Effect of acidity function on the production of bio-methane in pure and mixed samples:
After a powdered physical treatment practice, samples were treated under different operating conditions of temperature (mesophilic and thermophilic), bacteria seeding cultures (methanococcus bornchii and methanobacterium formicum), acidity functions between (3-10) pH, respectively.
They proposed the acidity function [H.sub.o] defined by the equation
 These include disulfuric acid [H.sub.2.S.sub.2.O.sub.7], and flurosulfuric acid, [HSO.sub.3.F] [H.sub.2.S.sub.2.O.sub.7] + [H.sub.2.SO.sub.4] [right arrow] [H.sub.3.SO.sup.+.sub.4] + [HS.sub.2.O.sup.-.sub.7] [HSO.sub.3.F] + [H.sub.2.SO.sub.4] [right arrow] [H.sub.3.SO.sup.+.sub.4] + [SO.sub.3.F.sup.-] Gillespie and Peel  extended Hammett and Deyrup's acidity function measurements into these completely nonaqueous and still more highly acidic solutions.
His publications dealt with topics in the fields of alkaloids, terpenes, steroids, amino-acids and peptides, carbohydrates, heterocyclic compounds, stereochemistry, conformational analysis, molecular volumes, ion mobilities, paper electrophoresis, dipole moments, electrostatic effects, acidity functions
, acid-catalyzed reactions, solvent effects, and graph theory.