a rapid and reproducible method is described that employs solid phase extraction (spe) using dichloromethane, followed by gas chromatograph-mass spectrometry for the determination of toxic toluene, xylene and cumene (txc) from different lake water of dhaka mega city of bangladesh. the method was applied to detect and quantify txc in water samples collected from surface and 30 cm depth of water....

essential oils are volatile mixtures of hydrocarbons with diverse functional groups. in the current study the effect of essential oils from five medicinal plants including zataria multiflora and nepeta cataria (lamiaceae), tagetes minuta and artemisia sieberi (asteraceae), and trachyspermum ammi (apiaceae) were analyzed using gc-mass spectrometry. the toxicity of these plant essential oils agai...

Prospective epidemiologic studies generally rely on 1 baseline biologic sample from participants for measurement of prediagnostic biomarkers, assuming that 1 measurement adequately represents the participant's "typical" level. The body of work assessing the reproducibility of circulating serum 25-hydroxyvitamin D (25(OH)D) levels over time focuses almost exclusively on populations of European d...

plant fatty acyl-acyl carrier protein thioesterase (fat) is a major enzyme regulating the amount and composition of fatty acids in lipids. in this study, one type of cdna, corresponding to the fatty acyl-acyl carrier protein (acyl-acp) thioesterase (fat) enzyme, was isolated from the seed of brassica napus cv. ningyou12. blast results revealed that the cdna identified highly with the fatb class...

Fluxome analysis aims at the quantitative analysis of in vivo carbon fluxes in metabolic networks, i. e. intracellular activities of enzymes and pathways. It allows investigating the effects of genetic or environmental modifications and thus precisely provides a global perspective on the integrated genetic and metabolic regulation within the intact metabolic network. The experimental and comput...