman without pre-existing renal dysfunction". Intern. Med. 44 (5): 448–452. doi:10.2169/internalmedicine.44.448. PMID 15942092.

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Mg2+