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Journal of environmental Sciences 2018年第3期30卷 356-366页

作者： Limei Xu Chongmiao Zhang Pengcheng Xu Xiaochang C.Wang International Science and Technology Cooperation center for Urban Alternative Water Resources Development China Key Laboratory of Northwest Water Resource Environment and Ecology MOE China engineering Technology research center for Wastewater Treatment and Reuse Shaanxi Province China School of environmental and Municipal engineering Xi'an University of Architecture and Technology Xi'an 710055 China

Traditional culture methods may underestimate the tolerance of microorganisms to disinfectants because of the existence of viable but nonculturable or sublethally injured cells after *** selection of a strict method is crucial for the evaluation of disinfection *** actions of 2 typical disinfectants–ultraviolet（UV）and chlorine–on the fecal indicator Escherichia coli were investigated by the detection of culturability,membrane permeability,metabolic activity,deoxyribonucleic acid（DNA）,and messenger ribonucleic acid（m RNA）.During UV disinfection,the irreversible damages in the cell membrane and cellular adenosine triphosphate（ATP）were negligible at low UV doses（80 m J/cm^2）.However,membrane permeability was damaged at low doses of chlorine（5 mg/L）,leading to leakage of cellular *** study showed that a slight lesion in DNA was detected even at high doses of UV（400 m J/cm^2）and chlorine（5 mg/L）*** decay of m RNA was more rapid than that of *** degradation level of m RNA depended on the choice of target *** exposure to 50 m J/cm^2UV dose or 5 mg/L chlorine for30 min,the DNA damage repair function（Rec A m RNA）was *** m RNA involved in the DNA damage repair function can be a potential indicator of bacterial viability.

关键词： UV Chlorination Membrane damage Adenosine triphosphate DNA mRNA

Regulation of vegetation pattern on the hydrodynamic processes of erosion on hillslope in Loess Plateau,China

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Journal of groundwater Science and engineering 2023年第1期11卷 4-19页

作者： Guo-Qiang Yu Qian Wang Li-Feng Zhu Xia Zhang Key Laboratory of groundwater and ecology in Arid and Semi-arid Areas Xi’an Center of Geological SurveyChina Geological SurveyXi’an 710054China shaanxi province engineering research Centre of Water Resources and environment Xi’an 710054China State Key Laboratory of eco-hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China

As vegetation are closely related to soil erosion,hydrodynamic parameter changes under various vegetation pattern conditions can be used as an important basis for the research of the soil erosion *** upstream water inflow experiments conducted on a loess hillslope,how the vegetation pattern influences the hydrodynamic processes of sediment transport was *** results show that the placement of a grass strip on the lower upslope can effectively reduce runoff erosion by 69%,relying on the efficiency of regulated hydrodynamic *** effective location of grass strip for hillslope alleviating erosion is on the lower part of the upslope,mainly due to the grass strip measure used to regulate the hydrodynamic *** a result,the underlying surface runoff resistance is increased by 5 times,runoff shear stress is decreased by more than 90%,and runoff power decreased by over 92%.The measure greatly separates the scouring energy of surface runoff that acts on the slope ***,the use of grass strips effectively decreases the energy of runoff flowing along the slope,eliminating soil erosion to a great extent and thereby achieving a better regulation of hydrodynamic processe.

关键词： Soil erosion Grass strip Scouring experiment Sediment transport Regulating mechanism Loess Plateau

Tuning the fill percentage in the hydrothermal synthesis process to increase catalyst performance for ozone decomposition

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Journal of environmental Sciences 2020年第1期32卷 60-70页

作者： Li Yang Jinzhu Ma Xiaotong Li Guangzhi He Changbin Zhang Hong He State Key Joint Laboratory of environment Simulation and Pollution Control Research Center for Eco-Enuironmental SciencesChinese Academy of SciencesBeijing 100085China engineering&Technology research center for environmental Protection Materials and Equipment of Jiangxi province Pingxiang UniversityPingxiang 337055China center for Excellence in Regional Atmospheric environment Key Laboratory of Urban Pollutant ConversionInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

