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Problem statement: In this research the researchers studied and made an analysis to the heat and mass transfer characteristics of natural convection about a vertical surface embedded in a saturated porous medium with surface temperature distribution proportional to x^λ by taking into account the diffusion-thermo (Dufour) and thermal-diffusion (Soret) effects. Approach: The governing partial differential equations were transformed into a set of coupled non-linear ordinary differential equations, which were solved numerically using the modified fourth order Runge-Kutta method along with Nachtsheim-Swigert shooting technique. Results: Numerical results were presented for the distribution of velocity, temperature and concentration profiles within the boundary layer. Conclusion: The effects of varying the parameter λ, the sustentation parameter, N, the Lewis number, Le, the Dufour number, Df and Soret number, Sc on the velocity, temperature and concentration profiles of thermally assisting flows and thermally opposing flows were examined

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Problem statement: In this research the researchers studied and made an analysis to the effects of suction/injection and chemical reaction on mass transfer characteristics over a stretching surface. The researcher studied the effects of some parameters appear on mass transfer. Approach: Transforming the system of partial differential equations to a system of ordinary differential equations and obtaining the exact analytical solution for the momentum boundary layer problem and the concentration boundary layer equation. Results: The effects of varying the suction and injection, chemical reaction parameter γ Schmidt number, Sc and concentration parameter g were determined. Conclusion: The exact analytical solution was obtained in the presence of the extra parameters, suction/ injection parameter and the chemical reaction parameter