Hydrogen Peroxide produced by Two Amino Acid Oxidases Mediates Antibacterial Actions

Zhang Hongmin,Yang Qiuyue,Sun Mingxuan,Teng Maikun,Niu Liwen The Microbiological Society of Korea 2004 The journal of microbiology Vol.42 No.4

The antibacterial actions of two amino acid oxidases, a D-amino acid oxidase from hog kidney and a L-amino acid oxidase from the venom of Agkistrodon halys, were investigated, demonstrating that both enzymes were able to inhibit the growth of both Gram-positive and Gram-negative bacteria, and that hydrogen peroxide, a product of their enzymatic reactions, was the antibacterial factor. However, hydrogen peroxide generated in the enzymatic reactions was not sufficient to explain the degree to which bacterial growth was inhibited. A fluorescence labeling assay showed that both of these two enzymes could bind to the surfaces of bacteria. To the best of our knowledge, this is the first report regarding the antibacterial activity of the D-amino acid oxidases.

Morphology and distribution of antennal, maxillary palp and labial palp sensilla of the adult bruchid beetles, Callosobruchus chinensis (L.) (Coleoptera: Bruchidae)

Hongmin WANG,Haixia ZHENG,Yaowen ZHANG,Xianhong ZHANG 한국곤충학회 2018 Entomological Research Vol.48 No.6

Callosobruchus chinensis (Coleoptera: Bruchidae) is the main pest of mungbean (Vigna radiata) especially during seed storage. To provide background information for chemical ecology studies, we examined the externalmorphology of the antennal, maxillary palp and labial palp sensilla of this insect with scanning electron microscopy. The antennae of adult C. chinensis exhibited sexual dimorphism. The female have serrated antenna and the male have pectinate morphology. Eight sensillum types have been observed on the antennae of both sexes: Böhm bristles, sensilla chaetica, sensilla trichodea, sensilla basiconica, sensilla styloconicum, sensilla coeloconica, sensillum campaniformia, sensilla cavity. There are no differences on the morphology of maxillary palp and labial palp between female and male. Four different types of sensilla are present on the labial and maxillary palps of both sexes of C. chinensis: sensilla chaetica, sensilla twig basiconica, sensilla basiconica, sensilla digitiformia.

Effects of boron source composition ratio on the microstructure and adsorption performance of hexagonal boron nitride prepared by template method

Zhang Ning,Liu Huan,Zhang Tianwen,Kan Hongmin,Wang Xiaoyang,Cui Xingyu 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3

The paper was prepared spherical hexagonal boron nitride with different microstructures under flowing ammoniaatmosphere. The effect of boron source component ratios (molar ratio of borax and boric acid) on the phase composition ofthe sample were studied: the work also explored the effect of boron source component ratio on the microstructure andadsorption performance of h-BN. Spherical hexagonal boron nitride had corresponding to shell structure, mesoporousstructure, and solid structure when the ratio of boron source components respectively was 1 : 0.5, 1 : 1, and 1 : 2. Between 1 : 1and 1:0.5, the former had an lower adsorptions at low relative pressures. On the contrary, the adsorption of former wouldincreased at higher relative pressures and reached up 276.02 cm3 g−1, and the maximum adsorption of the latter reached only228.20 cm3 g−1. Under any relative pressure, the adsorption capacity was the lowest when the boron source composition ratiowas 1 : 2.

Hydrogen Peroxide produced by Two Amino Acid Oxidases Mediates Antibacterial Actions

Hongmin Zhang,Qiuyue Yang,Mingxuan Sun,Maikun Teng,Liwen Niu 한국미생물학회 2004 The journal of microbiology Vol.42 No.4

The antibacterial actions of two amino acid oxidases, a D-amino acid oxidase from hog kidney and a L-amino acid oxidase from the venom of Agkistrodon halys, were investigated, demonstrating that both enzymes were able to inhibit the growth of both Gram-positive and Gram-negative bacteria, and that hydrogen peroxide, a product of their enzymatic reactions, was the antibacterial factor. However, hydrogen peroxide generated in the enzymatic reactions was not sufficient to explain the degree to which bacterial growth was inhibited. A fluorescence labeling assay showed that both of these two enzymes could bind to the surfaces of bacteria. To the best of our knowledge, this is the first report regarding the antibacterial activity of the D-amino acid oxidases.

