检索结果-南通市图书馆

Remote ischemic preconditioning protects liver ischemia-reperfusion injury by regulating eNOS-NO pathway and liver microRNA expressions in fatty liver rats

引用

Hepatobiliary & Pancreatic Diseases International 2017年第4期16卷 387-394页

作者： Yun-Fei duan yong An Feng Zhu yong Jiang Department of Hepatobiliary Surgery The Third Affiliated Hospital of Soochow UniversityChangzhou 213003China

BACKGROUND: Ischemic preconditioning (IPC) is a strategy to reduce ischemia-reperfusion (I/R) injury. The protective effect of remote ischemic preconditioning (RIPC) on liver I/R injury is not clear. This study aimed to investigate the roles of RIPC in liver I/R in fatty liver rats and the involvement of endothelial nitric oxide synthase-nitric oxide (eNOS-NO) pathway and microRNA expressions in this process. METHODS: A total of 32 fatty rats were randomly divided into the sham group, I/R group, RIPC group and RIPC+I/R group. Serum alanine aminotransferase (ALT), aspartate aminotransferase (AST) and nitric oxide (NO) were measured. Hematoxylin-eosin staining was used to observe histological changes of liver tissues, TUNEL to detect hepatocyte apoptosis, and immunohistochemistry assay to detect heat shock protein 70 (HSP70) expression. Western blotting was used to detect liver inducible NOS (iNOS) and eNOS protein levels and realtime quantitative polymerase chain reaction to detect miR-34a, miR-122 and miR-27b expressions. RESULTS: Compared with the sham and RIPC groups, serum ALT, AST and iNOS in liver tissue were significantly higher in other two groups, while serum NO and eNOS in liver tissue were lower, and varying degrees of edema, degeneration and inflammatory cell infiltration were found. Cell apoptosis number was slightly lower in the RIPC+I/R group than that in I/R group. Compared with the sham group, HSP70 expressions were significantly increased in other three groups (all P<0.05). Compared with the sham and RIPC groups, elevated miR-34a expressions were found in I/R and RIPC+I/R groups (P<0.05). MiR-122 and miR-27b were found significantly decreased in I/R and RIPC+I/R groups compared with the sham and RIPC groups (all P<0.05). CONCLUSION: RIPC can reduce fatty liver I/R injury by affecting the eNOS-NO pathway and liver microRNA expressions.

关键词： fatty liver ischemia-reperfusion remote ischemic preconditioning nitric oxide heat shock protein 70 endothelial nitric oxide synthase inducible nitric oxide synthase liver microRNA

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

Acute extensive portal and mesenteric venous thrombosis after splenectomy:Treated by interventional thrombolysis with transjugular approach

引用

World Journal of Gastroenterology 2009年第24期15卷 3038-3045页

作者： Mao-qiang Wang Han-Ying Lin Li-Ping Guo Feng-yong Liu Feng duan Zhi-Jun Wang Department of Interventional Radiology Chinese PLA General Hospital Beijing 100853 China

AIM:To present a series of cases with symptomatic acute extensive portal vein(PV)and superior mesenteric vein(SMV)thrombosis after splenectomy treated by transjugular intrahepatic approach catheter-directed thrombolysis. METHODS:A total of 6 patients with acute extensive PV-SMV thrombosis after splenectomy were treated by transjugular approach catheter-directed thrombolysis. The mean age of the patients was 41.2 *** access to the portal system via the transjugular approach,pigtail catheter fragmentation of clots, local urokinase injection,and manual aspiration thrombectomy were used for the initial treatment of PV-SMV thrombosis,followed by continuous thrombolytic therapy via an indwelling infusion catheter in the SMV,which was performed for three to six days. Adequate anticoagulation was given during treatment, throughout hospitalization,and after discharge. RESULTS:Technical success was achieved in all 6 *** improvement was seen in these patients within 12-24 h of the *** complications were *** 6 patients were discharged 6-14 d(8±2.5 d)after *** mean duration of follow-up after hospital discharge was 40±16.5 *** and contrast-enhanced computed tomography confirmed patency of the PV and SMV,and no recurrent episodes of PV-SMV thrombosis developed during the follow-up period. CONCLUSION:Catheter-directed thrombolysis via transjugular intrahepatic access is a safe and effective therapy for the management of patients with symptomatic acute extensive PV-SMV thrombosis.

