For this paper we measured the flux of five substances through the skin of frog and pig ear.
We have so far shown that: a) the flux of each substance was always much higher in frog than in pig ear skin (Figure 2); b) in particular the ratio Patrazine/Pglyphosate was 134 in frog and 12 in pig; c) the line interpolating the frog data is steeper than the other (Figure 3A).
A good tracer does not hamper the flux of the substance, therefore one can assume that the flux of the tracer within a certain reaction is proportional to the flux of the original species.
Transport mechanism of the substance after the application of electric field can be explained by following (4) [ 10]: (4) J L = J p + J er + J eo, where JL is the mole flux of the substance L, J p is the passive flux, Jer represents electrorepulsive contribution, and Jeo depicts the electroosmotic flux.
Reliable quantitative prediction of water movement and fluxes of dissolved substances – specifically organic carbon – at both the hillslope and the catchment scales remains a challenge due to complex boundary conditions and soil spatial heterogeneity.
Mathematical and computational models of real biological phenomena, such as interactions of proteins in regulatory networks (see, for example, ref. 14) or fluxes of organic substances in well-characterized metabolic pathways (reviewed in ref. 15), are becoming more and more successful.
In this chapter, focus has been placed on tracer experiment design strategies needed to quantitate production and utilisation fluxes of a substance under both steady- and nonsteady-state conditions.
A number of representations of the world in terms of a few simple constituents that were considered fundamental emerged: Parmenides' static substance, Heraclitus' flux of becoming, Empedocles' four elements, Democritus' atoms, or Pythagoras' numbers, Plato's forms, and Aristotle's categories.
The main unifying feature of natural and artificial ecosystems is their biotic turnover (cycling) of substances which is induced with energy fluxes.
