检索结果-南通市图书馆

Accelerated anaerobic dechlorination of DDT in slurry with Hydragric Acrisols using citric acid and anthraquinone-2,6-disulfonate(AQDS)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第12期27卷 87-94页

作者： Cuiying Liu Xianghua Xu jianling fan Jiangsu Key Laboratory of Agricultural Meteorology College of Applied MeteorologyNanjing University of Information Science and Technology State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences

The application of electron donor and electron shuttle substances has a vital influence on electron transfer,thus may affect the reductive dechlorination of 1,1,1-trichoro-2,2-bis（p-chlorophenyl）ethane（DDT） in anaerobic reaction systems.To evaluate the roles of citric acid and anthraquinone-2,6-disulfonate（AQDS） in accelerating the reductive dechlorination of DDT in Hydragric Acrisols that contain abundant iron oxide,a batch anaerobic incubation experiment was conducted in a slurry system with four treatments of（1） control,（2） citric acid,（3） AQDS,and（4） citric acid ＋ AQDS.Results showed that DDT residues decreased by 78.93%-92.11% of the initial quantities after 20 days of incubation,and 1,1-dichloro-2,2-bis（4-chlorophenyl）-ethane（DDD） was the dominant metabolite.The application of citric acid accelerated DDT dechlorination slightly in the first 8 days,while the methanogenesis rate increased quickly,and then the acceleration effect improved after the 8th day while the methanogenesis rate decreased.The amendment by AQDS decreased the Eh value of the reaction system and accelerated microbial reduction of Fe（III） oxides to generate Fe（II）,which was an efficient electron donor,thus enhancing the reductive dechlorination rate of DDT.The addition of citric acid ＋ AQDS was most efficient in stimulating DDT dechlorination,but no significant interaction between citric acid and AQDS on DDT dechlorination was observed.The results will be of great significance for developing an efficient in situ remediation strategy for DDT-contaminated sites.

关键词： 1,1,1-Trichoro-2,2-bis（p-chlorophenyl）ethane （DDT） Anthraquinone-2,6-disulfonate （AQDS） Electron donor Reductive dechlorination Soil

Enhanced anaerobic degradation of hexachlorobenzene in a Hydragric Acrisol using humic acid and urea

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第1期31卷 172-179页

作者： Cuiying LIU jianling fan Xianghua xu Yu Wu Jamgsur Key Labonwory of Agric s/rurad Merorolog Schod of Appled Mee onog.Monjing Universiy of lfrmron Seiene and Technodog.Nonjing 210044China Key Labornaory of Soul Envirowment and Prlwriom Remediaton.Musimte of Sofl Sciemce Chinese Aecademy of ScencexNanjing 20008China Jimgsw Key Laboraory of Amospheric Enviromumenr Monioring and Pollariorn Comirod Jiangsu Collaborarive Iamovarion Cener of Amospherir Envirommenr and Equipmen TechnologySchool of Eavinmmental Sciemce md Engineering.Maning Uniersiny of Inpiormatienn Sciemce and Tecrmelogy.Nanjing 10044China

Humic substances acting as an electron shuttle and nitrogen transformation process influence remarkably the electron transfer in anaerobic reaction systems and thus may affect the reductive dechlorination of hexachlorobenzene(HCB). In order to develop an efficient agricultural strategy for the remediation of organochlorine-contaminated soils, a batch incubation experiment was conducted to study the effects of humic acid, urea, and their interaction on the reductive dechlorination of HCB in a Hydragric Acrisol with high iron oxide content. After 44 d of anaerobic incubation, the five treatments, sterile control,control, humic acid, urea, and humic acid + urea decreased HCB residues by 28.8%, 47.8%, 64.7%, 57.8%, and 71.3%, respectively. The amendment of humic acid or urea significantly decreased soil Eh values and accelerated Fe(Ⅲ) reduction to Fe(Ⅱ), thus promoting markedly reductive dechlorination of HCB. Humic acid had a larger dechlorination effect than urea. Since there was a synergistic interaction between humic acid and urea that accelerated HCB dechlorination, the treatment having both amendments together was the most efficient for HCB dechlorination. The results showed that the combination of NH4^(+)_(-)N supplied by a fertilizer and humic substance is a feasible strategy for the remediation of organochlorine-contaminated soils with abundant iron oxide.

