检索结果-南通市图书馆

维普期刊数据库

Effects of Aphidius gifuensis on the feeding behavior and potato virus Y transmission ability of Myzus persicae

在线全文

学校读者我要写书评

暂无评论

Insect Science 2018年第6期25卷 1025-1034页

作者： Ying-Qin He Yong-Qiang Zhang juan-Ni Chen wen-Long Chen Xian-Yi Zeng Hai-Tao Chen Wei Ding College of Plant Protection Southwest UniversityChongqingChina Guizhou Key Laboratory of Plant Disease and Pest Management for Mountain Agriculture Institute of EntomologyGuizhou UniversityGuiyangChina Chongqing Institute of Tobacco Science ChongqingChina

The stylet penetration behavior of aphids when feeding on plants is associated with virus acquisition and *** gifuensis (Ashmead)is a primary endoparasitoid of Myzuspersicae (Sulzer)which is the most efficient vector of plant viruses. Information about the effects ofparasitoid on aphid and virus transmission can provide an essential foundation for designing effective biological control *** study aimed to investigate the effects *** on the feeding behavior and potato virus Y (PVY) transmission ability of *** results showed that after *** was para-sitized by ***,the duration of the first probe significantly ***, *** exerted remarkable effects on aphid feeding in phloem *** contribution of the E1 waveform to the phloem phase was significantly higher in all parasitized aphids than in the control *** the time of infestation increased for parasitized aphids,the total duration of phloem sap ingestion ***,the percentage of time *** spent in the xylem and phloem phases only changed significantly on day *** percent transmission of PVY by the aphids parasitized on day 5 was lower than that in the control,but no significant differences were *** significance of this work is the demonstration that *** can impede the feeding behavior of ***,which sheds light on the biological basis *** as a natural enemy, but unfortunately does not provide an immediate solution for disrupting the transmission of PVY.

关键词： Braconidae electrical penetration graphs feedingbehavior Myzuspersicae parasitoids virus transmission

Risk Factors Associated with the Spatiotemporal Spread of the SARS-CoV-2 Omicron BA.2 Variant—Shanghai Municipality,China,2022

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2023年第5期5卷 97-102,I0001-I0005页

作者： wen Zheng Xiaowei Deng Cheng Peng Xuemei Yan Nan Zheng Zhiyuan Chen juan Yang Marco Ajelli juanjuan Zhang Hongjie Yu School of Public Health Fudan UniversityKey Laboratory of Public Health SafetyMinistry of EducationShanghai MunicipalityChina Laboratory for Computational Epidemiology and Public Health Department of Epidemiology and BiostatisticsIndiana University School of Public HealthBloomingtonINUSA Shanghai Institute of Infectious Disease and Biosecurity Fudan UniversityShanghai MunicipalityChina

Summary What is already known about this topic?Previous studies have explored the spatial transmission patterns of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and have assessed the associated risk ***,none of these studies have quantitatively described the spatiotemporal transmission patterns and risk factors for Omicron BA.2 at the micro(within-city)scale.

关键词： acute assessed respiratory

基于PERK/eIF2α/ATF4/CHOP诱导的肺泡上皮细胞凋亡探讨人参皂苷Rg1减轻脓毒症急性肺损伤的作用和机制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国中药杂志 2024年第14期49卷 3837-3847页

作者：仲凯强黄荫桂陈秀萍陈瑞邬楚雯邹佳桢奚小土李俊闫春江广州中医药大学第二临床医学院广东广州510405 广州中医药大学第二附属医院广东广州510120 广东药科大学生命科学与生物制药学院广东广州510006 广东省中医急诊研究重点实验室广东广州510006 广州中医药大学第一附属医院广东广州510405

探讨人参皂苷Rg1(GRg1)对脓毒症急性肺损伤(SALI)的干预疗效与作用机制。采用盲肠结扎穿孔术(CLP)建立SALI小鼠模型,随机分组给予GRg1干预,记录存活与体质量变化情况,小鼠无创肺功能检测系统检测肺功能,苏木精-伊红(HE)染色观察肺组织... 详细信息

