检索结果-南通市图书馆

Effects of destruxins on free calcium and hydrogen ions in insect hemocytes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2014年第1期21卷 31-38页

作者： Xiu-Run Chen Qiong-Bo Hu Xiao-Qiang Yu Shun-xiang ren College of Natural Resource and Environment South China Agricultural University Guangzhou China and Division of Cell Biology and Biophysics School of Biological Sciences University of Missouri - Kansas City Kansas City Missouri USA

Destruxins, cyclohexadepsipeptidic mycotoxins isolated from the ento mopathogenic fungus Metarhizium anisopliae, inhibit innate insect immunity. However, their mechanism of action remains unclear. In this study, the effects ofdestruxins on changes in free calcium and hydrogen ions in the hemocytes ofExolontha serrulata, Bombyx mori and the Spodoptera litura SL1 cell line were detected using laser scanning confocal mi croscopy （LSCM）. An instant Ca2＋ influx of hemocytes induced by destruxins A and B （DA and DB） was recorded. The DA/DBdependent Ca2＋ influx was not influenced by the Ca2＋ channel inhibitors 2aminoethoxydiphenyl borane （2APB） and U73122. It also had an apparently different LSCM profile from that of the ionomycindependent Ca2＋ influx. However, the instant Ca2＋ influx was not seen in the SL1 cells; on the contrary, a slow, moderate enhancement of intracellular Ca2＋ was observed. Meanwhile, an instant intracellular free H＋ decrease aroused by DA and DB was found. DB at 20/zmol/L and DA at 690/zmol/L significantly reduced intracellular free H＋ levels. Furthermore, the vacuolar H＋ATPase （VATPase） inhibitor bafilomycin A1 had obvious effects on the decreases ofintracellular free H＋ in hemocytes. These results suggest that the mechanism of DA/DBdependent Ca2＋ influx is perhaps not related to Ca2＋ channels and ionophores; rather, the intracellular free H＋ decrease might be due to VATPase inhibition.

关键词： calcium destruxin hemocytes hydrogen ions

Nitric Oxide Potentiates Oligosaccharide-induced Artemisinin Production in Artemisia annua Hairy Roots

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 Integrative Plant Biology 2008年第1期50卷 49-55页

作者： Li-Ping Zheng Yu-Ting Guo Jian-Wen Wang ren-xiang Tan Department of Horticultural Sciences Soochow University Suzhou 215006 China School of Pharmaceutical Sciences Soochow University Suzhou 215006 China Institute of Functional Biomolecules State Key Laboratory of Pharmaceutical Biotechnology Nanjing University Nanjing 210093 China

The purpose of the present study was to characterize the generation of nitric oxide （NO） in Artemisia annua roots induced by an oligosaccharide elicitor （OE） from Fusarium oxysporum mycelium and the potentiation role of NO in the elicitation of artemisinin accumulation. The OE （0.3 mg total sugar/mL） induced a rapid production of NO in cultures, which exhibited a biphasic time course, reaching the first plateau within 1.5 h and the second within 8 h of OE treatment. Artemisinin content in 20-day-old hairy roots was increased from 0.7mg/g dry wt to 1.3 mg/g dry wt by using the OE treatment for 4d. In the absence of OE, the NO donor sodium nitroprusside （SNP） at 10, 50 ~1 and 100 ~1 enhanced the growth of hairy roots, but had no effect on artemisinin synthesis, The combination of SNP with OE increased artemisinin content from 1.2 mg/g drywt to 2.2 mg/g dry wt, whereas the maximum production of artemisinin in cultures was 28.5 mg/L, a twofold increase over the OE treatment alone. The effects of SNP on the OE-induced artemisinin were suppressed strongly by the NO scavenger 2-（4- carboxyphenyl）-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide （cPTIO）. The results suggest that NO can strongly potentiate elicitor-induced artemisinin synthesis in A. annua hairy roots.

