Publications by authors named "Shuang Xi"

20 Publications

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Embedded growth of colorful CsPbX3 (X = Cl, Br, I) nanocrystals in metal-organic frameworks at Room Temperature.

Nanotechnology 2022 Jan 13. Epub 2022 Jan 13.

Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Wuhan, 430074, CHINA.

Herein, we develop a novel strategy for preparing all-inorganic cesium lead halide (CsPbX3, X= Cl, Br, I) perovskite nanocrystals (NCs)@Zn-based metal-organic framework (MOF) composites through interfacial synthesis. The successful embedding of fluorescent perovskite NCs in Zn-MOFs is due to the in-situ confined growth, which is attributed to the re-nucleation of water-triggered phase transformation from Cs4PbBr6 to CsPbBr3. The controllable synthesis of mixed-halide based composites with various emission wavelength can be achieved by adding the desired amount of halide (Cl or I) salts in the re-nucleation process. More importantly, the anion exchange reaction is inhibited among various composites with different halogen atoms by being trapped in MOFs. Besides, a white light-emitting diode (WLED) is produced using a blue LED chip with the green-emitting and red-emitting composites, which has a color coordinate of (0.3291, 0.3272) and a wide color gamut. This work provides a novel route to achieving perovskite NCs growth in MOFs, which also can be extended to the other NCs embedded in frames as well.
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http://dx.doi.org/10.1088/1361-6528/ac4b2dDOI Listing
January 2022

Chemical and microbiological characterization of pig manures and digestates.

Environ Technol 2021 Dec 23:1-10. Epub 2021 Dec 23.

Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, People's Republic of China.

Livestock and poultry breeding modes, feed compositions and manure collection systems have regional characteristics, which can directly affect the composition of livestock and poultry breeding manure, energy production by anaerobic digestion and resource utilization of products. The chemical, heavy metal contents and microbiological characteristics of pig manures and digestates were characterized in five pig farms and biogas plants in Quzhou (Zhejiang Province) in this study. The results showed that hemicellulose and cellulose of pig manures could be partly degraded in anaerobic digestion, but lignin was difficultly degraded and accumulated in digestates. The content of Zn was highest in the pig manure and digestate samples, followed by Cu, Cr, As, Ni, Pb, Cd, T1 and Hg. The As content was 16.09-31.22 mg kg in the pig manure and digestate samples, which exceeded the standard limitation requirements in fertilizers in China (≤15 mg kg). , , and dominated in the pig manure and digestate samples, with a relative abundance of 73.6%-99.4%. The microbial community structure in the pig manure samples was quite different among the five farms. The pH, contents of lignin, T1 and As had a significant effect on the microbial community structure in the pig manure samples, while the contents of total phosphorus, NO-N, cellulose and Pb could significantly influence the microbial community structure in the digestate samples. These findings can provide a theoretical basis for recycling manure and improving biogas engineering in large-scale pig farms.
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http://dx.doi.org/10.1080/09593330.2021.2016993DOI Listing
December 2021

Boosting the Performance of Self-Powered CsPbCl-Based UV Photodetectors by a Sequential Vapor-Deposition Strategy and Heterojunction Engineering.

ACS Appl Mater Interfaces 2021 Sep 21;13(38):45744-45757. Epub 2021 Sep 21.

State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.

All-inorganic CsPbCl perovskite in ultraviolet (UV) detection is drawing increasing interest owing to its UV-matchable optical band gap, ultrahigh UV stability, and superior inherent optoelectronic properties. Almost all of the reported CsPbCl photodetectors employ CsPbCl nano- or microstructures as sensitive components, while CsPbCl polycrystalline film-based self-powered photodetectors are rarely studied on account of the terrible precursor solubility. Herein, a novel sequential vapor-deposition technique is demonstrated to fabricate CsPbCl polycrystalline film for the first time. High-quality CsPbCl films with excellent optical, electronic, and morphological features are obtained. A self-powered photodetector based on the CsPbCl film is constructed without any charge transport layer, showing a high UV detection performance. A thin p-type PbS buffer layer is further introduced to passivate the surface defects of the CsPbCl layer and decrease the interfacial energy barrier by forming a type-II heterojunction, contributing to a faster hole extraction rate and a suppressed dark current level. The best-performing device achieves an ultrafast response time of 1.92 μs, an ultrahigh on/off ratio of 2.22 × 10, and a responsivity of 0.22 A/W upon 375 nm UV illumination at 0 V bias. This comprehensive performance is the best among all of the CsPbCl photodetectors reported to date. The as-prepared photodetectors also present an eminent UV irradiation and long-term durability in ambient air. Furthermore, a large-area and uniform 625-pixel UV image sensor is fabricated and attains a prominent imaging capability. Our work opens a new avenue for the scalable production of CsPbCl-based optoelectronics.
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http://dx.doi.org/10.1021/acsami.1c15013DOI Listing
September 2021

High temperature-mediated disturbance of carbohydrate metabolism and gene expressional regulation in rice: a review.