关键词： Mechanical thrombectomy Portal vein Splenectomy Superior mesenteric vein Thrombolysis Thrombosis

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

Tearing Toughness of Ductile Metals

引用

Acta Metallurgica Sinica(English Letters) 2016年第2期29卷 150-155页

作者： Cui-Hong Li Qi-qiang duan Zhe-Feng Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

A new parameter, i.e., tearing toughness, was employed to characterize the mechanical properties of some ductile metals （Cu, Cu-2 wt% Be, Cu-Al alloys, and some steels） by using three-leg trousers tearing tests. The experi- mental results demonstrate that their tearing toughness is not a physical constant and shows a close relationship with the materials＇ types and microstructures. It can be inferred that the tearing toughness of different ductile metals has their respective variation range, expectantly, and may be represented by the comprehensive mechanical properties of strength and ductility for various ductile materials.

关键词： Ductile metals Strength Ductility Tearing toughness

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

AdaptNF: Adaptive service chain scheduling with stateless migration and NF consolidation

引用

Digital Communications and Networks 2023年第2期9卷 462-472页

作者： Qing Li He Huang yong Jiang Jingpu duan Peng Cheng Laboratory Shenzhen518000China Tsinghua Shenzhen International Graduate School Shenzhen10003China Southern University of Science and Technology Shenzhen14325China

The combination of network function virtualization and software-defined networking allows various network functions to process flows according to their characteristics and *** to the highly dynamic nature of the workload,the network infrastructure needs to properly schedule the underlying resources in order to respond to workload changes in a timely ***,the existing NFV platform lacks a comprehensive solution for how to scale under workload variation,which may seriously hurt the overall system *** improve the scalability of the NFV platform and ensure consistent high performance under dynamic workloads,we propose AdaptNF,a novel NFV platform designed to support a combination of course-grained and fine-grained resource scheduling *** deal with resource imbalance,which is the essential scheduling problem that leads to insufficient NFV performance,AdaptNF adopts a novel algorithm that can efficiently balance the workload among multiple network function instances through stateless flow *** controlled experiments show that the AdaptNF scheme can optimize resource allocation and ensure outstanding performance after *** terms of network throughput and latency,AdaptNF significantly improves the performance of the underlying NFV platform.

关键词： Network function virtualization Software-defined networking Service chain Flow migration Dynamic scale

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

Time-sensitivity mechanism of rock stress memory properties under tensile stress

引用

Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 528-540页

作者： Yuxin Ban Xiang Fu qiang Xie Jun duan School of Civil Engineering Chongqing UniversityChongqing400044China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing400044China School of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing400074China Changjiang River Scientific Research Institute of Changjiang Water Resources Commission Wuhan430010China

In deep underground engineering,understanding of time-related stress memory properties is critical to evaluate the in situ stress conditions of a rock *** this study,the time-sensitivity mechanism of the rock stress memory properties under tensile stress was *** was found that the material property(Poisson’s ratio)and crack angle were the controlling factors of the Kaiser effect(KE)under tensile *** particular,the time-sensitivity of the stress memory properties was closely related to the crack growth *** the failure of the rock specimen was dominated by tensile microcracks and the crack development direction was deflected by up to 30°in the successive loading process,the stress memory capacity was likely to be time-independent for a sandstone *** distribution of the Felicity ratio in a Brazilian test was more discrete than that in a three-point bending test It also showed that the changes in the crack path,rather than the time interval between successive loading cycles,led to inaccuracy of the detected *** study provides insights into stress memory-related issues under uniaxial or more complex stress conditions and thus facilitates development of methods for testing in situ mechanical behaviors of rocks with acoustic emission(AE)technology.

关键词： Acoustic emission(AE) Time-sensitivity Stress memory Kaiser effect(KE) Brazilian disc rotation Power spectrum

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

Development of a test strip based on DNA-functionalized gold nanoparticles for rapid detection of mercury(II) ions

引用

Chinese Chemical Letters 2012年第2期23卷 225-228页

作者： Jing duan Zhi yong Guo Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China

A rapid,sensitive,selective and reliable strip assay based on DNA-functionalized gold nanoparticles for Hg^（2＋） detection has been developed,with a detection limit 5 nmol/*** measurement principle was based on thymine-Hg^（2＋）-thymine（T-Hg^（2＋）-T） coordination chemistry and streptavidin-biotin *** major advantages of this assay are that results can be read visually without any instrument in less than 10 min and that it does not require any sample pretreatment.