关键词： Artemisia annua artemisinin hairy roots nitric oxide oligosaccharide elicitor.

在线全文

学校读者我要写书评

暂无评论

工业电子雷管卡口部位防水性能研究

火工品 2025年第1期 27-31页

作者：张西亚葛立芳任晓祥樊保龙张安邦安徽江南化工股份有限公司安徽合肥230088 南京理工科技化工有限责任公司江苏南京211151

为了解决工业电子雷管在含水炮孔的短路、半爆问题,通过高压水罐对电子雷管进行了浸水试验,同时探究了卡印状态、卡口尺寸和雷管管壳厚度对电子雷管防水性能的影响。研究发现:卡口卡印处的褶皱是引起电子雷管进水的主要原因,进水后会出... 详细信息

为了解决工业电子雷管在含水炮孔的短路、半爆问题,通过高压水罐对电子雷管进行了浸水试验,同时探究了卡印状态、卡口尺寸和雷管管壳厚度对电子雷管防水性能的影响。研究发现:卡口卡印处的褶皱是引起电子雷管进水的主要原因,进水后会出现短路和半爆情况。在自动化产线对卡头瓣状直径进行了优化,消除了卡印褶皱,优化后的电子雷管产品防水性能良好,满足50 m水深、72 h的抗水性能要求;并且,当使用厚度为0.40 mm、卡口尺寸为5.60 mm的铁质管壳时,有助于提高卡口稳定性,同时减少了人工剔除不良品的安全隐患,有助于实现“人机隔离机器换人黑灯工厂”的安全生产模式。

关键词：工业电子雷管防水性能卡口工序短路半爆

同方期刊数据库

A study of laboratory testing and calculation methods for coal sorption isotherms

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2013年第2期19卷 193-202页

作者： Lei ZHANG Ting-xiang ren Nai AZIZ Faculty of Engineering University of Wollongong Wollongong 2500 Australia

Measurement of the volume of gas adsorbed per unit mass of coal with increasing pressure at a constant temperature produces an isotherm that describes the gas storage capacity of this type of coal. The accurate testing and interpretation of coal sorption isotherm plays an important role in the areas of coal mine methane drainage, coalbed methane （CBM） reservoir resource assessment, enhanced coalbed methane （ECBM） recovery, as well as the carbon dioxide （CO2） sequestration in deep coal seams or similar geological formations. Different coal sorption isotherm testing apparatus and associated calculation methods are critically reviewed and presented in this paper. These include both volumetric and gravimetric based methods, as well as experimental sorption tests with confining stress and direction sorption methods. The volumetric techniques utilise experimental apparatus with sample cell and injection pump and that with both sample cell and reference cell. Whilst the gravimetric approachesinclude methods with sample cell and suspension magnetic balance and that with both sample cell and reference cell. Different testing methods are compared and discussed in this study. A unique in-house-built coal sorption isotherm testing apparatus at the University of Wollongong was presented together with the calculation method, procedures and experimental results. The isotherm results can be calculated by both Soave-Redlich-Kwong （SRK） equation and calibration cure methods which can be used directly to convert the volume of adsorbed gas in different test conditions to standard condition （NTP）.

关键词： sorption isotherm coalbed methane coal mine gas apparatus calculation method volumetric method gravimetric method

Highly effective visible-photocatalytic hydrogen evolution and simultaneous organic pollutant degradation over an urchin-like oxygen-doped MoS_(2)/ZnIn_(2)S_(4)composite

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

Frontiers of Environmental Science & Engineering 2022年第10期16卷 77-89页

作者： Tao Yan Qianqian Yang Rui Feng xiang ren Yanxia Zhao Meng Sun Liangguo Yan Qin Wei School of Water Conservancy and Environment University of JinanJinan 250022China Key Laboratory of Interfacial Reaction&Sensing Analysis in Universities of Shandong School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China

