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Impact of solids content on copper Cu relaxivity. Media used were water (U), agar (V), agar-cyanobacteria (W), 30:60 bacteria-agar (X), 50:50 bacteria-agar (Y), and the bacterial pellet (Z). Standard deviations were relatively small, indicating that, at each solids density, R remained consistent for a wide range of copper concentrations. Larger deviations in the 30:60 and 50:50 bacterium-agar media are probably due to the greater technical difficulty in the preparation of the standards.
