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Neung, Saophuong,Nguyen, Xuan Hoa,Naing, Kyaw Wai,Lee, Young Seong,Kim, Kil Yong The Korean Society for Applied Biological Chemistr 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.2
Diamondback moth, Plutella xylostella, is one of the most destructive insect pests of several crops world-wide. Effects of Paenibacillus elgii HOA73 and its combined application with organic sulfur pesticide on Plutella xylostella were evaluated. Results showed that M3 medium composition indicated the best medium for optimization of bacterial colony growth, hydrolytic enzyme production, and insecticidal activity and was selected for culturing P. elgii HOA73 in further assays. The highest colony growth of P. elgii HOA73 was identified at 5 days after inoculation. Extracted crude enzyme and crude insecticidal compound from P. elgii HOA73 cultured in the optimized medium kill the second instar larvae of Diamondback moth in 40 and 50% at $220mg\;mL^{-1}$ of crude enzyme and 2% crude extract, respectively. Combined application of organic sulfur pesticide with bacterial suspension significantly killed 85% second instar larvae of Diamondback moth, when compared to use of single application: bacterial suspension (65%) and organic sulfur pesticide (38%), suggesting that P. elgii HOA73 combined with organic sulfur pesticide could be used to control P. xylostella
Saophuong Neung,Xuan Hoa Nguyen,Kyaw Wai Naing,이영상,김길용 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.2
Diamondback moth, Plutella xylostella, is one of themost destructive insect pests of several crops world-wide. Effectsof Paenibacillus elgii HOA73 and its combined application withorganic sulfur pesticide on Plutella xylostella were evaluated. Results showed that M3 medium composition indicated the bestmedium for optimization of bacterial colony growth, hydrolyticenzyme production, and insecticidal activity and was selected forculturing P. elgii HOA73 in further assays. The highest colonygrowth of P. elgii HOA73 was identified at 5 days after inoculation. Extracted crude enzyme and crude insecticidal compound from P. elgii HOA73 cultured in the optimized medium kill the secondinstar larvae of Diamondback moth in 40 and 50% at 220mg mL−1of crude enzyme and 2% crude extract, respectively. Combinedapplication of organic sulfur pesticide with bacterial suspensionsignificantly killed 85% second instar larvae of Diamondbackmoth, when compared to use of single application: bacterialsuspension (65%) and organic sulfur pesticide (38%), suggestingthat P. elgii HOA73 combined with organic sulfur pesticide couldbe used to control P. xylostella.
Nguyen, Xuan-Hoa,Naing, Kyaw-Wai,Lee, Young-Seong,Tindwa, Hamisi,Lee, Geon-Hyoung,Jeong, Byoung-Kon,Ro, Hee-Myeong,Kim, Sang-Jun,Jung, Woo-Jin,Kim, Kil-Yong The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.3
The root rot of pepper (Capsicum annuum L.) caused by Phytophthora capsici is one of the most important diseases affecting this crop worldwide. This work presents the evaluation of the capacity of Streptomyces griseus H7602 to protect pepper plants against Phytophthora capsici and establishes its role as a biocontrol agent. In this study, we isolated an actinomycete strain H7602 from rhizosphere soil, identified it as Streptomyces griseus by 16S rRNA analysis and demonstrated its antifungal activity against various plant pathogens including P. capsici. H7602 produced lytic emzymes such as chitinase, ${\beta}$-1,3-glucanase, lipase and protease. In addition, crude extract from H7602 also exhibited destructive activity toward P. capsici hyphae. In the pot trial, results showed the protective effect of H7602 against pepper from P. capsici. Application of H7602 culture suspension reduced 47.35% of root mortality and enhanced growth of pepper plants for 56.37% in fresh root and 17.56% g in fresh shoot as compared to control, resulting in greater protection to pepper plants against P. capsici infestation. Additionally, the enzymatic activities, chitinase and ${\beta}$-1,3-glucanase, were higher in rhizosphere soil and roots of pepper plants treated with H7602 than other treated plants. Therefore, our results indicated a clear potential of S. griseus H7602 to be used for biocontrol of root rot disease caused by P. capsici in pepper.
