检索结果-南通市图书馆

Wing patterning genes of Nilaparvata lugens identification by transcriptome analysis, and their differential expression profile in wing pads between brachypterous and macropterous morphs

引用

Journal of Integrative Agriculture 2015年第9期14卷 1796-1807页

作者： LI Kai-yin HU Ding-bang LIU Fang-zhou LONG Man LIU si-yi ZHAO Jing HE Yue-ping HUA Hong-xia Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and TechnologyHuazhong Agricultural University

The brown planthopper, Nilaparvata lugens is an economically important pest on rice plants. This species produces macropterous and brachypterous morphs in response to environmental cues, which makes it very dififcult to control. The molecular basis of wing patterning in N. lugens is stil unknown. It is necessary to identify wing patterning genes of N. lugens, and also to clarify the expression differences of wing patterning genes between macropterous and brachypter-ous morphs. High-throughput deep sequencing of transcriptome of N. lugens wing pad yielded 116 744 580 raw reads and 113 042 700 clean reads. Al the reads were assembled into 55 963 unigenes with an average length of 804 bp. With the E-value cut-off of 1.0E–5,18 359 and 2 883 unigens had hits in NCBI-NR (NCBI non-redundant protein sequences) and NCBI-NT (NCBI nucleotide sequences) databases, respectively. A total of 16 502 unigenes were assigned to GO (gene ontology) classiifcation, 9 709 ungenes were grouped into 26 COG (cluster of orthologous groups of proteins) classiifcations, and 6 724 unigenes were assigned to different KEGG (Kyoto encyclopedia of genes and genomes) path-ways. In total, 56 unigenes which are homologous to wing patterning genes of Drosophila melanogaster or Tribolium castaneum were identiifed. Out of the 56 unigenes, 24 unigenes were selected, and their expression levels across the ifve nymphal stages between macropterous strain and brachypterous strain were examined by qRT-PCR. Two-way ANOVA analysis showed that development stage had signiifcant effects on the expression level of al the 24 genes (Psion levels of 8 genes (Nlen, Nlhh, Nlsal, NlAbd-A, Nlwg, Nlvg, Nlexd and NlUbx) were signiifcantly affected by wing morph. This is the ifrst transcriptome analysis of wing pads of hemimetabolous insect, N. lugens. The identiifed wing patterning genes would be useful resource for future exploration of molecular basis of wing development. The 8 differential y expressed win

关键词： Nilaparvata lugens wing pad transcriptome wing patterning genes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

用si’lnikov定理构造一个新的混沌系统

引用

计算机应用研究 2013年第10期30卷 3038-3040页

作者：邓奎彪禹思敏广东工业大学自动化学院广州510006

利用si’lnikov定理构造一个含有平方项的三维混沌系统,且系统有两个平衡点,有一个是鞍焦平衡点,构造的过程表明该混沌具有Smale马蹄(同宿轨混沌)。在满足同宿轨道si’lnikov定理条件下可以找出大量的参数值,使得系统处于混沌状态。数... 详细信息

利用si’lnikov定理构造一个含有平方项的三维混沌系统,且系统有两个平衡点,有一个是鞍焦平衡点,构造的过程表明该混沌具有Smale马蹄(同宿轨混沌)。在满足同宿轨道si’lnikov定理条件下可以找出大量的参数值,使得系统处于混沌状态。数值仿真验证了该方法的有效性。最后,用待定系数法找到系统中存在Smale马蹄,因而是si’lnikov意义下的混沌。

关键词：新的混沌系统同宿轨道 si’lnikov定理待定系数法斯梅尔马蹄

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Major Factors Affecting the Distribution of Anuran Communities in the Urban, Suburban and Rural Areas of Shanghai, China

引用

Asian Herpetological Research 2016年第4期7卷 287-294页

作者： Xiaoxiao SHU Wei ZHANG Ben LI Enle PEI Xiao yuan Tianhou WANG Zhenghuan WANG School of Life Science East China Normal University Shanghai 200062 China Shanghai Landscaping and City Appearance Administrative Bureau Shanghai 200040 China