The performance of Ce-OMS-2 catalysts was improved by tuning the fill percentage in the hydrothermal synthesis process to increase the oxygen vacancy *** Ce-OMS-2 samples were prepared with different fill percentages by means of a hydrothermal approach(i.e.80%,70%,50%and 30%).Ce-OMS-2 with 80%fill percentage(Ce-OMS-2-80%)showed ozone conversion of 97%,and a lifetime experiment carried out for more than20 days showed that the activity of the catalyst still remained satisfactorily high(91%).For Ce-OMS-2-80%,Mn ions in the framework as well as K ions in the tunnel sites were replaced by Ce^4+,while for the others only Mn ions were replaced.O2-TPD and H2-TPR measurements proved that the Ce-OMS-2-80%catalyst possessed the greatest number of mobile surface oxygen *** and XAFS showed that increasing the fill percentage can reduce the AOS of Mn and augment the amount of oxygen *** active sites,which accelerate the elimination of O3,can be enriched by increasing the oxygen *** findings indicate that increasing ozone removal can be achieved by tuning the fill percentage in the hydrothermal synthesis process.

关键词： Manganese dioxide Ozone decomposition Fill percentage Oxygen vacancy Hydrothermal approach

Three-in-one to enhance visible-light driven photocatalytic activity of BiOCl: Synergistic effect of mesocrystalline stacking superstructure, porous nanosheet and oxygen vacancy

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Journal of Materiomics 2021年第2期7卷 328-338页

作者： Xianzi Li Shaodong Sun Xin Zhang Xiaochuan Zhang Jie Cui Qing Yang Shuhua Liang engineering research center of Conducting Materials and Composite Technology Ministry of EducationShaanxi Engineering Research Center of MetalBased Heterogeneous Materials and Advanced Manufacturing TechnologyShaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an710048ShaanxiChina

Simultaneously integrating mesocrystalline stacking superstructures,porous nanosheets and defective oxygen vacancies(OVs)into BiOCl crystals is an available strategy to enhance the visible-light-driven photocatalytic ***,we report a facile etching agent-assisted hydrothermal approach to achieve one-pot fabrication of mesocrystalline BiOCl porous nanosheet stacking superstructures with defective OVs,which show high catalytic activities towards to the visible-light-driven degradation of organic *** formation of stacking superstructure in a mesocrystalline BiOCl is responsibility for increasing the transport of charge *** results and theoretical calculations suggest that the presence of OVs is beneficial to tuning the energy band structure for the improvement of visible light harvesting,prolonging the lifetime and enhancing the oxidation activity of photogenerated charge ***,the porous morphology and thin nanosheet building block could supply abundant active sites for *** research might arouse in-depth investigations on the development of novel precursor-modified strategy for the synthesis of high-active BiOX(X¼Cl,Br and I)-based photocatalysts.

关键词： BiOCl Porous nanosheet Stacking superstructure Oxygen vacancy Photocatalysis

Influence of litter decomposition on iron and manganese in the sediments of wetlands for acid mine drainage treatments

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Acta Geochimica 2019年第1期38卷 68-77页

作者： Xiuyue Xu Yonggui Wu Yiling Rao Tianling Fu Xingyu Wu College of Resources and environmental engineering Guizhou University Karst eco-environmental engineering research center of Guizhou province Institute of Applied ecology Guizhou University Institute of New Rural Development Guizhou University

