检索结果-南通市图书馆

Science China(Life Sciences) 2019年第10期62卷 1275-1286页

作者： Yongguang Jiang Meimei Shi Liang Shi Department of Biological Sciences and Technology School of Environmental StudiesChina University of GeosciencesWuhan 430074 China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

Microbial extracellular electron transfer(EET) is electron exchanges between the quinol/quinone pools in microbial cytoplasmic membrane and extracellular substrates. Microorganisms with EET capabilities are widespread in Earth hydrosphere, such as sediments of rivers, lakes and oceans, where they play crucial roles in biogeochemical cycling of key elements, including carbon,nitrogen, sulfur, iron and manganese. Over the past 12 years, significant progress has been made in mechanistic understanding of microbial EET at the molecular level. In this review, we focus on the molecular mechanisms underlying the microbial ability for extracellular redox transformation of iron, direct interspecies electron transfer as well as long distance electron transfer mediated by the cable bacteria in the hydrosphere.

关键词： microbial extracellular electron transfer molecular mechanisms multiheme c-type cytochrome conductive nanowires, direct interspecies electron transfer cable bacteria biogeochemical cycling of elements Earth hydrosphere

Molecular characterization and toxin quantification of Microcystis panniformis: A microcystin producer in Lake Taihu,China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第2期31卷 359-367页

作者： Yilu Gu Xiaofeng Gao Yongguang Jiang Xin Peng Renhui Li Key laboratory of Algal Biology Institute of HydrobiologyChinese Academy of Sciences Department of Urban Engineering The University of Tokyo School of Environmental Studies China University of Geosciences

Microcystis panniformis is a bloom forming species with flat panniform-like colonies. This species was recently found in Lake Taihu, China. To specifically characterize M. panniformis based on isolated strains, morphological examination on colonial transition and genetic examination are needed. Three M. panniformis strains isolated from a water bloom sample in Lake Taihu were characterized by molecular analysis and toxin quantification. Phylogenetic analysis based on both 16S rRNA gene and internal transcribed spacer(ITS) between 16S and 23S rRNA genes were performed and compared to facilitate easy identification of the species.Relatively high similarities(98%–99%) were shown in 16S rDNA sequences between the strains of M. panniformis and those of other Microcystis species, whereas the similarities for ITS sequences were 88%–95%. In the phylogenetic tree based on the 16S rDNA sequences, the M. panniformis and M. aeruginosa strains were intermixed together with no clear division,whereas all of the M. panniformis strains were clustered together in a single clade based on the ITS sequences based phylogenyetic tree. The mcyE gene was detected in all three strains, and microcystin was determined by high-performance liquid chromatography. The molecular detection and toxin production of M. panniformis strains are of great significance for the environmental risk assessment of Microcystis blooms.

关键词： Microcystis panniformis Blooms ITS of 16S-23S rRNA mcyE Microcystin Taihu

Dissolved metal ion removal by online hollow fiber ultrafiltration for enhanced size characterization of metal-containing nanoparticles with single-particle ICP-MS

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第4期126卷 494-505页

作者： Haowen jiang YingWang Zhiqiang Tan Ligang Hu Jianbo Shi Guangliang Liu yongguang Yin Yong Cai Guibin jiang Laboratory of Environmental Nanotechnology and Health Effect Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry and Biochemistry Florida International UniversityMiami 33199USA School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China

Single particle-inductively coupled plasma mass spectrometry (SP-ICP-MS) is a powerful tool for size-characterization of metal-containing nanoparticles (MCNs) at environmentally relevant concentrations,however,coexisting dissolved metal ions greatly interfere with the accuracy of particle size analysis.The purpose of this study is to develop an online technique that couples hollow fiber ultrafiltration (HFUF) with SP-ICP-MS to improve the accuracy and size detection limit of MCNs by removing metal ions from suspensions of MCNs.Through systematic optimization of conditions including the type and concentration of surfactant and complexing agent,carrier pH,and ion cleaning time,HFUF completely removes metal ions but retains the MCNs in suspension.The optimal conditions include using a mixture of 0.05 vol.%FL-70 and 0.5 mmol/L Na2S2O_(3)(pH=8.0) as the carrier and 4 min as the ion cleaning time.At these conditions,HFUF-SP-ICP-MS accurately determines the sizes of MCNs,and the results agree with the size distribution determined by transmission electron microscopy,even when metal ions also are present in the sample.In addition,reducing the ionic background through HFUF also lowers the particle size detection limit with SP-ICP-MS (e.g.,from 28.3 to 14.2 nm for gold nanoparticles).This size-based ion-removal principle provided by HFUF is suitable for both cations (e.g.,Ag+) and anions (e.g.,AuCl_(4)^(-)) and thus has good versatility compared to ion exchange purification and promising prospects for the removal of salts and macromolecules before single particle analysis.