There is a dearth of information on the effects of landscape and microhabitat variables on the distribution of anurans in areas of rapid urban development, in both tropical and subtropical regions. Therefore, we studied 24 Wetlands sites from the center of Shanghai city, China extending outward to rural areas. Sampling was performed from May through July 2014. Urbanization was categorized by the proportion of hard ground cover. Transect sampling and ＇calling＇ surveys were used to investigated the richness and density of anurans; microhabitat factors were recorded simultaneously. One-way analysis of variance and Kruskal-Wallis tests were conducted to analyze differences of total density, species richness and density of individual anuran species in the three urbanization levels; redundancy analysis was carried out on the relationship between anuran density and environmental variables. Species richness was lowest in the areas where the proportion of hard ground cover was 〉 80%, and the total density of anurans was highest in the areas where coverage of the hard ground cover was 〈 30%. We recorded five species belonging to four genera and four families and an individual anuran species that had varied representations in urban environments. Beijing gold-striped pond frogs （Pelophylax plancyi） and Zhoushan toads （Bufo gargarizans） appeared to be well adapted to the Shanghai metropolis. Large water environments and aquatic vegetation （floating-leaves and emergent vegetation） were indicators of the presence of Beijing gold-striped pond frogs. The density of black-spotted pond frog （Pelophylax nigromaculatus） was at the lowest density in the areas where hard ground coverage was 〉 80%, and tended to prefer larger bodies of water. Hong Kong rice-paddy frogs （Fejervarya multistriata） and ornamented pygmy frogs （Microhyla achatina） both suffered severely from cropland loss due to urban development. Bare land around breeding grounds was important for Hong Kong rice-paddy frogs, si

关键词： subtropical regions rapid urbanization amphibian habitat variable breeding seasons

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese clinical practice guidelines for acute infectious diarrhea in children

引用

World Journal of Pediatrics 2018年第5期14卷 429-436页

作者： Jie Chen Chao-Min Wan si-Tang G ong Feng F ang Mei Sun yuan Qian Ying Huang Bao-Xi Wang Chun-Di X u Li-Yan Ye Mei Dong Yu Jin Zhi-Hua Huang Qin-Bing Wu Chao-Min Zhu You-Hong F ang Qi-Rong Zhu Yong-Sui Dong Department of Gastroenterology Children’s HospitalZhejiang University School of MedicineHangzhou 310051China Department of Pediatrics West China Second HospitalSichuan UniversityChengdu 610041China Department of Gas troenterology Guangzhou Women and Children’s Medical CenterGuangzhou 510623China Department of Pediatrics Tongji Hospital Affiliated to Tongji Medical CollegeHuazhong University of Science and T echnologyWuhan 430030China Department of Gas troenterology Shengjing Hospital of China Medical UniversityShenyang 110004China Laboratory of Virology Beijing Key Laboratory of Etiology ofV iral Diseases inChildrenCapital Institute ofP ediatricsBeijing 100020China Department of Gas troenterology Children’s Hospital of Fudan UniversityShanghai 201102China Department of Inf ectious Diseases Children’s Hospital of Fudan UniversityShanghai 201102China Department ofP ediatrics Tangdu HospitalThe Fourth Military Medical UniversityXi’an 710038China Department of Pediatrics Ruijin HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 350025China Department of P ediatrics Fuzhou East HospitalFuzhou 350025China Department of P ediatrics Peking Union Medical College HospitalBeijing 100730China Department of Gas troenterology Children’s Hospital of N anjing Medical UniversityNanjing 210008China Department of Gas troenterology Children’s Hospital of Sooc how UniversitySuzhou 215003China Department of Inf ectious Diseases Children’s Hospital of Chongqing Medical UniversityChongqing 400014China

Background The guidelines addressed the evidence-based indications for the management of children with acute infectious diarrhea in Chinese pediatric population. Data sources The experts group of evidence development put forward clinical problems, collects evidence, forms prelimi-nary recommendations, and then uses open-ended discussions to form recommendations. The literature review was done for developing this guideline in databases including PubMed, Cochrane, EMBASE, China Biomedical Database, and Chinese Journal Full-text Database up to June 2013. Search the topic 'acute diarrhea' or 'enteritis' and 'adolescent' or 'child' or'Pediatric patient' or 'Baby' or 'Infant'. Results For the treatment of mild, moderate dehydration, hypotonic oral rehydration solutions (ORS) are strongly recom-mended. Intravenous (IV) rehydration is recommended for severe dehydration, with a mixture of alkali-containing dextrose sodium solution. Nasogastric feeding tube rehydration is used for children with severe dehydration without IV infusion conditions with ORS solution. Regular feeding should resume as soon as possible after oral rehydration or IV rehydration. The lactose-free diet can shorten the diarrhea duration. Zinc supplements are recommended in children with acute infectious diarrhea. Saccharomyces boulardii and Lactobacillus Rhamnus are recommended to be used in acute watery diarrhea. Sac-charomyces boulardii is recommended in children with antibiotic-associated diarrhea as well. Montmorillonite and Racec-adotril (acetorphan) can improve the symptoms of diarrhea or shorten the course of acute watery diarrhea. Antibiotics are recommended with dysenteric-like diarrhea, suspected cholera with severe dehydration, immunodeficiency, and premature delivery children with chronic underlying disease;otherwise, antibiotics are not recommended. Conclusion The principles of the most controversial treatments with of acute infectious disease are reaching to a consensus in China.