Plant Signal Behav 2021 03 20;16(3):1862564. Epub 2021 Jan 20.

College of Coastal Agricultural Sciences, Guangdong Ocean University , Zhanjiang,China.

Global warming has induced higher frequencies of excessively high-temperature weather episodes, which pose damage risk to rice growth and production. Past studies seldom specified how high temperature-induced carbohydrate metabolism disturbances from both source and sink affect rice fertilization and production. Here we discuss the mechanism of heat-triggered damage to rice quality and production through disturbance of carbohydrate generation and consumption under high temperatures. Furthermore, we provide strong evidence from past studies that rice varieties that maintain high photosynthesis and carbohydrate usage efficiencies under high temperatures will suffer less heat-induced damage during reproductive developmental stages. We also discuss the complexity of expressional regulation of rice genes in response to high temperatures, while highlighting the important roles of heat-inducible post-transcriptional regulations of gene expression. Lastly, we predict future directions in heat-tolerant rice breeding and also propose challenges that need to be conquered in the future.
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http://dx.doi.org/10.1080/15592324.2020.1862564DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7889029PMC
March 2021

[Proteomics analysis of erythrocyte membrane in rats with high altitude polycythemia before and after intervention with salidroside].

Zhongguo Zhong Yao Za Zhi 2020 Oct;45(19):4719-4724

Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine Shanghai 201203, China.

To investigate the effect of salidroside on the proteomics of erythrocyte membrane in high altitude erythrocytosis(HAPC) rats, in order to explore the mechanism of salidroside in improving HAPC based on the proteomics analysis. First, HPAC rat models were established, and 16 rats were randomly divided into HAPC model group and salidroside(100 mg·kg~(-1)) treatment group(8 rats per group). Saline was administered to the HAPC model group, while salidroside treatment group was given 100 mg·kg~(-1) salidroside once a day. After continuous oral administration with salidroside for 40 days(once a day), blood was collected from the femoral artery to obtain total red blood cell membrane proteins. Two-dimensional electrophoresis was used to separate total proteins. The two-dimensional electrophoresis of erythrocyte membrane proteins was analyzed before and after salidroside intervention, and the proteins with significant differences were identified by mass spectrometry. Finally, biological functions were analyzed using bioinformatics. A two-dimensional electrophoresis method was used to establish a protein expression profile with a high resolution and reproducibility of erythrocyte membranes in HAPC rats. Salidroside treatment significantly changed 18 protein spots in the 2-DE map of erythrocyte membranes, of which 13 proteins were up-regulated and 5 proteins were down-regulated. Eight differential proteins were successfully identified by mass spectrometry. Moreover, bioinformatics analysis found that these differential proteins were involved in such biological processes as oxidative stress, redox, and peroxisome pathway, which are mainly associated with peroxisome and MAPK signaling pathways. Therefore, salidroside could significantly change the expressions of erythrocyte membrane proteins in HAPC rats. Eight differential proteins were identified by a proteomic-based approach. The differential proteins were involved in such biological processes as oxidative stress, redox, peroxisome pathway.
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http://dx.doi.org/10.19540/j.cnki.cjcmm.20200323.402DOI Listing
October 2020

[Influence of preparation height and cement space on the fit and retention of computer aided design/computer aided manufacturing zirconia crown].

Hua Xi Kou Qiang Yi Xue Za Zhi 2020 Jun;38(3):263-269

Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases & Dept. of Prothodontics, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China.

Objective: To investigate the effects of preparation height and cement space on the fit and retention of computer aided design (CAD)/computer aided manufacturing (CAM) zirconia crown, and to provide reference for the clinical design and fabrication of CAD/CAM crowns.

