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Anaerobic degradation of xenobiotic organic contaminants(XOCs):The role of electron flow and potential enhancing strategies

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Journal of Environmental Sciences 2021年第3期33卷 397-412页

作者： Yijing Li Shanghua Wu shijie wang shijie Zhao Xuliang Zhuang Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Sino-Danish Center University of Chinese Academy of SciencesBeijing 100049China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

In groundwater,deep soil layer,sediment,the widespread of xenobiotic organic contaminants(XOCs)have been leading to the concern of human health and eco-environment safety,which calls for a better understanding on the fate and remediation of XOCs in anoxic *** the absence of oxygen,bacteria utilize various oxidized substances,***,sulphate,metallic(hydr)oxides,humic substance,as terminal electron acceptors(TEAs)to fuel anaerobic XOCs *** there have been increasing anaerobic biodegradation studies focusing on species identification,degrading pathways,community dynamics,systematic reviews on the underlying mechanism of anaerobic contaminants removal from the perspective of electron flow are *** this review,we provide the insight on anaerobic biodegradation from electrons aspect-electron production,transport,and *** mechanism of the coupling between TEAs reduction and pollutants degradation is deconstructed in the level of community,pure culture,and cellular ***,relevant strategies to promote anaerobic biodegradation are proposed for guiding to an efficient XOCs bioremediation.

关键词： Organic contamination Anoxic environment Anaerobic biodegradation Terminal electron acceptor processes(TEAPs)

Effect of CO_2 Gas on the Swelling and Tribological Behaviors of NBR Rubber in Water

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Journal of Materials Science & Technology 2015年第12期31卷 1282-1288页

作者： Xiaoren Lv Shuyuan Song Huiming wang shijie wang School of Mechanical Engineering Shenyang University of Technology

The swelling and tribological behaviors of nitrile-butadience（NBR） rubbers with three acrylonitrile contents（N18,N26 and N41） in water with different CO 2 gas flows are investigated by immersion and wear *** results show that the bubbles of CO 2 into water severely destroy the cross-linking network of rubber and form defects on the surface,such as cracks,holes and lamellar *** defects lead to an increase in the static and dynamic swelling *** dynamic swelling increment is almost three or four times larger than the static swelling *** hardness and wear resistance of rubbers in water with CO 2 gas remarkably decreases in contrast to that in water,and they gradually decrease with an increase in the gas flow in *** bubbles of CO 2 decrease the steady frictional coefficient of rubber in water due to the presence of the gas in water lubricant *** steady frictional coefficient in water with different CO 2 gas flow basically remains 0.1.N41 with high acrylonitrile content shows better swelling and wear resistances than N18 and N26 because of its dense molecular network.

关键词： CO2 NBR rubber Water Swelling Wear

Transmission of oxygen isotope signals of precipitation-soil water-drip water and its implications in Liangfeng Cave of Guizhou,China

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Chinese Science Bulletin 2008年第21期53卷 3364-3370页

作者： LUO WeiJun wang shijie State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

According to systemically monitoring results of oxygen(hydrogen) isotope compositions of precipita-tion,soil waters,soil CO2,cave drip waters and their corresponding speleothems in Liangfeng Cave(LFC) in Guizhou Province,Southwest China,it is found that local precipitation is the main source of soil waters and drip waters,and that the amplitudes of those δ 18O values of three waters(precipitation,soil water and drip water) decrease in turn in the observed year,which are 0‰ to -10‰, -2‰ to -9‰ and -6‰ to -8‰,***,the δ 18O values for three waters show a roughly simultaneous variation,namely,that those values are lighter in the rainy seasons,weightier in the dry seasons,and that the average δ 18O value of drip waters is about 0.3‰ weightier than that of precipitation,which is modified by surface evaporation *** also find that oxygen isotope equilibrium is reached or neared in the formation processes of speleothems in LFC system,and that it is feasible to reconstruct paleotemperature and paleoprecipitation by using δ 18O values of ***,it should be noted that surface evaporation would affect the oxygen isotope values in the study area.