Achieving hydrogen production and simultaneous decomposition of organic pollutants through dual-functional photocatalytic reactions has received increasing attention due to the environmentally friendly and cost-effective characteristics of this *** this work,an urchin-like oxygen-doped MoS_(2)/ZnIn_(2)S_(4)(OMS/ZIS)composite was fabricated for the first time using a simple solvothermal *** unique microstructure with abundant active sites and fast charge transfer channels further shortened the charge migration distance and compressed carrier *** obtained composite exhibited an efficient H2 evolution reaction rate of 12.8 mmol/g/h under visible light,which was nearly times higher than pristine ZnIn_(2)S_(4),and the apparent quantum efficiency was 14.9%(420 nm).The results of the simultaneous photocatalytic H2 evolution and organic pollutant decomposition test were satisfactory,resulting in decomposition efficiencies of resorcinol,tetracycline,and bisphenol A that reached 41.5%,63.5%,and 53.0%after 4 h,respectively,and the highest H2 evolution rate was 672.7 umol/g/h for bisphenol ***,natural organic matter(NOM)abundantly found in actual water was adopted as an electron donor for H production under simulated sunlight irradiation,indicating the promising practicability of simultaneous hydrogen evolution and NOM ***,the mechanisms of the dual-purpose photocatalytic reactions,as well as the synergistic effect between the molecular structures of the organic pollutants and the corresponding adsorption behavior on the photocatalyst surface were illustrated in *** obtained results may serve as an inspiration for the rational design of highly efficient,dual-functional photocatalysts in the future.

关键词： Dual-functional photocatalystsOxygen-doped MoS_(2)/ZnIn_(2)S_(4)evolutionOrganic pollutant

Dynamic network embedding via incremental skip-gram with negative sampling

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第10期63卷 89-107页

作者： Hao PENG Jianxin LI Hao YAN Qiran GONG Senzhang WANG Lin LIU Lihong WANG xiang ren Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University State Key Laboratory of Software Development Environment Beihang University Collage of Computer Science and Technology Nanjing University of Aeronautics and Astronautics National Computer Network Emergency Response Technical Team/Coordination Center of China Department of Computer Science University of Southern California

Network representation learning, as an approach to learn low dimensional representations of vertices, has attracted considerable research attention recently. It has been proven extremely useful in many machine learning tasks over large graph. Most existing methods focus on learning the structural representations of vertices in a static network, but cannot guarantee an accurate and efficient embedding in a dynamic network scenario. The fundamental problem of continuously capturing the dynamic properties in an efficient way for a dynamic network remains unsolved. To address this issue, we present an efficient incremental skip-gram algorithm with negative sampling for dynamic network embedding, and provide a set of theoretical analyses to characterize the performance guarantee. Specifically, we first partition a dynamic network into the updated, including addition/deletion of links and vertices, and the retained networks over time. Then we factorize the objective function of network embedding into the added, vanished and retained parts of the network. Next we provide a new stochastic gradient-based method, guided by the partitions of the network, to update the nodes and the parameter vectors. The proposed algorithm is proven to yield an objective function value with a bounded difference to that of the original objective function. The first order moment of the objective difference converges in order of O（1/n;）, and the second order moment of the objective difference can be stabilized in order of O（1）. Experimental results show that our proposal can significantly reduce the training time while preserving the comparable performance. We also demonstrate the correctness of the theoretical analysis and the practical usefulness of the dynamic network embedding. We perform extensive experiments on multiple real-world large network datasets over multi-label classification and link prediction tasks to evaluate the effectiveness and efficiency of the proposed framework, and up to

关键词： dynamic network embedding bound and convergence analysis multi-label classification link prediction

Visible light promoted difunctionalization reactions of alkynes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第7期40卷 1003-1019页

作者： xiang ren Zhan Lu Department of Chemistry Zhejiang UniversityHangzhou 310058ZhejiangChina

