检索结果-南通市图书馆

Pathogenesis and Immunogenicity of an Avian H9N2 Influenza Virus Isolated from Human

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

Biomedical and Environmental Sciences 2011年第5期24卷 530-536页

作者： LIU LiQi Li Zi ZHOU JianFang ZHU Yun dong jie zhao Xiang GUO JunFeng SHU YueLong State Key Laboratory for Molecular Virology and Genetic Engineering Chinese National Influenza CenterNational Institute for Viral Disease Control and PreventionChina CDCBeijing 102206China

Objective To investigate the pathogenesis and immunogenicity of H9N2 influenza virus A/Guangzhou/333/99 （a reassortant of G1 and G9 viruses isolated from a female patient in 1999） in a mouse model of *** Mice were infected with increasing virus *** load in the lungs and trachea was determined by EID50 *** histopathology was assessed by hematoxylin‐eosin ***‐HI antibody titers and T‐cell responses to viral HA were determined by ELISPOT and confirmed by flow *** Mice presented a mild syndrome after intranasal infection with A/Guangzhou/333/99 （H9N2） influenza *** was detected in the trachea and lungs of mice harvested on days 3,6,and 9 post‐infection.A T‐cell response to viral HA was detected on day 6 and H9 HA‐specific CD 4＋ T‐cells *** was detected after 14 days and antibody persisted for at least 28 *** Our results suggest that H9N2 （A/Guangzhou/333/99） can replicate in the murine respiratory tract without prior adaptation,and both humoral and cell‐mediated immunity play an important role in the immune response.

关键词： Avian influenza H9N2 Pathogenic characteristics Host immune responses

The calibration model in potassium ion flux non-invasive measurement of plants in vivo in situ

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2016年第2期3卷 76-82页

作者： Lin Xue dong-jie zhao Zi-yang Wang Xiao-dong Wang Cheng Wang Lan Huang Zhong-yi Wang College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China College of Information Technology Beijing Union UniversityBeijing 100101China Modern Precision Agriculture System Integration Research Key Laboratory of Ministry of Education Beijing 100083China Key Laboratory of Agricultural Information Acquisition Technology(Beijing) Ministry of AgricultureBeijing 100083China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China

SIET(Self-referencing Ion Electrode Technique)provides a novel electrophysiological tool which can non-invasively measure the dynamic influxes and effluxes of ions caused by the diffusion along the concentration gradients in ***,in this technique ion fluxes are converted to voltage signals using an ion selective microelectrode at a small amplitude of lV,which is easy to be interfered by the ambient ***,effective solutions to the suppression of noise and calibration of ion flux measurement system are very important for this method.A K^+-selective microelectrode was constructed using liquid ion exchangers(LIX)to investigate ion transport over plant tissue.A standard concentration gradient which simulates plant living cells was produced by an electrode with a certain tip diameter,filled with a solution containing a known K+concentration in 100 mmol/*** ion diffusion simulation model was *** model evaluated the performance of ion flux measurement system in accuracy and reliability by comparing the consistency of the measured value and the predicted curve.K^+fluxes were measured within 25 min at each measuring point of distance 10,20,30,40,50,80,and 100 lm from the K+source,*** can be seen that the K^+fluxes changes little,which indicates that ion flux measurement system has a reliable *** study provides a theoretical basis for a new non-invasive ion flux measurement method creation and a new sensors design.

关键词： SIET Plant K^+flux Calibration In situ

A low redox potential and long life organic anode material for sodium-ion batteries

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 Energy Chemistry 2025年第1期100卷 557-564页

作者： Zhi Li Yang Wei Kang Zhou Xin Huang Xing Zhou jie Xu Taoyi Kong Junwei Lucas Bao Xiaoli dong Yonggang Wang Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) Fudan University Department of Chemistry Boston College School of Materials Science and Engineering Anhui University of Technology

Sodium-ion batteries （SIBs） with organic electrodes are an emerging research direction due to the sustainability of organic materials based on elements like C,H,O,and sodium ***,organic electrode materials for SIBs are mainly used as cathodes because of their relatively high redox potentials（>1 V）.Organic electrodes with low redox potential that can be used as anode are ***,a novel organic anode material （tetrasodium 1,4,5,8-naphthalenetetracarboxylate,Na4TDC） has been developed with low redox potential （<0.7 V） and excellent cyclic *** three-sodium storage mechanism was demonstrated with various in-situ/ex-situ spectroscopy and theoretical calculations,showing a high capacity of 208 mAh/g and an average decay rate of merely 0.022%per ***,the Na4TDC-hard carbon composite can further acquire improved capacity and cycling stability for 1200 cycles even with a high mass loading of up to 20 mg *** pairing with a thick Na3V2（PO4）3cathode (20.6 mg cm-2),the as-fabricated full cell exhibited high operating voltage （2.8 V）,excellent rate performance and cycling stability with a high capacity retention of 88.7% after 200 cycles,well highlighting the Na4TDC anode material for SIBs.

