期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Neural stem cell-derived exosomes promote mitochondrial biogenesis and restore abnormal protein distribution in a mouse model of Alzheimer's disease 被引量:1
1
作者 Bo Li Yujie Chen +10 位作者 Yan Zhou Xuanran Feng Guojun Gu Shuang Han Nianhao cheng Yawen Sun Yiming Zhang jiahui cheng Qi Zhang Wei Zhang Jianhui Liu 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第7期1593-1601,共9页
Mitochondrial dysfunction is a hallmark of Alzheimer’s disease.We previously showed that neural stem cell-derived extracellular vesicles improved mitochondrial function in the cortex of AP P/PS1 mice.Because Alzheime... Mitochondrial dysfunction is a hallmark of Alzheimer’s disease.We previously showed that neural stem cell-derived extracellular vesicles improved mitochondrial function in the cortex of AP P/PS1 mice.Because Alzheimer’s disease affects the entire brain,further research is needed to elucidate alterations in mitochondrial metabolism in the brain as a whole.Here,we investigated the expression of several important mitochondrial biogenesis-related cytokines in multiple brain regions after treatment with neural stem cell-derived exosomes and used a combination of whole brain clearing,immunostaining,and lightsheet imaging to clarify their spatial distribution.Additionally,to clarify whether the sirtuin 1(SIRT1)-related pathway plays a regulatory role in neural stem cell-de rived exosomes interfering with mitochondrial functional changes,we generated a novel nervous system-SIRT1 conditional knoc kout AP P/PS1mouse model.Our findings demonstrate that neural stem cell-de rived exosomes significantly increase SIRT1 levels,enhance the production of mitochondrial biogenesis-related fa ctors,and inhibit astrocyte activation,but do not suppress amyloid-βproduction.Thus,neural stem cell-derived exosomes may be a useful therapeutic strategy for Alzheimer’s disease that activates the SIRT1-PGC1αsignaling pathway and increases NRF1 and COXIV synthesis to improve mitochondrial biogenesis.In addition,we showed that the spatial distribution of mitochondrial biogenesis-related factors is disrupted in Alzheimer’s disease,and that neural stem cell-derived exosome treatment can reverse this effect,indicating that neural stem cell-derived exosomes promote mitochondrial biogenesis. 展开更多
关键词 Alzheimer’s disease mitochondrial biogenesis neural stem cell-derived exosome SIRT1-PGC1α regional brain distribution whole brain clearing and imaging
下载PDF
Ultrahigh-brightness 50 MeV electron beam generation from laser wakefield acceleration in a weakly nonlinear regime
2
作者 Zhongtao Xiang Changhai Yu +8 位作者 Zhiyong Qin Xuhui Jiao jiahui cheng Qiaoxuan Zhou Gatie Axi Jianghua Jie Ya Huang Jintan Cai Jiansheng Liu 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第3期4-10,共7页
We propose an efficient scheme to produce ultrahigh-brightness tens of MeV electron beams by designing a density-tailored plasma to induce a wakefield in the weakly nonlinear regime with a moderate laser energy of 120... We propose an efficient scheme to produce ultrahigh-brightness tens of MeV electron beams by designing a density-tailored plasma to induce a wakefield in the weakly nonlinear regime with a moderate laser energy of 120 mJ.In this scheme,the second bucket of the wakefield can have a much lower phase velocity at the steep plasma density down-ramp than the first bucket and can be exploited to implement longitudinal electron injection at a lower laser intensity,leading to the generation of bright electron beams with ultralow emittance together with low energy spread.Three-dimensional particle-in-cell simulations are carried out and demonstrate that high-quality electron beams with a peak energy of 50 MeV,ultralow emittance of28 nm rad,energy spread of 1%,charge of 4.4 pC,and short duration less than 5 fs can be obtained within a 1-mm-long tailored plasma density,resulting in an ultrahigh six-dimensional brightness B6D,n of2×1017 A/m2/0.1%.By changing the density parameters,tunable bright electron beams with peak energies ranging from 5 to 70 MeV,a small emittance of B0.1 mm mrad,and a low energy spread at a few-percent level can be obtained.These bright MeV-class electron beams have a variety of potential applications,for example,as ultrafast electron probes for diffraction and imaging,in laboratory astrophysics,in coherent radiation source generation,and as injectors for GeV particle accelerators. 展开更多