关键词： electron-transfer mediator biological iron reduction persistent organic pollutant polychlorinated organic compound reductive dechlorination soil amendment soil remediation

Responses of soil microbial communities and functions associated with organic carbon mineralization to nitrogen addition in a Tibetan grassland

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2020年第2期30卷 214-225页

作者： Ruyi LUO Jiafa LUO jianling fan Deyan LIU Jin-Sheng HE Nazia PERVEEN Weixin DING State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 10049China AgResearch Limited Ruakura Research CentreHamilton 3240New Zealand Department of Ecology College of Urban and Environmental SciencesKey Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

Alpine grasslands with a high soil organic carbon(SOC)storage on the Tibetan Plateau are experiencing rapid climate warming and anthropogenic nitrogen(N)deposition;this is expected to substantially increase the soil N availability,which may impact carbon(C)cycling.However,little is known regarding how N enrichment influences soil microbial communities and functions relative to C cycling in this region.We conducted a 4-year field experiment on an alpine grassland to evaluate the effects of four different rates of N addition(0,25,50,and 100 kg N ha^-1 year^-1)on the abundance and community structure(phospholipid fatty acids,PLFAs)of microbes,enzyme activities,and community level physiological profiles(CLPP)in soil.We found that N addition increased the microbial biomass C(MBC)and N(MBN),along with an increased abundance of bacterial PLFAs,especially Gram-negative bacterial PLFAs,with a decreasing ratio of Gram-positive to Gram-negative bacteria.The N addition also stimulated the growth of fungi,especially arbuscular mycorrhizal fungi,reducing the ratio of fungi to bacteria.Microbial functional diversity and activity of enzymes involved in C cycling(β-1,4-glucosidase and phenol oxidase)and N cycling(β-1,4-N-acetyl-glucosaminidase and leucine aminopeptidase)increased after N addition,resulting in a loss of SOC.A meta-analysis showed that the soil C/N ratio was a key factor in the response of oxidase activity to N amendment,suggesting that the responses of soil microbial functions,which are linked to C turnover relative to N input,primarily depended upon the soil C/N ratio.Overall,our findings highlight that N addition has a positive influence on microbial communities and their associated functions,which may reduce soil C storage in alpine grasslands under global change scenarios.

关键词： alpine grassland C cycling C turnover community level physiological profiles(CLPP) enzyme activity microbial community composition microbial function N input

丛枝菌根真菌在提高植物抗逆性与土壤改良中的作用与机制研究进展

在线全文

学校读者我要写书评

暂无评论

中国粉体技术 2024年第2期30卷 164-172页

作者：杨沐郭寰段国珍王占林樊光辉李建领青海大学农牧学院青海西宁810016 青海大学农林科学院青海西宁810016 青海高原林木遗传育种实验室青海西宁810016

【目的】为深入了解植物抗逆性及土壤生态修复的机制,开展丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)在分子水平上的研究,以实现对植物生长发育及抗逆性和土壤生态改良的精准调控。【研究现状】综述AMF对宿主植物抗逆性和土壤生... 详细信息

