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Antony Ananth,Ihn Han,Mahmuda Akter,Jin-Hyo Boo,Eun Ha Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
In this study, zinc sulphide nanomaterial (ZnS NM) powders were prepared with the assistance of anatmospheric pressure soft jet plasma (APPJ) device. Regular approaches to ZnS preparation mainlyresulted in aggregated powders, thus plasma methods were investigated to obtain controlledmorphological structures. The APPJ plasma-assisted ZnS exhibited unique surface architectures, suchas nanorods, layers and spherical aggregates, that were controllably obtained by changing the reactantconcentration and type of precursor. The prepared ZnS showed good thermal stability by no changes in itscomposition up to 400 C. The APPJ plasma-assisted ZnS showed sphalerite and wurtzite crystalstructures and resulted in excellent chemical purity. The simple and handy APPJ plasma method showsgood potential for shape-controlled ZnS NMs preparation without addition of surfactant chemicals,mechanical stirring, external heating or any other tedious procedures. This capability showcases thescientific and technological merit of this technique. The prepared ZnS NMs were utilized as antibacterialagents and evaluated the activity using three techniques against the human pathogens of E. coli, S. aureusand K. pneumoniae. The ZnS NMs showed effective concentration and shape-dependent activity whenused as an antibacterial material.
Antony Otinga Oteng’o,Jose Avila-Peltroche,So Young Jeong,Boo Yeon Won,Tae Oh Cho 한국환경생물학회 2018 환경생물 : 환경생물학회지 Vol.36 No.3
Acinetospora asiatica and Botrytella reinboldii are reported as two new records from S. Korea based on morphological studies and molecular analyses. A. asiatica is mainly characterized by the presence of sparsely branched uniseriate filaments with diffused meristematic zones, the formation of crampons at right angles, and the formation of plurilocular sporangia on both prostrate and erect filaments. B. reinboldii is characterized by the presence of irregularly alternating branched uniseriate filaments attached by rhizoids, and single or clustered plurilocular sporangia with a single opening. Molecular analyses of rbcL gene revealed that A. asiatica and B. reinboldii are placed within each clade of Acinetospora and Botrytella, respectively.
Antony, Ananth,Young Sun, Mok,Jin-Hyo, Boo,Byung You, Hong Elsevier 2018 Journal of solid state chemistry Vol.265 No.-
<P><B>Abstract</B></P> <P>This research deals with preparation, characterization and shape dependent performance of copper oxide nanomaterials (CuO NMs) in simple carbon monoxide (CO) oxidation catalysis. Uniform and high purity rice grains-like, needle-like and sheet-like CuO NMs were achieved by adopting different experimental conditions. The shape selective CuO NMs were physically mixed and re-pelletized with γ-Al<SUB>2</SUB>O<SUB>3</SUB> thus 1 wt% CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst was prepared. The catalysts exhibited good surface area (186–190 m<SUP>2</SUP> g<SUP>−1</SUP>), crystallinity, thermal stability and metal dispersion. The performance of various shape CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts in CO oxidation catalysis showed that needle-like CuO NMs performed superior against grains-like or sheet like CuO NMs in the temperature region between 200 and 225 °C. The 100% CO<SUB>2</SUB> formation was achieved at 325 and 400 °C in the dry and wet conditions. Also, in every process temperature, differences in the catalytic activity due to catalyst's shape could be noted significantly. It was observed that the catalyst morphology played main role in achieving efficient catalytic process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Shape-selective preparation of CuO nanostructures. </LI> <LI> Physicochemical characterizations. </LI> <LI> Shape dependent catalytic CO oxidation performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This research deals with the preparation, characterization and shape dependent performance of copper oxide nanomaterials (CuO NMs) in simple carbon monoxide (CO) oxidation catalysis. Uniform and high purity rice grains-like, needle-like and sheet-like CuO NMs were achieved by adopting different experimental conditions. The performance of various shape CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts in CO oxidation catalysis showed that needle-like CuO NMs performed superior against grains-like or sheet like CuO NMs in the temperature region between 200 and 225 °C. In every process temperature, differences in the catalytic activity due to catalyst's shape could be noted significantly.</P> <P>[DISPLAY OMISSION]</P>
Antony Otinga Oteng’o,Jose Avila-Peltroche,정소영,원부연,조태오 한국환경생물학회 2019 환경생물 : 환경생물학회지 Vol.37 No.3
Acinetospora filamentosa and Microspongium stilophorae are reported as new records from South Korea based on morphological and molecular analyses. A. filamentosa is mainly characterized by having the sparsely branched erect filaments, the scattered meristematic zones, forming crampons, plurilocular sporangia on both prostrate filaments and lower part of erect filaments, and spherical to oval unilocular sporangia formed either sessile or with a pedicel. M. stilophorae is an epiphytic thalli mostly on Stilophora sp. It is characterized by prostrate filaments with irregular cells, short erect filaments with short ramuli, phaeophycean hairs, uniseriate plurilocular sporangia on the terminal part of erect filament. Our molecular analyses of rbcL and cox1 genes reveals that A. filamentosa and M. stilophorae are nested within the clades of Acinetospora and Microspongium, respectively.
