Protective enzymes and genes related to the JA pathway are involved in the response to root-knot nematodes at high soil temperatures in tomatoes carrying Mi-1

Canli Hu,Wenchao Zhao,Jingwei Fan,Zilong Li,Rui Yang,Fukuan Zhao,JianLi Wang,Shaohui Wang 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.4

Root-knot nematodes (RKNs; Meloidogyne spp.) are obligate endoparasites that infect a large number of crop plants and cause severe yield losses. Tomato cultivars carrying the Mi-1 gene conferring root-knot nematode resistance have been widely used, but this gene loses its effectiveness at soil temperatures above 28°C. In this study, the mechanism of the loss of resistance to RKNs at high soil temperatures was examined using LA0655 (Solanum lycopersicum cv. Anahu), which contains the Mi-1 gene. It was found that high soil temperatures delayed the expression of the Mi-1 gene and reduced the activities of superoxide dismutase, peroxidase, chitinase, and β-1,3-glucanase. Although genes in the jasmonic acid (JA) pathway exhibited an obvious response at high soil temperatures, this response could not prevent the invasion of RKNs; indeed, at 30 days after inoculation with RKNs, the plants produced large numbers of root knots and egg masses at a soil temperature of 32°C.

Characteristics and kinetics analyses of different genus biomass pyrolysis

Can Yao,Hong Tian,Zhangmao Hu,Yanshan Yin,Donglin Chen,Xiaozhong Yan 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2

Four kinds of biomass (Chinese silvergrass, corn stalk, rice husk and pine) in China were selected as experimental samples for this study. Pyrolysis process of these biomass was researched by thermogravimetric Fourier transform infrared spectroscopy at 10 K/min. The results show that the pyrolysis process of all samples can be divided into three stages, and the comprehensive characteristics of volatile release degree of Chinese silvergrass is the highest, followed by corn stalk and rice husk, the lowest is pine. FTIR spectra results indicate that the pyrolysis gaseous products are mainly CO2, CO, CH4 and H2O. Kinetic parameters of the biomass were analyzed and determined by Coats-Redfern method, and the results show that corn stalk is the most susceptible to pyrolysis because the activation energy of Chinese silvergrass, corn stalk, rice husk and pine are 46.7, 29.3, 54.3 and 58.1 kJ/mol respectively.

Multi-Agent Distributed Intrusion Detection System Model Based on BP Neural Network

ZhaiShuang-can,Hu Chen-jun,Zhang Wei-ming 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.2

Effects of Isosorbide on the Microphase Separation and Properties of Waterborne Polyurethane Coatings

Jun Hu,Can Tao,Aining Yuan,Junjie Bao,Qin Cheng,Gewen Xu,Yiping Huang 한국고분자학회 2019 폴리머 Vol.43 No.2

Series of waterborne polyurethanes (WPUs) containing poly(tetra methylene glycol) (PTMG), 4,4-dicyclohexylmethane diisocyanate (HMDI), 2,2-dimethylolpropionic acid (DMPA), 2,2,4-trimethyl-1,3-pentanediol (TMPD), isosorbide (ISO) and ethylenediamine (EDA) were synthesized. The effects of ISO on the structure and properties of WPUs were studied by gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), dynamic mechanical analyzer (DMTA), X-ray diffraction (XRD), thermogravimetry (TG), mechanical test, chemical resistance and hardness test. The deconvolution analysis of FTIR of WPUs revealed that the hydrogen bond interaction in the WPUs increased with the increase of ISO content. Furthermore, the degree of microphase separation was increased with the increase of hydrogen bond interaction, which was confirmed by DSC, XRD and DMTA test. The results demonstrated that the addition of ISO can increase the hydrogen bond interaction between the hard and hard segments in WPUs, which improved the mechanical properties of the WPU films. The highest tensile strength was obtained of 59.67 MPa when the content of isosorbide was 10.35 wt%. Moreover, the ISO was helpful to improve the chemical resistance and hardness of the coatings by the comprehensive performance analysis.

Lymphangiogenic and Angiogenic Microvessel Density in Chinese Patients with Gastric Carcinoma: Correlation with Clinicopathologic Parameters and Prognosis

Cao, Fang,Hu, Yong-Wei,Li, Ping,Liu, Ying,Wang, Kuo,Ma, Lei,Li, Peng-Fei,Ni, Can-Rong,Ding, Hou-Zhong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8

The incidence of gastric cancer worldwide, and in particular in developing countries, has shown a marked increase. Poor prognosis of gastric cancer patients occurs due to the rapid metastasis of the disease via the lymphatic and blood vessels. The aim of this study was to investigate the expression and the clinical significance of D2-40 and CD34 in human gastric cancer. D2-40 and CD34 expression wasdetected in 1,072 cases of Chinese patients with gastric carcinoma using immunohistochemistry. The lymphatic vessel density (LVD) and microvessel density (MVD) were calculated and analyzed and the correlation with the clinicopathological factors and prognosis was determined. The LVD and MVD of the gastric cancer cases were significantly higher compared to those of normal tissues (P < 0.05). The expression of D2-40-LVD and CD34-MVD in the malignancies were positively related to the age, tumor size, invasion depth, lymphatic metastasis and pathological tumor-node-metastasis (pTNM) (P < 0.05); However, no statistically significant difference was identified between them with the patient gender (P > 0.05). Up-regulation of D2-40 and CD34 expression was significantly correlated with the poor survival rate in univariate and multivariate analyses. The LVD marked by D2-40 and the MVD marked by CD34 were positively correlated to the clinicopathological factors of the malignancies and may play important role in the development and progression of gastric cancer.

