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Vergeles, P.S.,Orlov, V.I.,Polyakov, A.Y.,Yakimov, E.B.,Kim, Taehwan,Lee, In-Hwan Elsevier 2019 Journal of Alloys and Compounds Vol.776 No.-
<P><B>Abstract</B></P> <P>The recombination and optical properties of dislocations in GaN introduced at room temperature by applied stress have been studied. It is observed that under the application of local shear stress of a few tens of MPa the dislocation glide in the parallel to the surface basal planes and in the planes intersecting the surface is activated at room temperature. It is shown that dislocations of dislocation half-loops gliding in the planes intersecting the surface can demonstrate both radiative and nonradiative recombination. Basal plane dislocations are shown to increase the nonradiative recombination rate. It is observed that the low-energy electron beam irradiation stimulates the dislocation glide both in the basal plane and the planes inclined to the surface, this effect being weaker for the basal plane. The analysis of electron irradiation effect on the dislocation related cathodoluminescence band suggests that this band is due to recombination involving complexes of point defects. These complexes are believed to be generated by gliding of the dislocation segments emerging at the surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recombination properties of dislocations in GaN after a Vickers indentation are studied. </LI> <LI> Dislocation glide in the basal plane and planes inclined to the surface is activated at room temperatures. </LI> <LI> Dislocation half-loops gliding in the planes inclined to the surface demonstrate radiative recombination of charge carriers. </LI> <LI> Low-energy electron beam irradiation stimulates the dislocation glides. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Effects of laterally overgrown n-GaN thickness on defect and deep level concentrations
Polyakov, A. Y.,Smirnov, N. B.,Govorkov, A. V.,Markov, A. V.,Yakimov, E. B.,Vergeles, P. S.,Lee, In-Hwan,Lee, Cheul Ro,Pearton, S. J. American Vacuum Society 2008 JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B - Vol.26 No.3
알칼리금속염과 철황산염을 촉매로 한 갈탄의 CO2 가스화반응에서 기체-고체 반응모델을 적용한 촉매활성의 비교
송병호,Vergel C. Bungay 한국에너지학회 2014 에너지공학 Vol.23 No.1
Catalytic gasification of a low rank coal- Inner Mongolian lignite has been carried out with carbon dioxide. The gasification reactions were performed in a thermogravimetric analyzer at temperatures of 600°C to 900°C. The kinetic parameters were evaluated using three different gas-solids reaction models and the prediction ability of each model were compared. Among the models evaluated, the modified volumetric model was found to correlate best both the non-catalytic and catalytic gasification reactions. The theoretical models, homogeneous and shrinking-core models, were found to satisfactorily correlate gasification reactions for the non-catalytic and FeSO4-catalyzed reactions. In case of alkali metal catalysts, the catalytic activity was mostly pronounced at a low temperature of 600℃ and observed to decrease by 50% as the temperature was increased to 700℃, and it remained nearly constant at temperature over 800℃. The order of catalytic activity was found to be: K2CO3>Na2CO3>K2SO4>FeSO4.
Arelli, Prakash R.,Concibido, Vergel C.,Young, Lawrence D. 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.3
Worldwide, soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is the most destructive pathogen of soybean [Glycine max (L.) Merr.]. Crop losses are primarily mitigated by the use of resistant cultivars. Nematode populations are variable and have adapted to reproduce on resistant cultivars over time because resistance primarily traces to two soybean accessions, Plant Introduction (PI) 88788 and Peking. Soybean cultivar Hartwig, derived primarily from PI437654, was released for its comprehensive resistance to most SCN populations. A synthetic nematode population (LY1) was recently selected for its reproduction on Hartwig. The LY1 nematode population currently infects known sources of resistance except soybean PI567516C; however, the resistance to LY1 has not been characterized. The objective of this study was to identify quantitative trait loci (QTLs) underlying resistance to the LY1 SCN population in PI567516C, identify diagnostic DNA markers for the LY1 resistance, and confirm their utility for marker-assisted selection (MAS). Resistant soybean line PI567516C was crossed to susceptible cultivar Hartwig to generate 105 recombinant inbred lines ($F_2$-derived $F_5$ families). QTLs were mapped using simple sequence repeats (SSRs) covering 20 Linkage Groups (LGs) and three diagnostic markers, Satt592, Satt331, and Sat_274, were identified on LG O. These markers have a combined efficacy of 90% in identifying resistant lines in a second cross that has been generated by crossing a susceptible cultivar 5601 T with resistant PI567516C. $F_2$-derived $F_4$ segregating population was used in MAS to identify resistant lines.
