Publications by authors named "Jianyun Zheng"

17 Publications

  • Page 1 of 1

Activated Ni-OH Bonds in a Catalyst Facilitates the Nucleophile Oxidation Reaction.

Adv Mater 2022 Apr 26:e2105320. Epub 2022 Apr 26.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, P. R. China.

The nucleophile oxidation reaction (NOR) is of enormous significance for organic electrosynthesis and coupling for hydrogen generation. However, the nonuniform NOR mechanism limits its development. For the NOR, involving electrocatalysis and organic chemistry, both the electrochemical step and non-electrochemical process should be taken into account. The NOR of nickel-based hydroxides includes the electrogenerated dehydrogenation of the Ni -OH bond and a spontaneous non-electrochemical process; the former determines the electrochemical activity, and the nucleophile oxidation pathway depends on the latter. Herein, the space-confinement-induced synthesis of Ni Fe layered double hydroxide intercalated with single-atom-layer Pt nanosheets (Ni Fe LDH-Pt NS) is reported. The synergy of interlayer Pt nanosheets and multiple defects activates Ni-OH bonds, thus exhibiting an excellent NOR performance. The spontaneous non-electrochemical steps of the NOR are revealed, such as proton-coupled electron transfer (PCET; Ni -O + X-H = Ni -OH + X ), hydration, and rearrangement. Hence, the reaction pathway of the NOR is deciphered, which not only helps to perfect the NOR mechanism, but also provides inspiration for organic electrosynthesis.
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http://dx.doi.org/10.1002/adma.202105320DOI Listing
April 2022

Advanced Zn-I Battery with Excellent Cycling Stability and Good Rate Performance by a Multifunctional Iodine Host.

ACS Appl Mater Interfaces 2022 Feb 11;14(7):8955-8962. Epub 2022 Feb 11.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China.

The rechargeable zinc-iodine (Zn-I) battery is a promising energy-storage system due to its low cost and good security, but the practical use of the battery is largely constrained by the shuttle effect and high dissolvability of iodides. Here a multifunctional iodine host, constructed with nitrogen-doped porous carbon nanocages (NCCs) by the polymerization carbonization activation method, is exploited to improve the electrochemical performance and lifespan of the Zn-I battery, achieving a high specific capacity of 259 mAh g, a good rate performance (maintaining 50.6% expanding 50 times), and a high cycle stability (retention of 100% after 1000 cycles). On the basis of the experimental results and theoretical calculations, NCCs via the introduction of N doping and nanosized porous structure can simultaneously provide rich and robust anchoring and catalytic sites to carry out the electrostatic adsorption of iodides and facilitate the reversible conversion between iodine and iodides. This work shows a novel and efficient strategy to develop high-performance and long-life Zn-I batteries.
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http://dx.doi.org/10.1021/acsami.1c21026DOI Listing
February 2022

Identifying the Intrinsic Relationship between the Restructured Oxide Layer and Oxygen Evolution Reaction Performance on the Cobalt Pnictide Catalyst.

Small 2020 Apr 12;16(14):e1906867. Epub 2020 Mar 12.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China.

Cobalt pnictides show good catalytic activity and stability on oxygen evolution reaction (OER) behaviors in a strong alkaline solution. Identifying the intrinsic composition/structure-property relationship of the oxide layer on the cobalt pnictides is critical to design better and cheaper electrocatalysts for the commercial viability of OER technologies. In this work, the restructured oxide layer on the cobalt pnictides and its effect on the activity and mechanism for OER is systematically analyzed. In-situ electrochemical impedance spectroscopy (EIS) and near edge x-ray absorption fine structure (NEXAFS) spectra indicate that a higher OER performance of cobalt pnictides than Co O is attributed to the more structural disorder and oxygen defect sites in the cobalt oxide layer evolved from cobalt pnictides. Using angle resolved x-ray photoelectron spectroscopy (AR-XPS) further demonstrates that the oxygen defect sites mainly concentrate on the subsurface of cobalt oxide layer. The current study demonstrated promising opportunities for further enhancing the OER performance of cobalt-based electrocatalysts by controlling the subsurface defects of the restructured active layer.
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http://dx.doi.org/10.1002/smll.201906867DOI Listing
April 2020

Tuning the Electron Localization of Gold Enables the Control of Nitrogen-to-Ammonia Fixation.

