检索结果-南通市图书馆

Immunohistochemical　study　of　gastrin　in　colorectal　carcinoma　tissues　and　its　adjacent　mucosa

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1997年第2期3卷 27-29页

作者： jiang chun ping, CHEN Yu Quan, ZHU Jian Wei, SHEN Hong Xun and YU Xiu

AIM To study the expression of gastrin in colorectal carcinoma tissues and its adjacent mucosa and discuss the action of gastrin on colorectal carcinoma. METHODS The gastrin expression in colorectal carcinoma tissues and its adjacent mucosa of 58 cases was examined by using immunohistochemical and immunoelectron microscopic technique. RESULTS Of the transitional mucosa (TM) of co_ lorectal carcinoma, nontypical dysplasia mucosa and carcinoma tissue, the positive rate of gastrin is 35 1%, 48 3% and 60 3% respectively, with an increasing trend ( P <0 05). The granules of protein A gold (PAG) of immunoelectron microscopy may be seen in different electro density secreting granules in carcinoma cells and intercellular spaces or on the surface of membrane microvillus. CONCLUSION The existence of gastrin in colorectal carcinoma tissue and its adjacent mucosa, and the carcinoma cells forming gastrin granules to release the gastrin may be one of the initial factors in occurrence and development of the carcinoma. Positive expression of gastrin in colorectal carcinoma tissues serves as a marker indicating a good differentiation.

关键词： colorectal neoplasms gastrin immunohistochemistry microscopy, electron

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

可调谐超构透镜的发展现状

中国光学 2020年第1期13卷 43-61页

作者：林雨蒋春萍中国科学技术大学纳米技术与纳米仿生学院中国科学院纳米器件与应用重点实验室中国科学院苏州纳米技术与纳米仿生研究所

随着新兴光学设备对微型化、一体化、智能化光学变焦系统的需求与日俱增,大大促进了纳米光电子学的迅猛发展。超构透镜是由具有特殊电磁属性的人造元素按照一定的排列方式组成的具有透镜功能的二维平面结构,其最大优点就是:轻薄和易于... 详细信息

随着新兴光学设备对微型化、一体化、智能化光学变焦系统的需求与日俱增,大大促进了纳米光电子学的迅猛发展。超构透镜是由具有特殊电磁属性的人造元素按照一定的排列方式组成的具有透镜功能的二维平面结构,其最大优点就是:轻薄和易于集成。然而,集成在超构透镜上的微纳结构一旦制备完成,便难以再改变其形貌或者尺寸,因而无法对其聚焦性能进行实时调控,限制了其功能及应用范围的进一步扩展。近年来,科学家们探索了实现超构透镜聚焦性能实时调控的多种途径,其中最引人注目的是将智能材料与超构透镜相结合。本文首先回顾了可调谐超构透镜的最新进展,分别详细阐述和分析了它们的调节原理和器件性能。最后,归纳分析了当前阻碍可调谐超构透镜发展的主要问题,并进一步对未来可调谐超构透镜的发展趋势做出了展望。

关键词：纳米光电子学可调谐超构透镜智能材料聚焦性能

Origin of the Novel Magnetoresistance Oscillation of the Two-Dimensional Electron Gas in Al_(x)Ga_(l-x)N/GaN Heterostructures

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 Physics Letters 2001年第12期18卷 1641-1643页

作者： ZHENG Ze-Wei SHEN Bo jiang chun-ping ZHANG Rong SHI Yi ZHENG You-Dou ZHENG Guo-Zhen GUO Shao-Ling CHU Jun-Hao National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093 National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083

In the magnetotransport measurements of the two-dimensional electron gas (2DEG) in modulation-doped Al_(0.22)Ga_(0.7)sN/C heterostructures, a new magnetoresistance oscillation of the 2DEG is observed at low magnetic fields when the Al_(0.22)Ga_(0.7)sN layer on GaN is partially relaxed. It is thought that the misfit dislocations induced by the partially relaxed Al_(0.22)Ga_(0.7)sN layer modulate the distribution of the piezoelectric polarization-induced charges at the Al0.22Ga0.7sN/GaN heterointerface, and thus produce a strong modulation potential at the heterointerface. The strong modulation potential results in the novel magnetoresistance oscillation of the 2DEG at low magnetic fields.