关键词 WEAKLY nonlinear ACCELERATION
下载PDF
熵工程提高(GeTe)_(x)(AgSb_(0.5)Bi_(0.5)Te_(2))_(1-x)的热电性能和显微硬度 被引量:4
3
作者 钟锦璇 梁格格 +6 位作者 成家回 敖伟琴」 张朝华 李钧钦 刘福生 张胜楠 胡利鹏 《Science China Materials》 SCIE EI CAS CSCD 2023年第2期696-706,共11页
作为一种材料基因特性的内禀属性,构型熵是材料基因组中一个新兴的指征因子.设计具有高构型熵的多组元热电材料,可以通过严重的晶格畸变显著降低晶格热导率,并通过提高晶体对称性改善塞贝克系数.然而,高构型熵也造成了载流子迁移率的恶... 作为一种材料基因特性的内禀属性,构型熵是材料基因组中一个新兴的指征因子.设计具有高构型熵的多组元热电材料,可以通过严重的晶格畸变显著降低晶格热导率,并通过提高晶体对称性改善塞贝克系数.然而,高构型熵也造成了载流子迁移率的恶化,从而限制了zT值的改善.本文通过在众所周知的(GeTe)_(1-x)(AgSbTe_(2))_(x),即TAGS合金中用Bi取代一半的Sb,设计了(GeTe)_(1-x)(AgSb_(0.5)Bi_(0.5)Te_(2))_(x),又称TABGS合金,以证明熵工程的有效性.鉴于TAGS合金的载流子平均自由程较低,已接近Mott-Ioffe-Regel极限,进一步的Bi置换和构型熵增加不会再损害载流子迁移率.此外,通过高构型熵抑制菱方-立方相变和降低的载流子浓度有助于大幅提高Seebeck系数.而且,AgSb_(0.5)Bi_(0.5)Te_(2)合金化诱导的多尺度微观结构和减小的声速有效地抑制了晶格热导率.因此,(GeTe)_(0.80)(AgSb_(0.5)Bi_(0.5)Te_(2))_(0.20)的最高zT值在723 K达到了1.60,300到773 K之间的平均zTave值达到了1.23.同时,由于固溶硬化其室温维氏硬度达到了2.21 GPa.这些结果强调了熵工程在提高热电性能方面的有效性,特别是对大量具有本征低载流子迁移率的材料而言. 展开更多
关键词 载流子迁移率 固溶硬化 热电性能 晶格热导率 晶体对称性 平均自由程 塞贝克系数 材料基因组
原文传递
Inhibiting the bipolar effect via band gap engineering to improve the thermoelectric performance in n-type Bi_(2-x)Sb_(x)Te_(3)for solid-state refrigeration 被引量:2
4
作者 Dongliang Su jiahui cheng +6 位作者 Shan Li Shengnan Zhang Tu Lyu Chaohua Zhang Junqin Li Fusheng Liu Lipeng Hu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第7期50-58,共9页
To date,the benchmark Bi_(2)Te_(3)-based alloys are still the only commercial material system used for ther-moelectric solid-state refrigeration.Nonetheless,the conspicuous performance imbalance between the p-type Bi_... To date,the benchmark Bi_(2)Te_(3)-based alloys are still the only commercial material system used for ther-moelectric solid-state refrigeration.Nonetheless,the conspicuous performance imbalance between the p-type Bi_(2-x)Sb_(x)Te_(3)and n-type Bi_(2)Te_(3-x)Se_(x) legs has become a major obstacle for the improvement of cooling devices to achieve higher efficiency.In our previous study,novel n-type Bi_(2-x)Sb_(x)Te_(3)alloy has been pro-posed via manipulating donor-like effect as an alternative to mainstream n-type Bi_(2)Te_(3-x)Se_(x).However,the narrow bandgap of Bi_(2-x)Sb_(x)Te_(3)provoked severe bipolar effect that constrained the further improvement of zT near room temperature.Herein,we have implemented band gap engineering in n-type Bi_(1.5)Sb_(0.5)Te_(3)by employing isovalent Se substitution to inhibit the undesired intrinsic excitation and achieve the dis-tinguished room-temperature zT.First,the preferential occupancy of Se at Te^(2)site appropriately enlarges the band gap,thereby concurrently improving the Seebeck coefficient and depressing the bipolar thermal conductivity.In addition,the Se alloying mildly suppresses the compensation mechanism and essentially preserves the already optimized carrier concentration,which maintains the peak zT near room tempera-ture.Moreover,the large strain field and mass fluctuation generated by Se alloying leads to the remark-able reduction of lattice thermal conductivity.Accordingly,the zT value of Bi_(1.5)Sb_(0.5)Te_(2.8)Se_(0.2)reaches 1.0 at 300 K and peaks 1.1 at 360 K,which surpasses that of most well-known room-temperature n-type thermoelectric materials.These results pave the way for n-type Bi_(2-x)Sb_(x)Te_(3)alloys to become a new and promising top candidate for large-scale solid-state cooling applications. 展开更多
关键词 Thermoelectric Bi_(2)Te_(3) Band gap Bipolar effect Point defects
原文传递
A Bio-inspired Soft Robotic Arm: Kinematic Modeling and Hydrodynamic Experiments 被引量:6
5
作者 Zheyuan Gong jiahui cheng +6 位作者 Xingyu Chen Wenguang Sun Xi Fang Kainan Hu Zhexin Xie Tianmiao Wang Li Wen 《Journal of Bionic Engineering》 SCIE EI CSCD 2018年第2期204-219,共16页