Angew Chem Int Ed Engl 2019 Dec 4;58(51):18604-18609. Epub 2019 Nov 4.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China.

The (photo)electrochemical N reduction reaction (NRR) provides a favorable avenue for the production of NH using renewable energy in mild operating conditions. Understanding and building an efficient catalyst with high NH selectivity represents an area of intense interest for the early stages of development for NRR. Herein, we introduce a CoO layer to tune the local electronic structure of Au nanoparticles with positive valence sites for boosting conversion of N to NH . The catalysts, possessing high average oxidation states (ca. 40 %), achieve a high NH yield rate of 15.1 μg cm  h and a good faradic efficiency of 19 % at -0.5 V versus reversible hydrogen electrode. Experimental results and simulations reveal that the ability to tune the oxidation state of Au enables the control of N adsorption and the concomitant energy barrier of NRR. Altering the Au oxidation state provides a unique strategy for control of NRR in the production of valuable NH .
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http://dx.doi.org/10.1002/anie.201909477DOI Listing
December 2019

Gefitinib suppresses cervical cancer progression by inhibiting cell cycle progression and epithelial-mesenchymal transition.

Exp Ther Med 2019 Sep 9;18(3):1823-1830. Epub 2019 Jul 9.

Department of Gynaecology and Obstetrics, Puyang Oil Field General Hospital, Puyang, Henan 457001, P.R. China.

Cervical cancer (CC) is the second most common malignant cancer among women. Gefitinib was one of the first-generation epidermal growth factor receptor-tyrosine kinase inhibitors in clinical trials. However, the underlying mechanism of gefitinib in regulating CC progression remains unknown. In the current study, two CC cell lines, HeLa and Siha, were used to investigate the effects of gefitinib. Cell counting kit-8 assays demonstrated that treatment with gefitinib exerted strong cytotoxicity in HeLa and Siha cells. Flow cytometry was used to examine cell cycle progression and apoptosis. Treatment with gefitinib enhanced the number of cells in the G/G phase and increased apoptosis in HeLa and Siha cells. Furthermore, treatment with gefitinib decreased the protein expression level of Bcl-2 and increased the protein expression level of Bax. Taken together, these results suggest that gefitinib may suppress CC cell proliferation and induce cell cycle arrest and apoptosis. The current study also demonstrated that treatment with gefitinib suppressed epithelial-mesenchymal transition (EMT) as the expression level of the epithelial marker, E-cadherin was increased, while the expression level of the mesenchymal marker, vimentin was decreased. The current study demonstrated that treatment with gefitinib decreased the protein expression levels of phosphorylated-GSK3β and β-catenin, which suggests that gefitinib may be a potential novel therapeutic strategy in CC by suppressing the Wnt/β-catenin signaling pathway and EMT to inhibit tumor metastasis in CC cells. In conclusion, gefitinib may suppress the EMT process during cell invasion and induce cell apoptosis and cell cycle arrest via inhibition of the Wnt/β-catenin signaling pathway.
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http://dx.doi.org/10.3892/etm.2019.7754DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6676113PMC
September 2019

UPF1 inhibits the hepatocellular carcinoma progression by targeting long non-coding RNA UCA1.

Sci Rep 2019 04 30;9(1):6652. Epub 2019 Apr 30.

Department of Gastroenterology, The First Affiliated Hospital of Xi'an Medical University, Xi'an, China.

