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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.
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
Control Strategy for Accurate Reactive Power Sharing in Islanded Microgrids
Xuan Hoa Thi Pham,Toi Thanh Le 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a control strategy to enhance the accuracy of reactive power sharing between paralleled three-phaseinverters in an islanded microgrid. In this study, the mismatch of power sharing when the line impedances have significantdifferences between inverters connected to a microgrid has been solved, the accuracy of the reactive power sharing in an islandedmicrogrid is increased, the voltage droop slope is tuned to compensate for the mismatch of voltage drops across the lineimpedances by using an enhanced droop controller. The proposed method ensures accurate power sharing even if the microgridhas local loads at the output of the inverters. The control model has been simulated by MATLAB/Simulink with two or threeinverters connected in parallel. Simulation results demonstrate the accuracy of the implemented control method. Furthermore, inorder to validate the theoretical analysis and simulation results, an experimental setup was built in the laboratory. Resultsobtained from the experimental setup verify the effectiveness of the proposed method.
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.
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>
Control Strategy for Accurate Reactive Power Sharing in Islanded Microgrids
Pham, Xuan Hoa Thi,Le, Toi Thanh The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a control strategy to enhance the accuracy of reactive power sharing between paralleled three-phase inverters in an islanded microgrid. In this study, the mismatch of power sharing when the line impedances have significant differences between inverters connected to a microgrid has been solved, the accuracy of the reactive power sharing in an islanded microgrid is increased, the voltage droop slope is tuned to compensate for the mismatch of voltage drops across the line impedances by using an enhanced droop controller. The proposed method ensures accurate power sharing even if the microgrid has local loads at the output of the inverters. The control model has been simulated by MATLAB/Simulink with two or three inverters connected in parallel. Simulation results demonstrate the accuracy of the implemented control method. Furthermore, in order to validate the theoretical analysis and simulation results, an experimental setup was built in the laboratory. Results obtained from the experimental setup verify the effectiveness of the proposed method.
Xuan The Le,Dung Tien Pham,Tuan Anh Pham,Tung Thanh Tran,Thanh Huu Khuat,Hoa Quang Le,Ut Ngoc Vu 한국수산과학회 2019 Fisheries and Aquatic Sciences Vol.22 No.3
Bacillus is a diverse genus consisting of more than 200 species with extensive genetic diversity. Their beneficial effects in industrial shrimp farming have been well documented. However, little is known about the biodiversity of the Bacillus spp. in this aquaculture system. Taxonomic analysis by 16S rRNA sequencing does not always allow species-level identification of Bacillus spp. In this study, 26 Bacillus isolates from two industrial Litopenaeus vannamei shrimp ponds in Bac Lieu Province, Vietnam, were analyzed for their genetic diversity by multi-locus sequence typing (MLST). A total of 22 sequence types were identified and segregated into four distinct clusters, corresponding to B. subtilis, B. velezensis, B. siamensis, and B. licheniformis. Bacillus subtilis and B. velezensis accounted for more than 73% of the Bacillus isolates. Notably, the MLST scheme exhibited high discriminatory power and might be further simplified to be a convenient method to identify species of the genus Bacillus.