Wang Zheng,Jiang Du,Vergel-Rodriguez Mary,Nogalska Anna,Lu Rong 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
After transplantation, hematopoietic stem cells (HSCs) sustain blood cell regeneration throughout the patient’s life. Recent studies suggest that several types of mature blood cells provide feedback signals to regulate HSC fate. However, the potential feedback effect of hematopoietic progenitor cells has not been characterized to date. The present investigation demonstrated that multipotent progenitors (MPPs) promoted T cell production of HSCs when both cell types were cotransplanted in mice. Using genetic barcodes to track individual HSCs in mice, we found that the increased T cell production by HSCs was associated with the combined effects of altered lineage bias and clonal expansion during HSC differentiation. We showed that MPP and HSC co-transplantation promoted the multilineage differentiation of HSCs in the short term while preserving lymphoid-specialized HSC differentiation in the long term. Our findings indicate that MPPs derived from HSCs regulate the fate of HSCs after bone marrow transplantation.
Prakash R. Arelli,Vergel C. Concibido,Lawrence D. Young 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.3
Worldwide, soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is the most destructive pathogen of soybean [Glycine max (L.) Merr.]. Crop losses are primarily mitigated by the use of resistant cultivars. Nematode populations are variable and have adapted to reproduce on resistant cultivars over time because resistance primarily traces to two soybean accessions, Plant Introduction (PI) 88788 and Peking. Soybean cultivar Hartwig, derived primarily from PI437654, was released for its comprehensive resistance to most SCN populations. A synthetic nematode population (LY1) was recently selected for its reproduction on Hartwig. The LY1 nematode population currently infects known sources of resistance except soybean PI567516C; however, the resistance to LY1 has not been characterized. The objective of this study was to identify quantitative trait loci (QTLs) underlying resistance to the LY1 SCN population in PI567516C, identify diagnostic DNA markers for the LY1 resistance, and confirm their utility for markerassisted selection (MAS). Resistant soybean line PI567516C was crossed to susceptible cultivar Hartwig to generate 105 recombinant inbred lines (F2-derived F5 families). QTLs were mapped using simple sequence repeats (SSRs) covering 20 Linkage Groups (LGs) and three diagnostic markers, Satt592, Satt331, and Sat_274, were identified on LG O. These markers have a combined efficacy of 90% in identifying resistant lines in a second cross that has been generated by crossing a susceptible cultivar 5601T with resistant PI567516C. F2-derived F4 segregating population was used in MAS to identify resistant lines.
나무칩, 톱밥 바이오매스와 갈탄의 수증기 가스화반응 특성 연구
김경욱 ( Kyung Wook Kim ),( Vergel C Bungay ),송병호 ( Byung Ho Song ),최영태 ( Young Tai Choi ),이정우 ( Jeung Woo Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.4
Biomass and low-grade coals are known to be better potential sources of energy compared to crude oil and natural gas since these materials are readily available and found to have large reserves, respectively. Gasification of these carbonaceous materials produced syngas for chemical synthesis and power generation. Woodchip, sawdust and lignite were gasified with steam in a thermobalance reactor under atmospheric pressure in order to evaluate their kinetic rate information. The effects of gasification temperature (600∼900℃) and partial pressure of steam (20∼90 kPa) on the gasification rate were investigated. The three different types of gas-solid reaction models were applied to the experimental data to predict the behavior of the gasification reactions. The modified volumetric model predicted the conversion data well, thus the model was used to evaluate kinetic parameters in this study. The observed activation energy of biomass, sawdust and lignite gasification reactions were found to be in reasonable range and their rank was found to be sawdust > woodchip > lignite. The expression of apparent reaction rates for steam gasification of the three solids was proposed to provide basic information on the design of coal gasification processes.