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Chao Chen,Yumei Wang,Chun Su,Xinqing Zhao,Ming Li,Xiaowei Meng,김영우,양승환,Yushu Ma,Dong-Zhi Wei,서주원 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.1
Passalora fulva (or Fulvia fulva) is the causalmicroorganism of tomato leaf mold, the outbreak of whichoccurs worldwide in greenhouse especially when humidityis high. However, studies on antifungal agents of P. fulvaare still very limited. In this study, a marine-derivedStreptomyces albidoflavus strain L131 showing potentinhibitory activities against P. fulva was identified andcharacterized. The active antifungal components wereobtained, and studies on the antifungal mechanisms of thecrude extract showed that the antifungal metabolites ofL131 caused damage of hyphae and spore development, aswell as plasma membrane of P. fulva. In addition, accumulationof endogenous reactive oxygen species of the leafpathogen was also observed after treatment by cultureextracts of L131. To our knowledge, this is the first reporton the studies of the antifungal mechanisms againstP. fulva, which benefit further development of biocontrolagent against tomato leaf mold disease.
CO2 capture by amine-functionalized nanoporous materials: A review
Chao Chen,안화승,Jun Kim 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Amine-functionalized nanoporous materials can be prepared by the incorporation of diverse organic aminemoieties into the pore structures of a range of support materials, such as mesoporous silica and alumina, zeolite, carbonand metal organic frameworks (MOFs), either by direct functionalization or post-synthesis through physical impregna-tion or grafting. These hybrid materials have great potential for practical applications, such as dry adsorbents for post-combustion CO2 capture, owing to their high CO2 capture capacity, high capture selectivity towards CO2 comparedto other gases, and excellent stability. This paper summarizes the preparation methods and CO2 capture performancebased on the equilibrium CO2 uptake of a range of amine-functionalized nanoporous materials.
Chao Chen,Yi Wang,Dun Zhang,Jin Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
With the rapid development of multiple functional nanozymes, the research on the unique characteristic,contributing to the enzyme-like activity, is essential for us to construct mimic enzymes with outstandingactivity. Herein, 2D Co-V mixed metal oxides (MMOs) are prepared through Co-V layered double hydroxide(LDH) precursor. The single phase of Co-V LDHs is prepared by controlling the dosage of hexamethylenetetramineaccurately in the coprecipitation system. After calcinated at 400 C, the obtainedCo-V MMOs, composed of Co3V2O8 and Co3O4, still inherite the microtopography of nanosheets fromthe precursor, which have superior surface properties to enhance the peroxidase/oxidase (POD/OXD)-like activity. 2D Co-V MMO nanosheets have excellent bactericidal properties in the presence of H2O2as low as 1 lM. The enhanced catalytic performances are attributed to unique hybrid nanosheets architectureand synergistic effect of two active components, ranking the hybrid nanostructure as a promisingantibacterial material.
Central limit theorem for weighted local time of L2 modulus of fractional Brownian motion
Chao Chen,Litan Yan,Cheng Ju 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.4
In this paper, we mainly prove a central limit theorem for weighted local time of L2-modulus of fractional Brownian motion with Hurst parameter H ∈ (12, 1). Similar to Hu and Nualart (2009), based on techniques of stochastic analysis, the main ingredients of the proof are analogous to the asymptotic version of Knight’s theorem and the fractional Clark–Ocone formula for the L2-modulus of the weighted local time increments.
Thermo plasticization and characterization of kenaf fiber by benzylation
Chao Chen,조미숙,김병우,남재도,이영관 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Kenaf fibers were heterogeneously benzylated in aqueous alkaline solution. The benzylated kenaf fibers were characterized by Fourier Transform Infrared (FTIR), dynamic mechanical analysis (DMA), scanning electron microscope (SEM), universal tensile machine (UTM), and the contact angle test. The results showed that the degree of benzylation depended on the reaction time, as assessed by the weight gain. The DMA analysis showed that the glass transition temperature of kenaf fiber decreased from 140 to 118 8C after benzylation, while the weight gain increased from 5 to 120%. The benzylated kenaf fibers exhibited good melt processability and were readily hot pressed into sheets. The sheet containing with fibers,which were benzylated for 3 h, exhibited 17.5 MPa in tensile strength, and the hydrophilic property of the sheet was greatly decreased as a function of benzylation time.
