检索结果-南通市图书馆

Effect of vegetation on soil bacteria and their potential functions for ecological restoration in the Hulun Buir Sandy Land,China

引用

Journal of Arid Land 2020年第3期12卷 473-494页

作者： yan ru FENG Wei yanchi Research Station School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China Engineering Research Center of Forestry Ecological Engineering of the Ministry of Education Beijing Forestry UniversityBeijing 100083China

To date,much of research on revegetation has focused on soil microorganisms due to their contributions in the formation of soil and soil remediation ***,little is known about the soil bacteria and their functions respond to the diverse vegetational types in the process of vegetation *** of dominated vegetation,i.e.,Artemisia halodendron Turcz Ex Bess,Caragana microphylla Lam.,Hedysarum fruticosum *** Pinus sylvestris *** bacterial community structures and their potential functions in the Hulun Buir Sandy Land,China were determined using high-throughput 16S rRNA gene sequencing and phylogenetic investigation of communities by reconstruction of unobserved states(PICruSt)in *** the dominant phyla of soil bacterial community among different types of vegetation,including Proteobacteria,Actinobacteria,Acidobacteria,Bacteroidetes and Firmicutes,were similar,the relative abundance of these dominant groups significantly differed,indicating that different types of vegetation might result in variations in the composition of soil bacterial *** addition,functional genes of bacterial populations were similar among different types of vegetation,whereas its relative abundance was significantly *** carbon fixation genes showed a high relative abundance in ***,*** carbon decomposition genes in ***,suggesting the variations in carbon cycling potential of different types of *** of assimilatory nitrate reduction genes was the highest in ***,*** nitrate reduction and nitrate reductase genes in ***,indicating higher nitrogen gasification loss and lower nitrogen utilization gene functions in *** structures and functional genes of soil bacterial community showed marked sensitivities to different plant species,presenting the potentials for regulating soil carbon and nitrogen cycling.

关键词： bacterial taxonomic composition functional gene vegetational type soil carbon and nitrogen 16S rRNA

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

内皮细胞特异性骨形态发生蛋白2对血管新生的影响:生物信息学分析和实验验证

引用

中国组织工程研究 2025年第1期29卷 103-110页

作者：燕茹王凯茹张飞燕贾绍斌丛广志宁夏医科大学总医院心内科宁夏回族自治区银川市750004 宁夏医科大学总医院医学研究院宁夏回族自治区银川市750004 宁夏医科大学总医院心血管病研究所宁夏回族自治区银川市750004

背景:血管新生是心血管疾病的主要干预靶点,骨形态发生蛋白2具有调控血管新生作用,但内皮细胞特异性骨形态发生蛋白2对血管新生的调控作用不清楚。目的:探讨内皮细胞特异性骨形态发生蛋白2对血管新生的影响。方法:(1)生物信息学分析:通... 详细信息

背景:血管新生是心血管疾病的主要干预靶点,骨形态发生蛋白2具有调控血管新生作用,但内皮细胞特异性骨形态发生蛋白2对血管新生的调控作用不清楚。目的:探讨内皮细胞特异性骨形态发生蛋白2对血管新生的影响。方法:(1)生物信息学分析:通过Panglao DB公共基因表达数据库单细胞转录组荟萃分析观察骨形态发生蛋白2细胞群表达丰度和定位。血管新生小鼠和内皮(心内膜)过表达骨形态发生蛋白2小鼠转录组测序数据集探索内皮细胞骨形态发生蛋白2对血管新生信号通路的调控作用。(2)体内实验验证:建立小鼠后肢缺血模型,对比模型小鼠患侧与健侧缺血后肢7,14和21 d血流灌注情况,免疫荧光和免疫组织化学染色评估小鼠骨形态发生蛋白2和CD31的表达定位情况。(3)体外实验验证:体外培养人脐静脉内皮细胞,分为对照组、缺氧组和骨形态发生蛋白2抑制剂(Noggin蛋白)干预组,培养24 h,观察各组内皮细胞血管新生情况。结果与结论:(1)内皮细胞是表达骨形态发生蛋白2的重要细胞亚群,在血管新生内皮细胞和骨形态发生蛋白2过表达内皮细胞转录组再分析均发现骨形态发生蛋白2表达明显升高,血管新生通路明显激活。(2)缺血7 d小鼠新生血管周围骨形态发生蛋白2阳性血管明显增加(P<0.05),缺血2周骨形态发生蛋白2阳性血管明显减少(P<0.001)。(3)体外培养人脐静脉内皮细胞,缺氧干预后,内皮细胞迁移能力和血管出芽明显增加,血管新生因子血管内皮生长因子和血小板衍生生长因子的表达明显升高,Noggin明显减少了缺氧诱导的内皮细胞血管新生(P<0.001),并下调血管内皮生长因子和血小板衍生生长因子的表达(P<0.01)。(4)结果证实,内皮细胞特异性骨形态发生蛋白2具有调控血管新生作用,靶向性内皮细胞骨形态发生蛋白2可望改善血管新生。

