[Effect of 1,4-naphthoquinone aged black carbon on reactive oxygen species and DNA strand breaks in human bronchial epithelial cells].

Objective: To study the effect of 1,4-naphthoquinone aged black carbon (BC/1,4-NQ) on reactive oxygen species and DNA strand breaks in human bronchial epithelial cells (16HBE).

Methods: In the study, 16HBE cells were exposed to BC/1,4-NQ, BC and 1,4-NQ at the concentrations of BC/1,4-NQ (10.0/0.

Bacillus bingmayongensis sp. nov., isolated from the pit soil of Emperor Qin's Terra-cotta warriors in China.

A Bacillus-like isolate, strain FJAT-13831(T), isolated from the No. 1 pit soil of Emperor Qin's Terra-cotta Warriors in Xi'an City, China, was studied to determine its taxonomic status. Dominant fatty acids of this organism included iso-C15:0, iso-C17:0, C16:0, iso-C13:0, anteiso-C15:0, and iso-C17:1ω5c.

Isolation, identification and cyfluthrin-degrading potential of a novel Lysinibacillus sphaericus strain, FLQ-11-1.

Strain FLQ-11-1, isolated from sewage sludge, was able to degrade cyfluthrin and was identified as Lysinibacillus sphaericus based on its morphology, 16S rRNA sequence and fatty acid methyl ester (FAME) analyses. This strain could use cyfluthrin as its carbon or nitrogen source. Response surface methodology (RSM) analysis showed that the optimum conditions for degradation were at pH 7.

[Nitrite accumulation in ammonia-rich organic wastewater].

Nitrite accumulation in CSTR reactor for the artificial ammonia-rich organic wastewater was studied in this paper. It was focused that the effect of C/N to nitrite accumulation and NO(2-) -N : NH(4+) -N in the effluent under the condition of 35 degrees C, dissolved oxygen(DO) 1.5-2 mg/L, hydraulic retention time (HRT) 1 day and pH 8.