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Tellurium - A catalyst for petroleum cracking. 1994 The Concise Columbia Electronic Encyclopedia http://www.encyclopedia.com/articles/12707.html Cracking - a chemical process by which a compound, usually organic, is broken down into simplier compounds. Cracking is accomplished either by thermal cracking or by a catalytic cracking ( a combination of heat and a catalytic agent). Cracking has become important in the petroleum refining industry as a means of increasing the production of gasoline. More than half the gasoline produced in the United States today is produced by cracking. 1997 - 1999 The Concise Columbia Electronic Encyclopedia http://encarta.msn.com/index/conciseindex/53/0532F000.htm?z=1&pg=2&br=1 Parkinsons Disease: Manganese Toxicity prevents iron from reaching ferrochelatase and causes Parkinsons Disease: MPTP prevents iron from ferrochelatase reaching porphyrin and causes Parkinsons Disease: Ferrochelatase has a Reiske cluster from mitochondrial respiration [2Fe-2S]: (NADH-UBIQUINONE-REISKE = Complex I,II,III) Tellurium is a sulphate and can substitute for sulphur and binds metals, can be both toxic and mutagenic. Tellurium inhibits ferrochelatase. [log in to unmask]