Methods: 3D printing system was used to fabricate resin abutment teeth with convergence angle of 2° and height of 1-3 mm. The models' optical impressions were collected by the three-shape scanner. Then, the cement spaces were set by Cradle CAD/CAM system at 10-50 μm to create an all-ceramic zirconia crown. The fit of the crowns was measured by using silicone rubber interstitial impression method. The retention of the crowns was measured by pull-off test with uniaxial tensile force after the crown was bonded. The data were analyzed by SPSS 22.0 soft-ware.

Results: When the preparation height was fixed, the fitness values of different cement space groups have statistical difference (P<
0.05), whereas the retention values of different cement space groups have no statistical difference (P>0.05). The fitness values of different preparation height groups have no statistical difference (P>0.05), and the retention values of different preparation height groups have statistical difference (P<0.05) when the cement space was fixed. No interaction was observed between the cement space and the preparation height (P>0.05).

Conclusions: When cradle CAD/CAM system is used to create a full crown in the clinic, the preparation height should be set to more than 3 mm, and the cement space should be set at 30 μm.
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http://dx.doi.org/10.7518/hxkq.2020.03.006DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7296370PMC
June 2020

Catechins reduce inflammation in lipopolysaccharide-stimulated dental pulp cells by inhibiting activation of the NF-κB pathway.

Oral Dis 2020 May 21;26(4):815-821. Epub 2020 Feb 21.

Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.

Aim: To ascertain the anti-inflammation mechanism of catechins in lipopolysaccharide-treated human dental pulp cells (HDPCs).

Methods: Expression of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6 was measured using quantitative polymerase chain reaction (qPCR) and enzyme-linked immunosorbent assays. The anti-inflammatory mechanism was explored by examining activation of nuclear factor-kappa B (NF-κB) signaling using qPCR, Western blotting, and immunofluorescence staining.

Results: Human dental pulp cells proliferation was not affected by treatment with epigallocatechin (ECG) or epigallocatechin 3-gallate (EGCG). mRNA expression of the pro-inflammatory cytokines TNF-α, IL-1β, and IL-6 was decreased significantly in ECG- and EGCG-treated HDPCs. Subsequently, the effects of ECG and EGCG upon activation of NF-κB signaling were evaluated by Western blotting and immunofluorescence staining. Expression of p-p65 protein in HDPCs treated with ECG, EGCG, or an NF-κB inhibitor (Bay 11-7082) was lower than that in HDPCs treated with lipopolysaccharide, data that were consistent with the location of p65 protein according to immunofluorescence staining.

Conclusions: Catechin could reduce lipopolysaccharide-stimulated inflammation in HDPCs by inhibiting activation of the NF-κB pathway.
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http://dx.doi.org/10.1111/odi.13290DOI Listing
May 2020

Comparison and evaluation of the morphology of crowns generated by biogeneric design technique with CEREC chairside system.

PLoS One 2020 16;15(1):e0227050. Epub 2020 Jan 16.

Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, China.

Objectives: To better guide clinicians to choose the appropriate chairside system, we compared and evaluated the morphology of crowns generated by three different biogeneric design modes (biogeneric copy (BC), biogeneric individual (BI), and biogeneric reference (BR)) of the CEREC software.

Methods: Maxillary and mandibular casts were obtained from twelve volunteers and digital impressions were acquired. All ceramic crown preparations of all right maxillary central incisors were prepared and digital impressions were taken. Then, crowns were automatically designed under BC, BI and BR modes separately and their morphologies were evaluated by six doctors. The "optimal fitting alignment" and "3D analysis" functions of the Geomagic Qualify software were carried out between original teeth and auto-generated full crowns. The auto-generated crowns were modified by a technician according to clinical criteria and the adjustment time was recorded. The discrepancies between technician modified crowns and the auto-generated full crowns were evaluated with the same functions in the Geomagic Qualify software.

Results: The subjective evaluation results of BC group were significantly better than those of BI and BR group (p < 0.05). Compared with the original teeth and modified crowns, auto-generated crowns in BC group all had the smallest differences, followed by BR and BI group (p < 0.05). BC group needed the shortest adjustment time than BI and BR group (p < 0.05).

Conclusions: Using crowns generated by BC mode is more aesthetic and suitable in clinics use than those generated by BI and BR modes and can reduce clinic adjustment time.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0227050PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6964887PMC
April 2020

circRNA CDR1as Regulated the Proliferation of Human Periodontal Ligament Stem Cells under a Lipopolysaccharide-Induced Inflammatory Condition.

