检索结果-南通市图书馆

减氮对麦玉轮作农田土壤反硝化细菌群落结构和多样性的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

农业环境科学学报 2024年第6期43卷 1338-1349页

作者：白芳芳乔冬梅李平杜臻杰陆红飞郭魏齐学斌中国农业科学院农田灌溉研究所河南新乡453002 农业农村部农产品质量安全水环境因子风险评估实验室河南新乡453002 中国农业科学院河南新乡农业水土环境野外科学观测试验站河南新乡453002 江苏农林职业技术学院江苏句容212400

探究减氮对华北地区麦玉轮作农田土壤反硝化细菌群落结构和多样性影响,为华北地区麦玉轮作农田氮肥管理提供技术支持,本研究以不施氮为对照(CK),设置2个施氮量,分别为常规施氮量(纯氮300 kg·hm^(-2),N2)、减氮20%(纯氮240 kg·hm^(-2),... 详细信息

探究减氮对华北地区麦玉轮作农田土壤反硝化细菌群落结构和多样性影响,为华北地区麦玉轮作农田氮肥管理提供技术支持,本研究以不施氮为对照(CK),设置2个施氮量,分别为常规施氮量(纯氮300 kg·hm^(-2),N2)、减氮20%(纯氮240 kg·hm^(-2),N1),提取土壤DNA,用nirS(细胞色素cd1-亚硝酸还原酶)、nirK(Cu-亚硝酸还原酶)引物扩增后采用MiSeq PE300测序技术,研究施氮量对麦玉轮作农田土壤性状及nirS、nirK反硝化细菌群落结构及多样性的影响。结果表明,3个处理nirS、nirK反硝化细菌α-多样性指数无显著差异,nirS反硝化细菌α-多样性高于nirK。减氮显著影响nirS、nirK反硝化细菌物种组成。减氮对nirS、nirK反硝化细菌门水平及nirK纲水平物种组成无显著影响,但显著降低了nirS反硝化细菌Deltaproteobacteria(δ-变形菌纲)相对丰度;减氮显著影响nirS、nirK属水平物种组成。硝态氮、速效磷、pH值是影响土壤nirS反硝化细菌属水平群落结构主要环境因子;pH值是影响土壤nirK反硝化细菌属水平群落结构的主要环境因子。研究表明,适量减氮不影响反硝化细菌α-多样性,但显著影响反硝化细菌属水平群落组成和群落结构,减氮主要是通过影响土壤性状及微生物群落结构进而影响农田土壤N2O排放。

关键词：减氮 nirK nirS 反硝化细菌麦玉轮作多样性群落结构

MnO_(2)-coated nanodiamond-driven photodynamic therapy for enhanced antitumor effect by addressing hypoxia and glutathione depletion

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第9期92卷 305-315页

作者： Jicheng Cui dongmei Zhang Hui qiao Zeyu Yan Wenxia Zhang Yingqi Li Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular ScienceShanxi UniversityTaiyuan030006China Taiyuan Central Hospital Taiyuan030009China School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan030006China

The generation of reactive oxygen species(ROS)at the tumor site to induce destruction is emerging as a novel strategy for cancer treatment,which involves photodynamic therapy(PDT).Nevertheless,tumors typically create a hypoxic environment and are equipped with an endogenous antioxidant defense system that could potentially impede the efficiency of the therapeutic *** overcome these drawbacks,herein,a tumor microenvironment-responsive the ND-PAA-CD-Ce6@MnO_(2)(NPCC@M)delivery system was fabricated by disulfide bond coupling chlorin e6(Ce6)to nanodiamond(ND)and further wrapped by MnO_(2)nanosheets to facilitate *** use of disulfide bond not only stabilizes Ce6 in the blood circulation to prevent premature leakage,but also destroys the antioxidant barrier of overexpressed glutathione(GSH)in tumor ***,the outer MnO_(2)was rapidly degraded by the endogenous hydrogen peroxide(H_(2)O_(2))in the acidic pH and GSH within the tumor cells,which leads to an abundance of O_(2)and while increases the level of 1O_(2)under laser *** results eventually broke the redox homeostasis and attenuate hypoxia,thereby inducing apoptosis and necrosis of tumor *** in vitro and in vivo biological effect has revealed a good biosafety profile and a high tumor suppression *** a novel ND-based system with tumor microenvironment-modulating capability to elevate oxygen content and promote GSH consumption in tumor cells opens new opportunities for enhanced ROS treatment paradigms.

