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Ultrasensitive On-Site Colorimetric Detection of Campylobacter in Oyster with a Portable Biosensing Platform Based on Hydroxamate/Fe3+-Violurate Chromogenic Reaction and Smartphone

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SSRN 2024年

作者： Wang, Yuan Liu, Weixing Chi, Jingtian Wang, Zhuangzhuang Ju, Peng Ding, Yuanyuan Chi, Zhe College of Marine Life Sciences Ocean University of China Qingdao266003 China Key Laboratory of Marine Eco-Environmental Science and Technology Marine Bioresource and Environment Research Center First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China College of Chemistry and Chemical Engineering Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao266100 China

The contamination of Campylobacter spp. in shellfish poses a health risk due to its pathogenicity to campylobacteriosis. However, an efficient detection approach for Campylobacter in shellfish and their culture-environments is unavailable. Herein, we introduce a portable colorimetric biosensing platform that achieves high-throughput, ultrasensitive, and on-site detection of Campylobacter. This platform is facilitated by an enriching module 1, a binding-transducing module 2, and a smartphone-based module 3. Module 1 is an aptamer-modified 96-well plate for specific capturing Campylobacter from shellfish sample in a simple and high-throughput manner;module 2 is a bifunctional biopolymer of L-Glutamic acid g-hydroxamate-alginate-Fe3+ coordinating fusarinine C, which can bind to the module 1-captured Campylobacter and transduce the bacterial densities to amplified color signals on reacting with Fe3+-violurate complexes. Module 1 achieves a capture efficiency of 97.24%, and the subsequently added module 2 sensitively indicates 101-106 CFU/mL, achieving an actual LOD of 6 CFU/mL validated by using Campylobacter single-cells. Remarkably, the generated colors can be recognized and output to cell densities by module 3 with high sensitivity. Thereby, this biosensor-smartphone platform can detect low-density Campylobacter contamination in oyster in a high-throughput and ultrasensitive manner, showcasing a novel proof-of-principle for accurate on-site colorimetric detection of Campylobacter regarding shellfish farming. © 2024, The Authors. All rights reserved.

关键词： Shellfish

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Integration of AU Nanoparticles and Metal-Organic Frameworks in Hollow Double-Shelled Nanoreactor for Efficient Tandem Catalysis

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SSRN 2022年

作者： Wang, Xinxin Hou, Yueming Wang, Xiaomei Guo, Yingchun Zhang, Xu Hebei key Laboratory of Functional Polymers School of Chemical Engineering and Technology Hebei University of Technology Tianjin300130 China Key Laboratory of Special Functional Materials for Ecological Environment and Information School of Materials Science and Engineering Hebei University of Technology Ministry of Education Tianjin300130 China

Tandem reactions make it possible to convert simple raw materials into desired products without separating and purifying intermediates. Integrating metal-organic frameworks (MOFs) and highly reactive metal nanoparticles (NPs) into a tandem system promises the synthesis of a prospective multifunctional nanoreactor due to their synergistic catalytic effects. However, conventional catalysts are difficult to spatially distribute the active sites in a controlled manner, preventing efficient tandem catalysis. Herein, we designed a mesoporous silica-stabilized double-shelled microcapsule nanoreactor for a two-step catalytic Knoevenagel condensation-hydrogenation reaction. The microcapsule is composed of hollow structured ZIF-8 as the inner shell, mesoporous SiO2 as the outer shell, with Au nanoparticles (Au NPs) confined between the two shell layers and is named H-ZIF-8/Au@mSiO2 . Furthermore, the nanoreactor exhibited excellent catalytic performance for the two-step reaction under mild conditions, reaching 99.8% conversion of p -nitrobenzaldehyde and 99.6% yield of 2-(4-aminobenzylidene) malononitrile. Turnover frequency (TOF) of the nanoreactor was as high as 275.0 h-1 . Importantly, the catalytic activity of H-ZIF-8/Au@mSiO2 was maintained after five cycles due to the protective effect of the double-shell layer. This work exploits a unique structure that integrates multiple active sites through spatial separation, offering possibilities for designing multifunctional nanoreactors for other complex molecules. © 2022, The Authors. All rights reserved.

