检索结果-南通市图书馆

Correlation of CT enhancement, tumor angiogenesis and pathologic grading of pancreatic carcinoma

World Journal of Gastroenterology 2003年第9期9卷 2100-2104页

作者： Zhong-QiuWang jie-ShouLi Guang-MingLu Xin-HuaZhang zi-QianChen KuiMeng DepartmentofMedicalImaging JinlingHospitalMedicalSch0olNanjingUniversityNanjing210002JiangsuProvinceChina DepartmentofGeneralSurgery JinlingHospitalMedicalSchool-NanjingUniversityNanjing210002JiangsuProvinceChina DepartmentofPathology JinlingHospitalMedicalSchoolNanjingUniversityNanjing210002JiangsuProvinceChina

AIM: To study the correlation between pancreatic phase CT enhancement, intratumor microvessel density (MVD) and pathologic grading of pancreatic carcinoma and to evaluate the relationship between the degrees of CT enhancement and malignancy of pancreatic ***: Thirty four patients with pancreatic carcinoma underwent CT scanning before resection. The enhancement degrees and forms of tumor were observed in pancreatic phase. The operative sample was stained with HE and CD34marked by immunohistochemistry. MVD and histopathological grades of pancreatic carcinoma were examined. CT enhancement of the tumor, MVD counting in hot spot areas of neoplastic parenchymal cells and pathological grades of pancreatic carcinoma were comparatively ***: Highly differentiated pancreatic adenocarcinoma was identified in 16 patients, moderately-differentiated tumor in 7 and poorly-differentiated in 11. Isodensity CT enhancement was demonstrated in 13 cases, slightly low density enhancement in 9, slightly low density enhancement with small cystic lesions in 9 and slightly low density enhancement with large cystic lesions in 3. The counting of MVD with CD34 marked by immunohistochemistry in hot spot areas of neoplastic parenchyma cells was small in 10cases, medium in 16 and large in 8. The pathological grades correlated well with CT enhancement of the tumor (r=0.7857,P＜0.001) and with vMVD counting of tumor (r=0.3613,P＜0.05). The CT enhancement of tumor correlated with MVD(r=0.6768, P＜0.001).CONCLUSION: There is an obvious and significant correlation between CT enhancement, pathological grades and MVD number in the hot spot areas of tumor. The extent of CT enhancement is inversely proportional to the malignant degree of pancreatic carcinoma, and to the MVD number in the hot spot areas of neoplastic parenchyma. The MVD in the hot spot areas of neoplastic parenchyma cells can also reflect the prognosis of the patients, and is directly proportional to the malignant deg

关键词：胰腺癌 CT检查血管生成病理学

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

Sub-femto-Joule energy consumption memory device based on van der Waals heterostructure for in-memory computing

引用

Chip 2022年第2期1卷 35-42页

作者： zi-Jia Su zi-Hao Xuan Jing Liu Yi Kang Chun-Sen Liu Cheng-jie Zuo School of Microelectronics University of Science and Technology of ChinaHefeiAnhuiChina Institute of Microelectronics of Chinese Academy of Sci-ences BeijingChina Frontier Institute of Chip and System Shanghai Engi-neering Research Center of Next Generation IC Key TechnologyZhangjiang Fudan International Innovation CenterFudan UniversityShanghaiChina

In-memory computing has carried out calculations in situ within each memory unit and its main power consumption comes from data writ-ing and *** improvements in the energy efficiency of in-memory computing require memory devices with sub-femto-Joule energy *** gate memory devices based on two-dimensional(2D)material heterostructures have outstanding char-acteristics such as non-volatility,multi-bit storage,and low opera-tion energy,suitable for application in in-memory computing ***,we report a floating gate memory device based on a WSe 2/h-BN/multilayer-graphene/h-BN heterostructure,the energy consump-tion of which is in sub-femto Joule(0.6 fJ)per operation for pro-gram/erase,and the read power consumption is in the tens of femto Watt(60 fW)*** show a Hopfield neural network composed of WSe 2/h-BN/multilayer-graphene/h-BN heterostructure floating gate memory devices,which can recall the original patterns from incorrect *** results shed light on the development of future com-pact and energy-efficient hardware for in-memory computing sys-tems.