关键词： Hollow fiber ultrafiltration(HFUF) Single particle-inductively coupled plasma mass spectrometry (SP-ICP-MS) Removal of ions Particle size characterization

Dithizone-functionalized C18 online solid-phase extraction-HPLC-ICP-MS for speciation of ultra-trace organic and inorganic mercury in cereals and environmental samples

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第5期34卷 403-410页

作者： Ying Wang Ailing Zhu Yingying Fang Changjun Fan Yanli Guo Zhiqiang Tan yongguang Yin Yong Cai Guibin jiang Laboratory of Environmental Nanotechnology and Health Effect Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Shimadzu China Innovation Center Shimadzu(China)Co.LTDBeijing 100020China Department of Chemistry and Biochemistry Florida International UniversityMiamiFL 33199United States

A simple and efficient dithizone-functionalized solid-phase extraction(SPE)procedure,online coupled with high-performance liquid chromatography(HPLC)-inductively coupled plasma mass spectrometry,was developed for the first time for enrichment and determination of ultra-trace mercury(Hg)species(inorganic divalent Hg(Hg(Ⅱ)),methylmercury(CH_(3)Hg(Ⅱ))and ethylmercury(C_(2)H_(5)Hg(Ⅱ))in cereals and environmental samples.In the proposed method,functionalization of the commercial C_(18) column with dithizone,enrichment,and elution of the above Hg species can be completed online with the developed SPE device.A simple solution of 2-mercaptoethanol(1%(V/V))could be used as an eluent for both the SPE and HPLC separation of Hg species,significantly simplifying the method and instrumen-tation.The online SPE method was optimized by varying dithizone dose,2-mercaptoethanol concentration,and sample volume.In addition,the effect of pH,coexisting interfering ions,and salt effect on the enrichment was also discussed.Under the optimized conditions,the detection limits of Hg species for 5 mL water sample were 0.15 ng/L for Hg(Ⅱ),0.07 ng/L for CH_(3)Hg(Ⅱ),and 0.04 ng/L for C_(2)H_(5)Hg(Ⅱ)with recoveries in the range of 85%-100%.The developed dithizone-functionalized C_(18) SPE column can be reused after a single function-alization,which significantly simplifies the enrichment step.Moreover,the stability of Hg species enriched on the SPE column demonstrated its suitability for field sampling of Hg species for later laboratory analysis.This environment-friendly method offers a robust tool to detect ultra-trace Hg species in cereals and environmental samples.

关键词： Mercury speciation Online solid-phase extraction HPLC-ICP-MS Dithizone Cereals Natural water

Recent advances in speciation analysis of mercury,arsenic and selenium

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第2期58卷 150-161页

作者： YIN yongguang LIU JingFu jiang GuiBin State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Mercury(Hg),arsenic(As) and selenium(Se) are ubiquitous in the environment and exist in a variety of species,which have great influence on their transport,bioaccumulation and toxicity.This review presents the recent research progress in speciation analysis of Hg,As,and Se,with emphasis on enhanced cold vapor generation as interface for liquid chromatography and atomic spectrometry,speciation of volatile species in gas phase,and isotope dilution technique to improve the precision and accuracy of speciation.Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry to measure species-specific isotopic ratios,are also briefly discussed.

关键词：形态分析电感耦合等离子体汞砷硒同位素稀释法植物螯合肽同位素比值

Electromicrobiology and biotechnological applications of the exoelectrogens Geobacter and Shewanella spp.

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第10期62卷 1670-1678页

作者： SHI MeiMei jiang yongguang SHI Liang Department of Biological Sciences and Technology School of Environmental StudiesChina University of GeosciencesWuhan430074China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430074China

Electromicrobiology is a sub-discipline of microbiology that investigates electrical interplay between microorganisms and redox active materials, such as electrodes and solid-phase minerals, and the mechanisms underlying microbial ability to exchange electrons with the redox active materials that are external to the microbial cells. The microorganisms with extracellular electron transfer capability are often referred to as exoelectrogens. Although exoelectrogens were documented in early 1900’s, discovery of the dissimilatory metal-reducing microorganisms Geobacter and Shewanella spp. in late 1980’s marked the beginning of modern electromicrobiology. Since then, thorough and rigorous studies have made Geobacter and Shewanella spp. the two best characterized groups of exoelectrogens. These include identification and characterization of the molecular mechanisms for exchanging electrons with electrodes by Geobacter sulfurreducens and Shewanella oneidensis. In addition, a variety of applications of Geobacter and Shewanella spp. in microbial fuel cells and electrobiosynthesis, such as maintenance of redox balance during fermentations and bioremediations, have also been developed. This review briefly discusses the molecular mechanisms by which G. sulfurreducens and S. oneidensis exchange electrons with electrodes and then focuses on biotechnological applications of Geobacter and Shewanella spp. in microbial fuel cells and electrobiosynthesis as well as the future directions of this research area.

关键词： electromicrobiology exoelectrogen Geobacter Shewanella microbial fuel cells electrobiosynthesis

Corrigendum to“Dithizone-functionalized C18 online solid-phase extraction-HPLC-ICP-MS for speciation of ultra-trace organic and inorganic mercury in cereals and environmental samples”Journal of Environmental Science 115(2022)403-410

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第2期124卷 963-964页

The authors regretThe authors would like to apologize for any inconvenience caused.