关键词： Mercury(Ⅱ) ion Test strip Gold nanoparticles DNA

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

Rare case of omentum-wrapped abscess caused by a fish bone penetrating the terminal ileum

引用

World Journal of Gastroenterology 2014年第32期20卷 11456-11459页

作者： Chuan-Xing Wu Bao-qiang Wu Yun-Fei duan Dong-Lin Sun yong Jiang Department of Hepatobiliary Surgery The Third Affiliated Hospital of Soochow University The First People Hospital of Changzhou

Accidentally ingested foreign bodies, for the most part, pass through the gastrointestinal tract, but can cause several complications. Perforation is rare, but can occur in any segment of the gastrointestinal tract. Intestinal perforations due to foreign bodies are rarely diagnosed preoperatively as clinical symptoms are non-specific and they can mimic other abdominal conditions. We describe a case of a 48-year-old patient who was admitted to the emergency room because of severe abdominal pain of 5 d duration. A computed tomography scan showed an undefined liquid collection involving a linear image 35 mm in size, suggestive of a foreign body. On laparotomy, an abscess containing a fish bone was resected. As fish bone ingestion is usually not remembered by the patient, the diagnosis can be delayed. The preoperative diagnosis is frequently acute abdomen of unknown cause. A low threshold of suspicion along with a good clinical history and radiologicalstudies are extremely important in order to make a correct diagnosis.

关键词： Foreign body Fish bone Terminal ileum perforation

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

Synthesis of novel thieno-[3,4-b]-pyrazine-cored molecules as red fluorescent materials

引用

Chinese Chemical Letters 2013年第9期24卷 809-812页

作者： Di Liu yong-Heng duan State Key Laboratory of Fine Chemicals School of Chemistry Dalian University of Technology

Two novel thieno-[3,4-b]-pyrazine-based molecules, TP-E and TP-O, were designed and synthesized for potential application as red fluorescent emitters. The bulky tetraphenylethylene groups were attached at the periphery of the thieno-[3,4-b]-pyrazine core to form the non-planar molecules, as efficient solid- state emitting materials. The peripheral groups were grafted to the emissive core through either a conjugated acetylene bond, or a non-conjugated ether bond. These molecules exhibit strnng red fluorescence in both dilute solutions and in thin films with large Stokes shifts of over 100 nm. The cyclic voltammetry measurements showed the reversible oxidation and reduction behavior for both compounds. All these properties indicate the two compounds are possible functional materials for use in ontoelectronic devices.

关键词： Red fluorescent materials Thieno-[ 3 4-b ]-pyrazine Tetraphenylethylene Large Stokes shifts

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

Cross-linking density and aging constitutive model of HTPB coating under prestrain thermal accelerated aging

引用

Defence Technology（防务技术） 2020年第2期16卷 439-446页

作者： yong-qiang Du Jian Zheng Chao Xiong Shijiazhuang Campus Army Engineering UniversityShijiazhuang 050003China

In order to study the cross-linking density and aging constitutive relationship of HTPB coating during storage,the thermal accelerated aging tests at 0%,3%,6%and 9%prestrains were carried *** crosslinking density of HTPB coating at different aging stages were tested using low-field^1 H NMR and the variation of cross-linking density was *** aging model of cross-linking density considering the chemical aging and the physical stretching factors was *** uniaxial tensile tests were carried out on HTPB coating at different aging stages and the cross-linking density was introduced into Ogden hyperelastic constitutive model as a characterization parameter of correction *** with uniaxial tensile test results,a prestrain aging constitutive model of HTPB coating was *** results show that the cross-linking density of HTPB coating increases rapidly at first and then slowly with the increase of thermal accelerated aging time without *** prestrain conditions,the crosslinking density of HTPB coating decreases at the early stage,and increases rapidly at first and then slowly at the middle and late stages of thermal accelerated *** correlation coefficients of aging model of cross-linking density and aging constitutive model with test results are R>0.9500 and R>0.9900 respectively,which can be used to accurately describe the cross-linking density and aging constitutive relationship of HTPB coating under prestrain accelerated thermal aging conditions.

关键词： Prestrain thermal accelerated aging Low-field^1H NMR Cross-linking density Aging constitutive model

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

The Boltzmann Equation with Time-periodic Boundary Temperature

引用

Acta Mathematicae Applicatae Sinica 2019年第1期35卷 174-208页

作者： Renjun duan yong WANG Zhu ZHANG Department of Mathematics The Chinese University of Hong Kong Academy of Mathematics and Systems Science Chinese Academy of Sciences University of Chinese Academy of Sciences

This paper is concerned with the boundary-value problem on the Boltzmann equation in bounded domains with diffuse-reflection boundary where the boundary temperature is time-periodic. We establish the existence of time-periodic solutions with the same period for both hard and soft potentials, provided that the time-periodic boundary temperature is sufficiently close to a stationary one which has small variations around a positive constant. The dynamical stability of time-periodic profiles is also proved under small perturbations, and this in turn yields the non-negativity of the profile. For the proof, we develop new estimates in the time-periodic setting.

关键词： Boltzmann equation time-periodic boundary time-periodic solutions existence dynamical stability a priori estimates

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：