Cheng-gang Gu

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OBJECTIVE To observe the effects of paeonol(Pae) on lipid peroxidational reaction and oxidational decorate of low density lipoprotein(LDL). METHOD The rat model of hyperlipidaemia was established by feeding high lipid diet with cholesterol for 6 weeks. The contents of malondialdehyde(MDA) and oxidized low density lipoprotein(OX-LDL) were measured by(More)
The rapid-desorbing fraction plays an important role in the bioavailability of organic pollutants in soil. In the present study, DDT's desorption from the cotton field soils was investigated by Tenax extraction. The results of the Tenax consecutive extraction (400 h) indicated that the rate constants were in the order of 10(-1), 10(-2), and 10(-4) h(-1) for(More)
Polybrominated diphenyl ethers (PBDEs) are experimentally indicated to be capable of binding to the cytosolic aryl hydrocarbon receptor (AhR) and show a weak or moderate toxicity. However, little is yet known about the AhR-mediated toxicology. To fully evaluate the structural effects of PBDE ligand on AhR binding affinity and toxicity, quantitative(More)
DFT-B3LYP method with 6-31G(**) basis set was employed to fully optimize the electronic structures of 135 polychlorinated dibenzofurans and parent compound, namely dibenzofuran. It was demonstrated that polarizability anisotropy and mean polarizability could change sensitively and systematically with chlorine number and substitution pattern. And new(More)
The ultraviolet (UV) photolysis of atrazine in aqueous solution was investigated at wavelength of 254 nm in this study. This paper was mainly focused on the identification of atrazine degradation intermediates by HPLC-MS/MS and its degradation mechanisms. The photodegradation products included the following seven classes: dechloro-hydroxylated products,(More)
A Gram-negative, aerobic, non-motile bacterial strain hun6T isolated from the polluted soil near a chemical factory in northern Nanjing, China was investigated to clarify its taxonomic position. Growth of strain hun6T occurred between 10 and 45 °C (optimum, 30 °C) and between pH 6.0 and 8.0 (optimum, pH 7.0). No growth occurred at NaCl concentrations(More)
The objective was to elucidate the role of extracellular polymeric substances (EPS) in biodegradation of polycyclic aromatic hydrocarbons in two-liquid-phase system (TLPs). Therefore, biodegradation of phenanthrene (PHE) was conducted in a typical TLPs—silicone oil–water—with PHE-degrading bacteria capable of producing EPS, Sphingobium sp. PHE3 and(More)
With the popular methods of CoMFA and CoMSIA, three-dimensional quantitative structure-activity relationships (QSARs) were newly developed for the toxicity of polybrominated diphenyl ethers (PBDEs). The choice of optimized geometries by density functional theory (DFT) as molecular template and the RMSD-based molecular alignment strategy might mostly(More)
Dicofol with high impurity of DDT compounds is still widely used in agricultural practice such as cotton cultivation and becomes an important source of DDT pollution in China. In this study, investigations on the DDT residues in cotton fields from northern Jiangsu province, China were conducted. The results showed that DDTs in cotton soil were much higher(More)
To enhance the removal efficiency of 2,2',4,4'-tetrabromodiphenylether (BDE47) in aqueous solutions, novel attapulgite-supported Fe/Ni bimetallic nanoparticles (A-Fe/Ni), which were characterized by a core-shell nanoparticle structure and with an average diameter of 20-40 nm, were synthesized for use in BDE47 degradation. The presence of attapulgite in(More)