探讨人参皂苷Rg1(GRg1)对脓毒症急性肺损伤(SALI)的干预疗效与作用机制。采用盲肠结扎穿孔术(CLP)建立SALI小鼠模型,随机分组给予GRg1干预,记录存活与体质量变化情况,小鼠无创肺功能检测系统检测肺功能,苏木精-伊红(HE)染色观察肺组织损伤情况,酶联免疫吸附实验(ELISA)、实时荧光定量PCR(qRT-PCR)检测炎症因子含量与表达,流式细胞术、TUNEL染色等检测凋亡情况,蛋白质印迹(Western blot)、qRT-PCR检测凋亡相关分子胱天蛋白酶3(caspase-3)、B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)与内质网应激相关分子蛋白激酶R样内质网激酶(PERK)、真核翻译起始因子2α激酶(eIF2α)、活化转录因子4(ATF4)、C/EBP同源蛋白(CHOP)的活化表达情况。此外,利用脂多糖(LPS)体外诱导小鼠肺泡上皮细胞损伤模型,给予内质网应激激动剂衣霉素(TUN)验证GRg1的作用机制。结果显示,与模型组相比,GRg1干预可提高CLP小鼠生存时间,减缓其体质量下降,改善其受损的肺功能指标。同时,与模型组相比,GRg1给药组小鼠肺组织病理损伤评分降低,肺组织湿干比和肺泡灌洗液蛋白含量降低,血清白细胞介素-6(IL-6)、白细胞介素-1β(IL-1β)、肿瘤坏死因子-α(TNF-α)水平及肺组织中上述细胞因子的mRNA表达下降,肺泡上皮细胞凋亡比例明显下降,caspase-3、Bax表达下调,Bcl-2表达上调,PERK、eIF2α、ATF4、CHOP活化及表达下调。体外结果显示联合TUN后,GRg1降低凋亡细胞比例、下调凋亡相关蛋白表达的作用被抑制。综上,GRg1可减少肺泡上皮细胞凋亡,抑制肺部炎症渗出,减轻肺损伤,改善肺功能,可能与PERK/eIF2α/ATF4/CHOP通路相关。

关键词：脓毒症人参皂苷Rg1 急性肺损伤内质网应激细胞凋亡

维普期刊数据库

Gold self-relay catalysis for accessing functionalized cyclopentenones bearing an allcarbon quaternary stereocenter

在线全文

学校读者我要写书评

暂无评论

Organic Chemistry Frontiers 2022年第1期9卷 140-146页

作者： Fan-Tao Meng Jing-Long Chen Xiao-Yan Qin Tian-Shu Zhang Shu-Jiang Tu Bo Jiang wen-juan Hao School of Chemistry&Materials Science Jiangsu Normal UniversityXuzhou221116P.R.China School of Materials and Chemical Engineering Xuzhou University of TechnologyXuzhou 221018P.R.China

A new gold(I)self-relay catalysis consisting of a 3,3-rearrangement,Nazarov cyclization and Michael addition cascade of 1,3-enyne acetates with aurones and their derived azadienes is reported,and used to produce a series of densely functionalized cyclopentenones bearing a cyclic quaternary stereocenter in moderate to good yields under mild *** tandem protocol demonstrates high regioselectivity,broad substrate flexibility and good functional group tolerance of substrates without inert atmosphere protection,providing a catalytic and convergent approach for creating all-carbon stereoscopic centers.

关键词： catalysis quaternary functional

Association between serum vitamin D and severity of liver fibrosis in chronic hepatitis C patients: a systematic meta-analysis

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 Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第10期15卷 900-906页

作者： Yue-qiu LUO Xiao-xing wu Zong-xin LING Yi-wen CHENG Li YUAN Charlie XIANG State Key Laboratory for Diagnosis and Treatment of Infectious Disease the First Affiliated Hospital School of MedicineZhejiang University Department of Biochemistry and Molecular Biology School of Medicine Zhejiang University Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases Zhejiang University

To conduct a systematic review of group studies assessing the association of serum vitamin D status with the severity of liver fibrosis in chronic hepatitis C patients using meta-analysis. The relevant research literatures were identified by searching PubMed and EMBASE databases prior to October 2013 with no restrictions. We included group studies that reported odds ratio（OR） estimates with 95% confidence intervals（CIs） or a mean with standard deviation（SD） for the association between serum vitamin D status and the severity of liver fibrosis in chronic hepatitis C patients. Approximately 8321 participants from several countries were included in this analysis. Six studies on serum vitamin D status and the severity of liver fibrosis were included in this meta-analysis. ORs with 95% CIs were extracted from four studies and the pooled ORs were 0.866（95% CI, 0.649 to 1.157）. The means with SDs were extracted from three studies and the pooled means were-0.487（95% CI,-0.659 to-0.315）. There was statistically significant heterogeneity among the mean data extracted studies（P=0.029; I^2=71.8%） but not among the OR data extracted studies（P=0.061; I^2=55.6%）. Finally, results from the mean data extracted studies suggest that lower serum vitamin D is a risk factor for the severity of liver fibrosis in chronic hepatitis C patients. However, there is no conclusive evidence on this association because of inconsistencies between the OR data extracted studies and the mean data extracted studies.