Chao Chen,Hua-Feng Li,Yu-Jie Hu,Meng-Jie Jiang,Qing-Sheng Liu,Jia Zhou 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.7
Purpose: Family with sequence similarity 83 member H (FAM83H) plays key roles in tumorigenesis. However, the specific rolesof FAM83H in cervical cancer (CC) have not been well studied. Materials and Methods: The RNA-seq data of 306 CC tissues and three normal samples downloaded from The Cancer GenomeAtlas were used to analyze the expression of FAM83H. The Kaplan-Meier method was used to draw survival curves. Associationsbetween FAM83H expression and clinicopathological factors were analyzed by chi-square test. Cox proportional hazards modelwas used to analyze prognostic factors. Loss-of-function assays were conducted to discover the biological functions of FAM83Hin cell proliferation, colony formation, invasion, and migration. Real-time Quantitative Reverse Transcription PCR (qRT-PCR)and Western blotting were used to measure the expression levels of FAM83H in CC cell lines. Results: Our results demonstrated that FAM83H is overexpressed in CC tissues and that high FAM83H expression is associatedwith worse overall survival (OS). High FAM83H expression in CC was associated with clinical stage, pathologic tumor, and pathologicnode. Univariate analysis suggested that FAM83H expression was significantly related to the OS of CC patients. Althoughmultivariate analysis showed that FAM83H expression was not an independent prognostic factor for the OS of CC patients, the effectsof FAM83H on CC cell growth and motility was significant. Loss-of-function experiments demonstrated that knockdown ofFAM83H inhibited proliferation, colony formation, migration, and invasion of CC cells by inactivating PI3K/AKT pathway. Conclusion: FAM83H might play a crucial role in CC progression and could act as a novel therapeutic target in CC.
Chao Chen,Shu Chen,Miao Shui,Xiaoping Xu,Weidong Zheng,Lin Feng,Jie Shu,Yuanlong Ren 한국물리학회 2015 Current Applied Physics Vol.15 No.2
Cathode material 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 is successfully synthesized by citrate acid assisted sol -gel method and shows pretty good electro-chemical performance. To elucidate the electro-chemical reactions and charge carrier transportation kinetics in the charge-discharge process, series of electrochemical impedance spectra for the first and the second charge process are measured on multiple given state of charges. The rapid augmentation of resistance to electronic conduction and ionic conduction within the voltage range 4.45-4.6 V where the removal of Li2O from Li2MnO3 component takes place gives us more evidence about the complicated “structurally integrated” feature of this material. The relatively large span of the arc responsible for electronic conduction and the extremely large Mn3+ related charge transfer resistance at the beginning of the second charging indicate that after one complete charge-discharge cycle, Li2MnO3 and LiNi0.5Mn0.5O2 domains still reserve its original structure and will keep its structure for the followed cycles.
Surface Texture of Pulse-magnetron-sputtered ZnO:Al Films by Using a Diluted NH4Cl Aqueous Solution
Chao Chen,Yan Liang,Xiao-Yong Gao 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.10
This paper mainly addresses the effects of the NH4Cl concentration and etching time on the surface texture of <103>-oriented ZnO:Al films deposited by using direct-current pulse-magnetron reactive sputtering. A mechanism for the etching of the ZnO:Al films by NH4Cl is also proposed. The best surface texture was observed the same as it was etched for 15 min by using a 3.0 wt.% NH4Cl solution. The average reflectivity at wavelengths from 300 nm to 800 nm was sharply reduced to 4.607%. The etching with NH4Cl is closely related to the preferential <103> orientation rather than the usual preferential <002> orientation. The increased number of defects around the boundary is responsible for the surface texture and the blueshift of the absorption edge of the films.
The Mixed Kernel Function SVM-based Point Cloud Classification
Chao Chen,Xiaomin Li,Abdelkader Nasreddine Belkacem,Zhifeng Qiao,Enzeng Dong,Wenjun Tan,Duk Shin 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.5
Measurement and detection of ground information by airborne Lidar are one of the hot topics in the field of intelligent sensing in recent years. This study proposes a new point cloud classification algorithm of Mixed Kernel Function SVM to distinguish different types of ground objects. Firstly, the combined features including the coordinate values, the RGB value, normalized elevation, standard deviation of elevation, and elevation difference of point cloud data were extracted. A mixed kernel function of Gauss and Polynomial was designed. Then, one-versus-rest SVM multiple classifiers was constructed. Finally, the feature of 3D point cloud data was employed to train the SVM classifiers. The overall classification accuracies of test data were 97.69% and 99.13% for two data sets, I and II respectively. In addition, the experimental results have showed that the performance of the proposed method with mixed kernel function SVM was better than standard SVM method with Gaussian kernel function and polynomial kernel function only, which demonstrates the effectiveness of the proposed method.