关键词： Organometallics

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Electrodeposition Nanofabrication of Graphene Oxide/Polypyrrole Electrodes with High Hybrid Specific Capacitance for Enhancing U(VI) Electrosorption

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SSRN 2023年

作者： Shuang, Mengting Zhou, Limin Liu, Yanlin Yu, Hailan Ao, Xianqian Ouyang, Jinbo Liu, Zhirong Shehzad, Hamza Adesina, Adesoji A. Jiangxi Province Key Laboratory of Synthetic Chemistry East China University of Technology Nanchang330013 China State Key Laboratory for Nuclear Resources and Environment East China University of Technology 418 Guanglan Road Nanchang330013 China School of Chemical Sciences and Engineering University of New South Wales Sydney2035 Australia

The uranium-containing wastewater generated in the nuclear fuel cycle poses a serious threat to the environmental ecosystem, and electrosorption can be an effective method for U(VI) removal. Herein, the electrodeposition nanofabrication of a novel composite electrode (GO/PPy) with high hybrid specific capacitance for U(VI) electrosorption. The results showed that the combination of GO with PPy significantly improved the specific capacitance, conductivity and cycling ability, which thereby enhances U(VI) electrosorption. Among various GO/PPy composites, GO/PPy-0.2 presented the highest specific capacitance, and its electrosorption capacity of U(VI) was also the highest, owing to its high specific capacitance and open interlayer channels for ion storage. The cyclic voltammetry characteristic of GO/PPy-0.2 is characterized by capacitive control, which highlights the contribution of PPy pseudocapacitance to electrosorption. The isotherms and kinetics of U(VI) electrosorption were found to be well-simulated by the Langmuir model and the PFO model, respectively. The maximum U(VI) electrosorption capacity reached 246.5 mg/g at pH 4.0 and 0.9V. The electrosorption mechanism involves EDL and pseudocapacitance adsorption (ion intercalation or redox mechanism), as well as the complexation of pyrrole N with uranyl ions. The simple preparation, excellent electrochemical and electrosorption performance of GO/PPy-0.2 highlights its application in radioactive contamination treatment. © 2023, The Authors. All rights reserved.

关键词： Polypyrroles

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The use of mutant and engineered microbial agents for biological control of plant diseases caused by Pythium: Achievements versus challenges

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FUNGAL BIOLOGY REVIEWS 2022年 40卷 76-90页

作者： Chen, Siqiao Daly, Paul Zhou, Dongmei LI, Jingjing Wang, Xiaoyu Deng, Sheng Feng, Hui Wang, Chunting Sheikh, Taha Majid Mahmood Chen, Yifan Xue, Taiqiang Cai, Feng Kubicek, Christian P. Wei, Lihui Druzhinina, Irina S. [a]Institute of Plant Protection Jiangsu Academy of Agricultural Sciences Nanjing 210014 People's Republic of China [b]Key Laboratory of Plant Immunity Fungal Genomics Laboratory (FungiG) Nanjing Agricultural University 210095 Nanjing People's Republic of China [c]College of Food and Bioengineering Henan University of Science and Technology Luoyang Henan 471000 People's Republic of China [d]Institute of Chemical Environmental & Bioscience Engineering (ICEBE) TU Wien Austria [e]School of Environment and Safety Engineering Jiangsu University Zhenjiang 212013 People's Republic of China

Pythium species are devasting pathogens causing major crop losses, e.g., damping-off in sugar beet caused by Pythium ultimum and root-rot of tomato caused by Pythium aphanidermatum. The use of natural antagonistic microorganisms is a promising environmentfriendly approach to control Pythium-caused plant diseases. There are several examples of biocontrol of diseases caused by Pythium species but the application of bioeffectors (biological control agents) is limited for various reasons, including the restricted amount of gene-modification based biotechnological progress. The regulations in many countries prevent genetically modified bioeffectors from being routinely deployed in field conditions. Our two connected aims in this review are (1) to compile and assess achievements in genetic modification of bioeffectors which have been tested for parasitism or antagonism towards a Pythium plant pathogen or biocontrol of a plant disease caused by a Pythium species, and (2) discuss how a better performing bioeffector could be engineered to improve biocontrol of Pythium-caused plant diseases. We focus on the role of seven key mechanisms: cellulases, carbon catabolite de-repression, glycosylation, reactive oxygen species, chitin re-modelling, proteases, and toxic secondary metabolites. Genetic modifications of bioeffectors include gene deletion and overexpression, as well as the replacement of promoter elements to tune the gene expression to the presence of the pathogen. Gene modifications are limited to fungal and bacterial bioeffectors due to the difficulty of gene modification in oomycete bioeffectors such as Pythium oligandrum. We assess how previous gene modifications could be combined and what other gene modification techniques could be introduced to make improved bioeffectors for Pythium-caused plant diseases. The broad host-range of Pythium spp. suggests engineering improved antagonistic traits of a bioeffector could be more effective than engineering plant-mediated tra

