When coffee beans are roasted, the plant compound, chlorogenic acid, is broken down.

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The operators of the plant are also being prosecuted over a leak of concentrated nitric acid on 11 March last year, which injured two employees.

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They are exploring plant sites for processing the ore in the United States adjacent to a chemical facility that produces hydrochloric acid.

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Last summer 11 workers at the Urbana plant were hospitalized after a truck driver failed to attach a hose correctly and they were exposed to sulfuric acid.

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By patching in a plant gene, they have created a mutant strain that can make an enzyme which converts a natural amino acid called tyrosine into one of the synthetic forms.

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