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Topic: A Pillar of Iron

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	Encyclopedia :: encyclopedia : Iron (Site not responding. Last check: 2007-10-24)
		Iron is notable for being the final element produced by stellar nucleosynthesis, and thus the heaviest element which does not require a supernova or similarly cataclysmic event for its formation.
		Iron is a metal extracted from iron ore, and is hardly ever found in the free (elemental) state.
		A class of non-heme iron proteins is responsible for a wide range of functions within several life forms, such as enzymes methane monooxygenase (oxidizes methane to methanol), ribonucleotide reductase (reduces ribose to deoxyribose; DNA biosynthesis), hemerythrins (oxygen transport and fixation in marine invertebrates) and purple acid phosphatase (hydrolysis of phosphate esters).
	www.hallencyclopedia.com /Iron (2715 words)

	Iron - Wikipedia, the free encyclopedia
		Iron is also the second most abundant element by mass, making up 34% of the mass of the Earth; the concentration of iron in the various layers of the Earth ranges from high at the inner core to about 5% in the outer crust.
		Iron is a metal extracted from iron ore, and is almost never found in the free elemental state.
		Iron distribution is heavily regulated in mammals, as a defense against bacterial infection and also because of the potential biological toxicity of iron.
	en.wikipedia.org /wiki/Iron (3439 words)

	Iron
		Iron is also one of the least reactive metals, and therefore, it is sometimes found pure in nature.
		Iron distribution is heavily regulated in mammals, both as a defense against bacterial infection as well as the potential biological toxicity of iron.
		Humans experience iron toxicity above 20 milligrams of iron for every kilogram of weight, and 60 milligrams per kilogram is a lethal dose.[3] Over-consumption of iron, often the result of children eating large quantitities of ferrous sulfate tablets intended for adult consumption, is the most common toxicological cause of death in children under six.
	www.brainyencyclopedia.com /encyclopedia/i/ir/iron.html (3082 words)

	Amazing Science
		The Delhi iron pillar is testimony to the high level of skill achieved by ancient Indian iron smiths in the extraction and processing of iron.
		The iron pillar at Delhi has attracted the attention of archaeologists and corrosion technologists as it has withstood corrosion for the last 1600 years.
		Iron ore was known to be greasy stone of pale red colour, or of the colour of the sinduvara flower (hematite).
	www.hinduism.co.za /amazing.htm (14227 words)

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