사회적 배제가 의인화된 브랜드 이모티콘 선호에 미치는 영향 : 은유적 따뜻함의 매개효과 탐색

장설청(Zhang, Xueqing),안홍민(Ahn, Hongmin) 한국광고홍보학회 2021 한국광고홍보학보 Vol.23 No.4

본 연구는 기업이 제작 및 배포하는 의인화된 이모티콘의 브랜드 효과에 어떠한 요소들이 영향을 미치는지에 관해 학술적으로 탐구하고자 하였다. 이를 위해 소비자들이 일상에서 경험하는 사회적 배제가 이모티콘 의인화 선호에 어떠한 영향을 주는지에 주목하였다. 또한 사회적 배제를 느낀 소비자는 인간의 기본적인 항상성 메커니즘에 의해 따뜻한 자극을 선호한다는 결과를 바탕으로 은유적 따뜻함이 매개 변수로서 유의미하게 작용하는지 검증하고자 하였다. 가설 검증을 위해 이모티콘 의인화 수준(의인화 vs. 비인의화)과 사회적 배제(배제 vs. 비배제)의 2×2 집단 간 요인 설계를 이용하여 실험을 진행하였다. 연구 결과, 사회적 배제를 경험한 집단은 비의인화된 이모티콘 보다 의인화된 이모티콘에 대해 높은 이모티콘 선호도, 이모티콘 지속사용의도를 보였으며, 이러한 조절 효과는 은유적 따뜻함에 의해 매개된다는 것을 확인할 수 있었다. 본 연구는 학술적으로 소비자의 이모티콘 사용의도에 내재된 심리적 동기를 파악하는데 기여하였으며, 실무자에게는 의인화된 이모티콘이 브랜드 홍보 전략의 새로운 수단으로 쓰일 수 있다는 가능성을 보여주는 계기를 마련하였다고 하겠다. As emoticons gain bigger popularity in mobile instant messengers, many companies have created emoticons to represent their brand images. They have used anthropomorphization strategies to give human personalities to their brands, thus maintaining a closer relationship with consumers. The purpose of this research is to identify the factors that influence the preference for branded anthropomorphic emoticons. Specifically, it focuses on the effects of social exclusion. Consumers who experience social exclusion have a motivation to restore the threatened relations, and they are motivated to treat anthropomorphic branded emoticons as substitutes for real humans and use them to fix their broken relations. A 2(anthropomorphism: anthropomorphic emoticon vs. non-anthropomorphic emoticon) x 2(social bonding status: social exclusion vs. social inclusion) between group factorial design was employed to test our hypotheses. The results show that social exclusion has a significant moderating effect on emoticon preference and intention to use emoticons. Moreover, it shows that the moderating effect of anthropomorphism and social exclusion is mediated by perceived psychological warmth.

Preparation of nano aluminum nitride powders by polymer network method

Ning Zhang,Tingting Fu,Feiyi Yang,Hongmin Kan,Xiaoyang Wang,Haibo Long,Liuyan Wang 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2

In this work, aluminum nitrate (Al(NO3)3), active carbon and C12H22O11 were used as raw materials. The nano aluminum nitride powders (AlN) were synthesis by polymer network method. Aluminum nitride (AlN) exhibits high thermal conductivity, low dielectric permittivity and good electric insulativity. It has a very high synthetic temperature, however, results in a high cost. The aim of this investigation is to develop a new method of fabricating ultra-fine AlN powders to lower the synthetic temperature of AlN. The influences of different carbon sources and the synthetic temperature on fabricating AlN powders via polymer network method were investigated, and the mechanism of AlN formation was also identified. The results indicated that as using sucrose (C12H22O11) as the carbon source, the optimum synthetic process condition for fabricating ultrafine AlN powders was at 1500 °C for 2 h. Comparing with the mechanical ball-milling method, the temperature of synthesizing AlN powders was lowered about 100 °C. Furthermore, the size of as-synthesized AlN was finer from 50 nm to 80 nm.

Modified adaptive complementary sliding mode control for the longitudinal motion stabilization of the fully-submerged hydrofoil craft

Sheng Liu,Hongmin Niu,Lanyong Zhang,Changkui Xu 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

This paper presents a Modified Adaptive Complementary Sliding Mode Control (MACSMC) system for the longitudinal motion control of the Fully-Submerged Hydrofoil Craft (FSHC) in the presence of time varying disturbance and uncertain perturbations. The nonlinear disturbance observer is designed with less conservatism that only boundedness of the derivative of the disturbance is required. Then, a complementary sliding mode control system combined with adaptive law is designed to reduce the bound of stabilization error with fast convergence. In particularly, the modified complementary sliding mode surface which contains the estimation of the disturbance can reduce the switching gain and retain the normal performance of the system. Moreover, a hyperbolic tangent function contained in the control law is utilized to attenuate the chattering of the actuator. The global asymptotic stability of the closed-loop system is demonstrated utilizing the Lyapunov stability theory. Ultimately, the simulation results show the effectiveness of the proposed approach.