Soft robotics has several promising properties for aquatic applications, such as safe interaction with environments, lightweight, low cost, etc. In this paper, we proposed the kinematic modeling and hydrodynamics expe... Soft robotics has several promising properties for aquatic applications, such as safe interaction with environments, lightweight, low cost, etc. In this paper, we proposed the kinematic modeling and hydrodynamics experiments of a soft robotic arm with 3D locomotion capacity. We developed a mathematical model that incorporates the angle correction, as well as the open-loop model-based motion control. The model could precisely predict the three-dimensional (3D) movement, and the location error is less than 5.7 mm in different attitudes. Furthermore, we performed the hydrodynamic investigations and simultaneously measured the hydrodynamic forces and the wake flows at different amplitudes (50 mm, 100 mm, 150 mm, 200 mm) and frequencies (0.3 Hz, 0.4 Hz, 0.5 Hz) of the soft arm. Surprisingly, we found that the magnitudes of the hydrodynamic force (〈1 N) and the torques (〈0.08 N-m) of dynamically moving soft arm were tiny, which leads to negligible inertial effect for the underwater vehicle than those of the traditional rigid underwater manipulator. Finally, we demonstrated underwater picking and placing tasks of the soft manipulator by using a computer program that controls the tip attitude and velocity. This study may inspire future underwater manipulators that have properties of low-inertial, low power cost and can safely interact with the aauatic environments. 展开更多
关键词 BIO-INSPIRED soft robotic arm aquatic environment KINEMATICS digital particle image velocimetry
原文传递
A europium(Ⅲ) metal-organic framework as ratiometric turn-on luminescent sensor for Al^(3+) ions 被引量:6
6
作者 Xinhui Zhou jiahui cheng +4 位作者 Liang Li Qiang Chen Yujian You Hongping Xiao Wei Huang 《Science China Materials》 SCIE EI CSCD 2018年第5期752-757,共6页
In recent years, luminescent metal-organic frameworks (MOFs) as a new type of sensing material are receiving enormous attention for their superior performance in chemical sensors and biosensors [1-2]. Taking account... In recent years, luminescent metal-organic frameworks (MOFs) as a new type of sensing material are receiving enormous attention for their superior performance in chemical sensors and biosensors [1-2]. Taking account of the excellent optical properties such as large Stokes shifts and high color purity of lanthanide MOFs (LnMOFs), a great deal of important investigations on LnMOFs have been carried out. And then, their promising abilities in detecting temperature, metal ions, oxygen, explosives and polychlorizated benzenes with high sensitivity and se- lectivity have also been exploited successfuUy [3-22]. Ratiometric luminescent sensors can provide a self-cali- brated analyte concentration readout, which is unaffected by fluctuations of sensor concentration and/or instru- mental parameters. However, it is noticed that a majority of related reports are limited to the detection of analyte using single emission, although ratiometric sensors based on dual-emission are more reliable and accurate than the sensors based on single emission. For ratiometric sensors, not only are two significantly different emissions neces- sary, but two emissions need distinctive response to the analyte. From this point of view, LnMOFs with ligand and Ln3+ emissions are very attractive, because organic ligands and Ln3+ ions as the luminescent centers possess completely different physical and chemical properties and they would produce different interactions with analytes. Thus, LnMOFs have been extensively applied to construct ratiometric sensors recently [3,22]. 展开更多
关键词 光传感器 框架材料 金属有机 铕离子 比率 铝离子 AL^3+ 荧光发射峰
原文传递
A fluorescent Eu(Ⅲ) MOF for highly selective and sensitive sensing of picric acid 被引量:3
7
作者 Qianqian Chen jiahui cheng +5 位作者 Jin Wang Liang Li Zhipeng Liu Xinhui Zhou Yujian You Wei Huang 《Science China Chemistry》 SCIE EI CAS CSCD 2019年第2期205-211,共7页
A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally c... A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized. In EuL,Eu_6O_8 clusters are four-bridged by carboxylates to form parallel-aligned Eu–O–C chains, which are further linked by the carbazole moieties of L^(2-) ligands to form the three-dimensional framework with rhombic channels. The EuL material with characteristic emission of Eu^(3+) ion exhibits significant luminescence quenching response for picric acid(PA) and the linear Stern-Volmer plot was observed in the concentration range of 0.05–0.15 mM with K_(sv) of 98074 M^(-1). As far as we know, this Ksv is among the highest values for COFs and MOFs in detection of PA. The excellent anti-interference ability and repeatability were also verified by experiments. Lastly, we investigated the luminescence quenching mechanism in the EuL sensing system. 展开更多
关键词 EUROPIUM METAL-ORGANIC frameworks picric ACID sensor
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部