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Xueyao Zhang, Jie Dong, Haihua Wu, Haihan Zhang, Jianzhen Zhang, Enbo Ma
Insect cytochrome P450 monooxygenase (CYP) plays a key role in the detoxification of insecticides. In this study, four cDNA sequences of CYP6 genes were identified and characterized. Transcription levels of LmCYP6HC1 and LmCYP6HCL1 were high in first- and fourth-instar nymph stages, respectively. LmCYP6HN1 was primarily expressed in the egg to third-instar nymph stages, while LmCYP6HQ1 was predominantly expressed in the stages from fourth-instar nymph to the adult. The four CYP6 genes were predominantly distributed in the antenna, brain, fat body, integument, and hemolymph...
February 8, 2019: Chemosphere
Yinglong Su, Jiaxin Wang, Huipeng Xia, Bing Xie, Xiang Li
Landfill treatment of municipal solid waste treatment produces a large amount of leachate, which has been an important hotspot of ARGs. This study aimed to investigate the ARGs removal potential, kinetics and mechanism from leachate in aerobic and anaerobic conditions. Simulated landfill reactors showed the efficacy in reducing ARGs, and the removal efficiencies depended on ARGs types and aerobic/anaerobic conditions. The ARGs tetQ and blaCTX-M were more likely to attenuate with the log-removal efficiencies of 1...
February 8, 2019: Chemosphere
Wei Wei, Shujuan Pang, Xiaoyan Fu, Shiwen Tan, Qian Wang, Shize Wang, Dianjun Sun
Fluoride is capable of inducing immunotoxicity, but its molecular mechanisms remain elusive. This study aimed to explore the roles of Protein kinase receptor-like ER kinase (PERK) and inositol requiring enzyme 1 (IRE1) signaling pathways in excessive fluoride-induced immunotoxicity, focusing on the regulatory roles of these two pathways in cell division and apoptosis. Firstly, we assessed the changes in cell division and apoptosis in rats exposed to 0, 50, or 100 mg/L fluoride, and detected the expression of PERK and IRE1 signaling-related proteins in spleen...
February 8, 2019: Chemosphere
Xiaofeng Wen, Zhuotong Zeng, Chunyan Du, Danlian Huang, Guangming Zeng, Rong Xiao, Cui Lai, Piao Xu, Chen Zhang, Jia Wan, Liang Hu, Lingshi Yin, Chengyun Zhou, Rui Deng
Bentonite is a natural and environmentally clay mineral, and bentonite-derived mesoporous materials (BDMMs) were obtained conveniently from the alkali and acid treatment of bentonite. In the present study, BDMMs were explored for immobilization of laccase obtained from Trametes versicolor. As a result, bentonite-derived mesoporous materials-Laccase (BDMMs-Lac) was developed for the removal of tetracycline (TC). The enzyme immobilization process was carried out through physical adsorption contact (ion exchange adsorption, hydrogen bond adsorption, and Van der waals adsorption) between the BDMMs and laccase...
February 6, 2019: Chemosphere
Xianchuan Chen, Xiong Xiong, Xiaoming Jiang, Huahong Shi, Chenxi Wu
Plastic pollution has been increasingly reported in both marine environment and inland waters, but their fate is not well understood. Several studies have showed that the surface of plastic debris can be colonized by microbes, leading to the sinking of floating plastic debris in marine environment. In this work, development of biofilm on polypropylene sheet (squares with a side length of 5 and 10 mm) and their buoyancy changes were studied in a freshwater lake in four seasons. Results showed that biofilm development have different growth rate and distinct algae composition in different seasons, which are mainly related to the difference in temperature, nutrient levels, and suspend solids in lake water...
February 6, 2019: Chemosphere
C Perrino, L Tofful, S Dalla Torre, T Sargolini, S Canepari
The possibility of a relevant contribution of biomass burning for domestic heating to PM10 in the urban area of Rome was explored. The concentration of levoglucosan was determined for 31 months in Rome and in a nearby peri-urban area. During the cold season it reached several hundreds of ng/m3 at both sites, with a clear inverse relationship with air temperature. During the summer it remained well below 100 ng/m3 . Although at the peri-urban station the concentration was about 50% higher than at the urban site, the two seasonal patterns show a very good agreement (R2  = 0...
February 6, 2019: Chemosphere
Rui Zhang, Chenhao Jia, Lining Zhao, Jie Pan, Qigui Niu, Rutao Liu
A major user of carbon black is the pigment and dyes industry, where carbon black is incorporated into paints, inks, printers, and plastics. However, little is known about the mechanism underlying the toxicity of carbon black to antioxidant proteins. Carbon black can cause oxidative stress to organisms after they invade into the body. Antioxidant proteins play a key role in keeping the organism from nanoparticle-induced oxidative damage and tend to bind with nanoparticles immediately after their invading into the biological environment, so it is meaningful to elucidate the toxicity of nanoparticles on the antioxidant proteins...
