Abstract Culturing of Aspergillus flavus was conducted in static flask cultures and 4 in. × 5 ft columns (containing 7–8 kg corn) to measure the effects of moisture, temperature, and air flow upon growth and the production of aflatoxin. Aflatoxin levels as high as 6200 ppb (dry basis) in 10 days were observed. Conditions were selected (ca. 20% moisture, 0.008 liter air/kg corn/min air flow with 1.5 liter/kg/min recirculated) for production of aflatoxin in 1200 bushels of corn in a 18‐ft diam corrugated steel Butler storage bin for preparation of contaminated corn for animal feeding trials and for testing of an ammoniation process for decontamination of aflatoxin in corn. A target level of 1000 ppb aflatoxin was attained.
Information published in U.S.G.S. Professional Papers 445 and 478 indicated to the writer that the structure of the Coeur d9Alene District in northern Idaho were developed by slumping along a rift graben that formed during late Precambrian time while the sediments were more or less semi-consolidated. Deep synclinal folds with adjacent anticlines over-turned toward each other, minor slump features, the St. Regis Breccia resembling a quickstone breccia and abundant evidence of past hydrothermal activity all seem to support the theory of an ancient rift graben.
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