关键词：内皮细胞骨形态发生蛋白2 血管新生单细胞RNA测序批量RNA测序信号通路后肢缺血模型成管实验

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

C反应蛋白/白蛋白比值对2型糖尿病合并急性心肌梗死患者远期不良心脑血管事件的预测价值研究

引用

中国全科医学 2025年第6期28卷 705-712页

作者：马娟马盛宗燕茹马学平贾绍斌宁夏医科大学总医院心血管内科宁夏回族自治区银川市750000 宁夏回族自治区人民医院妇产科宁夏回族自治区银川市750000

背景急性心肌梗死(AMI)是威胁全球公众健康的主要原因之一。虽然已有相应的再灌注治疗策略,但AMI相关的主要不良心脑血管事件(MACCEs)仍然是全世界人口死亡的原因之一。尤其合并糖尿病的AMI患者,因冠状动脉病变复杂,病变程度严重,尽早... 详细信息

背景急性心肌梗死(AMI)是威胁全球公众健康的主要原因之一。虽然已有相应的再灌注治疗策略,但AMI相关的主要不良心脑血管事件(MACCEs)仍然是全世界人口死亡的原因之一。尤其合并糖尿病的AMI患者,因冠状动脉病变复杂,病变程度严重,尽早发现和判断该部分患者远期预后相对困难,因此寻找相对简便、易获得的实验室指标,有利于为2型糖尿病(T2DM)合并AMI患者经皮冠状动脉介入(PCI)术后MACCEs的预测提供依据。目的探讨血清C反应蛋白(CRP)/白蛋白(Alb)比值(CAR)对T2DM合并AMI患者PCI术后远期MACCEs的预测价值。方法纳入2014—2019年就诊于宁夏医科大学总医院心血管内科1683例T2DM合并AMI患者为研究对象,收集患者的一般临床资料与检查结果。对所有患者进行电话或门诊随访,以全因死亡、非致死性心肌梗死、再发不稳定型心绞痛、非致死性脑卒中、新发心力衰竭或心力衰竭加重再入院、再次血运重建作为MACCEs。根据患者随访期间是否发生MACCEs分为MACCEs组(508例)和非MACCEs组(1175例)。采用单因素及多因素Logistic回归分析探讨T2DM合并AMI患者MACCEs事件的影响因素。采用Kaplan-Meier法绘制患者的生存曲线,生存曲线的比较采用Log-rank检验。采用受试者工作特征(ROC)曲线分析CAR对T2DM合并AMI患者远期发生MACCEs的预测效能,使用净重分类改善指标(NRI)和综合判别指数(IDI)评价CAR对T2DM合并AMI患者预后评估的改善效果。结果1683例患者中508例(30.18%)患者发生MACCEs。多因素Logistic回归分析显示高血压病[OR(95%CI)=1.994(1.142~3.483)]、冠状动脉植入支架长度[OR(95%CI)=1.031(1.002~1.062)]、CRP[OR(95%CI)=0.950(0.915~0.986)]、Alb[OR(95%CI)=0.933(0.880~0.989)]及CAR[OR(95%CI)=5.582(1.705~18.277)]是T2DM合并AMI患者PCI术后发生MACCEs的影响因素(P<0.05)。根据CAR中位表达水平(0.86),将患者分为CAR<0.86组和CAR≥0.86组,Log-rank检验结果显示,CAR≥0.86组MACCEs发生率高于CAR<0.86组(52.68%与22.92%;χ^(2)=65.65,P<0.001)。ROC曲线显示CAR预测T2DM合并AMI患者发生MACCEs的ROC曲线下面积为0.728(95%CI=0.702~0.754),最佳截断值为0.576,灵敏度为0.617,特异度为0.747。在基线模型基础上,与CRP、Alb相比,CAR能明显改善对患者发生MACCEs的预测效果(NRI=0.377,IDI=0.166,C指数=0.690;P<0.05)。结论CAR是T2DM合并AMI患者PCI术后远期MACCEs发生风险的有效预测指标。