February 6, 2019: Chemosphere
Yingjie Dai, Naixin Zhang, Chuanming Xing, Qingxia Cui, Qiya Sun
In recent years, with the continuous development of industry and agriculture, the content of organic pollutants in the environment has been increasing, which has caused serious pollution to the environment. Adsorption has proven to be an effective and economically viable method of removing organic contaminants. Since biochar has many advantages such as various types of raw materials, low cost, and recyclability, it can achieve the effect of turning waste into treasure when used for environmental treatment. This paper summarizes the source and production of biochar, points out its research status in the removal of organic pollutants, expounds its adsorption mechanism on organic pollutants, introduces the relevant adsorption parameters, summarizes its regeneration methods, studies its application of engineering, and finally analyses of benefits and describes the development prospects...
February 5, 2019: Chemosphere
Qimeng Li, Xiaoyun Lu, Chendong Shuang, Chengdou Qi, Guoxiang Wang, Aimin Li, Haiou Song
In this paper, a series of mono-functional and bifunctional anion exchange resins with different kinds of trialkylammonium groups were synthesized and used for adsorption of nitrate from aqueous solution. The obtained resins were systematically characterized by scanning electron microscopy, Fourier transform infrared spectrometry and pore size distribution. Adsorptive behaviors and mechanisms were investigated by batch experiments. The nitrate could be preferentially adsorbed in the presence of chloride, sulfate and humic acid by longer-chain trialkylamine modified resins...
February 4, 2019: Chemosphere
Jian Sun, Wenjing Xu, Bihai Cai, Guofu Huang, Hongguo Zhang, Yaping Zhang, Yong Yuan, Kenlin Chang, Kangxing Chen, Yenping Peng, Kufan Chen
High-concentration nitrogen removal coupled with bioelectric power generation in an algal-bacterial biocathode photo-bioelectrochemical system (PBES) was investigated. The PBES can self-sustaining operation with continuous power output under day/night cycle by alternately using photosynthetic dissolved oxygen and nitrate/nitrite as cathodic electron acceptors. The PBES generated a high maximum power of 110mw/m2 under illumination and relatively lower power of 40mw/m2 under dark. The bioelectricity generation was accompanied by high-concentration nitrogen removal in the algal-bacterial biocathode...
February 4, 2019: Chemosphere
Heloise Beatriz Quesada, Aline Takaoka Alves Baptista, Luís Fernando Cusioli, Daiana Seibert, Charleston de Oliveira Bezerra, Rosângela Bergamasco
Micropollutants, also called emerging contaminants, consist of an extensive group of synthetic and natural substances, including pharmaceuticals, personal care products, steroid hormones, and agrochemicals. Currently, the monitoring of residual pharmaceuticals in the environment has been highlighted due to the fact that many of these substances are found in wastewater treatment plants effluents and surface waters, in concentrations ranging from ng L-1 to μg L-1 . Most of these compounds are discharged into the environment continuously through domestic sewage treatment systems...
February 4, 2019: Chemosphere
Antonio Velasco, Juan Manuel Morgan-Sagastume, Armando González-Sánchez
The removal of toxic hydrogen sulfide (H2 S) from the air at pilot-scale with elemental sulfur recovery was evaluated using Fe-EDTA chelate as a single treatment at a pH of about 8.5. This was later combined with a compost biofiltration process for polishing the pre-treated air. Experiments were performed in a unique container system that allowed deploying either Fe-EDTA chelate or Fe-EDTA chelate/biofiltration treatment (hybrid system). The results showed the feasibility of H2 S removal at concentrations between 200 and 5300 ppmv (H2 S loading rates of 7-190 g m-3 h-1 ) present in fouled air...
February 4, 2019: Chemosphere
Yupeng Zhu, Xiangyang Li, Jianhui Liu, Guiqing Zhou, Yang Yu, Li Jing, Zhixiong Shi, Xianqing Zhou, Zhiwei Sun
Decabromodiphenyl ether (BDE-209), an addictive type flame retardant, is widely found in environments, and could affect the glycolipid metabolism. The present study was designed to investigate the potential mechanism of BDE-209 affecting glycolipid metabolism. Forty mice were randomly divided into four groups, and they were exposed to BDE-209 at dosages of 0, 7.5, 25 and 75 mg kg-1 ·d-1 for 28 d, respectively. The results showed that BDE-209 increased the serum levels of glucose, insulin, and triglyceride, also decreased the level of high-density lipoprotein, and damaged the structures of liver and adipose tissue in mice...