Mediators Inflamm 2019 8;2019:1625381. Epub 2019 Sep 8.

Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, China.

circRNA CDR1as (CDR1as) has been demonstrated to play important roles in a variety of inflammation-related diseases by acting as miRNA sponges. The present study is aimed at investigating the potential roles of CDR1as in the proliferation of human periodontal ligament stem cells (PDLSCs) under an inflammatory condition induced by -derived lipopolysaccharide (LPS). Human periodontal ligament cells (PDLCs) were isolated from periodontal ligament tissue, and PDLSCs were sorted from PDLCs based on the STRO-1 expression through fluorescence-activated cell sorting. We further found that CDR1as was significantly downregulated in LPS-treated PDLSCs compared to untreated cells, as well as in normal periodontal ligament tissues compared to periodontitis tissues. Knockdown of CDR1as promoted LPS-induced proliferative inhibition of PDLSCs, whereas overexpression of CDR1as alleviated the LPS-induced proliferative ability of PDLSCs. Mechanistically, CDR1as functioned as an miR-7 sponge to activate the ERK signal pathway to mediate the inhibition effect of LPS on cell proliferation. Taken together, our findings revealed the effects of the interacting pair of CDR1as/miR-7 on the proliferation ability of PDLSCs within their surrounding inflammatory microenvironment of periodontitis.
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http://dx.doi.org/10.1155/2019/1625381DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6754938PMC
March 2020

Cost-Effective Fabrication of Inner-Porous Micro/Nano Carbon Structures.

J Nanosci Nanotechnol 2018 Mar;18(3):2089-2095

School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China.

This paper reports the fabrication of a new micro/nano carbon architecture array which owns the characteristics of inner-porous, desired conductivity and large effective surface area. The micro/nano inner-porous carbon structures were fabricated for the first time, with ordinary and cost-effective processes, including photolithography, oxygen plasma etching and pyrolysis. Firstly, micro/nano hierarchical photoresist structures array was generated through photolithography and oxygen plasma etching processes. By introducing a critical thin-film spin-coating step, and followed with carefully pyrolyzing process, the micro/nano photoresist structures were converted into innerporous carbon architectures with good electric connection which connected the carbon structures array together. Probably the inner-porous property can be attributed to the shrinkage difference between positive thin film and negative photoresist structures during pyrolyzing process. It is demonstrated that the simple method is effective to fabricate inner-porous carbon structures with good electric connection and the carbon structures can be used as electrochemical electrodes directly and without the addition of other pyrolysis or film coating processes. The electrochemical property of the carbon structures has been explored by cyclic voltammetric measurement. Compared with solid carbon microstructures array, the cyclic voltammetry curve of inner-porous carbon structures shows greatly enhanced current and improved charge-storage capability, indicating great potential in micro energy storage devices and bio-devices.
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http://dx.doi.org/10.1166/jnn.2018.14256DOI Listing
March 2018

Treatment of refractory contaminants by sludge-derived biochar/persulfate system via both adsorption and advanced oxidation process.

Chemosphere 2017 Oct 17;185:754-763. Epub 2017 Jul 17.

Department of Environmental Engineering, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address:

A novel strategy for the removal of refractory organic contaminants was realized through sludge-derived biochar (SDBC)/persulfate (PS) system via both adsorption and advanced oxidation process under ambient conditions. SDBC was prepared by one single step of slow pyrolysis of municipal sewage sludge, appeared a porous structure, and contained abundant oxygen-containing functional groups as well as amorphous Fe species. Large surface area and porous structure of SDBC benefitted the adsorption and enrichment of contaminants, while oxygen-containing functional groups and Fe species on the surface were considered as reactive components for the activation of PS. Under conditions of [PS] = 1.85 mM, [4-chlorophenol] = 0.039 mM, [SDBC] = 1 g L, pH = 6.30 and temperature = 25 °C, the removal of model compound of 4-chlorophenol achieved 92.3%, and this significant performance of SDBC/PS system was consistent in a broad pH window. Radical scavengers and electron paramagnetic resonance (EPR) studies suggested that SDBC successfully activated PS to produce various oxidative radicals. Meanwhile, recycle experiments and Fe leaching tests further demonstrated the stability of SDBC during the activation of PS. Municipal landfill leachate effluent through a membrane bio-reactor was testified as the refractory real wastewater, in which both the removal of total organic carbon and ammonia was significant. Thus, SDBC showed certain advantages in PS activation such as feasible preparation method, remarkable efficiency and stability. These advantages proved SDBC/PS system as an effective strategy of controlling waste by waste, and implicated its potential application in full-scale for the treatment of refractory organic contaminants.
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http://dx.doi.org/10.1016/j.chemosphere.2017.07.084DOI Listing
October 2017

Facile Synthesis of Free-Standing NiO/MnO Core-Shell Nanoflakes on Carbon Cloth for Flexible Supercapacitors.