关键词： Nanodiamond Photodynamic Chlorin e6 MnO_(2) Tumor suppression

Effects of Bacillus subtilis and Saccharomyces cerevisiae inoculation on soil bacterial community and rice yield under combined irrigation with reclaimed and fresh water

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

International Journal of Agricultural and Biological Engineering 2022年第3期15卷 33-46页

作者： Hongfei Lu Xuebin Qi Ping Li dongmei qiao Shafeeq-ur-Rahman Fangfang Bai Jiaxin Cui Farmland Irrigation Research Institute Chinese Academy of Agricultural SciencesXinxiang 453003HenanChina Water Environment Factor Risk Assessment Laboratory of Agricultural Products Quality and Safety Ministry of Agriculture and Rural AffairsXinxiang 453002HenanChina Agricultural Water Soil Environmental Field Research Station of Xinxiang Chinese Academy of Agricultural SciencesXinxiang 453002HenanChina Jiangsu Vocational College of Agriculture and Forestry Jurong 212499JiangsuChina

In order to save fresh water and reduce soil salt accumulation,reclaimed water-fresh water combined irrigation,i.e,irrigation with reclaimed water for 50 d and then with fresh water till harvest,was used in rice *** subtilis and Saccharomyces cerevisiae were inoculated into the soil at the end of reclaimed water *** inoculation weight per pot of these microorganisms was as follows:0 g and 0 g(J0),5 g and 0 g(J1),3.75 g and 1.25 g(J2),2.5 g and 2.5 g(J3),1.25 g and 3.75 g(J4),and 0 g and 5 g(J5),*** using reclaimed water in the whole stage was used as the control(CK).The plant height,tiller,physical and chemical properties of the soil,and soil bacterial diversity were *** was found that the plant height of rice was increased significantly by J1-J5 *** dry weight of rice root,stem,and panicle and the 1000-grain weight increased significantly,while the leaf dry weight *** inoculation significantly increased the nutrient absorption capacity of the crops.J1,J2,and J4 treatments significantly increased the amount of nitrate-nitrogen,ammonium nitrogen,available phosphorus,and available potassium,while J3,J4,and J5 treatments increased the soil organic matter,and microbial inoculation significantly decreased the EC of soil.J4 treatment induced the largest reduction in EC,and microorganisms treatments increased soil *** function prediction based on the KEGG(Kyoto Encyclopedia of Genes and Genomes)pathway indicated that soil metabolic function was not significantly disturbed by the *** matter and pH are the two main factors affecting the structure of the bacterial community in soil.3.75 g of *** and 1.25 g of *** per pot is the best inoculation ratio.

关键词： Bacillus subtilis Saccharomyces cerevisiae rice reclaimed water soil

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

e印本文库创建过程研究

情报理论与实践 2006年第2期29卷 232-235页

作者：乔冬梅清华大学科技与社会研究所北京100084

e印本文库(e-print archive)是开放存取(Open Access)运动推荐的一种非正式科学交流系统。本文对“e-print archive”的中文翻译方法、基本内涵、工作原理、基本类型等问题做了简单介绍;分析了e印本文库创建的基本步骤,并重点探讨建设... 详细信息

e印本文库(e-print archive)是开放存取(Open Access)运动推荐的一种非正式科学交流系统。本文对“e-print archive”的中文翻译方法、基本内涵、工作原理、基本类型等问题做了简单介绍;分析了e印本文库创建的基本步骤,并重点探讨建设政策制定、e印本传播系统选择与配置、e印本文库网站设计等问题。

关键词： Web 信息交流/e印本文库科学交流非正式交流开放存取

在线全文

学校读者我要写书评

暂无评论

我国e印本文库的发展策略

图书情报工作 2006年第1期50卷 59-63页

作者：乔冬梅清华大学科学技术与社会研究所北京100084

在介绍e印本文库(“e-print archive”)的基本问题,包括中文翻译、基本内涵、工作原理和类型的基础上,回顾其发展历程和国内外发展现状;借鉴国外e印本文库发展的实践经验,提出发展我国e印本文库的基本策略和宏观管理模式。