Hepatocellular carcinoma (HCC) is one of the major causes of cancer-related death worldwide. However, the molecular mechanism underlying HCC carcinogenesis remains to be further elucidated. Up-frameshift protein 1 (UPF1) is a RNA/DNA-dependent ATPase and ATP-dependent RNA helicase. Here, we explored the expression and function of UPF1 in HCC. In this study, we demonstrated that UPF1 expression was significantly reduced in hepatocellular carcinoma (HCC) tissues compared with the adjacent normal tissues. And further functional assays revealed that knockdown of UPF1 promoted HCC cells growth and invasion. Furthermore, we found that UPF1 could bind to long non-coding RNA urothelial cancer associated 1 (UCA1) and was negatively correlated with UCA1. UCA1 expression also affected HCC growth and invasion. Knockdown of UCA1 ameliorated the effect of UPF1 knock down on HCC growth and invasion. Knockdown of UPF1 enhances glycolysis in HCC. Taken together, our results provided new insights for finding novel therapeutic targets for hepatocellular carcinoma progression.
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http://dx.doi.org/10.1038/s41598-019-43148-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6491801PMC
April 2019

The clinical and prognostic significance of YWHAZ in non-small-cell lung cancer patients: Immunohistochemical analysis.

J Cell Biochem 2019 04 30;120(4):6290-6298. Epub 2018 Oct 30.

Department of Respiratory Medicine, The Second Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang, China.

YWHAZ has been suggested to as an oncogene in various human malignancies, including non-small-cell lung cancer (NSCLC). Our study presents more evidence to confirm the clinical significance and biological function of YWHAZ in NSCLC. In our results, YWHAZ was upregulated in lung squamous cell carcinoma tissues and lung adenocarcinoma tissues through analyzing The Cancer Genome Atlas (TCGA) database, and confirmed high levels of YWHAZ messenger RNA and protein in lung squamous cell carcinoma tissues and lung adenocarcinoma tissues through quantitative real-time polymerase chain reaction and immunohistochemistry. Moreover, YWHAZ overexpression was correlated with advanced clinical stage, more lymph node metastasis and present distant metastasis in NSCLC patients. Survival analysis indicated that high level of YWHAZ protein expression was associated with short overall survival time in NSCLC patients, and YWHAZ expression was independent prognostic factors for overall survival in NSCLC patients. Moreover, Silencing of YWHAZ expression represses NSCLC cell migration and invasion. In conclusion, YWHAZ is a credible prognostic biomarker, and may be a therapeutic target in NSCLC.
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http://dx.doi.org/10.1002/jcb.27915DOI Listing
April 2019

Crystalline TiO protective layer with graded oxygen defects for efficient and stable silicon-based photocathode.

Nat Commun 2018 09 3;9(1):3572. Epub 2018 Sep 3.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China.

The trade-offs between photoelectrode efficiency and stability significantly hinder the practical application of silicon-based photoelectrochemical devices. Here, we report a facile approach to decouple the trade-offs of silicon-based photocathodes by employing crystalline TiO with graded oxygen defects as protection layer. The crystalline protection layer provides high-density structure and enhances stability, and at the same time oxygen defects allow the carrier transport with low resistance as required for high efficiency. The silicon-based photocathode with black TiO shows a limiting current density of ~35.3 mA cm and durability of over 100 h at 10 mA cm in 1.0 M NaOH electrolyte, while none of photoelectrochemical behavior is observed in crystalline TiO protection layer. These findings have significant suggestions for further development of silicon-based, III-V compounds and other photoelectrodes and offer the possibility for achieving highly efficient and durable photoelectrochemical devices.
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http://dx.doi.org/10.1038/s41467-018-05580-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6120862PMC
September 2018

Defect-Enhanced Charge Separation and Transfer within Protection Layer/Semiconductor Structure of Photoanodes.

Adv Mater 2018 Aug 19;30(31):e1801773. Epub 2018 Jun 19.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China.

