Douglas-fir bark, 3/4 inch and 1 1/2 inch in size, was tested in recirculating trickling filters 1, 2, and 3 feet in depth, hydraulically loaded at 2.27, 4.54, and 9.08 gallons per minute per square foot (gpm/sq.ft.) with 2 and 4 percent poultry manure slurry at 70° F. Preliminary tests...
Published October 1970. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published December 1949. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published November 1966. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
One hundred and fifty-one weanling rats of both sexes were fed
control diets or diets containing 160 ppm diethylnitrosamine (DEN) or
150 ppm N-2-fluorenyl-acetamide (FAA). The carcinogen level was
calculated so that the LD₅₀ should be achieved at about 17 weeks.
Each carcinogen treatment was incorporated with three different diet...