Results 31 to 40 of about 26,778 (175)

体外诱导人羊膜上皮细胞分化为神经样细胞

open access: yesZhongguo shiyan zhenduanxue, 2011
目的探讨人羊膜上皮细胞体外向神经样细胞诱导分化的条件。方法碱性成纤维细胞生长因子预诱导剂(bFGF),化学诱导剂全反式维甲酸(ATRA)、丁酸羟基茴香醚(BHA)作为诱导剂,并以不含诱导剂的无血清的MEM培养基作为对照,密切观察分化过程中细胞形态的变化,诱导至6 h、12 h、24 h时,利用免疫细胞化学方法检测神经元特异性标志物的表达情况。结果诱导分化12 h后的ATRA组大部分细胞呈现双极、多极和锥形的典型神经元细胞的形态,免疫细胞化学显示这些细胞表现为NSE染色阳性,而丁酸羟基茴香醚(BHA ...
刘红敏, 陈旭东, 华新宇
doaj  

N-Oleoylethanolamine attenuates cytokines and adhesion molecules production in TNF-α-induced human umbilical vein endothelial cells by activating PPAR-α and CB2 [PDF]

open access: yes, 2015
研究背景:动脉粥样硬化(Atherosclerosis,As)是由多个因素造成的开始于动脉内膜的一种疾病,现如今As的发病率和致死率逐渐升高,并且发病年龄年轻化。大量的流行病学调查和实验研究证明,高血脂、高血压、吸烟、糖尿病等都是与As发生相关的危险因素,但关于As发生的机制一直众说纷纭,直到1999年,ROSS等提出“As是一种慢性炎症性疾病”的观点,给As的研究带来了一个全新的方向与思路。本论文的研究就是基于这个观点,从炎症反应的角度去探索一种新的、副作用小的抗动脉粥样硬化药物。油酰乙醇胺(N ...
许旭东
core  

Velocity‐Iterative Directional Annealing Enables Ultra‐Elongated Columnar Grains and Exceptional Ductility in TiAl Alloys

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT This study introduces a novel velocity‐iterative directional annealing (IDA) strategy to overcome stagnation challenges in columnar grain growth of Ti‐48Al‐2Cr‐2Nb alloys. By dynamically adjusting hot zone migration rates across iterative cycles, the IDA protocol achieved 92.2% synchronization between anisotropic α‐grain boundary (GB ...
Zedong Liu   +6 more
wiley   +1 more source

N-Myc-Interacting Protein (NMI)蛋白抑制胃癌上皮间质转化(EMT)的研究 [PDF]

open access: yes, 2016
上皮间质转化(EMT)与多种生长因子和转录因子相关,可以通过多种信号转导通路起作用,并在胚胎发育、损伤修复、许多慢性疾病及肿瘤的发生和发展中起着重要的作用,然而EMT在胃癌发生过程中的分子机制并不清楚。 核因子-κB(NF-κB)可以与多种基因启动子部位的κB位点发生特异性的结合并促进其转录表达,进而调控肿瘤的发生,影响EMT的进程。我们的工作发现了一个新的通过调控抑制NF-κB通路调控胃癌中EMT的蛋白-NMI(N-MycandSTATinteractor)。研究结果显示 ...
侯静静
core  

Achieving Ambient‐Temperature Fast Hydrogenation Properties in Ga‐Doped Mg–Ni Alloy: Dual‐Phase Synergistic Catalysis and Stacking Fault Channels

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The high operating temperatures and sluggish kinetics of Mg‐based hydrogen storage materials (HSMs) are urgently being addressed. In this work, a novel Mg–Ni–Ga HSM with dual‐phase synergistic catalysis is developed, including the fishbone‐like Mg3Ni2Ga1 catalytic phase and the Mg2Ni phase with stacking faults (SFs).
Shiyang Hu   +7 more
wiley   +1 more source

Protein phosphatase 2A-B55δ enhances chemotherapy sensitivity of human hepatocellular carcinoma under the regulation of microRNA-133b [PDF]

open access: yes, 2016
目的:原发性肝细胞癌(hepatocellularcarcinoma,HCC)是我国公共卫生关注的热点问题之一,寻找增强HCC化疗敏感性的有效干预靶点具有重要意义。蛋白磷酸酶2A(proteinphosphatase2A,PP2A)是重要的肿瘤抑制因子;PPP2R2D基因编码的PP2A-B55δ亚基参与细胞周期有丝分裂调控。我们前期研究验证了PPP2R2D基因3’-非翻译区(3’-untranslatedregion,3’UTR)的+15G>C多态性位点受微小RNA-133b(microRNA-133b,
庄群瑛
core  

Synergistic Enhancement of Mechanical and Tribological Properties in TiB2/Mo Composites via Core–Shell Structure Mediated Dislocations Migration

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Ceramic reinforcement is crucial for crafting ultrastrong and wear‐resistant metallic components. However, pronounced stress concentration and strain incompatibility at ceramic–metal interfaces often trigger microcrack initiation and ceramic spalling exacerbating friction under sliding conditions.
Dongting Li   +8 more
wiley   +1 more source

东北林蛙皮肤抗菌肽基因在毕赤酵母中表达条件的优化

open access: yes野生动物学报, 2013
目的:确定毕赤酵母表达东北林蛙皮肤抗菌肽dybowskin-1ST基因的最佳诱导表达条件。方法:本研究将PCR合成的dybowskin-1ST基因克隆到毕赤酵母表达载体pPIC9K中,构建pPIC9K-dybowskin-1ST诱导型表达载体。表达载体经线性化后转化巴斯德毕赤酵母GS115,应用BMMY培养基诱导表达。采用单一变量法及正交试验法,对甲醇诱导的浓度、时间和温度进行了优化,通过SDS-PAGE电泳分析和体外抑菌试验检测目的肽表达丰度。结果:最佳诱导条件:甲醇终浓度为0.5%、诱导时间为72 ...
崔绍鹏   +4 more
doaj  

Design and Implementation of City Traffic Guidance System Based on GPS Equipped Floating Car [PDF]

open access: yes, 2015
随着经济的发展及国民生活水平的提高,越来越多的人选择开车出行,这势必造成交通的拥堵。交通拥挤已经成为各个城市生活的主要问题,在城市建设基本完成的情况,如何充分利用路网的空间成了目前智能交通系统的一个重要的课题。 本文通过将行驶在城市各个方位的出租车作为采集数据的浮动车,将采集的GPS信息在GIS系统中进行处理分析,直观的判断展现路网拥挤度情况,为出行者和监管部门的决策提供实时的信息依据。 结合三亚的情况,出租车作为浮动车,在信息采集技术中首先确定浮动车采样时间间隔和浮动车样本量,之后数据会进行预处理 ...
林小琪
core  

Tailoring Differentiated Multiscale Microstructure to Enhance the Mechanical Properties of Additively Manufactured AlCoFeNi2 at Room and High Temperatures via Annealing

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Additively manufactured AlCoFeNi series eutectic high‐entropy alloys (EHEAs) exhibit nonequilibrium dual‐phase microstructure in the as‐printed state, allowing them to be easily tailored through annealing to explore their strength–toughness potential.
Huidong Wu   +13 more
wiley   +1 more source

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