关键词：心肌梗死糖尿病,2型主要不良心脑血管事件 C反应蛋白白蛋白预测

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

Grid authentication from identity-based cryptography without random oracles

引用

The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 55-59页

作者： ZHENG yan WANG Hai-yan WANG ru-chuan College of Computer Science Nanjing University of Posts and Telecommunications Nanjing 210003 China

As a critical component of grid security, secure and efficient grid authentication needs to be well addressed. However, the most widely accepted and applied grid authentication is based on public key infrastructure （PKI） and X.509 certificates, which make the system have low processing efficiency and poor anti-attack capability. To accommodate the challenge of grid authentication, this article aims at designing a secure and efficient method for grid authentication by employing identity-based cryptography （IBC）. Motivated by a recently proposed secure and efficient identity-based encryption （IBE） scheme without random oracles, an identity-based signature （IBS） scheme is first proposed for the generation of private key during grid authentication. Based on the proposed IBS and the former IBE schemes, the structure of a novel grid authentication model is given, followed by a grid authentication protocol described in detail. According to the theoretical analysis of the model and the protocol, it can be argued that the new system has improved both the security and efficiency of the grid authentication when compared with the traditional PKI-based and some current IBC-based models.

关键词： grid authentication security IBC scheme

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

An Alternating Polymer of Two Building Blocks Based on B←N Unit:Non-fullerene Acceptor for Organic Photovoltaics

引用

Chinese Journal of Polymer Science 2017年第2期35卷 198-206页

作者： ru-yan Zhao 窦传冬刘俊 Li-xiang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

B-N coordination bond can be used to develop polymer electron acceptors for efficient all-polymer solar cells （all-PSCs）. Here, we report a new alternating conjugated polymer containing two building blocks based on B-N unit. The polymer exhibits strong light absorption in the visible range, low-lying LUMO/HOMO energy levels and moderate electron mobility. The resulting all-PSC devices exhibit power conversion efficiencies of 1.50%-2.47%.

关键词： All-polymer solar cells Polymer acceptor Boron B-N coordination bond

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

Plastic bronchitis associated with Botrytis cinerea infection in a child:A case report

引用

World Journal of Clinical Cases 2020年第20期8卷 5019-5024页

作者： yan-ru Liu Tao Ai Department of Pediatric Respiratory Medicine Chengdu Women’s and Children’s Central HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 611731Sichuan ProvinceChina

BACKGROUND Plastic bronchitis(PB)frequently occurs in children after the surgical repair of congenital cardiac defects or in the presence of inflammatory or allergic diseases of the *** epidemiological data of this condition are still *** SUMMARY A 5-year-old boy,with a clear medical history,presented to our hospital with persistent cough and pneumonia with segmental atelectasis on chest computerized *** showed no significant improvement after 1 wk of amoxicillin-clavulanate potassium *** casts were extracted using flexible *** examination of the dendritic cast confirmed the diagnosis of type I *** cinerea was detected by next-generation sequencing of the bronchoalveolar lavage *** the removal of the airway obstruction and fluconazole treatment,the patient recovered and was discharged 14 d after admission without the recurrence of *** Botrytis cinerea pneumonia should be considered in children with PB who still have prolonged cough and atelectasis after a regular course of antibiotic *** bronchoscopy and etiological examination should be performed in a timely manner to determine the diagnosis,clear the airway obstruction,and target etiological treatment.

关键词： Bronchial casts Botrytis cinerea Pneumonia Children Case report

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

The damage evolution behavior of polypropylene fiber reinforced concrete subjected to sulfate attack based on acoustic emission

引用

Frontiers of Structural and Civil Engineering 2022年第3期16卷 316-328页

作者： Ninghui LIANG Jinwang MAO ru yan Xinrong LIU Xiaohan ZHOU School of Civil Engineering Chongqing UniversityChongqing 400045China National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area Chongqing UniversityChongqing 400045China Power China Chengdu Engineering Corporation Ltd. Chengdu 610072China

To study the damage evolution behavior of polypropylene fiber reinforced concrete(PFRC)subjected to sulfate attack,a uniaxial compression test was carried out based on acoustic emission(AE).The effect of sulfate attack relative to time and fiber hybridization were analyzed and the compression damage factor was calculated using a mathematical *** changes to AE ringing counts during the compression could be divided into compaction,elastic,and AE signal hyperactivity *** the initial stage of sulfate attack,the concrete micropores and microcracks were compacted gradually under external load and a corrosion products filling effect,and this corresponded with detection of few AE signals and with concrete compression strength *** increasing sulfate attack time,AE activity *** cumulative AE ringing counts of PFRC at all corrosion ages were much higher than those for plain *** could still produce AE signals after peak load due to drawing effect of polypropylene *** 150 d of sulfate attack,the cumulative AE ringing counts of plain concrete went down by about an order of magnitude,while that for PFRC remained at a high *** initial damage factor of hybrid PFRC was-0.042 and-0.056 respectively after 150 d of corrosion,indicating that the advantage of hybrid polypropylene fiber was more obvious than plain concrete and single-doped *** on a deterioration equation,the corrosion resistance coefficient of hybrid PFRC would be less than 0.75 after 42 drying-wetting sulfate attack cycles,which was 40%longer than that of plain concrete.

