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Any of a series of synthetic compounds related to the weedkiller paraquat, used as redox indicators. They contain heteroaromatic cations of the general formula (C₅H₄NR)₂²⁺.
- ‘The intermolecular interactions between the viologens and the macrocyclic molecule were investigated in a solution before photoirradiation.’
- ‘Methyl viologen also affects electron-transducing reactions in the endoplasmic reticulum and in mitochondria.’
- ‘The transgenic plants were also more tolerant to the oxidative damage caused by methyl viologen showing less chlorosis and less electrolyte leakage than the controls.’
- ‘The shift from a more sigmoidal plot of the binding isotherm in the case of ethidium toward a more hyperbolic plot in the case of methyl viologen demonstrates stronger versus weaker binding, respectively.’
- ‘Leaves from the transformed maize plants showed enhanced tolerance to the oxidative stress induced by incubation of leaf discs in the pro-oxidant herbicide, methyl viologen.’
1930s: from violet (because of the purple colour when electrochemically reduced) + -gen.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.