关键词： Children Diarrhea Dehydration Infection Rehydration Treatment Probiotics

来源：

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

基于气候生产潜力的云南人粮关系及其未来变化

引用

中国农业气象 2019年第2期40卷 96-104页

作者：李蒙朱勇周建琴马思源云南省气候中心昆明650034

基于云南117个气象站1961-2015年观测实况及全球气候模式模拟的2016-2055年年平均气温、降水量数据,使用ThornthwaiteMemorial模型计算并分析云南各地气候生产潜力(T_(spv))的时空变化特征,构建并计算T_(spv)的人口承载力(T_(spv)-人口... 详细信息

基于云南117个气象站1961-2015年观测实况及全球气候模式模拟的2016-2055年年平均气温、降水量数据,使用ThornthwaiteMemorial模型计算并分析云南各地气候生产潜力(T_(spv))的时空变化特征,构建并计算T_(spv)的人口承载力(T_(spv)-人口承载力)和气候承载力指数。结果表明:(1)云南T_(spv)呈现明显的纬向分布及垂直分布特征,总体表现为南部高于北部,低海拔地区高于高海拔地区,降水是云南T_(spv)主要限制因子;(2)1961-2015年全省T_(spv)仅滇西的部分地区显著增加,滇中局部等地显著减少,其余地区变化不显著,全省平均T_(spv)年际波动大,在2009年前后发生突变;(3)2006-2015年云南人均粮食供应稳定增长,接近或超过小康型粮食需求,耕地的人口承载力(耕地-人口承载力)逐年增加,但远低于T_(spv)-人口承载力,即使在极端减产年,T_(spv)-人口承载力水平仍能满足当前人口、耕地规模下富裕型粮食需求,人粮关系状态为盈余;(4)如果保持现有稳定的人口、耕地及生产力水平增幅,未来不同的排放情景下,云南T_(spv)及T_(spv)-人口承载力都将稳定增加,人粮关系状态以粮食盈余为主,且高排放情景下承载力和人粮关系状态水平均优于低排放情景。

关键词：云南气候生产潜力人口承载力气候承载力人粮关系气候变化预估

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

大宗商品期货价格极端波动风险与演化模式研究——基于供给侧结构性改革视角

引用

统计与信息论坛 2018年第11期33卷 78-89页

作者：郭文伟刘英迪袁媛张思敏广东财经大学金融学院广东广州510320

以综合类、工业类、能化类、金属类、贵金属类、农产品类等6种大宗商品期货为研究对象,通过结合极值理论(EVT)和条件风险自回归模型(CAViaR)构建CAViaR-EVT模型,对这些大宗商品期货价格的多头极端风险与空头极端风险(极端VaR)进行动态测... 详细信息

以综合类、工业类、能化类、金属类、贵金属类、农产品类等6种大宗商品期货为研究对象,通过结合极值理论(EVT)和条件风险自回归模型(CAViaR)构建CAViaR-EVT模型,对这些大宗商品期货价格的多头极端风险与空头极端风险(极端VaR)进行动态测度;基于严格的返回检测评价所构建模型的合理性,进而揭示其市场风险演化模式,研究结论表明:CAViaR-EVT模型在预测大宗商品期货价格极端风险时整体优于ARMA-GARCH族-EVT模型,且不同大宗商品期货价格市场风险演化模式存在显著差异,大部分商品期货市场风险具有自我增强趋势,且对外部利好利空消息的冲击响应呈现非对称性特征;供给侧结构性改革后工业类、金属类、农产品类大宗商品期货价格极端波动风险趋向增大,而贵金属类大宗商品期货则相反。

关键词：供给侧结构性改革大宗商品期货极端风险演化模式 CAViaR-EVT

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Semileptonic and nonleptonic decays of B_(u,d,s)^(*) in the covariant light-front approach

引用

Chinese Physics C 2024年第12期48卷 20-36页

作者： si-Yang Wang You-Ya Yang Zhi-Jie Sun Hao Yang Peng Li Zhi-Qing Zhang Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Institute of Theoretical Physics School of SciencesHenan University of TechnologyZhengzhou 450001China Institute for Complexity Science Henan University of TechnologyZhengzhou 450001China

The semileptonic and nonleptonic decays of the b-flavor vector mesons B_(u,d,s)^(*) and B_(c)^(*) are investigated within the covariant light-front quark model(CLFQM).By calculating the form factors of the transitions B_(u,d,s)^(*)→P under the CLFQM,with P denoting a pseudoscalar meson,i.e.,π,K,η_(c)(1S,2S),D_((s)),B_((s)),we predict and discuss several physical observables,including the branching ratios,polarization fractions f_(L),f_(∥),and forward-backward asymmetries A_(FB).The total widths of the single-photon radiative decay channels for these b-flavor vector mesons are estimated using their partial *** these considered decays,one can find that the semileptonic decays B_(s)_(*0)→D_(s)^(-)l′+ν_(l′)and B_(c)^(*+)→B_(s)^(0)l′+ν_(l′),η_(c)l′+ν_(l′),with l′being e orτ,and the nonleptonic channels B*+c→B0sπ+,B0sρ+have the largest branching ratios,which can reach up to the 10^(-7) order,and are most likely to be accessible at the future high-luminosity LHCb and Belle-II experiments.