关键词： Organic anode material Low redox potential Composite anode Sodium-ion batteries

STUDY ON THE MAGNITUDE OF THE NONLINEARITY PARAMETER B/A IN ORGANIC LIQUIDS

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 Science Bulletin 1988年第18期33卷 1511-1517页

作者：仝杰董彦武赵恒元 Institute of Applied Acoustics Shaanxi Teachers University Xi'an

Ⅰ. INTRODUCTION It was discovered that the nonlinearity parameters of biological media differed strikingly from each other according to their molecular structure. And so we can think that B/A will give some information of the molecular structure of a medium. But we know very little about the relation between them. Since the acoustic pro-

关键词： organie liquid acoustic nonlinearity parameter molar volume ultrasonic transducer

Storage time affects the level and diagnostic efficacy of plasma biomarkers for neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第8期20卷 2373-2381页

作者： Lifang zhao Mingkai Zhang Qimeng Li Xuemin Wang jie Lu Ying Han Yanning Cai Department of Clinical Biobank Xuanwu HospitalCapital Medical UniversityBeijingChina Beijing Geriatric Medical Research Center BeijingChina Department of Neurology Xuanwu HospitalCapital Medical UniversityBeijingChina Department of Radiology and Nuclear Medicine Xuanwu HospitalCapital Medical UniversityBeijingChina Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics BeijingChina Key Laboratory of Neurodegenerative diseases Ministry of EducationBeijingChina School of Biomedical Engineering Hainan UniversityHaikouHainan ProvinceChina Center of Alzheimer’s Disease Beijing Institute for Brain DisordersBeijingChina National Clinical Research Center for Geriatric Diseases BeijingChina Institute of Biomedical Engineering Shenzhen Bay LaboratoryGaoke Innovation CenterShenzhenGuangdong ProvinceChina Department of Neurobiology Xuanwu HospitalCapital Medical UniversityBeijingChina

Several promising plasma biomarker proteins,such as amyloid-β(Aβ),tau,neurofilament light chain,and glial fibrillary acidic protein,are widely used for the diagnosis of neurodegenerative ***,little is known about the long-term stability of these biomarker proteins in plasma samples stored at-80°*** aimed to explore how storage time would affect the diagnostic accuracy of these biomarkers using a large *** samples from 229 cognitively unimpaired individuals,encompassing healthy controls and those experiencing subjective cognitive decline,as well as 99 patients with cognitive impairment,comprising those with mild cognitive impairment and dementia,were acquired from the Sino Longitudinal Study on Cognitive Decline *** samples were stored at-80°C for up to 6 years before being used in this *** results showed that plasma levels of Aβ42,Aβ40,neurofilament light chain,and glial fibrillary acidic protein were not significantly correlated with sample storage ***,the level of total tau showed a negative correlation with sample storage ***,in individuals without cognitive impairment,plasma levels of total protein and tau phosphorylated protein threonine 181(p-tau181)also showed a negative correlation with sample storage *** was not observed in individuals with cognitive ***,we speculate that the diagnostic accuracy of plasma p-tau181 and the p-tau181 to total tau ratio may be influenced by sample storage ***,caution is advised when using these plasma biomarkers for the identification of neurodegenerative diseases,such as Alzheimer's ***,in cohort studies,it is important to consider the impact of storage time on the overall results.

关键词： Alzheimer’s disease amyloid-β diagnostic ability glial fibrillary acidic protein neurodegeneration neurofilament light chain plasma biomarkers single molecule array storage time tau

在线全文

学校读者我要写书评

暂无评论

平衡栽培体系中的产量保护因素——防病

土壤肥料 2005年第6期 I0001-I0004页

作者：曹恭梁鸣早董昭皆中国农业科学院土壤肥料研究所北京100081 山东荣成市土肥站荣成264300

六大产量形成因素直接影响作物产量的高低，而产量保护因素不能直接提高产量，而是避免已形成的作物产量遭受损失的因素。如果说产量形成因素是使产量加得多的问题，那么产量保护因素是使产量减得少的问题。它们是防病、治虫、除草，以... 详细信息

六大产量形成因素直接影响作物产量的高低，而产量保护因素不能直接提高产量，而是避免已形成的作物产量遭受损失的因素。如果说产量形成因素是使产量加得多的问题，那么产量保护因素是使产量减得少的问题。它们是防病、治虫、除草，以及包括耐寒、耐旱、耐盐和抗倒伏等方面的抗逆性问题。平衡栽培体系将产量保护因素与产量形成因素视为同等重要，二者不可偏废。[第一段]

关键词：平衡栽培体系作物产量保护防病产量形成因素高产量抗逆性抗倒伏治虫除草

Fault Diagnosis in LED Illuminating Circuits Based on Cloud Model

在线全文

学校读者我要写书评

暂无评论

Fault Diagnosis in LED Illuminating Circuits Based on Cloud ...