Silicon (Si) requires a protection layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in protection layer/Si photoanodes that reduce their water-splitting efficiency. Here, a simultaneous enhancement of charge separation and transfer in Nb-doped NiO /Ni/black-Si photoanodes induced by plasma treatment is reported. The optimized photoanodes yield the highest charge-separation efficiency (η ) of ≈81% at 1.23 V versus reversible hydrogen electrode, corresponding to the photocurrent density of ≈29.1 mA cm . On the basis of detailed characterizations, the concentration and species of oxygen defects in the NiO -based layer are adjusted by synergistic effect of Nb doping and plasma treatment, which are the dominating factors for forming suitable band structure and providing a favorable hole-migration channel. This work elucidates the important role of oxygen defects on charge separation and transfer in the protection layer/Si-based photoelectrochemical systems and is encouraging for application of this synergistic strategy to other candidate photoanodes.
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http://dx.doi.org/10.1002/adma.201801773DOI Listing
August 2018

Mesostructured perovskite solar cells based on highly ordered TiO network scaffold via anodization of Ti thin film.

Nanotechnology 2017 Feb 28;28(5):055403. Epub 2016 Dec 28.

State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Dingxi, 1295, Changning, Shanghai, 200050, People's Republic of China. University of Chinese Academy of Sciences, Yuquan 19, Shijingshan, Beijing, 100049, People's Republic of China.

An anodized TiO interconnected network was fabricated and utilized as a mesoporous scaffold and electron transporter in perovskite solar cells. By modifying the synthesis parameters, the morphological features of the interconnected TiO nanostructures can be widely tuned and precisely controlled. The functional properties of the anodized TiO network are found to be severely influenced by morphology as well as the extent of oxidation. The device with the optimized TiO network exhibits superior electron extraction and transferability, resulting in conspicuous enhancement of the photocurrent and power conversion efficiency (PCE). This work proposes a promising and facile method for improving the performance of perovskite solar cells.
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http://dx.doi.org/10.1088/1361-6528/aa5172DOI Listing
February 2017

Vanadium Dioxide Nanoparticle-based Thermochromic Smart Coating: High Luminous Transmittance, Excellent Solar Regulation Efficiency, and Near Room Temperature Phase Transition.

ACS Appl Mater Interfaces 2015 Dec 9;7(50):27796-803. Epub 2015 Dec 9.

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai institute of Ceramics, Chinese Academy of Sciences , Dingxi 1295, Changning, Shanghai, 200050, China.

An annealing-assisted preparation method of well-crystallized VxW1-xO2(M)@SiO2 core-shell nanoparticles for VO2-based thermochromic smart coatings (VTSC) is presented. The additional annealing process reduces the defect density of the initial hydrothermally prepared VxW1-xO2(M) nanoparticles and enhances their crystallinity so that the thermochromic film based on VxW1-xO2(M)@SiO2 nanoparticles can exhibit outstanding thermochromic performance with balanced solar regulation efficiency (ΔTsol) of 17.3%, luminous transmittance (Tlum) up to 52.2%, and critical phase transition temperature (Tc) around 40.4 °C, which is very promising for practical application. Furthermore, it makes great progress in reducing Tc of VTSC to near room temperature (25.2 °C) and simutaneously maintaining excellent optical properties (ΔTsol = 14.7% and Tlum = 50.6%). Such thermochromic performance is good enough to make VTSC applicable to practical architecture.
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http://dx.doi.org/10.1021/acsami.5b09011DOI Listing
December 2015

Detecting of gastric cancer by Bcl-2 and Ki67.

Int J Clin Exp Pathol 2015 1;8(6):7287-90. Epub 2015 Jun 1.

School of Nursing of Xi'an Medical University Xi'an, China.

