on rxi-pah (sampled from spring creek, pa) gc_ev gc_ev pahs in sediment extract on rxi-pah (sampled from spring creek, pa) gc_ev gc_ev cannabinoids on rxi- sil ms using hydrogen carrier gas by gc-fid gc_fs gc_fs benz[a]anthracene and chrysene in a quechers extract of mate tea separated from potential...
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in the liver as an end-product of protein catabolism and excreted in urine. also occurs normally in skin. emollient; diu retic. chemical properties the urea molecule is planar in the crystal structure, but the geometry around the nitrogens is pyramidal in the gas-phase minimum-energy structure. in solid...