This model assumes that log serum PFOA concentrations were changing linearly over time for a few weeks before filtration for the Lubeck measurements, and for several months before filtration for the Little Hocking measurements.
The influence of the inertial effects in the acceleration of particles when the solids concentration is changing is discussed.
Furthermore, the grid makes no allowance for the rate at which blood glucose concentration is changing or the frequency with which the blood glucose concentration is being measured [ 20].
The adiabatic approximation, as discussed by St. Lawrence and Lee [ 22]. assumes that the EVS contrast concentration is changing slowly (i.e. in a quasi-steady state) relative to the rate of change of concentration in the IVS (capillaries).
It is useful to emphasize that, although the ATP concentration is changing in this experimental design, the ratio of γ-O3-ATP/γ-O4-ATP is a valid indicator of PIX at low extent of ATP hydrolysis, unless there were a kinetic isotope effect favoring hydrolysis of the γ-O3-ATP.
Making the assumptions that subjects have achieved an equilibrium between their OC intake and excretion, that they reach a new OC equilibrium faster than OC concentrations in fish are changing, and that the subjects' fish consumption is stable over time, then the decay of the body burden of OCs should be governed by the decrease in OC concentration in fish over time.
In vivo, cellular or tissue exposure to most chemicals that are ingested orally or through other portals (e.g. skin or lungs) involves dynamic processes, including absorption, biotransformation and elimination, where local concentrations of parent compound are changing over time.
Desperately needed is the on-going calculation of whether higher atmospheric concentrations of carbon dioxide are changing the chances of rainfall events, as recently witnessed, occurring.
In the patient, the blood concentrations of the antimalarial drug are changing constantly, and the parasite age distributions may differ considerably between patients.