Visible light promoted difunctionalization of alkynes is reviewed. The difunctionalization reaction is achieved by different reagents. Radicals such as carbon(sp3), carbon(sp2), and other heteroatom(P, S, N, Se, O, and halide) radicals initiated by visible light can undergo radical addition to a carbon-carbon triple bond. Upon further transformation, the desired difunctionalized products are obtained. Some organometallic complexes can be activated by visible light;the difunctionalization of alkynes is catalyzed by these species. Other reagents like 1,3-dipole precursors could also react with alkynes to give difunctionalization products;here, the 1,3-dipole derivatives are obtained by visible light photocatalysis. So far, the strategy has been succeeded in the formation of C–C bonds and C–X bonds. Several valuable chemical skeletons have been constructed under mild conditions. However, high regio-and stereoselectivities in some direct difunctionalization methodologies are yet to be achieved.

关键词： Visible light photocatalysis Difunctionalization Cyclization Alkyne Redox catalyst

Epidemiological Characteristics of Measles-Mumps-Rubella in China’s Mainland during 2014-2021

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第11期37卷 1273-1282页

作者： Zhuowei Li Lele Deng Jiandong Li xiang ren Guangxue He National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China Division of Infectious Disease Key Laboratory of Surveillance and Early-Warning on Infectious DiseaseChinese Center for Disease Control and PreventionBeijing 102206China School of Public Health Binzhon Medical UniversityYantai 264000ShandongChina

Objective To analyze the epidemiological characteristics of measles,mumps,and rubella(MMR)between 2014 and 2021 and identify potential strategies and measures for the prevention and control of MMR in *** Data on MMR was obtained from China’s National Notifiable Disease Reporting System for the period from 2014 to *** distributions were analyzed using SaTScan;temporal trends were analyzed using JoinPoint;and clusters were visualized using *** A total of 1,808,067 cases of MMR were reported from 2014 to 2021 in China’s mainland,most of which were children and students under the age of *** incidence of measles declined during 2014-2021,whereas that of mumps and rubella peaked in ***-reported cases generally peaked from March to July;however,high numbers of mumps cases were reported from September to November in *** and rubella clusters predominantly occurred in Western China,whereas clusters of mumps were generally found in the southern *** The relatively heterogeneous epidemiological characteristics of MMR have highlighted the weaknesses and gaps in surveillance and timely control of MMR transmission in China’s ***-time and intelligent monitoring data should be collected for evidence-based early interventions。

关键词： Measles Mumps Rubella Epidemiological characteristics Spatiotemporal analysis

Multiple well-differentiated retroperitoneal liposarcomas with different patterns of appearance on computed tomography:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第7期9卷 1661-1667页

作者： Tian-Hao Xie xiang-xiang ren Yan Fu Si-Ning Ha Li-Tao Liu Xiao-Shi Jin Department of General Surgery Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina Department of Ophthalmology Baoding First Central HospitalBaoding 071000Hebei ProvinceChina

BACKGROUND Primary retroperitoneal liposarcoma(PRPLS)is a rare soft tissue tumor with nonspecific clinical symptoms;it has different computed tomography(CT)image features according to pathological *** patients with a single tumor have been previously reported in the *** present an exceptional case of a PRPLS patient with multiple large tumors exhibiting different patterns of appearance on CT and confirmed as atypical lipomatous tumor/welldifferentiated liposarcoma by postoperative *** SUMMARY A 64-year-old man presented with abdominal distension for 1 *** patient was diagnosed with PRPLS based on physical examination,laparotomy,ultrasonography,CT scan,and *** of the tumors were completely resected through surgery and confirmed as atypical lipomatous tumor/welldifferentiated liposarcoma by postoperative *** postoperative course was uneventful without recurrence or metastasis,as demonstrated by abdominalpelvic CT during an 18 mo *** Multiple large Well-differentiated liposarcomas with different patterns of appearance on CT image can occur simultaneously in the same patient,to which more attention should be paid to make an effective differential diagnosis.

关键词： Retroperitoneal liposarcoma Soft tissue tumor Complete resection Recurrence Case report