Plant litter will influence the bioavailability of heavy metals in sediments of wetlands used to treat acid mine drainage. To investigate the effect of plant litter on sediments in wetlands and define the comprehensive and continuous role of plant litter, different mass ratios(0%,5%, 20%) of litter were added into the sediments to study the influence of litter decomposition on the overlying water and sediments. The changes in pH, EC, Eh, Fe, and Mn of the overlying water and the organic matter in the sediments and the forms of Fe and Mn after 1, 7, 14, 21, and 28 days of litter decomposition were studied. The results indicated that litter decomposition increased the pH, EC, and reduced Eh of the overlying water. Litter decomposition promoted the release of Fe and Mn from the sediments into the overlying water and with the continuous decomposition of litter, the concentration of Fe and Mn in the overlying water declined. Litter decomposition increased the content of the organic matter in the sediment, and the forms of Fe and Mn indicated that litter decomposition could significantly affect the transformation of the forms of Fe and *** Fe was the main form in the sediments. Litter decomposition promoted the transformation of reducible Fe, the main form found in the sediments, intoexchangeable and oxidizable Fe, but had no effect on residual form. Exchangeable Mn was the main form in the sediments, and litter decomposition accelerated the transformation of reducible Mn, most commonly found in the sediments, into oxidizable Mn and had little influence on the exchangeable and residual forms.

关键词： AMD Sediments Litter decomposition Forms of Fe and Mn

Dietary folic acid addition reduces abdominal fat deposition mediated by alterations in gut microbiota and SCFA production in broilers

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Animal Nutrition 2023年第1期12卷 54-62页

作者： Yanli Liu Jiantao Yang Xiaoying Liu Rui Liu Yibin Wang Xinhuo Huang Yingge Li Ruifang Liu Xiaojun Yang College of Animal Science and Technology Northwest A&F UniversityYangling 712100China Nano Vitamin engineering research center of shaanxi province Xi'an 710000China shaanxi province Animal Husbandry Technology Extension Station Xi'an 710016China

Intensive selective breeding for high growth rate and body weight cause excess abdominal fat in *** microbiota and folic acid were reported to regulate lipid metabolism.A total of 210 one-day-old broilers were divided into the control(folic acid at 1.3 mg/kg)and folic acid groups(folic acid at 13 mg/kg)to illustrate the effects of folic acid on growth performance,abdominal fat deposition,and gut microbiota,and the experiment lasted 28 *** revealed that dietary folic acid addition decreased abdominal fat percentage(P<0.05)and down-regulated genes expression related to cell proliferation and differentiation in abdominal fat including IGF1,EGF,C/EBPα,PPARγ,PLIN1,FABP4 and PCNA(P<0.05).Folic acid addition decreased caecal Firmicutes-to-Bacteroidetes ratio(P<0.01)and increased the proportions of Alistipes,Oscillospira,Ruminococcus,Clostridium,Dehalobacterium and Parabacteroides(P<0.05).Caecal acetic acid,and propionic acid contents were found to be higher under folic acid treatment(P<0.05),which were negatively related to genes expression associated with adipocyte proliferation and differentiation(P<0.05).Ruminococcus was positively correlated with caecal acetic acid content,and the same phenomenon was detected between propionic acid and Oscillospira and Ruminococcus(P<0.05).Acetic acid and Oscillospira were identified to be negatively associated with abdominal fat percentage(P<0.05).In conclusion,our data demonstrated that dietary supplementation of folic acid reduced fat deposition in broilers by inhibiting abdominal adipocyte proliferation and differentiation,which might be mediated by changes in gut microbiota and short chain fatty acid production.

关键词： Folic acid Caecal microbiota Abdominal adipocytes Short chain fatty acid Broilers

Effects of nitrogen dioxide and its acid mist on reactive oxygen species production and antioxidant enzyme activity in Arabidopsis plants

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Journal of environmental Sciences 2015年第8期27卷 93-99页

作者： Xiaofang Liu Fen Hou Guangke Li Nan Sang College of environment and Resource Research Center of Environment and Health Shanxi University College of environmental Science and engineering Nankai University