关键词：贵州氧化同位素洞穴堆积物古代气候

Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas

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Acta Geochimica 2017年第2期36卷 205-212页

作者： Xianqiang Zhang Yuzhong Zhao shijie wang Anshun University Anshun 560000 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China Guizhou Minzu University Guiyang 550025 China

Barbula fallax Hedw., Erythrodontium julaceum(Schwaegr.) Par., and Bryum argenteum Hedw. are typical rock mosses growing on rocks in different terrestrial habitats. In this study, B. fallax and E. julaceum, which are epilithic mosses growing in rock desertification in Guizhou, China, were used as ecophysiological mosses in a combination of field investigations and laboratory experiments. We also investigated the reference moss B. argenteum, which is a widely distributed moss in habitats with soil as substrate. Our research focused on the response of the antioxidant defense system of epilithic mosses to drought stress. Most antioxidant defense indicators increased initially, then declined at later stages of drought stress. In contrast, the carotenoid content increased constantly. In addition, there was an initial increase(albeit variable) in relative membrane permeability, with this parameter showing a parabolic trend in all of the epilithic mosses. Among the three species, E. julaceum demonstrated the strongest resistance followed by B. fallax and then by B. argenteum. The epilithic mosses displayed stronger resistance compared to the native mosses; the increase in O_2 content and other reactive oxygen species(ROS) at the early stage of drought stress induced the enzymatic and non-enzymatic scavenging systems tosequester ROS. Moreover, the radical scavenging ability and strong drought tolerance was maintained. The longterm growth of bryophyte under drought conditions in a karst environment can help eliminate the intense response of mosses to drought stress as they adapt.

关键词： Rocky desertification of karst Epilithicmosses Antioxidase system Drought stress

Nutrient uptake by mulberry and Chinese prickly ash associated with arbuscular mycorrhizal fungi

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Acta Geochimica 2016年第2期35卷 120-129页

作者： Hechun Piao Siliang Li shijie wang The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences

Understanding how nutrient absorption processes in plants are related to arbuscular mycorrhizal(AM)association is critical for predicting the effects of AM symbiosis on elemental cycling for plants. Both mulberry(Morus alba) and Chinese prickly ash(Zanthoxylum bungeanum) are AM-associated plants, widely distributed in southwest China. It was hypothesized that if the nutrient absorption processes were efficiently associated with AM symbiosis in both mulberry and Chinese prickly ash, foliar nutrient concentrations—especially calcium(Ca)—would be primarily determined by the soil conditions in different regions. To investigate this, AM colonization levels of soils, nutrient levels in soils and leaves, and δ^(13)C values of leaves were analyzed for mulberry and Chinese prickly *** this study, spore density in soils with low p H was higher than that in soils with high p H. The average concentrations of sugar delivered to roots in both mulberry and Chinese prickly ash in soil with relatively low p H and soil extractable cations were higher than those in other *** values of foliar δ^(13)C in both mulberry and Chinese prickly ash in low soil-pH and soil extractable cations were lower than those in contrast areas, indicating that water availability was impacted by soil characteristics. The efficiency in AM-mediated processes might play an important role in translocation between soil nutrients and plant *** results suggest uptake and translocation of nutrients,especially Ca, in AM-associated plants may be affected by an efficiency of AM-mediated processes. Since Sr does not appear to be similarly affected, expressing Ca and other nutrient concentrations relative to Sr could be used to evaluate whether the uptake and translocation of Ca and other nutrients are affected by AM-mediated processes.

关键词： Arbuscular mycorrhizal fungi - Elementalratio Carbon isotopes Mulberry Chinese prickly ash

Chow-Type Maximal Inequality for Conditional Demimartingales and Its Applications

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Chinese Annals of Mathematics,Series B 2015年第6期36卷 957-968页

作者： Xuejun wang shijie wang Chen XU Shuhe HU School of Mathematical Sciences Anhui University

In this paper,the Chow-type maximal inequality for conditional demimartingales is *** using the Chow-type maximal inequality,the authors provide the maximal inequality for conditional demimartingales based on concave ... 详细信息

关键词： Conditional demimartingales Chow-type maximal inequality ConcaveYoung functions

The application of caesium-137 measurements to estimate recent sedimentation rates in a typical karst depression of Guizhou Plateau, China

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Chinese Journal Of Geochemistry 2011年第1期30卷 84-92页

作者： BAI Xiaoyong ZHANG Xinbao wang shijie State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Karst Ecosystem Observation and Research Station of Puding Institute of Geochemistry Chinese Academy of Sciences Puding 562100 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China

The existing traditional methods of assessing the rates of soil loss have many limitations and are difficult to apply in the karst areas of Southwest China. Karst depressions comprise geomorphologically important sources and sinks for sediments and associated pollutants, yet the sedimentology of many depressions is not well understood. In this paper, the 137Cs technique was employed to investigate recent sedimentation rates in a Chinese polygonal karst depression. The results indicated that the sediment deposition rates ranged from 0.91 to 1.97 mm?a?1 in the period from 1963 to 2007, and the average sediment deposition rate and specific deposit yield of the catchment were estimated to be 1.47 mm?a?1 and 20 t?km?2?a?1, respectively. The results obtained were consistent with the local monitoring data of runoff plots, confirming the validity of the overall approach. It was shown that soil loss rates were very low in some karst areas of Southwest China. Above all, the approach appears to offer valuable potential to study surface erosion by estimating sediment deposition rates of karst depressions, rather than the assessment of complicated soil erosion in stony soils of carbonate rock slopes. In addition, the spacial distribution of surface soil and 137Cs inventories was affected remarkably by the inhomogeneous dissolution of limestone under the soil. It may be an important phenomenon which exists widely in the karst areas and is significantly different from other places.

