Corrections may be applied by multiplying the concentrations by certain factors called activity coefficients, the values of which can be calculated theoretically or derived from other measurements.
Since stars contain a preponderance of hydrogen and helium that are completely ionized throughout the interior, the average particle mass, μ, is the (unit) mass of a proton, divided by a factor taking into account the concentrations by weight of hydrogen, helium, and heavier ions.
Additionally, a multiple response based on the normalization of the concentrations by the highest values was built to establish a compromise condition between the two analytes.
The calibration curves for ADS-I, M1 or M2 were generated by plotting the peak area ratios of the analytes to the internal standard versus the concentrations by least-square linear regression.
In this randomised crossover study, 12 volunteers (6 males, 6 females) received a single oral dose of 1000 mg ciprofloxacin XR or 500 mg levofloxacin to assess the concentrations (by high-pressure liquid chromatography) in plasma up to 32 h and the UE at intervals up to 36 h.
When the surface coil was underloaded during the calibration session, the phantom replacement method consistently underestimated the concentrations by about 10%.
