Ion-electrode study of magnesium(II)-ATP and manganese(II)-ATP association.
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Biomedical subjects
Publications and source records attributed to G A Rechnitz.
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Valinomycin and glass electrodes were used to measure activity of potassium ions in equilibrium with adenosine triphosphate. The thermodynamic formation constant of the complex is approximately 25 times greater than indirect measurements predict.
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Coimmobilized glucose oxidase and anti-T4 antiserum are employed in the construction of a biosensor for thyroxine measurements. The resulting enzyme-immunosensor yields an amplified response to T4 with a detection limit of 15 nM.
A novel enzymatic ligand binding assay for biotin and its benzodiazepine conjugate is based on their binding to horseradish peroxidase-avidin conjugate (A-P) followed by the uptake of biotin-unsaturated A-P onto polystyrene beads coated with biotin-BSA. The detection limit is 1.3 x 10(-16) mol per tube (300 microL) with a 3.3 x 10(-12) M A-P solution and varies with the conjugate concentration employed. The coefficient of variation for 10 repetitive assays of 10(-15) mol of biotin is 6.22%.