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==Radioactive tracers==
[[Radioactive tracer]]s have been used for decades to enable the detection of sometimes minute quantities of biological products and to localize and measure biological activity. The ionizing radiations emanating from radioactive tracers that have been bio-incorporated into proteins
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'''[[Methyl tert-butyl ether]]''' ('''MTBE''') is a [[gasoline additive]] used as an [[oxygenate]] (to reduce smog) and as an [[Octane rating|octane booster] (to economize the refining process). Environmental and health concerns caused by groundwater contamination resulted in ethanol replaceing it in the United States.
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