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Carbon and oxygen isotopes which are lighter and hence enrgetically favourable, so far so good. Strontium replacements, all right, that comes with the system. But enhanced levels of Magnesium? What's the point in that? It probably has a point, or it wouldn't be there... The mind wonders. So you end up in a biological field looking for evolutionary fitness or function... Maddening.
by Nomad on Fri Oct 6th, 2006 at 11:19:43 AM EST
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Maybe shell formation prefers magnesium but calcium is more abundant so it appears as though shell formation is about calcium and magnesium is the impurity?

Also note that the Alkaline Earth Metals are Berylium, Magnesium, Calcium, Strontium, Barium, Radium. Magnesium ans Calcium are actually quite similar chemically, but Magnesium is both lighter and more reactive than Calcium.


Those whom the Gods wish to destroy They first make mad. -- Euripides

by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:29:55 AM EST
[ Parent ]
Wikipedia: Magnesium
Like its lower periodic table group neighbor calcium, magnesium reacts with water at room temperature, though it reacts much more slowly than calcium.

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Too much magnesium in the [diet] may make it difficult for the body to absorb calcium.

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Both of these alloys 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.


Calcium
Uses include: as an alloying agent used in the production of aluminium, beryllium, copper, lead, and magnesium alloys.

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[Humphry Davy] worked with electrolysis throughout his life and also discovered/isolated magnesium, strontium and barium.

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Calcium carbonate is the most common and least expensive calcium supplement. It can be difficult to digest and causes gas in some people. Taking magnesium with it can help to prevent constipation.

If you were Russian you would have more respect for the power of Mendeleyev's periodic table.

Those whom the Gods wish to destroy They first make mad. -- Euripides
by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:39:01 AM EST
[ Parent ]
Well, actually, magnesium is more abundant than calcium in the ocean (by a factor of 3 by weight, of about a factor of 5 by concentration)...

Those whom the Gods wish to destroy They first make mad. -- Euripides
by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:46:49 AM EST
[ Parent ]
Maybe one of the evolutionary purposes of shell formation is eliminating calcium as an impurity?
Magnesium is an essential element in biological systems. Magnesium occurs typically as the Mg2+ ion. It is an essential mineral nutrient for life[1][2][3] and is present in every cell type in every organism.


Those whom the Gods wish to destroy They first make mad. -- Euripides
by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:53:54 AM EST
[ Parent ]

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