Acidity quotient, apparent

In this method, in the equation for surface reaction constants, one can distinguish the part connected with the concentration of the ions in the solution and surface groups, and the part connected with electrostatic interaction. The first one, called apparent acidity quotients may be calculated from the following equation, knowing the concentrations of the relevant ion forms and surface groups. 

Figure 2. Variation of the apparent acidity quotient (pQai) of a-FeOOH as a function of surface charge and concentration of supporting electrolyte, NaCl. Lines are contours for constant electrolyte or constant surface charge. The condition a = C = 0 yields a—FeOOH/NaCl. Balistrieri and Murray (1978).

Another goal of the USDA study was to determine whether CLA enhanced energy expenditure, lipolysis, or fat oxidation in humans, similar to the effects observed in animals. Accordingly, measurements of metabolic rate and respiratory quotient were made by indirect calorimetry, and stable isotope tracers of palmitate and glycerol were used to measure the rate of appearance of free fatty acids and glycerol as well as whole body lipolysis and apparent reesterification. CLA supplementation had no effect on metabolic rate or whole-body fat oxidation rate during rest or exercise. Similarly, CLA did not change lipolytic rate, fatty acid release from adipose tissue, or apparent FFA reesterification rates under conditions of rest or exercise (33). 

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