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Which color indicates negative result for this test

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The organisms for this lab were Alcaligenes faecalis, Escherichia coli, Bacillus subtilis, and Pseudomonas aeruginosa.

1) A nitrate broth had no color change after the addition of nitrate reagents A and B. Zinc dust was added to the sample. Does zinc dust test for the reduction of nitrate to nitrite or nitrate to nitrogen gas? Which color indicates a negative result for this test?

Reference no: EM133518798

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