Gastric cancer is one of the most common malignant tumors and the second leading cause of cancer-related deaths in China. Although there is some progress in diagnose and treatment, the incidence of gastric cancer still keeps up increasing. In this study 40 patients with gastric cancer who underwent surgical operation is detected by immunohistochemistry. The positive rates of Bcl-2 and Ki67 protein expression in gastric cancer tissues were significantly higher than normal gastric mucous tissues. Correlation analysis showed that the expression of Bcl-2 is not correlated with that of Ki67. Positive expression of Bcl-2 or Ki67 did not correlate with age, gender, differentiation, stage and lymph node metastasis. These suggested that combination of Bcl-2 and Ki67 to detect gastric cancer is more effective.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525963PMC
May 2016

Downregulation of survivin inhibits proliferation and migration of human gastric carcinoma cells.

Int J Clin Exp Pathol 2015 1;8(2):1731-6. Epub 2015 Feb 1.

Department of Pathology, The Affiliated Hospital, Xi'an Medical University Xi'an, China.

Gastric cancer is the second leading cause of cancer-related death worldwide. Survivin overexpressed in many human cancers as a member of the inhibitor of apoptosis protein family. We found that all samples of normal gastric tissues did not express the protein of survivin, and however, 65% human gastric cancer samples expressed survivin. Positive expression of survivin correlated with differentiation. The proliferation and migration of gastric cancer decreased after downregulation of surviving by RNA interference. Furthermore, downregulation of survivin caused the cell cycle arrest. These suggest that survivin play an important role in gastric cancer and the use of survivin siRNA might become an effective approach to cancer therapy.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4396289PMC
February 2016

[Comparison of the risk factors for asthma in children between urban and rural areas in Fuzhou City].

Zhonghua Er Ke Za Zhi 2014 Apr;52(4):282-6

Department of Allergy, Children's Hospital of Fuzhou, Teaching Hospital of Fujian Medical University, Fuzhou 350005, China.

Objective: To explore the prevalence and the different risk factors for asthma in children between urban and rural areas in Fuzhou, Fujian province.

Method: The epidemiological survey of asthma in 0-14 years old children was conducted from October 2009 to October 2010 between Fuzhou urban and rural areas in Fujian province. The investigation subjects were selected in urban and rural areas by phased stratified random cluster sampling. The 2010 third national epidemiological survey questionnaire of children with asthma was used for screening for possible patients. Diagnosis of asthma was confirmed by physical examination. The children with asthma were designated as the positive cases, while non asthmatic children who were age, gender, ethnic, and living environment matched with asthmatic patients were designated as negative control. Comparison of the prevalence of asthma in children between Fuzhou urban and rural areas was performed. The influencing factors of asthma were analyzed and screened by the regression equation model of two element Logistic regression.

Result: Totally 12 235 questionnaires of children with asthma and allergic disease screening were issued and 11 738 questionnaire were sent back (6 221 were male and 5 517 were female). The return rate was 95.9% in urban Fuzhou; 648 children were diagnosed as asthma. The prevalence of asthma in male was 6.48% and female children was 4.44% (comparison of the prevalence of gender χ(2) = 23.267, P < 0.001) in urban areas . A total of 6 000 questionnaires of children with asthma and allergic disease screening were sent out and 5 860 were responded (male children 3 228, female children 2 632). The recovery rate was 97.7% in rural Fuzhou; 135 children with asthma was diagnosed. The prevalence of asthma in male was 2.73%and female children and was 1.79%. Adding protein supplement before 6 months (OR = 1.908, 95%CI:1.233-2.959), the use of antibiotics in the treatment of asthma (OR = 14.541, 95%CI:8.920-23.705), furniture materials (non wood) (OR = 2.432, 95%CI:1.563-3.785) were the main risk factors of children with asthma in urban. Adding protein supplement before 6 months(OR = 3.021, 95%CI:1.357-6.711), the use of antibiotics in the treatment of asthma(OR = 14.784, 95%CI:3.842-56.885), the use of coal as fuel (OR = 63.339, 95% CI: 7.993-501.943), domesticated livestock (OR = 13.659, 95% CI:1.342-139.068), the family smoking before and after birth (OR = 6.226, 95%CI:2.674-14.495) and chemical fiber pillow (OR = 3.638, 95%CI:1.241-10.666) were the main risk factors of children with asthma in rural areas.

