Problem $3$

Consider steady state transport of a peptide across a thin layer of thickness $L.$ There is also a

homogeneous reaction producing this peptide throughout the thin layer at the constant rate of $k.$

At $x=L,$ the peptide concentration is kept constant at $x_L,$ while at the other end, $x=0,$ the

peptide concentration is kept constant at $x_0.$ Develop an expression for the peptide

concentration profile.