Compositional Dependence of the Recrystallization and Grain Growth in Strongly-distorted Pd-containing Multi-Component Equiatomic Alloys

Jingbo Qiao,Hongmin Zhang,Haoyan Meng,Fanchao Meng,Yang Tong,Daiyi Chao,Peter K. Liaw,Shuying Chen 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2

The equiatomic high entropy alloy (HEA) NiCoCrFePd crystalizes as a single face-centered cubic (FCC) phase with stronglocal lattice distortion due to large atomic size mismatch between Pd element and other constitute elements. To betterunderstand this quinary alloy, a family of single FCC phase equiatomic alloys made from the constituent elements of theNiCoCrFePd HEA, including the binary NiPd alloy, medium entropy alloys (MEAs) of NiCoPd, NiCrPd, and NiFePd, andthe quinary NiCoCrFePd HEA with fully-recrystallized microstructure was experimentally investigated to understand thechemical effects on grain growth kinetics and solid solution hardening. With the principal elements increasing from two tofive, the grain growth was increasingly inhibited in the annealing temperature range of 800–900 °C, while at 1000 °C andabove, the NiCrPd MEA showed the slowest grain growth, which may attribute to the higher melting temperature of Crand negative mixing enthalpy between Cr and other constituent elements, increasing the activation energy of grain growth. Moreover, the hardness depending on the grain size complied with the Hall-Petch relationship, in which NiCoPd exhibitedthe lowest hardness, while NiPd had a comparable hardness with NiCrPd and NiFePd. The above results suggested thatthe number of alloying elements was not the sole factor determining the sluggish diffusion and hardness. Instead, thetype of constituent elements in the Pd-containing multicomponent alloys played more critical role. Furthermore, it wasconcluded that the strength of MEAs and HEA should depend on the combination of atomic size and modulus mismatchand electronegativity difference.

Study on tool wear for efficient grooving blisk with disc milling cutter

Qingsi Cheng,Song Wang,Hongmin Xin,Jian Zhang,Changfeng Yao,Minchao Cui,Guangping Li 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10

Tool wear has an important influence on machining quality, cost, cutting force and heat. Grooving blisk with disc milling cutter is 3-4 times more efficient than plunge milling and side milling, but the tool wear is serious because of the large milling force and high milling temperature during the machining process. In the study, the damage and wear morphology of the tool was observed by focused ion/double beam system; the wear mechanism was studied by energy spectrum analysis; the tool life curve was drawn by the increase of flank wear. The experimental results show that the main wear and damage morphologies of disc milling cutter are chip sticking to the tool, chip accumulation, edge collapse, peeling, crack, plastic deformation and boundary wear; the main wear mechanism are abrasive wear, adhesive wear, oxidation wear and diffusion wear; the wear rate of the left blade is the fastest, followed by the right blade, and the wear rate of the middle blade is the slowest. These results can provide guidance for iimproving tool life, optimizing tool and mproving machining processes.

Modified adaptive complementary sliding mode control for the longitudinal motion stabilization of the fully-submerged hydrofoil craft

Liu, Sheng,Niu, Hongmin,Zhang, Lanyong,Xu, Changkui The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

This paper presents a Modified Adaptive Complementary Sliding Mode Control (MACSMC) system for the longitudinal motion control of the Fully-Submerged Hydrofoil Craft (FSHC) in the presence of time varying disturbance and uncertain perturbations. The nonlinear disturbance observer is designed with less conservatism that only boundedness of the derivative of the disturbance is required. Then, a complementary sliding mode control system combined with adaptive law is designed to reduce the bound of stabilization error with fast convergence. In particularly, the modified complementary sliding mode surface which contains the estimation of the disturbance can reduce the switching gain and retain the normal performance of the system. Moreover, a hyperbolic tangent function contained in the control law is utilized to attenuate the chattering of the actuator. The global asymptotic stability of the closed-loop system is demonstrated utilizing the Lyapunov stability theory. Ultimately, the simulation results show the effectiveness of the proposed approach.