【目的】为深入了解植物抗逆性及土壤生态修复的机制,开展丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)在分子水平上的研究,以实现对植物生长发育及抗逆性和土壤生态改良的精准调控。【研究现状】综述AMF对宿主植物抗逆性和土壤生态改良的影响,概括AMF抵御生物胁迫和非生物胁迫的作用机制,总结AMF在非侵染性病害、土壤生态结构改良等方面的作用机制和实际应用潜力。【展望】提出AMF在植物抗逆性提升与土壤生态结构改良方面的作用是生态学与农学研究的热点,继续研究AMF如何在分子层面影响植物的应激反应、免疫机制、与土壤微生物相互作用等方面的具体机制;AMF在不同植物种类、土壤类型和环境条件下的适用性也需要深入研究。未来的研究应更加侧重AMF与植物互作的分子机制,特别是AMF在基因调控和信号传导方面的作用;探索AMF在干旱、高盐、重金属污染等极端环境下的功能多样性和适应性;AMF作为一种新兴的有机菌肥,将有助于推动农业的可持续发展,为应对全球农业面临的挑战提供新的解决方案。

关键词：丛枝菌根真菌抗逆性土壤改良土壤团粒

在线全文

学校读者我要写书评

暂无评论

微服务软件架构设计模式及其应用

数字通信世界 2024年第1期 102-104页

作者：吴凡卞建玲宋振乾李庶衍焦文韬北京中电普华信息技术有限公司北京102200

文章从微服务架构的概念入手,分析微服务软件架构设计原则,探究微服务软件架构设计模式及其应用,旨在为开发人员和架构师提供有关微服务架构设计模式的全面知识,帮助他们更好地应用微服务架构模式开发高质量的软件应用。

关键词：微服务软件架构设计应用

新疆火烧云铅锌矿床地球化学特征及其地质意义

在线全文

学校读者我要写书评

暂无评论

大地构造与成矿学 2024年第3期48卷 654-675页

作者：任广利黄朝阳杨敏姚安强赵晓健张辉善万建岭范廷宾中国地质调查局西安地质调查中心/西北地质科技创新中心陕西西安710054 自然资源部岩浆作用成矿与找矿重点实验室陕西西安710054 重庆工程职业技术学院重庆402260 西安建筑科技大学资源工程学院陕西西安710055 新疆维吾尔自治区地质矿产勘查开发局第八地质大队新疆阿克苏843000

新疆喀喇昆仑萨岔口‒火烧云一带发现多处铅锌矿床(点),火烧云铅锌矿床以其超大型规模、独特的铅锌碳酸盐矿物组成,受到广泛关注。但是关于其成因存在较大分歧,主要原因是对该矿床铅锌矿物的矿物组构、铅锌硫化物与铅锌碳酸盐矿物之间的... 详细信息

新疆喀喇昆仑萨岔口‒火烧云一带发现多处铅锌矿床(点),火烧云铅锌矿床以其超大型规模、独特的铅锌碳酸盐矿物组成,受到广泛关注。但是关于其成因存在较大分歧,主要原因是对该矿床铅锌矿物的矿物组构、铅锌硫化物与铅锌碳酸盐矿物之间的演化关系、成矿物质来源的系统研究较为薄弱,制约了对其成因认识。本文从火烧云铅锌矿床的硫化物、碳酸盐矿物的组构特征入手,通过分析不同矿物的C-O-S-Pb同位素组成,认为其成矿物质来源具有壳源特征,推测来源于碳酸盐岩围岩。菱锌矿、方解石、石膏等具有多期成矿特征,晚期纹层状菱锌矿富含Fe、Mn、Cd等,不同期次菱锌矿中Zn、Cd同位素分馏明显,揭示了菱锌矿可能存在原地交代氧化和异地迁移再沉积就位等两种成因。EH4大地电磁测深表明该区深部具有稳定的层间破碎带,为成矿流体的迁移提供通道和就位空间。综上分析认为,火烧云铅锌矿床属MVT+次生氧化改造型。在河尾滩断裂以南马鞍山‒火烧云‒五峰山一带具有良好的成矿条件和找矿前景。

