Sapwood and heartwood groundwood samples were prepared separately from a second growth, coastal range, young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). The bleaching responses of these two groundwoods to zinc hydrosulfite were examined, and the roles of both dihydroquercetin and quercetin in this bleaching reaction were investigated. Heartwood groundwood was identified...
While the heartwood of many wood species exhibits excellent resistance to fungal and insect attack, this resistance is sometimes diminished in second-growth material of the same species. The reasons for the reduced durability are unclear, but they may reflect a combination of both higher proportions of sapwood as well as...
Because of the organic nature and the natural foaming characteristics
of kraft mill effluents, it was decided to investigate the
feasibility of using foam separation as a method of treatment. The
treatment efficiency was evaluated by BOD and COD reductions as
well as the decrease in toxicity to marine life....