关键词： e印本文库科学交流非正式交流开放存取发展策略宏观管理模式

基于《开放文库计划》(OAI)的引文数据库开发研究

在线全文

学校读者我要写书评

暂无评论

现代图书情报技术 2005年第12期 39-43页

作者：乔冬梅清华大学科技与社会研究所北京100084

《开放文库计划》(OAI)是基于元数据采集的网络数据库系统互操作协议,因其采用了低进入障碍的技术方案,简单易行,因而被很多网络数据库和信息增值服务项目所采用。本文介绍了OAI的技术框架,并分析了基于OAI开发带有自动链接功能的引文... 详细信息

《开放文库计划》(OAI)是基于元数据采集的网络数据库系统互操作协议,因其采用了低进入障碍的技术方案,简单易行,因而被很多网络数据库和信息增值服务项目所采用。本文介绍了OAI的技术框架,并分析了基于OAI开发带有自动链接功能的引文数据库的原理及实例。

关键词：《开放文库计划》引文数据库信息增值服务

e印本文库(e-print archive)研究——介绍一种非正式科学交流系统

在线全文

学校读者我要写书评

暂无评论

图书情报知识 2006年第1期23卷 66-69页

作者：乔冬梅清华大学科学技术与社会研究所北京100084

“e-print archive”是开放存取(Open Access)运动推荐的一种非正式科学交流系统,本文系统研究了“e-print archive”的中文翻译、学术交流理念、基本功能、学术交流过程、主要特点和基本类型等问题。

关键词： e印本文库非正式科学交流开放存取

Effect of Water Resources Allocation on Groundwater Environment and Soil Salinity Accumulation under Climate Change

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science and Engineering 2016年第2期6卷 73-82页

作者： Li Ping Qi Xuebin Magzum Nurolla Huang Zhongdong Liang Zhijie qiao dongmei Chinese Academy of Agricultural Sciences Farmland Irrigation Research Institute Xinxiang Henan 453002 China Xi 'an University of Technology Institute of Water Resources and Hydro-electric Engineering Xi 'an Shanxi 710048 China Chinese Academy of Agricultural Sciences Agriculture Water and Soil Environmental Field Science Research Station of XinxiangCity Henan Province Xinxiang Henan 453002 China Chinese Academy of Agricultural Sciences Key laboratory of High-Efficient and Safe Utilization of Agriculture Water ResourcesXinxiang Henan 453002 China

The combined surface and groundwater allocation practice by wells and canals had contributed to the safety of groundwater environment and agriculture sustainable production. The typical area in the People＇s Victory Canal irrigation district was taken as a case, drawing together the irrigation district agriculture water consumption and precipitation from 1954 to 2014 in the People＇s Victory Canal irrigation district, ratios of surface to groundwater irrigation amount, dynamic of groundwater depth and hydrochemical characteristic of groundwater from 2008 to 2014 in the research area, the relationship between groundwater depth and ratio of surface to groundwater irrigation amount was analyzed, in order to ascertain the influence of precipitation on ratios of surface to groundwater irrigation amount and its effect on soil and groundwater environment. The results indicated that positive correlation between the ratios of surface to groundwater irrigation amount and annual precipitation was appeared, affected by climate change, average irrigation amount from surface in the recent 5 years was 2.90 x 108 cubic meters, accounted for 75.52% of total irrigation amount, on the other hand, decreasing tendency of precipitation was obvious, and groundwater depth dynamic in upstream of the branch canals was more dramatic than downstream because of surface water irrigation infiltration, under the unified condition of water use efficiency, ratio of surface to groundwater irrigation amount was negative correlation with area of the groundwater depth beyond 11 m, meanwhile, groundwater depth demonstrated negative correlation with the ratio of surface to groundwater irrigation amount, moreover, alkaline trend of groundwater hydrochemistry during the normal season in the research area was obvious because of phreatic evaporation and the agricultural irrigation from wells, along with irrigation from surface inflow of Yellow River, quality of groundwater hydrochemistry during the dry season w

关键词： Well-canal combined irrigation district irrigation patterns ratio of surface to groundwater irrigation amount hydrochemical characteristic.

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

国外电子出版物研究与发展综述

中国图书馆学报 2005年第4期31卷 72-77页

作者：李丹乔冬梅山西忻州师范学院武汉大学信息管理学院

通过对国外电子出版物类型、发展轨迹、面临问题以及典藏管理的研究得出结论:我国要加强对网络出版的开发和应用;要引进国外的出版设备和软件,发展新的出版模式;出版社要增强网络销售能力;要建立相应的出版管理制度,等等。参考文献10。

关键词：电子出版物出版模式出版物类型发展状况