Photoproducts and metabolites of a common insect growth regulator produce devlopmental deformities in Xenopus

Article Abstract:

The degradation intermediates of the insect growth regulator S-methoprene were shown to produce developmental defects in Xenopus laevis embryos, even as the embryos were exposed to only trace amounts of the intermediates. The intermediates were formed from the degration of S-methoprene as it interacts with sunlight, water or microbial degradation. The developmental defects in the Xenopus embyos were similar to the defects found in juveniles in the wild.

Research, Biodegradation, Xenopus

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Ranking pesticides by environmental impact

Article Abstract:

Researchers from the University of California and Cornell University have developed two new mathematical models for determining the most hazardous agricultural pesticides. Both models rate pesticides by collating data on human health, ecosystem impact, and ground water and soil contamination. Although both models are not designed to make a formal quantitative risk assessment, they are effective in ranking the relative hazard posed by pesticides.

Models, Health risk assessment

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Concentrations and enantiomeric ratios of organochlorine pesticides in soils from the US corn belt

Article Abstract:

Evidence of enantioselective degradation of organochlorines in 30 soils from the US Corn Belt area was found. Quantitative analysis was carried out by gas chromatography with electron capture detection using a DB-5 column. Enantioselective analysis was also done by gas chromatography and mass spectrometry with chiral-phase capillary columns. Eleven compounds were analyzed to determine the level of concentrations for each compound.

Corn, Corn Farming, Analysis, Soils, Soil analysis, Organochlorine compounds, Organic chlorine compounds

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