NGUYEN, Xuan Hoa,KIM, In-Ki,JANG, Byung Koog,OH, Yoon-Suk Ceramic Society of Japan 2013 JOURNAL OF THE CERAMIC SOCIETY OF JAPAN - Vol.121 No.1420
<P>The effects of carbon content on the tribological behavior of titanium carbonitride(TiCxN1-x) films have been studied herein. A set of titanium carbonitride(TiCxN1-x) films was prepared by arc ion plating with a pure Ti target and a gas mixture of C2H2/N-2 on a steel substrate. High-definition field-emission scanning electron microscopy (FESEM) was used to investigate the microstructure of the films. The chemical composition of the films was analyzed using both electron dispersion spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) analysis. The surface roughness and microhardness of the films were measured using alpha-step profilometer and nanoindenter respectively. The tribology of titanium carbonitride(TiCxN1-x) films was investigated using a ball-on-disc testing method and the wear tracks were observed by low-magnification SEM. The tribological behavior of the films was significantly changed with variation of the C2H2/N-2 gas ratio. A very low friction coefficient (0.07) of titanium carbonitride(TiCxN1-x) film was observed when the C2H2:N-2 gas ratio was about 3:2. (C) 2013 The Ceramic Society of Japan. All rights reserved.</P>
Xuan-Hoa Nguyen,Kyaw Wai Naing,이용성,Hamisi Tindwa,이건형,정병곤,노희명,김상준,정우진,김길용 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.3
The root rot of pepper (Capsicum annuum L.) caused by Phytophthora capsici is one of the most important diseases affecting this crop worldwide. This work presents the evaluation of the capacity of Streptomyces griseus H7602 to protect pepper plants against Phytophthora capsici and establishes its role as a biocontrol agent. In this study, we isolated an actinomycete strain H7602from rhizosphere soil, identified it as Streptomyces griseus by 16S rRNA analysis and demonstrated its antifungal activity against various plant pathogens including P. capsici. H7602 produced lytic emzymes such as chitinase,β-1,3-glucanase, lipase and protease. In addition, crude extract from H7602 also exhibited destructive activity toward P. capsici hyphae. In the pot trial, results showed the protective effect of H7602 against pepper from P. capsici. Application of H7602 culture suspension reduced 47.35% of root mortality and enhanced growth of pepper plants for 56.37% in fresh root and 17.56% g in fresh shoot as compared to control, resulting in greater protection to pepper plants against P. capsici infestation. Additionally, the enzymatic activities, chitinase and β-1,3-glucanase, were higher in rhizosphere soil and roots of pepper plants treated with H7602 than other treated plants. Therefore, our results indicated a clear potential of S. griseus H7602 to be used for biocontrol of root rot disease caused by P. capsici in pepper.
A Prospective Technique for Damage Detection in Truss Structures Using the Fusion of DNN with AVOA
Quyet Huu Nguyen,Thang Xuan Le,Dang Le Minh Nguyen,Thanh Tien Bui,Nhung Cam Nguyen Thi,Hoa Tran 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.7
In recent decades, the integration of optimization methods and Machine Learning (ML) models has garnered significant attention within the research community. In the pursuit of establishing a symbiotic relationship between ML and optimization algorithms, this study focuses on the fusion of the African Vulture Optimization Algorithm (AVOA) - an optimization algorithm inspired by the foraging behavior of African vultures - with Deep Neural Networks (DNNs) - a prevalent model in ML for damage detection of a real large-scale bridge. In this research, AVOA, possessing a vast search space and the ability to autonomously adjust crucial parameters during the search process, such as flight velocity and learning rate, is employed to select informative features such as weight and biases of DNNs. This synergy allows the network to automatically adjust its potential. The technique is applied to a truss bridge, utilizing Finite Element Model (FEM) data that has been validated by real-world vibration measurements, resulting in precise damage identification even in the presence of white Gaussian noise. Evaluation criteria demonstrate enhanced accuracy and computational efficiency compared to the traditional neural network approach.
Huynh Le Thanh Nguyen,Tran Thanh Nhut,Ho Thi Thanh Nguyen,Le Xuan Hoa,Le Viet Hai,Nguyen Thai Hoang 한국탄소학회 2022 Carbon Letters Vol.32 No.6
Enhancing the capacitive deionization performance requires the inner structure expansion of porous activated carbon to facilitate the charge storage and electrolyte penetration. This work aimed to modify the porosity of coconut-shell activated carbon (AC) through CO2 activation at high temperature. The electrochemical performance of CO2-activated AC electrodes was evaluated by cyclic voltammetry, charge/discharge test and electrochemical impedance spectroscopy, which exhibited that AC-800 had the superior performance with the highest capacitance of 112 F/g at the rate of 0.1 A/g and could operate for up to 4000 cycles. Furthermore, in the capacitive deionization, AC-800 showed salt removal of 9.15 mg/g with a high absorption rate of 2.8 mg/g min and Ni(II) removal of 5.32 mg/g with a rate close to 1 mg/g.min. The results promote the potential application of CO2-activated AC for desalination as well as Ni-removal through capacitance deionization (CDI) technology.
A scintillation detector confi guration for pulse shape analysis
Phan Van Chuan,Nguyen Duc Hoa,Nguyen Xuan Hai,Nguyen Ngoc Anh,Nguyen Nhi Dien,Pham Dinh Khang 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
This paper presents a neutron detector configuration using EJ-301 scintillation liquid, a R9420 photomultiplierand a homemade preamplifier. The detector qualities which include the energy linearity, efficiencyresponse and neutron/gamma discrimination are guaranteed for neutron detection in the energyrange from 0 to 3000 keVee. Regarding the neutron/gamma discrimination capability, four pulse shapediscrimination (PSD) methods which are the threshold crossing time (TCT), pulse gradient analysis (PGA),charge comparison (CC) and correlation pattern recognition (CPR), were evaluated and discussed; amongof these, the CPR method provides the best neutron/gamma discrimination