María E. Comba

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Polyamines have been reported as efficient antioxidantcompounds in plants. Sunflower leaf discs, treatedwith 100 µM paraquat (PQ), a well known oxidativestress inducer, showed decreased levels of putrescine(Put), spermidine (Spd) and spermine (Spm) (between33% and 80% with respect to the controls). Argininedecarboxylase (ADC) and ornithine decarboxylase(More)
The relative importance of migrating eels and suspended particulate material (biotic and abiotic) as transporters of mirex from Lake Ontario to the St. Lawrence River Estuary is evaluated in the context of a possible adverse impact on the St. Lawrence beluga population. Our estimates suggest that transport of mirex out of Lake Ontario by eels (2270 g(More)
The electron impact and the hydrogen and methane chemical ionization mass spectra of 5,6-dihydro-2-methyl-1,4-oxathin-3-carboxanilide, the sulfoxide and sulfone derived therefrom, and 2-(2-hydroxyethylthio)-acetoacetanilide enol have been determined. All four compounds show abundant molecular ions in the electron impact spectra and abundant [MH]+ ions in(More)
Electron impact mass spectra of 8 sodium alkyl and dialkyl dithiocarbamate salts are reported with the spectra of 2 dithiocarbamate zinc salts and N',N'-dimethyl-N,N-dimethylthiocarbamylsulfenamide. The investigated compounds all gave molecular ions, and generalized descriptions of their fragmentation behavior are presented.
Kovats' retention indices and temperature coefficients for some chlorinated methanonaphthalene and methanoindene pesticides and their photoproducts were determined on an OV-17 silicone liquid phase at three different temperatures. A detailed procedure for the off-line calculation of the retention indices, (see article) and I values are described. The(More)
The polychlorinated biphenyl (PCB) contamination of the biota of the St. Lawrence estuary maximum turbidity zone (MTZ) was investigated. The species analyzed consist of zooplankton (mostly Neomysis americana), larval smelt (Osmerus mordax), juvenile smelt, juvenile tomcod (Microgadus tomcod) and adult smelt, tomcod and capelin (Mallotus villosus). A(More)
Ultraviolet irradiation of cis- and trans-chlordane yielded 3 photolysis products. The expected half-caged analog of cis-chlordane was formed in high yield, and 2 minor photoproducts of trans-chlordane were observed. One of these products was a half-caged isomer. The individual photoproducts were isolated by thin layer chromatography and characterized by(More)