关键词： Vitamin D Fibrosis Hepatitis C virus Meta-analysis

维普期刊数据库

Plant phenols contents and their changes with nitrogen availability in peatlands of northeastern China

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2020年第6期13卷 713-721页

作者： Di wu Xian-Wei Wang Shi-Qi Xu Chong-juan Chen Rong Mao Xue-Yan Liu School of Earth System Science Tianjin UniversityTianjin 300072China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102JilinChina College of Forestry Jiangxi Agricultural UniversityNanchang 330045JiangxiChina

Aims Climate warming and increasing nitrogen(N)deposition have influenced plant nutrient status and thus plant carbon(C)fixation and vegetation composition in boreal ***,which are secondary metabolites in plants for defense and adaptation,also play important roles in regulating peatland C dynamics due to their anti-decomposition ***,how the phenolic levels of different functional types of plants vary depending on nutrient availability remain unclear in boreal *** Here,we investigated total phenols contents(TPC)and total tannins contents in leaves of 11 plant species in 18 peatlands of the Great Hing’an Mountains area in northeastern China,and examined their variations with leaf N and phosphorus(P)and underlying *** Findings Shrubs had higher TPC than graminoids,indicating less C allocation to defense and less uptake of organic N in faster-growing and nonmycorrhizal graminoids than in slower-growing and mycorrhizal *** shrubs,leaf TPC decreased with increasing N contents but was not influenced by changing leaf phosphorus(P)contents,which suggested that shrubs would reduce the C investment for defense with increasing N ***,leaf TPC of graminoids increased with leaf N contents and decreased with leaf P *** graminoids are more N-limited and less P-limited,we inferred that graminoids would increase the defensive C investment under increased nutrient *** concluded that shrubs would invest more C in growth than in defense with increasing N availability,but it was just opposite for graminoids,which might be an important mechanism to explain the resource competition and encroachment of shrubs in boreal peatlands in the context of climate warming and ever-increasing N deposition.

关键词： boreal peatlands plant phenols plant defense theory plant functional types nitrogen availability

Effect of surgery on delayed inhaled foreign body： a case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第8期124卷 1264-1266页

作者： XUE Lei PAN Tie-wen ZHAO Xue-wei wu Bin XU Zhi-fei ZHONG Lei Department of Cardio thoracic Surgery Second Affiliated HospitalSecond Military Medical University Shanghai 200003 China

The occurrence of foreign body is uncommon in youths and adults. We report here a case of 16-year-old boy who inhaled a foreign body which was overlooked for 6 months. The patient suffered productive cough and received antibiotic treatment for 10 days. But the symptoms did not improve. Chest radiography and CT scan revealed a 1-cm-long needle-like foreign object in the right inferior lobar bronchus. Wedge resection of lung was finally performed because of severe hemorrhage caused by prior bronchoscopy.

关键词： foreign body flexible bronchoscopy wedge resection of lung

The In-Flight Realtime Trigger and Localization Software of GECAM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第10期 13-26页

作者： Xiao-Yun Zhao Shao-Lin Xiong Xiang-Yang wen Xin-Qiao Li Ce Cai Shuo Xiao Qi Luo wen-Xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-Yuan Liao Yan-Qiu Zhang Yue Huang Lu Li Xing wen Fei Zhang Jing Duan Chen-Wei Wang Dong-Li Shi Peng Zhang Qi-Bin Yi Chao-Yang Li Yan-Bing Xu Xiao-Hua Liang Ya-Qing Liu Da-Li Zhang Xi-Lei Sun Fan Zhang Gang Chen Huan-Yu Wang Sheng Yang Xiao-Jing Liu Min Gao Mao-Shun Li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong Liu Xing-Bo Han Jin-Ling Qi Jia Huang Ke-Ke Zhang Can Chen Xiong-Tao Yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang Ma Xiao-Bo Li Ping Wang Xin-Ying Song Li-Ming Song Shi-Jie Zheng Bing Li Hong-Mei Zhang Yue Zhu Wei Chen Jian-Jian He Zhen Zhang Jin Hou Hong-Jun Wang Yan-Chao Hao Xiang-Yu Wang Zong-Yuan Yang Zhi-Long wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan Yan-Guo Li Gang Li Xu-Fang Li Fang-Jun Lu Hong Lu Bin Meng Feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei Yang Xue-juan Yang Shuang-Nan Zhang Chao-Yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Chinese Academy of Sciences School of Information Science and Technology Southwest Jiaotong University Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan University Physics and Space Science College China West Normal University Department of Astronomy Beijing Normal University Innovation Academy for Microsatellites of CAS Changchun University of Science and Technology Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS

