Researchers at the University of Strathclyde found that wheat bran and oat additives gave living Pleurotus ostreatus beechwood composites the highest mean peak compressive stress, at 29.77 and 31.45 kPa. Of four surface-area measures taken by nitrogen adsorption and X-ray micro-computed tomography, the surface area accessible to fungal hyphae followed the strength ranking most closely.