关键词： two-dimensional material heterostructures nonvolatile memory energy consumption sub-femto-Joule

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

Cold Model Study on Mg Desulfurization of Hot Metal Under Mechanical Stirring

引用

Journal of Iron and Steel Research International 2013年第12期20卷 1-6页

作者： LIU Yan ZHANG zi-mu LIU Jian-nan ZHANG Jun-hua Masamichi Sano ZHANG Jun Key Laboratory of Ecological Utilization of multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Beijing Institute of Technology Dalian University of Technology Nagoya University

The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.

关键词： gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal

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

Arabidopsis MADS-Box Transcription Factor AGL21 Acts as Environmental Surveillance of Seed Germination by Regulating ABI5 Expression

引用

Molecular Plant 2017年第6期10卷 834-845页

作者： Lin-Hui Yu jie Wu zi-Sheng Zhang zi-Qing Miao Ping-Xia Zhao Zhen Wang Cheng-Bin Xiang School of Life Sciences University of Science and Technology of China Hefei Anhui Province 230027 China Shanghai Center for Plant Stress Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China

Seed germination is a crucial checkpoint for plant survival under unfavorable environmental conditions. Ab- scisic acid （ABA） signaling plays a vital role in integrating environmental information to regulate seed germination. It has been well known that MCMI/AGAMOUS/DEFICIENS/SRF （MADS）-box transcription factors are key regulators of seed and flower development in Arabidopsis. However, little is known about their functions in seed germination. Here we report that MADS-box transcription factor AGL21 is a negative regulator of seed germination and post-germination growth by controlling the expression of ABA-INSENSITIVE 5 （ABIb＇） in Arabidopsis. The AGL21-overexpressing plants were hypersensitive to ABA, salt, and osmotic stresses during seed germination and early post-germination growth, whereas ag121 mutants were less sensitive. We found that AGL21 positively regulated ABI5 expression in seeds. Consistently, genetic analyses showed that AGL21 is epistatic to ABI5 in controlling seed germination. Chromatin immunoprecipitation assays further demonstrated that AGL21 could directly bind to the ABI5 promoter in plant cells. Moreover, we found that AGL21 responded to multiple environmental stresses and plant hormones during seed germination. Taken together, our results suggest that AGL21 acts as a surveillance integrator that incorporates environmental cues and endogenous hormonal signals into ABA signaling to regulate seed germination and early post-germination growth.

关键词： MADS AGL21 seed germination ABA ABI5

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

Effects of Ru content on phase transformation and compression property of cast TiAl alloys

引用

China Foundry 2020年第6期17卷 393-401页

作者： jie-ren Yang zi-xiang Jiao Dong-dong Zhu Yu-lun Wu zi-tong Gao Rui Hu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering&Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000China

Ruthenium(Ru)is a promising element to heighten the comprehensive mechanical properties of TiAl *** the present study,the phase transformation during the cooling of Ti-47Al-2Cr-2Nb-xRu(x=0,0.1,0.5,1.0,at.%)alloys was *** results show that Ru tends to segregate in the interdendritic region during solidification,and therefore,refines the as-cast microstructure of the *** aβ-stabilizer,Ru does not induce a novel solidification reaction but maintains the peritectic reaction of L+β→α.An excessive Ru content would cause the formation of(γ+τ1+B2)and(α+γ+τ1+B2)phase regions below 1,250°*** precipitation ofτ1-containing mixture is attributed to the Ru-segregation,which inhibits the reaction ofα→γand facilitates the formation of B2 *** discontinuous coarsening ofγphase and blockτ1 phase formed alternately in a manner of analogous eutectoid decomposition within B2 *** addition,the effect of Ru content on compression property of the alloys was *** yield strength increases up to 427 MPa at 800°C with the addition of 1.0at.%Ru,which is mainly due to the solution strengthening effect of Ru.

