Richard Zaylskie

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Four calves were fed polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans for 120 days at levels somewhat higher than what may be found in forage near some waste incinerators and manufacturing plants. Four calves were fed identical diets but without the chemicals. Using bioelectrical impedance measurements of total body fat, 30-50% of the(More)
Adipose tissue samples from 158 cattle raised locally at experiment stations across the USA were analysed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F). While 80% of the samples had PCDD/F concentrations that fell within the range of a previous US survey of beef animals (not detected -4.1 ppt toxic equivalency), several animals had(More)
To obtain information on dioxin levels in the human diet, the Food Safety and Inspection Service of the United States Department of Agriculture recently determined levels of dioxin-like compounds (dioxins/dibenzofurans/PCBs) in four major slaughter classes (steers and heifers, market hogs, young chickens, and young turkeys) that comprise over 90% of the(More)
Hydrocarbons from three homologous series of branched alkanes from the eggs of the tobacco hornworm, Manduca sexta (L.), were identified by mass spectrometry. Gas-liquid chromatography (GLC) peaks 37-A (equivalent chain length of 37.2) and 39-A (equivalent chain length of 39.2) were mixtures of 13-, 15-, 17-, and 19-methylheptatriacontane and 13-, 15-, 17-,(More)
Mass spectra of TMS derivatives of aniline glucuronide and pentachloroaniline glucuronide are presented, and the fragmentation of these derivatives is compared with that of TMS aryl-O-glucuronides. Fragmentation yielding ions entirely from the glycone moiety was sufficiently similar to establish these N-glucuronides as TMS glucuronides in the same manner(More)
Wood and other environmental samples were collected from sites that produced beef with higher than average residues of dibenzo-p-dioxin (PCDD) and dibenzofuran (PCDF). Analyses of these samples for PCDD/Fs and pentachlorophenol (PCP) indicated that the high beef residues were associated with PCP-treated wood in the animal facilities. Concentrations of(More)
The chlorocarbon mirex undergoes slow, successive loss of chlorine in the field to a series of related compounds that had lost one or more chlorine atoms. Soil samples were recovered 12 years after treatment at 1 part per million (ppm), and ant bait was recovered 5 years after an aircraft crash. As much as 50 percent of the original mirex was recovered at(More)