No abstract

No abstract

Two ponds were treated with liquid rotenone (5% rotenone), one with 3 mg/L at 24°C and the other with 2 mg/L at 0°C (concentrations of active rotenone were 0.15 and 0.10 mg/L, respectively). Water samples were collected and analyzed by high‐performance liquid chromatography. The concentration of rotenone declined to 0.02 mg/L in 48 h in warm water and in 11 d in cold water. The half‐life of rotenone was calculated at 13.9 h in warm water and 83.9 h in cold water.

Rainbow trout, Oncorhynchus mykiss (Walbaum), eggs were exposed to [methano-''*C] malachite green chloride on day 0 and on every third day thereafter through day 24, with a final treatment administered to fry on day 31. Eggs or fry were sampled before each treatment, and at selected times from day 31 to day 59. Malachite green equivalence in eggs and fry was determined by sample oxidation and liquid scintillation counting. Total malachite green residues increased throughout the exposure period to 0-271+0-042/Ygg"' (x±SD) on day 31. Residues declined to 0-055 ± 0-011/fgg"' on day 59. The depuration phase declined monoexponentially with a half-life of 13-3 days for the absolute amount (^g sample^') and a half-life of 9-7 days for the concentration of malachite green residues (^gg~^'). Growth dilution accounted for the 25% increase in the elimination (9-7 days) of malachite green residues. Extracts from treated eggs and fry were analysed by re versed-phase liquid chromatography. Three peaks were resolved in treated eggs: chromatic malachite green, Icuco malachite green and an unknown polar metabolite. Only two peaks were resolved in the fry: leuco malachite green and the unknown polar metabolite. The most prominent residue in all samples was leueo malachite green.

Close your eyes and try to imagine a “typical” Catholic. If you’re like most people, you’ll probably picture a white priest or bishop, somewhere in the Western world—Rome, maybe. When Hollywood wants to depict the Church, that’s what the central casting office usually dials up....