关键词： Figure mercury phase

Water chemistry controlled aggregation and photo-transformation of silver nanoparticles in environmental waters

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第8期27卷 116-125页

作者： yongguang Yin Xiaoya Yang Xiaoxia Zhou Weidong Wang Sujuan Yu Jingfu Liu Guibin jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences School of the Environment Jiangsu University Institute of Environment and Health Jianghan University

The inevitable release of engineered silver nanoparticles（Ag NPs） into aquatic environments has drawn great concerns about its environmental toxicity and safety. Although aggregation and transformation play crucial roles in the transport and toxicity of Ag NPs, how the water chemistry of environmental waters influences the aggregation and transformation of engineered Ag NPs is still not well understood. In this study, the aggregation of polyvinylpyrrolidone（PVP） coated Ag NPs was investigated in eight typical environmental water samples（with different ionic strengths, hardness, and dissolved organic matter（DOM） concentrations） by using UV–visible spectroscopy and dynamic light scattering. Raman spectroscopy was applied to probe the interaction of DOM with the surface of Ag NPs. Further, the photo-transformation and morphology changes of Ag NPs in environmental waters were studied by UV–visible spectroscopy, inductively coupled plasma mass spectrometry, and transmission electron microscopy. The results suggested that both electrolytes（especially Ca2＋and Mg2＋） and DOM in the surface waters are key parameters for Ag NP aggregation, and sunlight could accelerate the morphology change, aggregation, and further sedimentation of Ag NPs. This water chemistry controlled aggregation and photo-transformation should have significant environmental impacts on the transport and toxicity of Ag NPs in the aquatic environments.

关键词： Silver nanoparticles（AgNPs） Aggregation Transformation Water chemistry Sunlight

Regional relationship between the jiang-Huai Meiyu and the equatorial surface-subsurface temperature anomalies

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第1期54卷 113-119页

作者： QIAN WeiHong ZHU jiang WANG yongguang FU JiaoLan Department of Atmospheric Science Peking University Beijing100871 China National Climate Center Beijing 100081 China

The jiang-Huai Meiyu rainy season can be distinguished into the jiangnan Meiyu spell and the Huaihe Meiyu spell. The jiangnan Meiyu spell appears on the last ten days in June and the Huaihe Meiyu spell lasts from early July to middle July. An inter-decadal transition was observed in 1998 respectively from the anomalies of jiangnan Meiyu rainfall,the sea surface temperature (SST),and the subsurface tem-perature in the equatorial Pacific. Since the beginning of the 21st century,opposite trends and biennial oscillations of the Meiyu rainfall are observed in the jiangnan and Huaihe basins. Before the strong La Nia of 1999―2000,the positive SST anomalies usually occurred in the eastern equatorial Pacific. Since the beginning of the 21st century,a precursory warming signal of SST anomaly comes from the subsurface temperature which is centrally exposed near the dateline in the central equatorial Pacific. The above-normal Meiyu rainfall in 2003,2005 and 2007 over the Huaihe basin followed the prior winter-spring positive SST anomaly near the dateline. A relationship shows that the more jiangnan (Huaihe) Meiyu follows the winter-spring warm water in the eastern (central) equatorial Pacific.

关键词：长江流域淮河流域梅雨季节赤道温度

Chromatin remodeling factor lymphoid.specific helicase inhibits ferroptosis through lipid metabolic genes in lung cancer progression

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2017年第12期36卷 669-671页

作者： Yiqun jiang Yuchen He Shuang Liu yongguang Tao Key Laboratory of Carcinogenesis and Cancer Invasion Ministry of EducationXiangya HospitalCentral South UniversityChangsha 410008HunanP.R.China Key Laboratory of Carcinogenesis Ministry of HealthCancer Research InstituteSchool of Basic MedicineCentral South UniversityChangsha 410078HunanP.R.China Institute of Medical Sciences Xiangya HospitalCentral South UniversityChangsha 410008HunanP.R.China Department of Thoracic Surgery Second Xiangya HospitalCentral South UniversityChangsha 410011HunanP.R.China

Ferroptosis, a novel mode of non-apoptotic cell death,involves a metabolic dysfunction that results in the production of iron-dependent reactive oxygen species (ROS),an iron carrier protein (transferrin), intracellular metabolic process, and related regulators (e.g., p53 protein).Previous studies have linked ferroptosis with oncogenic Ras [1], and p53 tumor suppressor positively regulates ferroptosis by transcriptionally inhibiting the expression of the cysteine/glutamate antiporter, which is encoded by the SLC7A11 gene in human [1, 2]. Whether other factors such as epigenetic factors are involved in the process remains less known.Chromatin modifier lymphoid specific helicase (LSH)contributes to the malignant progression of nasopharyngeal carcinoma and glioma [3]. We recently indicated that LSH was shown to co-operate with partners, such as G9a, to drive cancer progression [4, 5].

关键词： Ferroptosis, a novel mode of non-apoptotic cell death