检索结果-南通市图书馆

Electrokinetic movement of multiple chlorobenzenes in contaminated soils in the presence of β-cyclodextrin

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 2007年第8期19卷 968-976页

作者： YUAN Song-hu wan Jin-zhong LU Xiao-hua School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China.

This study investigated the electrokinetic （EK） behavior of multiple chlorobenzenes, including 1,2,3,4-tetrachlorobenzene （TeCB）, 1,2,4,5-tetrachlorobenzene （i-TeCB）, and 1,2,3-trichlorobenzene （TCB） in contaminated clayed soils. The effect of β-cyclodextrin （β- CD） on the EK removal of the chlorobenzenes was studied. The largest removal was obtained when Na2CO3/NaHCO3 buffer was used as anodic purging solution without β-CD. The removal efficiencies were related to the aqueous solubilities of chlorobenzenes. With the same cumulative electroosmotic flow, greater solubility led to higher removal efficiency. The addition of β-CD inhibited the EK removal efficiency of all chlorobenzenes. The inhibition increased with the increase of β-CD concentration. With the same β-CD concentration, the inhibition increased with the rise of electric potential. It was found that the inclusion compounds between β-CD and chlorobenzenzes were less soluble than chlorobenzenes. The formation of the less soluble inclusion compounds reduced the aqueous solubility of chlorobenzenes and led to the partial immobilization of the chlorobenzenes that desorbed from soil. It was feasible to use the EK technology to remove chlorobenzenes in contaminated soils using water as the anodic flushing solution. The addition of β-CD was not recommended for the EK removal of chlorobenzenes.

关键词： chlorobenzenes electrokinetic soil remediation β-cyclodextrin (β-CD)

A maximum power point tracker for photovoltaic energy systems based on fuzzy neural networks

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第2期10卷 263-270页

作者： Chun-hua LI Xin-jian Zhu Guang-yi CAO wan-qi hu Sheng SUI Ming-ruo hu Fuel Cell Research Institute Shanghai Jiao Tong University Shanghai 200240. China Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

To extract the maximum power from a photovoltaic （PV） energy system, the real-time maximum power point （MPP） of the PV array must be tracked closely. The non-linear and time-variant characteristics of the PV array and the non-linear and non-minimum phase characteristics of a boost converter make it difficult to track the MPP for traditional control strategies. We propose a fuzzy neural network controller （FNNC）, which combines the reasoning capability of fuzzy logical systems and the learning capability of neural networks, to track the MPP. With a derived learning algorithm, the parameters of the FNNC are updated adaptively. A gradient estimator based on a radial basis function neural network is developed to provide the reference information to the FNNC. Simulation results show that the proposed control algorithm provides much better tracking performance compared with the filzzy logic control algorithm.

关键词： Photovoltaic array Maximum power point tracking (MPPT) Fuzzy neural network controller (FNNC) Radial basis function neural network (RBFNN)

Identification of Colletotrichum spp. isolated from strawberry in Zhejiang Province and Shanghai City,China

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第1期11卷 61-70页

作者： Liu XIE Jing-ze ZHANG Yao wan Dong-wei hu Key Laboratory of Molecular Biology of Crop Pathogens and lnsects Ministry of Agriculture Institute of Bioteehnology College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China

Strawberry anthracnose, caused by Colletotrichum spp., is a major disease of cultivated strawberry. This study identifies 31 isolates of Colletotrichum spp. which cause strawberry anthracnose in Zhejiang Province and Shanghai City, China. Eleven isolates were identified as C. acutatum, 10 as C. gloeosporioides and 10 as C. fragariae based on morphological characteristics, phylogenetic and sequence analyses. Species-specific polymerase chain reaction （PCR） and enzyme digestion further confirmed the identification of the Colletotrichum spp., demonstrating that these three species are currently the causal agents of strawberry anthracnose in the studied regions. Based on analysis of rDNA internal transcribed spacers （ITS） sequences, sequences of all C. acutatum were identical, and little genetic variability was observed between C. fragariae and C. gloeosporioides. However, the conservative nature of the Mvnl specific site from isolates of C. gloeosporioides was confirmed, and this site could be used to differentiate C. gloeosporioides from C. fragariae.