关键词： N/Ga polarization relaxed

Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

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

Nano-Micro Letters 2025年第3期17卷 152-167页

作者： Jie Bai Jian Hui Jia Yu Wang chun Cheng Yang Qing jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries

钇铝石榴石上Mn-Co-Ni-O薄膜的制备及其相关特性表征

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

红外与毫米波学报 2015年第1期34卷 41-43,59页

作者：步海军焦新兵蒋春萍中国科学院苏州纳米技术与纳米仿生研究所、纳米器件及相关材料研究部、中国科学院纳米技术与应用重点实验室江苏苏州215123

利用化学溶液法在具有良好导热性和红外透过性的钇铝石榴石单晶衬底上成功制备了具有单一尖晶石相的Mn1.56Co0.96Ni0.48O4薄膜.傅里叶红外光谱测试表明薄膜在2.5~5μm波段具有明显的吸收带.通过研究其电阻-温度关系并利用最近邻跳跃模... 详细信息

利用化学溶液法在具有良好导热性和红外透过性的钇铝石榴石单晶衬底上成功制备了具有单一尖晶石相的Mn1.56Co0.96Ni0.48O4薄膜.傅里叶红外光谱测试表明薄膜在2.5~5μm波段具有明显的吸收带.通过研究其电阻-温度关系并利用最近邻跳跃模型进行拟合,得到薄膜的特征温度约为2 530 K,室温下的负电阻温度系数约为-3.66%K-1.

关键词：热敏电阻钇铝石榴石红外吸收

Hg_(1- x)Cd_x Te禁带宽度附近折射率增强效应(英文)

在线全文

学校读者我要写书评

暂无评论

红外与毫米波学报 2001年第3期20卷 161-164页

作者：黄志明张展竑蒋春萍褚君浩中国科学院上海技术物理研究所红外物理国家重点实验室上海200083

用红外椭圆偏振光谱测量了室温下 Hg1 - x Cdx Te(x=0 .2 76 ,0 .30 9,0 .378)体材料位于禁带宽度之下、附近和之上的折射率 .对每一种组份样品均观察到明显的折射率增强效应 .折射率峰值所对应的能量位置近似等于其禁带宽度 .禁带宽度... 详细信息

用红外椭圆偏振光谱测量了室温下 Hg1 - x Cdx Te(x=0 .2 76 ,0 .30 9,0 .378)体材料位于禁带宽度之下、附近和之上的折射率 .对每一种组份样品均观察到明显的折射率增强效应 .折射率峰值所对应的能量位置近似等于其禁带宽度 .禁带宽度之上折射率随波长 λ变化可用 Sellmeier色散关系 n2 (λ) =a1 + a2 / λ2 + a3/ λ4+ a4/ λ6进行拟合 .

关键词：红外椭偏光谱折射率半导体红外材料

Acute and chronic excitotoxicity in ischemic stroke and late-onset Alzheimer's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 1981-1988页

作者： Shan ping Yu Emily Choi Michael Qjiang Ling Wei Department of Anesthesiology Emory University School of MedicineAtlantaGAUSA Center for Visual and Neurocognitive Rehabilitation Atlanta Veterans Affairs Medical CenterDecaturGAUSA

Stroke and Alzheimer's disease are common neurological disorders and often occur in the same *** comorbidity of the two neurological disorders represents a grave health threat to older *** review presents a brief background of the development of novel concepts and their clinical *** activity of glutamatergic N-methyl-D-aspartate receptors and N-methyl-D-aspartate receptor-mediated Ca^(2+)influx is critical for neuronal *** ischemic insult induces prompt and excessive glutamate release and drastic increases of intracellular Ca^(2+)mainly via N-methyl-D-aspartate receptors,particularly of those at the extrasynaptic *** Ca^(2+)-evoked neuronal cell death in the ischemic core is dominated by necrosis within a few hours and days known as acute ***,mild but sustained Ca^(2+)increases under neurodegenerative conditions such as in the distant penumbra of the ischemic brain and early stages of Alzheimer's disease are not immediately toxic,but gradually set off deteriorating Ca^(2+)-dependent signals and neuronal cell loss mostly because of activation of programmed cell death *** on the Ca^(2+)hypothesis of Alzheimer's disease and recent advances,this Ca^(2+)-activated“silent”degenerative excitotoxicity evolves from years to decades and is recognized as a unique slow and chronic *** N-methyl-D-aspartate receptor subunit GluN3A,primarily at the extrasynaptic site,serves as a gatekeeper for the N-methyl-D-aspartate receptor activity and is neuroprotective against both acute and chronic *** stroke and Alzheimer's disease,therefore,share an N-methyl-D-aspartate receptor-and Ca^(2+)-mediated mechanism,although with much different time *** is thus proposed that early interventions to control Ca^(2+)homeostasis at the preclinical stage are pivotal for individuals who are susceptible to sporadic late-onset Alzheimer's disease and Alzheimer's disease-related

关键词： Ca^(2+)hypothesis cognitive deficits hyperactivity late-onset Alzheimer's disease neurodegeneration N-methyl-D-aspartate receptors N-methyl-D-aspartate receptor subunits pathogenesis preventive treatment