关键词：喀斯特洼地沉积速率产量估计铯-137 中国贵州高原西南喀斯特地区土壤侵蚀

Characteristics of strontium isotopes and their implications in the Qixing Cave of Guizhou, China

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Chinese Science Bulletin 2011年第7期56卷 670-675页

作者： ZHU XiaoLong wang shijie LUO WeiJun State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550002China Graduate University of Chinese Academy of Sciences Beijing 100049China

The strontium isotopic compositions (87Sr/86Sr) of samples including soils, bedrock, soil waters, drip waters and their corresponding speleothems in the Qixing Cave (QXC), Guizhou Province, China, were systemically measured and analyzed. The results indicate that there are significant Sr isotopic differences among samples. The mean 87Sr/86Sr ratios in drip water for the samples 1#, 4# and 9# were 0.709568, 0.709139 and 0.708761, respectively, which possibly result from different flow paths, residence times, and other hydrogeological processes in the unsaturated zone overlying QXC. Meanwhile, levels of 40.8%, 57.6% and 72.4% of Sr in drip waters for 1#, 4# and 9#, respectively, were derived from bedrock dissolution, which was calculated by the mixture model of the two end-members (soil and bedrock). There is, however, no positive correlation between the relative proportion from bedrock dissolution (δ13C value is 1.8‰) and drip water δ13CDIC values. The mean drip water δ13CDIC value in 1# is the heaviest (–4.5‰) with the lowest contribution rate of bedrock dissolution, whereas the value in 9# is the lightest (–9.3‰) with the highest contribution rate of bedrock dissolution. The proportion from host rock dissolution in 4# is higher than that in 1# and lower than that in 9#, while its mean drip water δ13CDIC value (–8.6‰) is higher than that of 9# and lower than that for 1#. This suggests that the prior calcite precipitation (PCP) processes in the unsaturated zone overlying the cave are responsible for the δ13CDIC value differences between different drip waters, and not bedrock dissolution. Furthermore, this study also demonstrates that the 87Sr/86Sr ratios of speleothems in the 1# and 4# mainly reflect the variation in the relative proportions from the soil system (soil water) and bedrock dissolution overlying the cave. It is, therefore, feasible to use the strontium isotopic signals of speleothems as an indicator for soil chemical weathering intensity, and consequentl

关键词：锶同位素同位素特征贵州省中国洞穴堆积物同位素组成流动路径停留时间

Presenilin and Alzheimer’s disease interactions with aging,exercise and high-fat diet:A systematic review

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BIOCELL 2023年第1期47卷 41-49页

作者： YINGHUI GAO DENGTAI WEN shijie wang JINGFENG wang Ludong University Yantai264025China

Presenilin(Psn)protein is associated with organismal *** in the Psn gene may lead to Alzheimer’s disease(AD),dilated cardiomyopathy(DCM),and many age-dependent degenerative *** diseases seriously affect the quality of life and longevity of the population and place a huge burden on health care and economic systems around the *** have two types of Psn,presenilin-1(PSEN1)and presenilin-2(PSEN2).Mutations in the genes encoding PSEN1,PSEN2,and amyloid precursor protein(APP)have been identified as the major genetic causes of *** is a complex gene strongly influenced by genetic and environmental *** effects of exercise,training,and a high-fat diet on the Psn gene expressed in the heart and its related pathways are not fully ***,relevant aspects of the mutational effects on Psn can be studied experimentally in easily handled animal models,including Drosophila,mice,and other animals,all of which share orthologous genes of Psn with *** previous studies have linked aging,exercise training,and a high-fat diet to the Psn *** review discusses the interrelationship between aging,exercise training,and a high-fat diet on the Psn gene and its associated disease,*** aim is to understand the adverse effects of Psn gene mutations on the body and the diseases caused by AD,find ways to alleviate the adverse effects and provide new directions for the improvement of treatment strategies for diseases caused by Psn gene mutations.

关键词： Genetic mutations Drosophila Cardiac aging Muscle aging Neurodegenerative disease