关键词： TiAl alloy solidification path microstructure phase transformation yield strength

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

Application of modified cerium dioxide for photocatalytic air pollution purification

引用

Rare Metals 2024年第11期43卷 5473-5486页

作者： Cheng-Zhang Zhu Qi-Hang Tian Bing-Han Wang mu-Tao Xu Qi-jie Jin zi-Ye Zhang Shu-Kun Le Yang Wu Yue-Chang Wei Hai-Tao Xu School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 210009China Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot 010050China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao SAR 999078China State Key Laboratory of Heavy Oil Processing Key Laboratory of Optical Detection Technology for Oil and GasChina University of PetroleumBeijing 102249China

Cerium dioxide(CeO_(2))is a significant rare earth oxide with the merits of rich oxygen defects,specific4f^(1)5d^(1)orbitals,and superior oxygen storage-release capacity in Ce^(4+)/Ce^(3+)reversibility pairs,and has been widely investigated as an active photocatalytic material for air pollution *** enhance the photocatalytic efficiency of CeO_(2),recent developments of numerous modification strategies have been employed to broaden the light absorption range and reduce the recombination rate of electron-hole *** review summarizes the fabrication of modified CeO_(2)catalysts,including metal or nonmetal doping,heterostructure construction and oxygen vacancy manufacturing,to provide insight into how those advanced techniques improve the photocatalytic ***,this work provides a detailed discussion on the usage of modified CeO_(2)in the fields of air pollution control,including nitrogen oxides removal,volatile organic compounds elimination and the purification of carbon ***,the potential future development and further research on the modification of CeO_(2)has been identified.

关键词： Cerium dioxide Element-doping Heterojunction Air pollution purification Photocatalytic activity

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

Synthesis of hierarchical Polystyrene/Polyaniline@Au nanostructures of different surface states and studies of their catalytic properties

引用

Science China Chemistry 2014年第9期57卷 1211-1217页

作者： YU jie GUO WanChun YANG mu LUAN Yi TAO JinZhang ZHANG XiaoWei School of Materials Science and Engineering University of Science and Technology Beijing

We synthesized hierarchical Polystyrene/Polyaniline@Au(PS/PANI@Au) catalysts through a seeded swelling polymerization and in-situ reduction procedure. PS/PANI@Au catalysts possess a core of PS as seed and template, a PANI shell with fibers and uniform gold nanoparticles on the surface. The configuration changes of the PANI chains resulting from the doping/ dedoping procedure led to various loading amounts of Au nanoparticles. Reduction of 4-nitrophenol was chosen as the probe reaction to evaluate the catalytic activity of supported Au nanocatalysts. The catalytic results indicated that dedoping treatment of the PS/PANI supports provides stronger coordinative ability to metal nanoparticles as well as more –N= groups, which results in a better catalytic performance towards the reduction of 4-nitrophenol.

关键词： hierarchical PS/PANI supported gold catalyst reduction of 4-nitrophenol doping/dedoping treatment

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

Humidity Sensitive Properties of a Silicone-containing Polyelectrolyte Material

引用

Chinese Chemical Letters 2006年第1期17卷 73-76页

作者： mu jie YANG Zong Wu YAO You Si CHEN Yang LI Department of polymer science and Engineering Zhejiang University Hangzhou 310027

Resistive-type film humidity sensors were prepared with a silicone-containing polyelectrolyte （Si-PE） and their humidity sensitive properties have been investigated. The sensors so obtained show high sensitivity to humidity variation over a wide range of RH （20-96%）. In addition, they exhibit high reversibility, quick response and well long-term stability.