关键词： Republic of China 27 October 2021 Antagonism Bioeffector Biological control Pythium Trichoderma

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Ca-Doped La0.5Ba0.5FeO3-δAs an Efficient Cathode Material for Proton-Conducting Direct Ammonia Fuel Cells

ACS Electrochemistry

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ACS Electrochemistry 2024年第1期1卷 63-72页

作者： Shenglin Liu Menglin Wu Chaozhong Wang Yihang Li Tong Liu Jiupai Ni John Irvine Chengsheng Ni College of Resources and Environment Southwest University Chongqing 400715 China；Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 211189 Jiangsu China College of Resources and Environment Southwest University Chongqing 400715 China；Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China College of Resources and Environment Southwest University Chongqing 400715 China Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary Research Xidian University Xi’an 710071 P. R. China Key Laboratory of Green Chemical Process of Ministry of Education Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan 430205 China College of Resources and Environment Southwest University Chongqing 400715 China；School of Chemistry University of St Andrews St Andrews KY16 9ST United Kingdom

Sr or Ca doping on the Ba site of layered perovskites is reported to increase oxygen reduction reaction catalytic activity, but the underlying mechanism of this phenomenon for the protonic cell is not clear. In this research, Ca containing La0.5(Ba0.5–xCax)FeO3-δ(0≤x≤0.3) perovskites are explored as cathodes for proton-conducting direct ammonia fuel cells. La0.5Ba0.5FeO3-δ(LBF) has mixed cubic and tetragonal phases with cation ordering, and the Ca doping generally increases the oxide-ion conductivity because it could increase the stability of random cation distribution on the A site and facilitate the formation of oxide ion vacancy in the layer according to the density-function theory (DFT) calculation. The surface exchange coefficient (2.00 × 10–5cm s–1) and the chemical diffusion coefficient (4.01 × 10-10cm2s–1) are enhanced to 8.56 × 10–5cm s–1and 7.37 × 10–9cm2s–1, respectively, when the Ca content increased from 0 to 30%. For electrochemical tests, the single cell with a cathode of cubic La0.5(Ba0.45Ca0.05)FeO3−δbased on BaZr0.1Ce0.7Y0.2O3(BZCY) electrolyte shows a polarization resistance of 0.058 Ω cm2at 700 °C, imparting a peak power density of 682 mW cm–2under NH3fuel. The Ca2+doping abovex= 0.05 would decrease the cell output or stability for continuous operation in fuel-cell mode because of the decreased protonic conductivity that could localize the site for water production. This research highlights the effect of isovalent Ca2+doping on the Ba2+site and demonstrates the possibility for a proton conducting cathode for direct ammonia fuel cell.

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Physiological and Biochemical Responses of Leersia Hexandra Swartzto Nickel Stress: Insights into Antioxidant Defense Mechanisms and Metal Detoxification Strategies

SSRN

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SSRN 2023年

作者： Chen, Mouyixing Jiang, Pingping Zhang, Xuehong Sunahara, Geoffrey I. Liu, Jiu Yu, Guo College of Environmental Science and Engineering Guilin University of Technology Guilin541004 China College of Earth Sciences Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Exploration for Hidden Metallic Ore Deposits Guilin541004 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin China School of Water Resources and Environment Research Center of Environmental Science and Engineering

Phytoremediation is widely considered as a cost-effective method for managing heavy metal soil pollution. Leersia hexandra Swartz shows a promising potential for the remediation of heavy metals pollution, including Cr, Cu, and Ni. It is vital to understand the physiological and biochemical responses of L. hexandra to Ni stress to elucidate the mechanisms underlying Ni tolerance and accumulation. Here, we examined the sublethal and transcriptomic responses of L. hexandra exposed to 40 mg/L Ni for 24 h and 14 d. After 24-h Ni stress, the plant leaf gene expression of GSTF1, GSTU1, MDAR4, and SODCC2 was significantly increased. Furthermore, after 14-d Ni stress, the APX7, SODCP, SOD1, and CAT gene expression was significantly upregulated, but that of EMB2360, GSTU1, GSTU6, GSH2, GPX6, and MDAR2 was downregulated. After 24-h Ni stress, the differentially expressed metabolites (DEMs) were mainly flavonoids (45%) and flavones (20%). However, after 14-d Ni stress, the DEMs were mainly carbohydrates and their derivatives (34%), amino acids and derivatives (15%), and organic acids and derivatives (8%). Results suggest that L. hexandra adopt distinct time-dependent antioxidant and metal detoxification strategies likely associated with intracellular reduction–oxidation balance. Novel insights into the molecular mechanisms responsible for Ni tolerance in plants are presented. © 2023, The Authors. All rights reserved.