Nanoscale Res Lett 2017 Dec 7;12(1):171. Epub 2017 Mar 7.

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.

Free-standing NiO/MnO core-shell nanoflake structure was deposited on flexible carbon cloth (CC) used as electrode for high-performance supercapacitor (SC). The NiO core was grown directly on CC by hydrothermal process and the following annealing treatment. MnO thin film was then covered on NiO structures via a self-limiting process in aqueous solution of 0.5 M KMnO and 0.5 M NaSO with a carbon layer serving as the sacrificial layer. Both the core and shell materials are good pseudocapacitive materials, the compounds of binary metal oxides can provide the synergistic effect of all individual constituents, and thus enhance the performance of SC electrode. The obtained CC/NiO/MnO heterostructure was directly used as SC electrodes, showing an enhanced electrochemical performance including areal capacitance of 316.37 mF/cm and special gravimetric capacitance of 204.3 F/g at the scan rate of 50 mV/s. The electrode also shows excellent cycling stability, which retains 89% of its initial discharge capacitance after 2200 cycles with >97% Coulombic efficiency. The synthesized binder-free hierarchical composite electrode with superior electrochemical properties demonstrates enormous potential in the application of flexible SCs.
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http://dx.doi.org/10.1186/s11671-017-1939-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5340741PMC
December 2017

Immobilization of Cd in landfill-leachate-contaminated soil with cow manure compost as soil conditioners: A laboratory study.

J Air Waste Manag Assoc 2016 12;66(12):1276-1283

a School of Environmental Science & Engineering , Huazhong University of Science and Technology , Wuhan , PR China.

Introducing cow manure compost as an amendment in landfill-leachate-contaminated soils is proved to be an effective technique for the immobilization of Cd in this study. Landfill-leachate-contaminated soil was collected from an unlined landfill in China and amended with a different blending quantity of cow manure compost (0, 12, 24, 36, and 48 g per 200 g soil), which was made by mixing cow manure and chaff at a ratio of 1/1 and maturing for 6 months. pH values of five different blending quantity mixtures increased by 0.2-0.4, and the organic matter levels increased by 2.5-7%, during a remediation period of 5 weeks. Four fractions of Cd named exchangeable Cd, reducible Cd, oxidizable Cd, and residual Cd in soil were respectively analyzed by a sequential extraction procedure. Introducing the cow manure compost application resulted in more than 40% lower exchangeable Cd but a higher concentration of oxidizable Cd in soils, and mass balance results showed nearly no Cd absorption by applied material, indicating that transformation of exchangeable Cd into oxidization forms was the main mechanism of Cd immobilization when cow manure compost was used as an amendment. The Pearson correlation showed that increasing of pH values significantly improved the efficiency of Cd immobilization, with a correlation coefficiency of 0.940 (p < 0.05). This is the first attempt at heavy metal immobilization in landfill-leachate-contaminated soil by cow manure compost, and findings of this work can be integrated to guide the application.

Implications: Addition of cow manure compost (CMC) was effective in reducing exchangeable Cd in landfill-leachate-contaminated soils (LLCS). The immobilization effect of Cd was mainly assigned to the redistribution of labile soil Cd. Organic matter (OM) and pH value increased with CMC application. The pH values were more sensitive to Cd immobilization efficiency. It was proved that CMC can be safely and effectively used for the restoration of LLCS.
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http://dx.doi.org/10.1080/10962247.2016.1218976DOI Listing
December 2016

Spinal cord injury in rats treated using bone marrow mesenchymal stem-cell transplantation.

Int J Clin Exp Med 2015 15;8(6):9348-54. Epub 2015 Jun 15.

The No. 208 Hospital of The People's Liberation Army Changchun 130062, China.