关键词： polypropylene fiber reinforced concrete sulfate attack damage evolution behavior acoustic emission damage factor

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

High-level theoretical study of the evolution of abundances and interconversion of glycine conformers

引用

Chinese Physics B 2018年第4期27卷 264-271页

作者： Fan Liu Jing Yu yan-ru Huang College of Science Liaoning Shihua University Fushun 113001 China

The relative conformer energies of glycine are evaluated by using a focal point analysis expressed as（HF→MP2→MP3→CCSD→CCSD（T））.The conformer abundances at various temperatures（298–500 K） are calculated based on the relative energies and Boltzmann statistical thermostatistical analysis with and without considering internal hindered rotations.A comparison between the available Raman spectrum and the electron momentum spectrum confirms that the influence of rigid-rotor hindered rotation on the conformational proportions of glycine is considerable,especially for the IIIp *** conformational interconversions are *** is found that with increasing temperature,the mole fraction of IIn keeps constant and Ip structure can convert into IVn and IIIp,leading to the decrease in the weight of Ip and the increase in the weights of IVn and IIIp conformers,which is in accordance with experimental observations.

关键词： glycine conformation abundance interconversion

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

AABN: Anonymity Assessment Model Based on Bayesian Network With Application to Blockchain

引用

China Communications 2019年第6期16卷 55-68页

作者： Tianbo Lu ru yan Min Lei Zhimin Lin School of Software Engineering Beijing University of Posts and Telecommunications100876 BeijingChina Key Laboratory of Trustworthy Distributed Computing and Service(Beijing University of Posts and Telecommunications) Ministry of Education100876 BeijingChina Information Security Center School of Cyberspace SecurityBeijing University of Posts and TelecommunicationsBeijing 100876China

Blockchain is a technology that uses community validation to keep synchronized the content of ledgers replicated across multiple users,which is the underlying technology of digital currency like *** anonymity of blockchain has caused widespread *** this paper,we put forward AABN,an Anonymity Assessment model based on Bayesian ***,we investigate and analyze the anonymity assessment techniques,and focus on typical anonymity assessment *** the related concepts involved in the assessment model are introduced and the model construction process is described in ***,the anonymity in the MIX anonymous network is quantitatively evaluated using the methods of accurate reasoning and approximate reasoning respectively,and the anonymity assessment experiments under different output strategies of the MIX anonymous network are analyzed.

关键词： blockchain anonymity assessment bayesian network MIX

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

Intuitionistic Fuzzy Laplacian Twin Support Vector Machine for Semi-supervised Classification

引用

Journal of the Operations Research Society of China 2022年第1期10卷 89-112页

作者： Jia-Bin Zhou yan-Qin Bai yan-ru Guo Hai-Xiang Lin Department of Mathematics Shanghai UniversityShanghai 200444China Delft Institute of Applied Mathematics Delft University of TechnologyDelft 2600GAThe Netherlands

In general,data contain noises which come from faulty instruments,flawed measurements or faulty *** with data in the context of classification or regression is inevitably affected by noises in the *** order to remove or greatly reduce the impact of noises,we introduce the ideas of fuzzy membership functions and the Laplacian twin support vector machine(Lap-TSVM).A formulation of the linear intuitionistic fuzzy Laplacian twin support vector machine(IFLap-TSVM)is ***,we extend the linear IFLap-TSVM to the nonlinear case by kernel *** proposed IFLap-TSVM resolves the negative impact of noises and outliers by using fuzzy membership functions and is a more accurate reasonable classi-fier by using the geometric distribution information of labeled data and unlabeled data based on manifold *** with constructed artificial datasets,several UCI benchmark datasets and MNIST dataset show that the IFLap-TSVM has better classification accuracy than other state-of-the-art twin support vector machine(TSVM),intuitionistic fuzzy twin support vector machine(IFTSVM)and Lap-TSVM.

关键词： Twin support vector machine Semi-supervised classification Intuitionistic fuzzy Manifold regularization Noisy data

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

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：