基于有价废品收购调查的农村生活垃圾管理机制初探:以广东省为例

2010亚洲光电子会议LED和显示技术分会场

作者： Qi Liu a,b,Hong-dong zhao a jie zhao b,a School of Information Engineering,Hebei University of Technology,Tianjin,China 300401 b Electronic & Information Engineering Department,Tianjin Institute of Urban Construction,Tianjin,China 300384

For gaining effective features to realize fault diagnosis in the LED illuminating circuits,a method of fault diagnosis in analog circuits based on cloud model is *** this paper,the analog circuit with a sinusoidal input is simulated and its output is sampled to extract sequences of each layer of wavelet coefficients as the initial fault feature ***,the backward cloud algorithm of cloud model is applied to obtain corresponding digital features of the wavelet coefficients,which include the Expected value E x,the Entropy E n and the Hyper entropy H e as new fault feature vectors,named fault cloud feature ***,Fault cloud feature vectors are used to BP neural networks to classify fault and realize the fault diagnosis in analog *** simulation result on the LED illuminating circuits shows that this method is feasible and has many powerful virtues,such as diagnosing and locating faults quickly and exactly.

关键词： LED fault diagnosis cloud model wavelet transform

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

生态与农村环境学报 2016年第6期32卷 946-950页

作者：曾超黄昌吉牛冬杰周萌赵由才同济大学污染控制与资源化研究国家重点实验室上海200092 广东省环境科学研究院广东广州510045

通过基于问卷的访谈式调研,深入广东省10个城市的91个村镇进行农村有价废品收购现状研究,以期为农村生活垃圾源头分类管理提供对策。调查结果表明,大部分村镇已实现生活垃圾统一清运,但无害化处理水平较低。废品收购从业群体组织规模小... 详细信息

通过基于问卷的访谈式调研,深入广东省10个城市的91个村镇进行农村有价废品收购现状研究,以期为农村生活垃圾源头分类管理提供对策。调查结果表明,大部分村镇已实现生活垃圾统一清运,但无害化处理水平较低。废品收购从业群体组织规模小,但超过70%的受访者具有5 a以上的从业时间,显示出良好的从业稳定性。基于行为学调查(收购方式、范围、工具和存储方式),总结了有价废品物质流的回收模式。由于有价废品价格和种类地域差异大,其价格持续走低和行业利润日趋微薄可能会对从业人员组成的稳定性和长期性造成冲击,进而降低农村垃圾的资源化率。设置3种特色方案研究有价废品收购人员参与农村垃圾分类收集工作的意愿,其满意比例分别为72.4%、56.3%和51.3%,今后应重点考虑突出有价废品收购从业人员的工作特色,予以适当的政策倾斜或经济补贴,提升其工作积极性。

关键词：农村生活垃圾有价废品垃圾分类管理广东

微生物和藻类分解对荣成天鹅湖沉积物氮磷释放的影响

在线全文

学校读者我要写书评

暂无评论

海洋环境科学 2019年第4期38卷 561-567页

作者：张文斌董昭皆徐书童高丽烟台大学海洋学院山东烟台264005 荣成市农业局山东荣成264300

以荣成天鹅湖的沉积物和硬毛藻为试材,模拟研究了不同微生物活性和藻类条件下上覆水体氮磷的含量变化,探讨了藻类分解和微生物活性对沉积物营养盐释放的影响。在无藻条件下,不同处理水体的总氮和总磷含量随时间的波动较大,分别变化在0.4... 详细信息

以荣成天鹅湖的沉积物和硬毛藻为试材,模拟研究了不同微生物活性和藻类条件下上覆水体氮磷的含量变化,探讨了藻类分解和微生物活性对沉积物营养盐释放的影响。在无藻条件下,不同处理水体的总氮和总磷含量随时间的波动较大,分别变化在0.42~11.71 mg/L和0.02~0.32 mg/L之间;中后期各微生物处理氮磷含量的顺序为氯化汞>葡萄糖、对照>甲醛。藻类分解条件下,水体的总氮和总磷含量远高于无藻条件,含量变幅分别为5.43~34.76 mg/L和0.28~1.80 mg/L;初期水体氮磷含量较高,之后随时间呈下降趋势。试验前期,有藻各处理总氮表现为氯化汞>葡萄糖>对照>甲醛,总磷为氯化汞>葡萄糖、甲醛>对照;后期各处理间差异减小。相同微生物活性下,有藻处理水体的氮磷含量均明显高于无藻条件。试验结束时,无藻组各处理沉积物的微生物活性均较低;而有藻条件下相对较高,各处理顺序为对照>葡萄糖、氯化汞>>甲醛。绿潮藻类分解条件下,微生物对天鹅湖沉积物的氮磷释放有着明显影响;微生物活性越强,沉积物氮磷的释放量越大。

关键词：微生物藻类分解沉积物氮磷释放