Conclusion: The prevalence of children with asthma in urban areas was higher than that in rural areas. The prevalence of asthma in male children was higher than in female children. Adding protein food supplement before 6 months, the use of antibiotics and non solid wood furniture material were the main risk factors in children with asthma in urban areas. Adding protein supplement before 6 months, the use of antibiotics, domesticated livestock, the use of coal as fuel and the family smoking before and after birth were the main risk factor of asthma in children in rural areas.
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April 2014

[Neurogenesis in the dentate gyrus of the hippocampus in a rat model of intracerebral hemorrhage].

Nan Fang Yi Ke Da Xue Xue Bao 2013 Oct;33(10):1437-41

Department of Human Anatomy, Xi'an Medical University, Xi'an 710021, China. E-mail:

Objective: To investigate whether intracerebral hemorrhage (ICH) can promote neurogenesis in the dentate gyrus (DG) of rat hippocampus.

Methods: Western blot analysis, immunohistochemical staining, and immunofluorescent double labeling combined with confocal microscope were used to detect neurogenesis in the DG of the hippocampus in rats after ICH.

Results: The expression of DCX protein in the ipsilateral DG of the hippocampus was enhanced in the rats 1 day after ICH (0.202∓0.062) as compared with that in normal rats (0.127∓0.088), reaching the peak level at 14 days (0.771∓0.108, P<0.01) and beginning to decrease at 28 days (0.582∓0.121, P<0.01). Meanwhile, DCX-positive cells and BrdU-positive cells, and DCX/BrdU double-labeled cells were detected in the DG of the hippocampus. Compared with those in the control group, BrdU/NeuN double-labeled cells were markedly increased in the granular cell layer of the DG at 28 days after ICH (1.808∓1.020 vs 5.654∓1.671, P<0.01).

Conclusion: ICH can promote neurogenesis in the DG of rat hippocampus.
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October 2013

Fatty acid synthase expression and esophageal cancer.

Mol Biol Rep 2012 Oct 22;39(10):9733-9. Epub 2012 Jun 22.

Department of Gastroenterology, The First Affiliated Hospital, Xi'an Medical University, 48 Fenghao West Road, Xi'an, 710077 Shaanxi Province, China.

Fatty acid synthase (FASN) overexpression has also been associated with a variety of human malignancies including tumor progression, aggressiveness, and metastasis. To investigate the role of FASN expression in esophageal cancer, we evaluated 60 cases of squamous cell carcinoma, 20 cases of adenocarcinoma, and 10 cases of normal esophageal tissues. We found that FASN was detected in 95 % human squamous cell carcinoma, and in 90 % human adenocarcinoma samples. However, all cases of normal esophageal epithelium did not express the protein of FASN. Further, to investigate the role of FASN in tumorigenesis and development, we analyze the growth and migration by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), colony formation and wound healing assay. We found that inhibition of FASN expression in TE13 cells by RNAi suppressed the growth of cells. Decreased FASN expression mitigated the migration of TE13 cells. These studies demonstrated the functional importance of FASN in esophageal tumorigenesis, and suggested that inhibiting FASN might be applied to treat esophageal cancer.
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http://dx.doi.org/10.1007/s11033-012-1838-yDOI Listing
October 2012

A near-frictionless and extremely elastic hydrogenated amorphous carbon film with self-assembled dual nanostructure.

Adv Mater 2012 Sep 21;24(34):4614-7. Epub 2012 Jun 21.

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, PR China.

A highly crosslinking network combined with a fullerene-like structure is disclosed in a hydrogenated amorphous carbon film. The very soft carbon film exhibits super-low friction and excellent wear resistance even under a Hertzian contact pressure comparable to its hardness under vacuum, which is an extraordinary tribological behavior in the filed of solid lubrication films or coatings.
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http://dx.doi.org/10.1002/adma.201200085DOI Listing
September 2012
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