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The oxidase test is performed using a reducing agent to detect bacteria’s ability to produce cytochrome c oxidase, an enzyme in the electron transport chain. The reducing agent (TMPD)) changes or produces a purple color as it become oxidized. Pseudomoonas aeruginosa: pruple color formed indicating the presence of cytochrome c oxidase on the oxidase strip impregnated with TMPD. Escherichia coli: no purple color formed indicating there is no cytochrome c oxidase.

Cytochrome c oxidase subunit I - Wikipedia, the free encyclopedia

Oxydase // détection de cytochrome-oxydase ; réactif tétraméthyl-P-phénylènediamine 1% = receveur artificiel d'électrons ; Bleu = positif (oxydé), Incolore = négatif (réduit)

The role of cytochrome c oxidase deficient hippocampal neurones in Alzheimer's disease

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Phylogeny of scale-worms (Aphroditiformia, Annelida), assessed from 18SrRNA, 28SrRNA, 16SrRNA, mitochondrial cytochrome c oxidase subunit I (COI), and morphology

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Cell image CIL:13729 NCBI Organism: Homo sapiens Cell Types: endothelial cell Cell Lines: HeLa,cervical carcinoma Cellular Components: mitochondrion,mitochondrial outer membrane translocase complex,mitochondrial intermembrane space Biological Process: respiratory electron transport chain,protein targeting to mitochondrion Molecular Function: electron transporter, transferring electrons from CoQH2-cytochrome c reductase complex and cytochrome c oxidase complex activity,heme…

Cytochrome C oxidase - can't live without it. I found it on @MoleculeWorld