Nitrogen dioxide（NO2） is one of the most common and harmful air pollutants. To analyze the response of plants to NO2 stress, we investigated the morphological change, reactive oxygen species（ROS） production and antioxidant enzyme activity in Arabidopsis thaliana（Col-0） exposed to 1.7, 4, 8.5, and 18.8 mg/m3NO2. The results indicate that NO2 exposure affected plant growth and chlorophyll（Chl） content, and increased oxygen free radical（O2-）production rate in Arabidopsis shoots. Furthermore, NO2 elevated the levels of lipid peroxidation and protein oxidation, accompanied by the induction of antioxidant enzyme activities and change of ascorbate（As A） and glutathione（GSH） contents. Following this, we mimicked nitric acid mist under experimental conditions, and confirmed the antioxidant mechanism of the plant to the stress. Our results imply that NO2 and its acid mist caused pollution risk to plant systems. During the process, increased ROS acted as a signal to induce a defense response, and antioxidant status played an important role in plant protection against NO2/nitric acid mist-caused oxidative damage.

关键词： Nitrogen dioxide Nitric acid mist Arabidopsis thaliana Reactive oxygen species Antioxidant system

Impact of cigarette smoking on recurrence of hyperlipidemic acute pancreatitis

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World Journal of Gastroenterology 2017年第47期23卷 8387-8394页

作者： Jun-Xi Xiang Liang-Shuo Hu Peng Liu Bo-Yan Tian Qing Su Yi-Chun Ji Xu-Feng Zhang Xue-Min Liu Zheng Wu Yi Lv Department of Hepatobiliary Surgery First Affiliated Hospital of Xi'an Jiaotong University Regenerative Medicine and Surgery engineering research center of shaanxi province

AIM To investigate the impact of cigarette smoking on the recurrence rate and recurrence-free survival in patients with hyperlipidemic acute pancreatitis(HLAP).METHODS A total of 863 patients were admitted to our hospital for acute pancreatitis(AP) from January 2013 to March2016, of whom 88 diagnosed with HLAP were enrolled in this retrospective study. Demographic data, medical history, previous episodes of pancreatitis, consumption of alcohol and cigarettes, as well as biochemical and hematological data were carefully recorded for univariate and multivariate analyses. During followup, the information on current smoking status and recurrent AP was gathered. Recurrence-free survival(RFS) was calculated using the Kaplan-Meier method, and the differences between groups were compared using the log-rank *** No significant differences were observed between the three groups in age or medical history of hyperlipidemia, fatty liver, diabetes mellitus, hypertension, or AP. The current smokers had a remarkably higher recurrence rate and a greater incidence of repeated episodes of AP(50.0% and 77.8%, respectively) than non-smokers(9.8% and 39.0%), and these two percentages were reduced to 9.1% and 36.4% for patients who gave up smoking. The median follow-up time was 13.5 mo and HLAP recurred after hospital discharge in 23(26.1%) patients. Multivariate analysis identified current smoking(HR = 6.3, P = 0.020) as an independent risk factor contributing to HLAP recurrence. Current smokers had significantly worse RFS than non-smokers(23 mo vs 42 mo), but no significant difference was documented between ex-smokers(34 mo) and non-smokers. The RFS was not significantly different between light and heavy *** Smoking is associated with worse RFS and an increased rate of HLAP recurrence. Continued smoking correlates with a compromised survival and smoking cessation should be recommended.

关键词： Acute pancreatitis Hyperlipemia Smoking Recurrence Epidemiology

Effects of plasticizer on removal of antibiotics and antibiotic resistance genes from agricultural soils via soil microbial fuel cells

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Pedosphere 2024年第6期34卷 981-992页

作者： Huixiang WANG Xiaoshuai SHEN Chen ZHANG Yi SHAO Hua LI Jian WU Yuli YANG Hailiang SONG School of environment Nanjing Normal UniversityJiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology Jiangsu Engineering Lab of Water and Soil Eco-remediation Jiangsu Academy of environmental Industry and Technology Corp. College of Urban Construction Nanjing Tech University