Realtime trigger and localization of bursts are the key functions of GECAM, an all-sky gamma-ray monitor launched on 2020 December 10. We developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic Box. This onboard software has the following features: high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation, dedicated localization algorithm optimized for both short and long bursts, and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation system. This paper provides a detailed description of the design and development of the trigger and localization software system for GECAM. It covers the general design, workflow, the main functions, and the algorithms used in the system. The paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube, as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

贺兰山西坡不同海拔梯度土壤氨基糖积累特征

生态学报 2024年第7期44卷 2907-2918页

作者：赵娅茹吴梦瑶袁丽丽王晓勤杨娟陈林李学斌周金星万龙庞丹波宁夏大学生态环境学院西北土地退化与生态恢复国家重点实验室培育基地西北退化生态系统恢复与重建教育部重点实验室宁夏贺兰山森林生态系统国家定位观测研究站银川750021 宁夏大学林业与草业学院银川750021 北京林业大学水土保持学院云南建水荒漠生态系统国家定位观测研究站北京林业大学水土保持国家林业和草原局重点实验室北京100083 内蒙古贺兰山国家级自然保护区管理局阿拉善左旗750306

为探明旱区山地不同海拔梯度土壤氨基糖积累特征,明确氨基糖对土壤有机碳库的贡献以及影响因素。以2021年8月在贺兰山西坡不同海拔(1848—2940 m)采集的土壤为研究对象,分析土壤理化性质、微生物群落结构、氨基糖含量、氨基糖对土壤有... 详细信息

为探明旱区山地不同海拔梯度土壤氨基糖积累特征,明确氨基糖对土壤有机碳库的贡献以及影响因素。以2021年8月在贺兰山西坡不同海拔(1848—2940 m)采集的土壤为研究对象,分析土壤理化性质、微生物群落结构、氨基糖含量、氨基糖对土壤有机碳贡献变化特征以及引起该变化的驱动因素。结果表明:沿海拔梯度上升,土壤理化性质表现出显著差异,土壤含水率、有机碳、全氮表现为升高趋势,pH和容重表现为降低趋势,全磷无明显变化规律。沿海拔梯度上升,土壤真菌、细菌、放线菌以及丛枝菌根真菌磷脂脂肪酸(Phospholipid fatty acids, PLFAs)含量表现为先增加后减少的趋势,在中海拔区域(2110—2360 m)微生物PLFAs含量更高。沿海拔梯度上升,总氨基糖含量和氨基糖单体(氨基葡萄糖、氨基半乳糖、胞壁酸和氨基甘露糖)分别表现为持续增加和先减少后增加的变化趋势,并且总氨基糖和氨基糖单体含量均在最高海拔达到峰值,中海拔区域真菌和细菌残体碳对土壤有机碳的贡献率均小于高海拔(2707—2940 m)和低海拔(1848—1910 m),且在不同海拔梯度上真菌残体碳对土壤有机碳贡献率占据主导地位。方差分解结果显示,土壤理化性质和微生物PLFAs含量共同解释了土壤氨基糖含量及对有机碳贡献率的55.2%,其中土壤理化性质解释变异的52.9%,微生物PLFAs含量解释变异的26.9%,冗余分析同步验证土壤理化性质是影响氨基糖及氨基糖对土壤有机碳贡献率的主要因素。本研究结果揭示了贺兰山西坡微生物驱动土壤有机碳存储与转化机制,可为进一步研究旱区山地微生物残体对土壤有机碳的贡献提供理论依据。

关键词：海拔梯度微生物群落土壤有机碳氨基糖贺兰山

维普期刊数据库博看期刊