The aim of this study was to observe the effects of bone marrow mesenchymal stem-cell transplantation (BMSCs) in repairing acute spinal cord damage in rats and to examine the potential beneficial effects. 192 Wistar rats were randomized into 8 groups. Spinal cord injury was created. Behavior and limb functions were scored. Repairing effects of BMSCs transplantation was evaluated and compared. In vitro 4',6-diamidino-2-phenylindole (DAPI)-tagged BMSCs were observed, and whether they migrated to the area of spinal cord injury after intravenous tail injection was investigated. The expression of neuron-specific protein (NSE) on BMSCs was examined. Fifteen days after transplantation, the BMSCs-treated groups scored significantly higher in limb function tests than the untreated group. Pathological sections of the bone marrow after operation showed significant recovery in treated groups in comparison to the control group. After transplantation, small amounts of fluorescent-tagged BMSCs can be found in the blood vessels in the area of spinal cord injury, and fluorescent-tagged BMSCs were diffused in extravascular tissues, whereas the DAPI-tagged BMSCs could not be detected,and BrdU/NSE double-labeled cells were found in the injured marrow. BMSCs improve behavioral responses and can repair spinal cord injuries by migrating to the injured area, where they can differentiate into neurons.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4538186PMC
August 2015

Growth of hierarchal mesoporous NiO nanosheets on carbon cloth as binder-free anodes for high-performance flexible lithium-ion batteries.

Sci Rep 2014 Dec 10;4:7413. Epub 2014 Dec 10.

1] State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China [2] Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

Mesoporous NiO nanosheets were directly grown on three-dimensional (3D) carbon cloth substrate, which can be used as binder-free anode for lithium-ion batteries (LIBs). These mesoporous nanosheets were interconnected with each other and forming a network with interval voids, which give rise to large surface area and efficient buffering of the volume change. The integrated hierarchical electrode maintains all the advantageous features of directly building two-dimensional (2D) nanostructures on 3D conductive substrate, such as short diffusion length, strain relaxation and fast electron transport. As the LIB anode, it presents a high reversible capacity of 892.6 mAh g(-1) after 120 cycles at a current density of 100 mA g(-1) and 758.1 mAh g(-1) at a high charging rate of 700 mA g(-1) after 150 cycles. As demonstrated in this work, the hierarchical NiO nanosheets/carbon cloth also shows high flexibility, which can be directly used as the anode to build flexible LIBs. The introduced facile and low-cost method to prepare NiO nanosheets on flexible and conductive carbon cloth substrate is promising for the fabrication of high performance energy storage devices, especially for next-generation wearable electronic devices.
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http://dx.doi.org/10.1038/srep07413DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4261184PMC
December 2014

Concentration gradient induced morphology evolution of silica nanostructure growth on photoresist-derived carbon micropatterns.

Nanoscale Res Lett 2012 Sep 3;7(1):496. Epub 2012 Sep 3.

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.

The evolution of silica nanostructure morphology induced by local Si vapor source concentration gradient has been investigated by a smart design of experiments. Silica nanostructure or their assemblies with different morphologies are obtained on photoresist-derived three-dimensional carbon microelectrode array. At a temperature of 1,000°C, rope-, feather-, and octopus-like nanowire assemblies can be obtained along with the Si vapor source concentration gradient flow. While at 950°C, stringlike assemblies, bamboo-like nanostructures with large joints, and hollow structures with smaller sizes can be obtained along with the Si vapor source concentration gradient flow. Both vapor-liquid-solid and vapor-quasiliquid-solid growth mechanisms have been applied to explain the diverse morphologies involving branching, connecting, and batch growth behaviors. The present approach offers a potential method for precise design and controlled synthesis of nanostructures with different features.
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http://dx.doi.org/10.1186/1556-276X-7-496DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3479050PMC
September 2012

Growth of highly bright-white silica nanowires as diffusive reflection coating in LED lighting.

Opt Express 2011 Dec;19(27):26507-14

State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, China.

Large quantities of silica nanowires were synthesized through thermal treatment of silicon wafer in the atmosphere of N(2)/H(2)(5%) under 1200 °C with Cu as catalyst. These nanowires grew to form a natural bright-white mat, which showed highly diffusive reflectivity over the UV-visible range, with more than 60% at the whole range and up to 88% at 350 nm. The utilization of silica nanowires in diffusive coating on the reflector cup of LED is demonstrated, which shows greatly improved light distribution comparing with the specular reflector cup. It is expected that these nanowires can be promising coating material for optoelectronic applications.
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http://dx.doi.org/10.1364/OE.19.026507DOI Listing
December 2011

Carbonization-assisted integration of silica nanowires to photoresist-derived three-dimensional carbon microelectrode arrays.

