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Nitrite was shown to quench the fluorescence of 6-methoxy-N-(3-sulfopropyl) quinolinium (SPQ) almost twofold more than chloride. SPQ loaded inside vesicles prepared from asolectin and isolated erythrocyte ghosts allowed for the direct measurement of nitrite movement across these membranes. Movement of nitrite across asolectin occurred by diffusion as HNO2 in a pH-dependent manner. By contrast, erythrocyte...
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