关键词：火烧云铅锌矿床矿物组构非硫化铅锌矿同位素地球化学喀喇昆仑新疆

柴达木盆地主要枸杞品种不同时期内含物变化研究

在线全文

学校读者我要写书评

暂无评论

青海农林科技 2024年第1期 1-6,25页

作者：肖子菲李建领龙启辰樊光辉王占林青海大学青海西宁810016 青海省农林科学院青海西宁810016 青海省高原林木遗传育种重点实验室青海西宁810016

为明确青海产区不同枸杞品种内含物合成规律及其差异,本研究以宁杞1号、5号、7号和青杞1号为试验材料,对青果期、黄果期和熟果期的枸杞果实总糖、多糖、黄酮、甜菜碱、氨基酸、类胡萝卜素、维生素C等内含物进行了测定,分析了果实内含物... 详细信息

为明确青海产区不同枸杞品种内含物合成规律及其差异,本研究以宁杞1号、5号、7号和青杞1号为试验材料,对青果期、黄果期和熟果期的枸杞果实总糖、多糖、黄酮、甜菜碱、氨基酸、类胡萝卜素、维生素C等内含物进行了测定,分析了果实内含物之间的相关性,结合主成分分析进行了果实品质综合评价。结果表明:枸杞中的总糖含量随着果实的发育逐渐增高,黄酮、氨基酸含量逐渐降低。类胡萝卜素、多糖呈现先上升后下降。维生素C含量青果期最低,随果实的发育有升有降。枸杞果实主成分分析结果显示,品质较好的是青杞1号,其次是宁杞5号。本研究明确了不同时期枸杞果实内含物的变化规律,为青海产区主要枸杞品种的综合开发利用提供参考。

关键词：枸杞果实内含物相关性主成分分析

骨质疏松症特殊人群的健康管理及综合治疗进展

在线全文

学校读者我要写书评

暂无评论

健康体检与管理 2024年第1期5卷 50-58页

作者：刘婷婷陈豪樊建玲刘晓玲陈萍郑骄阳海军军医大学第二附属医院健康管理中心上海200003

骨质疏松症患者中包含骨折术后、长期使用糖皮质激素,以及患有乳腺癌、前列腺癌、类风湿性关节炎等疾病的特殊人群。针对这些患者,治疗和健康管理方案与一般骨质疏松症患者有所不同,需要进行一定的改进和优化。同时,当患者合并其他严重... 详细信息

骨质疏松症患者中包含骨折术后、长期使用糖皮质激素,以及患有乳腺癌、前列腺癌、类风湿性关节炎等疾病的特殊人群。针对这些患者,治疗和健康管理方案与一般骨质疏松症患者有所不同,需要进行一定的改进和优化。同时,当患者合并其他严重疾病时,骨质疏松的治疗和随访监测往往被忽视,错过了最佳治疗时机。本文通过对不同种类的抗骨质疏松治疗方法和最新进展进行分析,分类综述骨质疏松特殊人群的治疗和健康管理方案,旨在为临床治疗提供更多参考。

关键词：骨质疏松症糖皮质激素乳腺癌前列腺癌健康管理

Significant strain-rate dependence of sensing behavior in TiO2@carbon fibre/PDMS composites for flexible strain sensors

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第6期10卷 1350-1359页

作者： fan ZHANG Hailong HU Simin HU jianling YUE School of Minerals Processing and Bioengineering Central South University School of Aeronautics & Astronautics Central South University Research Center in Intelligent Thermal Structures for Aerospace Central South University

Carbon fibre(CF) embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain gauge. To further improve the sensitivity of CF/PDMS composite strain sensor, the relatively low temperature prepared TiO2nanowire via hydrothermal route was employed herein to functionalize CF.The results showed a significant increase in the sensitivity of the TiO2@CF/PDMS composite strain sensors which was reflected by the calculated gauge factor. As the prepared TiO2nanowire vertically embraced the surroundings of the CF, the introduced TiO2nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain sensors. Moreover,the significant strain rate dependent behavior of TiO2@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain rate. Therefore, introducing TiO2nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.

关键词： composites dependence of strain rate sensitivity flexible strain sensors