关键词： Nickel

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Permafrost changes in the Nanwenghe Wetlands Reserve on the southern slope of the Da Xing'anling‒Yile'huli mountains,Northeast China

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Advances in Climate Change Research 2021年第5期12卷 696-709页

作者： HE Rui-Xia JIN Hui-Jun LUO Dong-Liang LI Xiao-Ying ZHOU Chuan-Fang JIA Ning JIN Xiao-Ying LI Xin-Yu CHE Tao YANG Xue WANG Li-Zhong LI Wei-Hai WEI Chang-Lei CHANG Xiao-Li YU Shao-Peng State Key Laboratory of Frozen Soils Engineering and Da Xing'anling Observation and Research Station of Frozen-Ground Engineering and Environment Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou73000China Institute of Cold Regions Science and Engineering School of Civil EngineeringNortheast-China Observatory and Research-Station of Permafrost Geo-Environment(Ministry of Education)and Northeast Forestry UniversityHarbin150040China School of Geography and Tourism Harbin UniversityHarbin150086China Harbin Center for Natural Resources Survey Geological Survey of ChinaHarbin150086China School of Civil Engineering Harbin Institute of TechnologyHarbin150090China China Forest Ecological Research Network(CFERN)Station at the Headwater Area of Nenjiang River Daxing'anling Institute of Agriculture and ForestryDaxing'anling Forestry GroupJagdaqi165100China National-Local Joint Engineering Laboratory of Geo-Spatial Information Technology Hunan University of Science and TechnologyXiangtan411201China

The Nanwenghe Wetlands Reserve in the Yile'huli Mountains is a representative region of the Xing'an *** response of permafrost to climate change remains unclear due to limited field ***,longer-term responses of the ground thermal state to climate change since 2011 have been monitored at four sites with varied surface characteristics:Carex tato wetland(P1)and *** wetland(P2)with a multi-year average temperatures at the depth of zero annual amplitude(T_(ZAA))of−0.52 and−1.19℃,respectively;Betula platyphylla-Larix gmelinii(Rupr.)Kuzen mixed forest(P3)with T_(ZAA) of 0.17℃,and;the forest of ***(Rupr.)Kuzen(P4)with T_(ZAA) of 1.65℃.Continuous observations demonstrate that the ecosystem-protected Xing'an permafrost experienced a cooling under a warming *** temperature at the top of permafrost(TTOP)rose(1.8℃ per decade)but the TZAA declined(−0.14℃ per decade),while the active layer thickness(ALT)thinned from 0.9 m in 2012 to 0.8 m in 2014 at *** the TTOP and TZAA increased(0.89 and 0.06℃ per decade,respectively),but the ALT thinned from 1.4 m in 2012 to 0.7 m in 2016 at *** detached permafrost at P3 disappeared in summer 2012,with warming rates of+0.42 and+0.17℃ per decade for TTOP and T_(ZAA),***,up to date,the ground thermal state has remained stable at *** conclude that the thermal offset is crucial for the preservation and persistence of the Xing'an permafrost at the southern fringe.

关键词： Nanwenghe wetland reserve Permafrost Climate change Active layer thickness Ground thermal state Thermal offset Local environmental factors

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Degrading permafrost and its impacts

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Advances in Climate Change Research 2021年第1期12卷 1-5页

作者： JIN Hui-Jun WU Qing-Bai Vladimir E.ROMANOVSKY Northeast-China Observatory and Research Station of Permafrost Geological Environment(Ministry of Education) School of Civil EngineeringInstitute of Cold Region Scienceand TechnologyNortheast Forestry UniversityHarbin150040China State Key Laboratory of Frozen Soils Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Geophysical Institute University of Alaska FairbanksFairbanks99775USA

*** Permafrost is present extensively in polar,high-plateau,alpine,and mountainous regions,with a model-estimated total extent of permafrost regions at 22.79 million km^(2)(Gruber,2012).However,among ever increasing modeling results,these estimates are based on applications of different permafrost models of various validity,but with a large range of *** affects terrestrial ecosystems and ground hydrothermal dynamics,biogeochemical cycles,engineered infrastructures,and socioeconomic development to varied *** a warming climate,permafrost has been degrading *** studies have been flourishing due to increasing concerns on the climatic feedbacks of permafrost carbon,ecological impacts from degrading permafrost,sustainable water supplies,and engineering ramifications.