Antony, Sheedev,Cherouat, Abel,Montay, Guillaume Techno-Press 2019 Advances in aircraft and spacecraft science Vol.6 No.2
Recently, natural fibre composites are widely used in aerospace industries due to their good specific mechanical properties, better acoustic properties, light weight, readily availability, biodegradability, recyclability, etc. In this study, the hemp fibre woven fabrics / polypropylene based honeycomb sandwich structure were proposed for aerospace applications. Firstly, the hemp fibre woven fabrics based honeycomb sandwich structures were manufactured and experimental mechanical tests (compressive and flexural) were performed in the laboratory. Numerical simulation was also performed and analysed to validate the proposed methodology. Different complex shaped aircraft part CAD models were created and numerical analysis was carried out in order to have a better understanding about the complex honeycomb sandwich structures.
Antony Maodzeka,Qian Wang,Xiaoyang Chen,Nazim Hussain,Dezhi Wu,Lixi Jiang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.3
Application of 5-Aminolevulinic acid (ALA) toplants not only affects their growth, but also influences thenutritional values of plant organs. Oilseed rape (Brassicanapus L.) is an important source of vegetable oil and variouscompounds benefiting human health. However, limitedinformation is available regarding the effect of ALA on thegrowth of this important crop. Here, we investigated theconsequence of ALA application on oilseed rape seedlings. We found that moderate ALA concentrations (0.5 or 1 mg/L)caused an increase in the dry weight of the seedling biomassand the contents of various bioactive compounds, i.e. solublesugar, phenolic compounds, ascorbate, and glucosinolatesetc, and the upregulated expressional levels of the genesencoding RuBisCO, namely, BnRBCL and BnRBCS, andother genes such as BnUGT79B1, BnMYB12 and MYB28that regulate the synthesis of phenolic compounds andglucosinolates respectively. On the other hand, high ALAconcentrations (5 and 10 mg/L) gave rise to oxidative stressthat negatively affected oilseed rape growth, and causeddeleterious effects by reducing various bioactive compounds,but increasing tocopherols that may serve as a stress mitigatoryagent. With the high ALA concentrations, the ultrastructureof chloroplasts was notably damaged, featured with largestarch grains and fewer plastoglobules.
Antony Otinga Oteng'o,Jose Avila-Peltroche,최광철,조태오,원부연 한국환경생물학회 2020 환경생물 : 환경생물학회지 Vol.38 No.3
The genus Petroderma never been reported from the coast of Korea. In this study, our collection from Chaeseokang is matched with P. maculiforme morphologically. Petroderma maculiforme is characterized by having small irregular light to dark brown crusts, a basal layer of irregularly shaped cells giving rise to erect parallel filaments which easily separate with pressure, single chromatophore per cell, small spherical to cylindrical unilocular sporangia in a terminal position, and plurilocular sporangia narrower than erect filaments or wider and shorter than erect filaments in a terminal position. In addition, Hineksia sordida was also collected from Korea. It is mostly epiphytic and characterized by uniseriate filamentous thalli forming loose tangled masses, sparse and spiral branching, some long lateral branches, rhizoids occurring throughout the plant, plurilocular and unilocular sporangia scattered on separate plants. Our molecular analyses based on the rbcL gene reveal that our samples of P. maculiforme and H. sordida are nested within the clades of Petroderma and Hincksia, respectively. Therefore P. maculiforme and H. sordida are reported as new records from Korea based on morphological and molecular analyses.