Soil microbial fuel cells（MFCs）, a novel ecosystem technology, have recently been intensively studied for antibiotic-polluted soils. However, actual agricultural soils are always contaminated by mixed pollutants, especially plasticizers from extensively used agricultural plastic films. The aim of this study was to investigate the effects of di-2-ethylhexyl phthalate（DEHP）, a representative plasticizer in soil, on the removal of sulfadiazine（SDZ）, a frequently detected antibiotic in natural environments, and antibiotic resistance genes（ARGs） and microbial community in soil MFCs. Soil MFCs maintained a good antibiotic removal ability even under the influence of residual DEHP and achieved a higher removal performance at higher DEHP concentrations due to enhanced power generation. Specifically, a higher DEHP concentration had a favorable effect on antibiotic removal in soil MFCs, with the SDZ concentration decreased in both the upper and lower layers(from 4.867 ± 0.221 to 0.268 ± 0.021 and 0.293 ± 0.047 mg kg-1, respectively) of polluted soils. Moreover, a high DEHP concentration significantly promoted the abundance of bacteria associated with electricity generation compared with a lower DEHP concentration,resulting in the promotion of extracellular electron transfer and enhancing SDZ degradation. The increased ARG abundance may be caused by the enrichment of ARG potential hosts brought about by high DEHP concentration, likely due to the increased conjugative transfer frequencies of plasmid RP4 by decreasing cell membrane permeability and increasing reactive oxygen species content. The results revealed the ecological risk of residual DEHP in soil that promotes ARG transmission in soil MFCs, although it has the potential to reduce SDZ toxicity through horizontal gene transfer. We also highlight concerns regarding the management of antibiotics and plasticizers in soil. The negative effects of plasticizers on antibiotic removal should be carefully evaluated when using soil

关键词： antibiotic removal biodegradation conjugative transfer horizontal gene transfer mixed pollutants plastic film

Mechanism insight into the enhanced photocatalytic purification of antibiotic through encapsulated architectures coupling of crystalline Cu_(2)O/amorphous TiFe layer double hydroxide

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Journal of Materials Science & Technology 2023年第36期167卷 161-170页

作者： Lin Ye Shaodong Sun Xiaoli Yang Xiaoxi Chen Bian Yang Daqin Yun Xiaojing Yu Man Yang Qing Yang Shuhua Liang Jie Cui engineering research center of Conducting Materials and Composite Technology Ministry of EducationShaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing TechnologyShaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048China College of Energy Xiamen UniversityXiamen 361005China

Amorphous materials are one of the important candidates for improving heterogeneous photocata-lysts because of their unique electronic structures and abundant catalytic sites originating from dis-order atomic ***,there is still much room for the development of new crys-talline/amorphous heterogeneous composites for photocatalytic *** efficient synthetic strategies for preparing new crystalline/amorphous heterojunctions are highly ***,we have realized the deep optimization of photocatalytic activity by fabricating crystalline/amorphous Cu_(2)O/Ti-Fe layer double hydroxide(LDH)*** to the typical Z-scheme mechanism originating from the crystalline/amorphous interfaces,the photocharge separation and catalytic active sites obviously enhance compared to single Cu_(2)O and LDH *** expected,the photocatalytic removal of tetra-cycline(TC)of the as-prepared Cu_(2)O/Ti-Fe LDH was over 5.2 and 2.2 times those of the pristine Cu_(2)O nanospheres and Ti-Fe LDH *** work illustrates the origin of crystalline Cu_(2)O nanospheres encapsulated in amorphous Ti-Fe layer double hydroxide nanosheets for enhanced photocatalytic activity driven by visible light,and provide a general Cu_(2)O-templated solution-phase synthetic method for the synthesis of novel double-metal layer double hydroxide amorphous nanostructures.

关键词： Crystalline Cu_(2)O Amorphous Ti-Fe LDH Z-scheme mechanism Charge separation Photodegradation