关键词： b-flavor vector mesons B^(*) covariant light-front quark model branchig ratio

来源：

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

Changes in main causes of death in Macao residents from 1986-2006

引用

Chinese Medical Journal 2013年第9期126卷 1661-1666页

作者： CHAN Man-si CHEN Qing LAM Christopher Wai-kei Department of Epidemiology School of Public Health and Tropical Medicine Southern Medical University TongHe Guangzhou Guangdong 510515 China Faculty of Health Sciences Macao University of Science and Technology Taipa Macao SAR 999078 China

Background since Macao＇s return of sovereignty to China in December 1999, the life style of Macao residents has changed. The aim of this study was to investigate changes of death patterns in Macao residents from 1986 to 2006 in order to identify the trends and patterns of major public health problems, which could provide the guidance for developing public health policies. Methods A retrospective study was conducted for this investigation. Research data were collected from official websites and statistical yearbooks and classified by the International Classification of Diseases （ICD）-9. Results It was observed that mortality from the three major causes of （1） infectious, maternal and childhood diseases, （2） chronic non-communicable diseases, and （3） injury and poisoning were 17.7, 298.2 and 26.0 per 100 000, respectively. The largest decrease in death rate over the 21-year study-period was from infectious, maternal and childhood diseases （62.5%）. The highest mortality rate was ischemic heart diseases （37.0%）. The largest increase in mortality rate was lung cancer （46.9%）. Conclusions Mortality rate of Macao residents progressively decreased, but the constituent ratio of death from chronic non-communicable diseases was increasing. The mortality rate of lung cancer was clearly ascending, so emphasis should be Dut on tertiarv prevention in future.

关键词： death patterns epidemiology macao residents mortality rate

来源：

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

Liver cancer incidence and mortality in China, 2009

引用

Chinese Journal of Cancer 2013年第4期32卷 162-169页

作者： Wan-Qing Chen Rong-Shou Zheng si-Wei Zhang National Office for Cancer Prevention and Control &National Cancer Center

Liver cancer is a common cancer and a leading cause of cancer deaths in China. To aid the government in establishing a control plan for this disease, we provided real-time surveillance information by analyzing liver cancer incidence and mortality in China in 2009 reported by the National Central Cancer Registry. Liver cancer incidence and cases of death were retrieved from the national database using the ICD-10 topography code "C22". Crude incidence and mortality were calculated and stratified by sex, age, and location (urban/rural). China's population in 1982 and Segi (world) population structures were used for age-standardized rates. In cancer registration areas in 2009, the crude incidence of liver cancer was 28.71/100,000, making it the fourth most common cancer in China, third most common in males, and fifth most common in females. The crude mortality of liver cancer was 26.04/100,000, making it the second leading cause of cancer death in China and urban areas and the third leading cause in rural areas. Incidence and mortality were higher in males than in females and were higher in rural areas than in urban areas. The age-specific incidence and mortality were relatively low among age groups under 30 years but dramatically increased and peaked in the 80 -84 years old group. These findings confirm that liver cancer is a common and fatal cancer in China. Primary and secondary prevention such as health education, hepatitis B virus vaccination, and early detection should be carried out both in males and females, in urban and rural areas.

关键词： Liver cancer, cancer registry, incidence, mortality, China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Newly discovered insect RNA viruses in China

引用

Science China(Life Sciences) 2013年第8期56卷 711-714页

作者： QIU Yang WANG ZhaoWei LIU YongXiang QI Nan si Jie XIANG Xue XIA XiaoLing HU yuanYang ZHOU Xi State Key Laboratory of Virology College of Life SciencesWuhan University

Insects are a group of arthropods and the largest group of animals on Earth,with over one million species described to *** other life forms,insects suffer from viruses that cause disease and *** that are pathogenic to beneficial insects cause dramatic economic losses on *** contrast,viruses that are pathogenic to insect pests can be exploited as attractive biological control *** of these factors have led to an explosion in the amount of research into insect viruses in recent years,generating impressive quantities of information on the molecular and cellular biology of these *** to the wide variety of insect viruses,a better understanding of these viruses will expand our overall knowledge of their ***,we review studies of several newly discovered RNA insect viruses in China.

关键词： insect virus Wuhan Nodavirus Dendrolimus punctatus tetravirus Ectropis obliqua picorna-like virus

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：