关键词： Fragariaxananassa Taxonomic identification Colletotrichum acutatum C. gloeosporioides C. fragariae

A V-shaped spectroscopic cell for FTIR measurements

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第4期22卷 481-484页

作者： Xiang Qin Lin Zhi Xiang Zhang wan Qun hu Department of Chemistry University of Science and Technology of China Hefei 230026 China

A V-shaped spacroscopic cell（V-cell） was constructed using two CaF2 optical plates for FTIR light transparent measurements in the range of 4000-1000 cm^（-1）.The spectrum of ethanol was characterized with the standard spectra,excellent fitting was achieved with a bottom-width correction *** principle of the V-cell was discussed,giving equations for the data *** shows that the V-cell is an auto-focus type spectroscopic cell,which can effectively avoid absorption saturation with amplifications for weak absorption *** V-cell design is simple and effective,easy to operate,suitable for applications in liquid samples with high absorption bands,willing to have broad application prospects.

关键词： V-shaped cell FTIR spectroscopy Light transparent Error correction Demountable Ethanol

Novel hybrids from N-hydroxyarylamide and indole ring through click chemistry as histone deacetylase inhibitors with potent antitumor activities

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第6期26卷 675-680页

作者： Mao Cai Jie hu Ji-Lai Tian huang Yan Chen-Guo Zheng wan-Le hu Department of Coloproctology The Second Affiliated Hospital of Wenzhou Medical University Department of Pharmacy Wenzhou Medical University Jiangsu Key Laboratory for Biomaterials and Devices School of Biological Science and Medical EngineeringSoutheast University

Novel hybrid molecules 8a-8o were designed and synthesized by connecting indole ring with N- hydroxyarylamide through alkyl substituted triazole, and their in vitro biological activities were evaluated. It was discovered that most of target compounds showed promising anticancer activities, particularly for 8n, which had a significant HDACs inhibitory and antiproliferative activities comparable to or slightly stronger than SAHA against human carcinoma cells. Furthermore, compound 8n exhibited much better selectivity for HDAC1 over HDAC6 and HDAC8 than SAHA. In addition, compound 8n also could dose-dependently induce cancer cell cycling arrest at G0/G1 phase and promote the expression of the acetylation for histone H3 and tubulin in vitro. Therefore, our novel findings may provide a new framework for the design of new selective HDAC inhibitor for the treatment of cancer.

关键词： Synthesis Anti-tumor agents Histone deacetylase inhibitors N-Hydroxyarylamides Click chemistry

Reducing Synchronization Cost for Single-Level Store in Mobile Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2016年第4期31卷 836-848页

作者： Yuan-Chao Xu hu wan Ke-Ni Qiu Tao Li Wei-Gong Zhang College of Information Engineering Capital Normal University Beijing 100048 China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Electrical and Computer Engineering University of Florida Gainesville FL 32611 U.S.A.

Emerging byte-addressable non-volatile memory technologies, such as phase change memory （PCM） and spin- transfer torque RAM （STT-RAM）, offer both the byte-addressability of memory and the durability of storage, thus making it feasible to build single-level store systems. To ensure the consistency of persistent data structures in the presence of power failures or system crashes, it requires flushing cache lines to persistent memory frequently, thus incurring non-trivial synchronization overhead. To mitigate this issue, we propose two techniques. First, we use non-volatile STT-RAM as scratchpad memory on chip to store recovery information, thereby eliminating synchronization cost in the logging phase due to the avoidance of off-chip logging operations. Second, we present an adaptive synchronization policy based on caching modes in terms of data access patterns, thereby eliminating unnecessary synchronization cost in the checkpoint phase. Evaluation results indicate that the two techniques improve the overall performance from 2.15x to 2.39x compared with conventional transactional persistent memory.

关键词： crash consistency synchronization cost persistent memory power failure mobile system

Current susceptibilities of brown planthopper Nilaparvata lugens to triflumezopyrim and other frequently used insecticides in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2021年第1期28卷 115-126页

作者： Xun Liao Peng-Fei Xu Pei-Pan Gong hu wan Jian-Hong Li nstitute of Crop Protection Guizhou UniversityGuiyangChina hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhanChina

The brown planthopper is a notorious rice pest in many areas of *** evolution of insecticide resistance in Nilaparvata lugens has become a serious problem in the effective control of this pest in the paddy *** this article,the current susceptibility of *** field populations to novel mesoionic insecticide triflumezopyrim and major classes of chemical insecticides was determined and *** monitoring results indicated that field populations of *** had developed low resistance to triflumezopyrim(resistance ratio,RR:1.3-7.3-fold)during 2015-2018 in China,and the median lethal concentration values varied from 0.05 to 0.29 mg/***,during 2017 to 2018,field populations of *** showed high resistance levels to thiamethoxam(RR:456.1-1025.6-fold),imidacloprid(RR:2195.3-6899.0-fold)and buprofezin(RR:1241.57521.7-fold),moderate to high resistance levels to dinotefuran(RR:97.6-320.1-fold),clothianidin(RR:69.4-230.1-fold)and isoprocarb(RR:44.1-108.0-fold),and low to moderate levels of resistance to chlorpyrifos(RR:12.0-29.7-fold)and nitenpyram(RR:6.9-24.1-fold).In contrast,*** just showed low resistance to sulfoxaflor(RR:3.3-8.5-fold)and etofenprox(RR:5.0-9.1-fold)in the ***,the P450 gene CYP6ER1 was found to be significantly overexpressed in all five field populations of *** collected in 2018 when compared with a laboratory susceptible *** findings will provide useful information to delay the evolution of insecticide resistance in ***.

关键词： Nilaparvata lugens(Stal) P450 gene susceptibility triflumezopyrim

Wolbachia enhances expression of NICYP4CE1 in Nilaparvata lugens in response to imidacloprid stress

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2021年第2期28卷 355-362页

作者： Tingwei Cai Yunhua Zhang Yu Liu Xiaoqian Deng Shun He Jianhong Li hu wan hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhanChina

The brown planthopper,Nilaparvata lugens,is one of the main insect pests of *** *** gene NICYP4CE1 encodes cytochrome P450 monooxygenase(P450),which is a key enzyme in the metabolism of the insecticide *** research has suggested that the expression of NICYP4CEI is induced by imidacloprid stress,but the effect of bacterial symbionts on its expression has not been *** results of this study show that exposure to subtoxic imidacloprid changed the structure of the bacterial symbiont community in ***,the total bacterial content increased but the bacterial species diversity significantly *** accounted for the largest proportion of bacteria in ***;its abundance significantly increased after subtoxic imidacloprid *** transcript level of NICYP4CEI was significantly increased by imidacloprid,but this effect was significantly weakened after Wolbachia was cleared with *** result suggests that Wolbachia enhances the expression of N1CYP4CE1 to promote the detoxification metabolic response to imidacloprid *** the effect of bacterial symbionts on gene expression in the host provides a new perspective on interactions between insecticides and their target insect pests,and highlights that subtoxic imidacloprid exposure may raise the risk of insecticide resistance by altering the structure of bacterial symbiont communities.

关键词： host-microbe interaction imidacloprid NICYP4CE1 P450 Wolbachia

Phylogeography of Haplocarpha rueppelii(Asteraceae) suggests a potential geographic barrier for plant dispersal and gene flow in East Africa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2015年第13期60卷 1184-1192页

作者： Ling-Yun Chen John K.Muchuku Xue Yan Guang-wan hu Qing-Feng wang Sino-Africa Joint Research Center Chinese Academy of Sciences Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden Chinese Academy of Sciences University of Chinese Academy of Sciences

East Africa is a biodiversity hotspot. Haplocarpha rueppelii （***.） Beauverd is mainly distributed in the alpine grassland of East Africa. Here we sampled 65 individuals of eight populations/locations of H. rueppelii including hairy and glabrous forms from Mts. Elgon, Aberdare, Kenya, Kilimanjaro and Bale Mountains. We then sequenced one nuclear and three chloroplast DNA fragments and conducted phylogeographic analyses to test the taxonomic rank of the two forms and causes for the differentiation （intrinsic reproductive isolation and geographic barrier）. The results demonstrate that the species consists of two major groups, one includes the populations from Mts. Elgon, Aberdare and Bale, while the other includes Mts. Kenya and Kilimanjaro. The species has established in Mts. Kenya and Aberdare during the Pleistocene. However, migration rate for individuals between the two mountains was low as showed by gene flow analysis. A barrier for plant dispersal and gene flow would have existed between Mts. Aberdare and Kenya since at least Pleistocene. No change of the taxonomic concept of this species is needed. This study reveals a potential geographic barrier in East Africa. We hope it will arouse more scientists＇ interests in phylogeography and biodiversity of East Africa.

关键词： East Africa . Afro-alpine . Gene flow .Phylogeography . Taxonomy . Haplocarpha rueppelii