Blood levels of dioxins, furans, dioxin-like PCBs, and TEQs in general populations: a review, 1989-2010.

The tropical hardwood sawdust of Tectona grandis L.f. from the wood processing industry was extracted and tested for anti-wood rot activity. Tectona grandis extract inhibited the brown rot fungi Gloeophyllum sepiarium, Gloeophyllum trabeum, Piptoporus betulinus and Serpula lacrymans, and the white rot fungi Bjerkandera adusta, Merulius tremellosus, and Phlebia brevispora. Centrifugal partition chromatography was used to separate these compounds using n-hexane-MeOH-H2O (50:47.5:2.5) as a solvent system. The compounds deoxylapachol, tectoquinone, 2-hydroxymethylanthraquinone, 3′-OH-deoxyisolapachol (2-[(1E)-3-hydroxy-3-methylbut-1-enyl]naphthoquinone), hemitectol (2,2-dimethyl-2H-benzo[h]chromen-6-ol), and tectol were isolated from Tectona grandis sawdust CHCl3-MeOH (1:1) extract. Deoxylapachol inhibited the brown rot fungi Gloeophyllum sepiarium CBS 353.74 and Gloeophyllum trabeum CBS 318.50 and the white rot fungi Merulius tremellosus CBS 280.73 and Phlebia brevispora CBS 509.92. Hemitectol toget...

Identification of Anti-Wood Rot Compounds in Teak (Tectona grandis L.f.) Sawdust Extract

Benzo(a)pyrene (BaP) is known to be carcinogenic and teratogenic. Several epidemiological and animal studies report that BaP causes neurological abnormalities; however, the mechanism of BaP-induced impairment of nervous system development and function, particularly in fish, remains unclear. In this study, Sebastiscus marmoratus embryos were exposed to BaP at environmental levels (0.5, 5 and 25 nmol/L) for 7 days. The results show disruption of the cranial innervation pattern. The expression of calmodulin (CaM) and Ca(2+)/calmodulin dependent kinase II (CaMKII) was decreased in a dose-dependent manner. BaP exposure reduced the levels of ACh and ChAT and promoted the activity of AChE. In addition, BaP exposure decreased NO concentration in all treatments and increased the activity of NOS in the 0.5 and 5 nmol/L groups. These results suggest that BaP could decrease the expression CaM and CaMKII mRNA and NO, which would perturb the cholinergic system and disrupt nervous system development.

Embryonic exposure to benzo(a)pyrene influences neural development and function in rockfish (Sebastiscus marmoratus)

Soil mutagenicity as a strategy to evaluate environmental and health risks in a contaminated area.

Determinants of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in house dust samples from four areas of the United States.

Residential and biological exposure assessment of chemicals from a wood treatment plant.

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Residential and biological exposure assessment of chemicals from a wood treatment plant.