关键词： terrestrial mountainous plateau

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Effect of Pore Characteristics on CO2 Adsorption Performance of Coal Slime with Different Metamorphic Degrees

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SSRN 2024年

作者： Kong, Xiangguo Lin, Xi Cai, Yuchu Chen, Liang Hu, Jie Zhou, Yuxuan Ji, Pengfei He, Di College of Safety Science and Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China Key Laboratory of China Western Mine and Hazard Prevention Ministry of Education of China Shaanxi Xi’an710054 China School of Chemistry and Chemical Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China School of Energy & Environment Engineering Zhongyuan University of Technology Henan Zhengzhou450007 China

With the rapid development of Carbon Capture, Utilization and Storage (CCUS) technology, it is necessary to explore the feasibility of coal slime as a porous carbon material for CO2 capture. In this paper, scanning electron microscopy (SEM) was used to observe the morphological characteristics of coal slime samples with different metamorphic degrees, and the pore structure of coal slime was explored by low temperature N2 adsorption and low-pressure CO2 adsorption experiments. The pore distribution characteristics were analyzed, and the adsorption law of different metamorphic degrees were summarized through CO2 isothermal adsorption experiments. The results showed that: numerous parallel plate pores existed in coal slime. The specific surface area (SSA) and pore volume (PV) of the mesopores of the coal slime exhibited a U-shaped distribution with coal rank, and are much smaller than that of its micropores. Micropores smaller than 2 nm are the main adsorption space of the coal slime and dominate in all stages. The linear correlation fitting coefficients R2 between the limiting adsorbed amount a of CO2 and the micropores PV and the SSA were up to 0.830 and 0.887, respectively. The a-value trend of a decreases and then increases with Rmax increased. Studying the impact of coal slime on CO2 adsorption performance is of great significance for the safe, efficient and economic capture and sequestration of CO2, and alleviating the serious situation of the environment and realizing the dual-carbon goal. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Electrodeposition Nanofabrication of Carboxylated Carbon Nanotubes/Α-Mno2 Nanorods/ Polypyrrole Composites as High Hybrid Capacitance Electrodes for Efficient U(Vi) Electrosorption

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SSRN 2023年

作者： Liu, Yanlin Zhou, Limin Ouyang, Jinbo Ao, Xianqian Shuang, Mengting Adesina, Adesoji A. State Key Laboratory for Nuclear Resources and Environment East China University of Technology 418 Guanglan Road Nanchang330013 China Jiangxi Province Key Laboratory of Synthetic Chemistry East China University of Technology Nanchang330013 China School of Chemical Sciences and Engineering University of New South Wales Sydney2035 Australia

The uranium-containing wastewater resourced from the nuclear fuel cycle presents serious harm to human health and ecological environment. Herein, carboxylated carbon nanotubes/α-MnO2 nanorods/polypyrrole (CMP) composite as high hybrid capacitance (EDL and pseudocapacitance) electrodes with good electrosorption performance for U(VI) were nanofabricated by the electrodeposition of polypyrrole (PPy) on the surface of carboxylated carbon nanotubes/α-MnO2 nanorods composites using potentiostatic method. The morphology and structure characteristics, electrochemical properties and electrosorption U(VI) properties of the CNT/α-MnO2/PPy composites were systematically investigated. The results show that among the CMP composites obtained at different pyrrole concentrations, CMP-0.10 has the highest specific capacitance (366.97 F/g) , and its electrosorption performance is also the best, which is due to its well balanced porous structure and high hybrid capacitance which favors U(VI) ions transfer and storage. Asymmetrical voltammetry (CV) curves with obvious redox peaks were observed at low sweep speeds, indicating its hybrid capacitance behavior of CMP composites in which the capacitance contribution can be quantified. The electrosorption experiments were performed in a capacitive deionaiztion (CDI) system in which different factors (voltage, pH, U(VI) concentration and contact time, etc.) on the electrosorption of U(VI) were investigated, which shows that high U(VI) removal could be achieved at a wide pH range. The theoretical simulation using different models shows the best fit of the Langmuir model for the electrosorption isotherms and PFO model for the kinetics. The maximum U(VI) electrosorption capacity reaches 339.45 mg/g at 0.9V and pH 4.5 for CMP-0.10, which is 2.76 times of that achieved at 0.0V (122.87 mg/g). The facile fabrication, excellent electrochemical and electrosorption performance as well as good cycling stability for the CMP composites highlight their pote

关键词： Carbon nanotubes

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