February 2, 2019: Chemosphere
Warren M Kadoya, Reyes Sierra-Alvarez, Bhumasamudram Jagadish, Stanley Wong, Leif Abrell, Eugene A Mash, Jim A Field
Explosives, pesticides, and pharmaceuticals contain toxic nitroaromatic compounds that may form even more toxic azo compounds if they encounter reducing conditions in the environment. We investigated the mechanism by which 4,4'-dimethoxyazobenzene forms in anaerobic sludge incubations of 4-nitroanisole, an analog for the insensitive munitions compound 2,4-dinitroanisole (DNAN). Because studies have reported the mechanism to involve the coupling of reduced nitroaromatic intermediates, specifically aromatic amines and nitrosoaromatics, by nucleophilic processes, we abiotically paired 10 mM 4-aminoanisole with 2 mM 4-nitrosoanisole in nitrogen-flushed microcosms...
February 2, 2019: Chemosphere
Xuesong Zhao, Yingying You, Shaobin Huang, Fangqin Cheng, Pengfei Chen, Han Li, Yongqing Zhang
As a carcinogenic byproduct in drinking water treatment, bromate has raised global concerns on environmental and health hazard, calling for effective treatments. In the current work, a novel reduced graphene oxide supported polyaniline/WO2.72 nanobelt-flower (RGO/PANI/WO2.72 ) ternary composite was prepared through a solvent volatilization method for photocatalytic reduction of bromate. The prepared sample was characterized, and the influence of aqueous pH, ions and dissolved oxygen on the bromate reduction was explored...
February 2, 2019: Chemosphere
Qun Zhao, Yingjie Li, Xiaolong Chai, Yingxue Geng, Yan Cao, Linzhen Xu, Linfeng Zhang, Jianhong Huang, Ping Ning, Senlin Tian
Understanding the interaction between pulmonary surfactant (PS) and inhalable pollutants is vital for risk assessment of respiratory health. Here, PS extracted from porcine lung (EPS) was used to investigate the interaction of PS with nano-silica particles and polycyclic aromatic hydrocarbons (PAHs). Our results demonstrated that silica significantly affected the phase behavior and foaming ability of EPS; EPS and its major components (dipalmitoyl phosphatidylcholine, DPPC; bovine serum albumin, BSA) exhibited great enhancing effect on PAHs solubility, which follows the order: EPS > DPPC > BSA, and it was positively correlated with the hydrophobicity of PAHs...
February 2, 2019: Chemosphere
Xiao Xiao, Bei-Dou Xi, Xiao-Song He, Hui Zhang, Dan Li, Xin-Yu Zhao, Xiao-Hui Zhang
The electron transfer capacities (ETC) of dissolved organic matter (DOM) are related to their hydrophobicity. However, the underlying mechanism is poorly understood. The DOM was extracted from chicken manure compost, and fractionated into four fractions based on hydrophobicity, i.e., hydrophobic acid (HOA), hydrophobic base (HOB), hydrophilic matter (HIM) and acid insoluble matter (AIM) fractions. The composition, structure and ETC of the four fractions were measured using spectral technology and electrochemical methods...
February 1, 2019: Chemosphere
Zheng-Qian Liu, Lihua You, Xuejun Xiong, Qun Wang, Yahui Yan, Jialing Tu, Yu-Hong Cui, Xue-Yan Li, Gang Wen, Xiaohui Wu
Combination of coagulation and ozonation was used to treat brine derived from a three-stage reverse osmosis (RO) process during coal gasification wastewater reclamation. Effects of operating parameters on the removals of total organic carbon (TOC), color and UV absorbance at 254 nm (A254 ) were investigated during coagulation and ozonation. All the removal efficiencies of TOC, A254 and color of FeCl3 coagulant are about twice those of AlCl3 coagulant at the same molar dose since almost all the molecular weight fractions of RO concentrate (ROC) could be removed effectively by FeCl3 coagulant while only the fractions of molecular weight > 3 k Da could be removed effectively by AlCl3 coagulant...
February 1, 2019: Chemosphere
María Zoleica Simón Solá, Nadia Lovaisa, Jose Sebastian Dávila Costa, Claudia Susana Benimeli, Marta Alejandra Polti, Analia Alvarez
The aims of this study were (1) to isolate new multi-resistant actinobacteria from soil, rhizosphere and plant samples collected from an ancient illegal pesticide storage and (2) to elucidate the effects of these microorganisms developed with maize root exudates on lindane and Cr(VI) removal. Fifty-seven phenotypically different actinobacteria were isolated and four of them, belonging to the genus Streptomyces exhibit tolerance to a mixture of lindane and Cr(VI). Two rhizospheric strains named as Streptomyces sp...
February 1, 2019: Chemosphere
Jia'nan Cui, Junyu Guo, Zihan Zhai, Jianbo Zhang
The source of trifluoroacetic acid (TFA) has long been a controversial issue. Fluoropolymer thermolysis is expected to be a potential anthropogenic source except for CFC alternatives. However, its TFA yield and contributions have rarely been reported more recently. In this study, we investigated the thermal properties of three kinds of fluoropolymers, including poly (vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP), poly (vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) and poly (tetrafluoroethylene) (PTFE)...
February 1, 2019: Chemosphere
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