关键词： Humidity sensor silicone-containing polyelectrolyte humidity sensitive properties.

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

Differentiation of a Miniature Inverted Transposable Element （MITE） System in Asian Rice Cultivars and Its Inference for a Diphyletic Origin of Two Subspecies of Asian Cultivated Rice

引用

Journal of Integrative Plant Biology 2006年第3期48卷 260-267页

作者： Hao Hu jie mu Hong-Ji Zhang Yue-Zhi Tao Bin Han National Center for Gene Research Shanghai Institutes of Biological Sciences the Chinese Academy of Sciences Shanghai 200233 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Zhejiang Academy of Agricultural Sciences Hangzhou 310021 China

In the present study, we report a survey on a Miniature Inverted Transposable Element （MITE） system known as mPing in 102 varieties of Asian cultivated rice （Oryza sativa L.）. We found that mPing populations could be generalized Into two families, mPing-1 and mPing-2, according to their sequence structures. Further analysis showed that these two families of mPing had significant bias in their distribution pattern in two subspecies of rice, namely O. sativa ssp. japonica and indica. 0. sativa japonica has a higher proportion of mPing-1 as a general trait, whereas 0. sativa indica has a higher proportion of roPing-2. We also examined the mPing system In a doubled haploid （DH） cross-breeding population of jingxi 17 （japonica） and zhaiyeqing 8 （indica） varieties and observed that the mPing system was not tightly linked to major subspecies-determining genes. Furthermore, we checked the mPing system in 28 accessions of Asian common wild rice O. rufipogon and found the roPing system in 0. rufipogon. The distribution pattern of the roPing system in O. rufipogon indicated a diphyletlc origin of the Asian cultivated rice O. sativa species. We did not find the mPing system in another 20 Oryza species. These results substantiated a previous hypothesis that O. ruflpogon and O. nivara species were the closest relatives of O. sativa and that the two extant subspecies of O. sativa were evolved independently from corresponding ecotypes of O. ruflpogon.

关键词： diphyletic indica japonica Miniature Inverted Transposable Element (MITE) mPing rice.

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

Downregulation of thioredoxin reductase 1 expression in the substantia nigra pars compacta of Parkinson's disease mice

引用

Neural Regeneration Research 2013年第35期8卷 3275-3283页

作者： zihua Liu Yuhong Jing jie Yin Jiying mu Tingting Yao Liping Gao Institute of Biochemistry and Molecular Biology School of Basic Medical Sciences Lanzhou University Institute of Anatomy and Embryology School of Basic Medical Sciences Lanzhou University Key Laboratory of Preclinical Study for New Drugs of Gansu Province

Because neurons are susceptible to oxidative damage and thioredoxin reductase 1 is extensively distributed in the central nervous system and has antioxidant properties, we speculated that the enzyme may be involved in the pathogenesis of Parkinson＇s disease. A Parkinson＇s disease model was produced by intraperitoneal injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine into C57BL/6 mice. Real-time reverse transcription-PCR, western blot analysis and colorimetric assay showed that the levels of thioredoxin reductase 1 mRNA and protein were decreased, along with a significant reduction in thioredoxin reductase activity, in the midbrain of Parkinson＇s disease mice compared with normal mice. Immunohistochemical staining revealed that the number of thioredoxin reductase 1-positive neurons in the substantia nigra pars compacta of Parkinson＇s disease mice was significantly decreased compared with normal mice. These experimental findings suggest that the expression of thioredoxin reductase 1 in the substantia nigra pars compacta of Parkinson＇s disease mice is significantly decreased, and that the enzyme may be associated with disease onset.

关键词： neural regeneration brain1,2,3,6-tetrahydropyridine oxidative stress: thioredoxinnjury neurodegenerationmidbrain substantia nigrareductase grants-supportedParkinson's disease 1-methyl-4-phenyl- pars compacta tyrosine hydroxylase paper neuroregeneration

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：