t NJ “4 { ~~ >< --~- —G21) Ls I 5 ‘ t.) <3 ---—- ‘ iz 4 S || 2 ct e * UPTAKE ~ | | T | ; | CONTENT t, Tis oO E(t) = -\ Oey Comparing Equation 3 to Equation 2 term by term yields uc &s 7 7 AG - 2 at In our case n R_ s (t - 7) -F s,2 K, Cee) i -!1 i=l where A and ky are constants. -T dv