Nanotechnology 2011 Nov 25;22(46):465601. Epub 2011 Oct 25.

State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

We propose a novel technique of integrating silica nanowires to carbon microelectrode arrays on silicon substrates. The silica nanowires were grown on photoresist-derived three-dimensional carbon microelectrode arrays during carbonization of patterned photoresist in a tube furnace at 1000 °C under a gaseous environment of N(2) and H(2) in the presence of Cu catalyst, sputtered initially as a thin layer on the structure surface. Carbonization-assisted nucleation and growth are proposed to extend the Cu-catalyzed vapor-liquid-solid mechanism for the nanowire integration behaviour. The growth of silica nanowires exploits Si from the etched silicon substrate under the Cu particles. It is found that the thickness of the initial Cu coating layer plays an important role as catalyst on the morphology and on the amount of grown silica nanowires. These nanowires have lengths of up to 100 µm and diameters ranging from 50 to 200 nm, with 30 nm Cu film sputtered initially. The study also reveals that the nanowire-integrated microelectrodes significantly enhance the electrochemical performance compared to blank ones. A specific capacitance increase of over 13 times is demonstrated in the electrochemical experiment. The platform can be used to develop large-scale miniaturized devices and systems with increased efficiency for applications in electrochemical, biological and energy-related fields.
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http://dx.doi.org/10.1088/0957-4484/22/46/465601DOI Listing
November 2011

Carbon-assisted growth and high visible-light optical reflectivity of amorphous silicon oxynitride nanowires.

Nanoscale Res Lett 2011 Jul 25;6:469. Epub 2011 Jul 25.

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

Large amounts of amorphous silicon oxynitride nanowires have been synthesized on silicon wafer through carbon-assisted vapor-solid growth avoiding the contamination from metallic catalysts. These nanowires have the length of up to 100 μm, with a diameter ranging from 50 to 150 nm. Around 3-nm-sized nanostructures are observed to be homogeneously distributed within a nanowire cross-section matrix. The unique configuration might determine the growth of ternary amorphous structure and its special splitting behavior. Optical properties of the nanowires have also been investigated. The obtained nanowires were attractive for their exceptional whiteness, perceived brightness, and optical brilliance. These nanowires display greatly enhanced reflection over the whole visible wavelength, with more than 80% of light reflected on most of the wavelength ranging from 400 to 700 nm and the lowest reflectivity exceeding 70%, exhibiting performance superior to that of the reported white beetle. Intense visible photoluminescence is also observed over a broad spectrum ranging from 320 to 500 nm with two shoulders centered at around 444 and 468 nm, respectively.
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http://dx.doi.org/10.1186/1556-276X-6-469DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211981PMC
July 2011

Na+/H+ exchanger inhibitor prevented endothelial dysfunction induced by high glucose.

J Cardiovasc Pharmacol 2005 Jun;45(6):586-90

Department of Pharmacology, Xiang-Ya Medical College, Central South University, Hunan, People's Republic of China.

The aims of this study were to examine whether cariporide, a selective Na+/H+ exchanger inhibitor, has protective effects against endothelial dysfunction induced by high glucose in vitro and to investigate the potential mechanisms. Exposure of rat aorta rings to high glucose (44 mmol/L) for 6 hours caused an inhibition of acetylcholine-induced endothelium-dependent relaxation but had no effect on sodium nitroprusside-induced endothelium-independent relaxation. Treatment with cariporide (0.01, 0.1, 1 micromol/L) of aortic rings incubated with high-glucose medium attenuated the impaired endothelium-dependent relaxation in a dose-dependent manner. Furthermore, high glucose resulted in an increase of malondialdehyde and a decrease of superoxide dismutase activity in rat aorta rings, and these effects were reversed by cariporide. In addition, cariporide was able to inhibit the activation of Na+/H+ exchanger induced by high glucose in cultured endothelial cells. These findings suggest that the endothelial dysfunction induced by high glucose in vitro is caused by the activation of Na+/H+ exchanger.
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http://dx.doi.org/10.1097/01.fjc.0000161401.14327.38DOI Listing
June 2005
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