Multi-Population Genetic Algorithm for Identifying Mutated Driver Pathways in Cancer

Shu-Lin Wang,Can-jun Hu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.4

The cancer is one of the diseases of serious threat to mankind's health and life nowadays. Resistance to radiation and chemotherapy is a significant obstacle to the treatment of advanced cancer. Gene therapy is a new therapeutic tool for the treatment of diverse types of diseases, including cancer, congenital genetic, infectious diseases. It is well known that the somatic mutation is an important factor that might lead to cancer development. It is difficult to distinguish driver mutations from passenger mutations because of mutational heterogeneity, which is the key to solve and deal with the problem of cancer treatment. In this study, we find an efficient way Multi-Population Genetic Algorithm to solve the maximum weight submatrix problem which is designed to find important mutated driver genes in cancer, then makes the factors comparison of the methods on the simulated and several real mutation datasets. The results show that MPGA performs more efficiently, In addition, MPGA is a most robust method among these approaches, and these important pathways in these cancers are successfully rediscovered. The approach achieved what we expect.

Optimization of Processing Parameters for Particle Filtration Efficiency of Polypropylene Melt-blown Fabric

Taijun Jiang,Guangsheng Zeng,Can Hu,Cong Meng,Yi Chen 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

Polypropylene melt-blown fabric as the core filter materials plays an important role in manufacturing civil andmedical epidemic prevention products. The aim of this study was to optimize and control the particle filtration efficiency andapparent surface quality of the melt-blown fabric from the perspectives of electret masterbatch composition and processingparameters. Magnesium stearate and fumed silica were used as the electret to manufacture polypropylene melt-blown fabric. The layout and charge voltage of the electret device was taken as the variables to optimize and improve the particle filtrationefficiency and bulkiness coefficient of the fabric. The temperature of the barrel and die was controlled to enhance the surfacequality and corresponding particle filtration efficiency. The results showed that a combination of organic magnesium stearateand inorganic fumed silica could obtain a balance between particle filtration efficiency and smooth processing without beingjammed. Increasing the charge voltage and rearranging the position of the charge wires could significantly enhance theparticle filtration efficiency. A better particle filtration efficiency and reasonable bulkiness coefficient could be obtained bycontrolling the diameter of the filaments by regulating the temperature of the barrel and die as well as the suction intensity. The results obtained from this study can offer valuable references in optimization of electret master batch formulation andprocessing parameters for melt-blown fabric production with different resin.

Experimental Estimation of Relaxation Behavior for Hemp Fiber Reinforced Polypropylene Composite with Torque Rheometer

Taijun Jiang,Guangsheng Zeng,Can Hu 한국고분자학회 2020 Macromolecular Research Vol.28 No.5

Relaxation behavior of natural fiber reinforced polymer composites exists in both solid and molten state and profoundly affects the control and optimization of processing parameters and dimensional accuracy of final products. The aim of this study was to establish an experimental estimating method to characterize relaxation behavior of polymer composite with traditional torque rheometer and investigate the effects of fiber concentration, dimension, and processing parameters on the relaxation behavior. Relaxation time of hemp fiber reinforced polypropylene composite were obtained by fitting the experimental torque data and corelated to the buckling deformation of packaging boxes manufactured by injection with the same injection parameters. The results show that all the increasing concentration of hemp fiber, higher rotor speed, and higher temperature can significantly decrease the relaxation time and result in a stable and better dimensional accuracy of injection packaging boxes. The finer fibers with the same weight concertation can bring an obvious reduction in relaxation time and buckling deformation. The proposed method for estimating relaxation behavior of polymer composite is a feasible and cost-effective way to investigate the viscoelastic properties of polymer composites close to the real processing conditions. And it can be widely used in optimization of processing parameters and performance of polymer composite products.

염소계 VOCs의 UV 광분해 연구

강인선(InSun Kang),Jinying Xi,Can Wang,Hong-Ying Hu 한국대기환경학회 2017 한국대기환경학회지 Vol.33 No.2

Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters

Mei, Jun,Ji, Yu,Du, Xiaozhou,Ma, Tian,Huang, Can,Hu, Qinran The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6

This study proposes a quasi-fixed-frequency hysteresis current tracking control strategy for modular multilevel converters (MMCs) on the basis of voltage partition principle. First, by monitoring the grid voltage and the deviation between the output and reference currents, the output voltage is determined, thus prompting the output current to quickly and efficiently track the given current. Second, the voltages of the upper/lower capacitor of the arm and the voltages between the upper and lower arms are balanced by combining these arms with virtual loop mapping and arm voltage balance control, respectively. In particular, the proposed method is designed for any level and number of sub-modules. The validity of the proposed method is verified by simulations and experimental results of a five-level MMC prototype.