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Jeonghwan Seo,Huang Xing,Su Jang,Sunghan Kim,Hee-Jong Koh 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
Hybrid sterility is a critical barrier of inter-subspecific crosses in rice. However, hybrid sterility can be overcome by wide compatibility variety. The HWC-line of rice had slender grain shape, tall culm length, wide compatibility with both indica and japonica cultivars. For QTL analysis of HWC-line, two F2 populations were derived from the crosses between the HWC-line and each of two Korean variety, Dasan (Korean Tongil-type cultivar) and Hwacheong (temperate japonica cultivar). In the cross between HWC-line/Dasan (HD), 93 STS markers and 13 SSR markers were mapped on 12 chromosomes. In the population from HWC-line/Hwacheong (HH) cross, 28 STS markers, 29 SSR markers and 1 FNP marker were mapped on 11 chromosomes. Eight agronomic characters were evaluated for QTL analysis in two F2 populations and parents. The F2 population from HD cross revealed 21 M-QTLs and 3 E-QTL for culm length, spikelet per panicle, spikelet fertility, grain length, grain width, grain shape and 100 grains weight. 8 QTLs of culm length, grain length, grain width and grain shape were newly detected in this study. In the F2 population from HH cross, 17 M-QTLs were detected for culm length, panicle length, spikelet fertility, grain length, grain width, grain shape and 100 grains weight. 6 QTLs of culm length, grain length, grain width and grain shape were newly found in this study. These QTLs will be able to provide basic information on putative functional genes related with agronomic characters and promote breeding new rice cultivar. HWC-line could be used as bridge for inter-subspecies crosses and in hybrid breeding.
Jang, Jeonghwan,Suh, Yae-Seul,Di, Doris Y. W.,Unno, Tatsuya,Sadowsky, Michael J.,Hur, Hor-Gil American Chemical Society 2013 Environmental science & technology Vol.47 No.2
<P>A total of 3564 <I>E. coli</I> isolates obtained from Yeongsan River basin of South Korea were investigated for their production of extended-spectrum β-lactamases (ESBLs) and potential pathogenicity to better understand the linkage between antibiotic-resistant pathogens in the environment and their public health risks. Interestingly, 60% (53 of 89) of the screen-positive ESBL producers were determined to be potentially one or both of the diarrheagenic and extraintestinal pathogenic (ExPEC) pathotypes, suggesting that trade-off between resistance and virulence of <I>E. coli</I> may not apply to this study. In addition, 67% (60 of 89) of the screen-positive ESBL producers possessed more than one β-lactamase gene, and most (59 of 63) of the ESBL producers had the CTX-M-14 enzyme, which is the most dominant ESBL and seems to be related to urban anthropogenic activities. About 68% (36 of 53) of the potential pathogenic strains were resistant to more than 2 non-β-lactam antibiotics. Results from this study indicate that the Yeongsan River basin has been contaminated with antibiotic-resistant and potential pathogenic <I>E. coli</I> strains. While few studies have examined pathogenecity of ESBL-producing bacteria, this study reports the possible public health risk which could be caused by the fecal indicator bacterium itself containing both ESBL genes and virulence factors. This will likely impact the dissemination of potential pathogenic <I>E. coli</I> producing ESBLs in the environment and suggests the need for further investigations of antibiotic-resistant pathogens to prevent public health impacts in the Yeongsan River basin.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2013/esthag.2013.47.issue-2/es303577u/production/images/medium/es-2012-03577u_0003.gif'></P>
Jang, Jeonghwan,Unno, Tatsuya,Lee, Seung Won,Cho, Kyung Hwa,Sadowsky, Michael J.,Ko, GwangPyo,Kim, Joon Ha,Hur, Hor‐,Gil Blackwell Publishing Ltd 2011 ENVIRONMENTAL MICROBIOLOGY Vol.13 No.12
<P><B>Summary</B></P><P>Seasonal and spatial variation in the genotypic richness of 3480 <I>Escherichia coli</I> isolates obtained from the Yeongsan River basin in South Korea was investigated by using the horizontal fluorophore‐enhanced rep‐PCR (HFERP) DNA fingerprinting technique. The relationship between 60 <I>E. coli</I> isolates from each of 58 freshwater samples was determined by using multidimensional scaling (MDS) analysis and self‐organized maps (SOMs). The MDS analysis, done based on HFERP DNA fingerprints, showed that <I>E. coli</I> isolates obtained in October through December clustered tightly, while those obtained in other sampling periods were more genetically diverse. However, site‐specific <I>E. coli</I> genotypes were not observed. SOMs analysis, done using the 10 most frequently isolated <I>E. coli</I> genotypes, showed the occurrence of season‐specific <I>E. coli</I> genotypes and the main SOMs clusters were most influenced by temperature, strain diversity and biochemical oxygen demand. Diversity among <I>E. coli</I> genotypes tended to decrease as water temperature decreased, and the numbers of <I>E. coli</I> genotypes observed in urban area were greater, more diverse and less dependent on water temperature than those obtained from agricultural areas. Taken together, our findings indicate that that an ecological approach needs to be considered in order to obtain a better understanding of <I>E. coli</I> community dynamics in the environment and that SOMs analysis is useful to visualize the multidimensional dependent variables that are influencing the types and dynamics of specific <I>E. coli</I> genotypes in the environment.</P>
Jang, Jeonghwan,Lee, Seung-Yong,Park, Hwanyeol,Yoon, Sangmoon,Park, Gyeong-Su,Lee, Gun-Do,Park, Yongjo,Kim, Miyoung,Yoon, Euijoon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.48
<P>Solid-phase epitaxy (SPE), a solid-state phase transition of materials from an amorphous to a crystalline phase, is a convenient crystal growing technique. In particular, SPE can be used to grow α-Al<SUB>2</SUB>O<SUB>3</SUB> epitaxially with a novel structure that provides an effective substrate for improved performance of light-emitting diodes (LEDs). However, the inevitable two-step phase transformation through the γ-Al<SUB>2</SUB>O<SUB>3</SUB> phase hinders the expected improved crystallinity of α-Al<SUB>2</SUB>O<SUB>3</SUB>, and thereby further enhancement of LED performance. Herein, we provide a fundamental understanding of the SPE growth mechanism from amorphous to metastable γ-Al<SUB>2</SUB>O<SUB>3</SUB> using transmission electron microscopy (TEM) and density functional theory (DFT) calculations. The nanobeam precession electron diffraction technique enabled clear visualization of the double-positioning domain distribution in the SPE γ-Al<SUB>2</SUB>O<SUB>3</SUB> film and emphasized the need for careful selection of the viewing directions for any investigation of double-positioning domains. Void and stacking fault defects further investigated by high-resolution scanning TEM (STEM) analyses revealed how double-positioning domains and other SPE growth behaviors directly influence the crystallinity of SPE films. Additionally, DFT calculations revealed the origins of SPE growth behavior. The double-positioning γ-Al<SUB>2</SUB>O<SUB>3</SUB> domains randomly nucleate from the α-Al<SUB>2</SUB>O<SUB>3</SUB> substrate regardless of the α-Al<SUB>2</SUB>O<SUB>3</SUB> termination layer, but the large energy requirement for reversal of the γ-Al<SUB>2</SUB>O<SUB>3</SUB> stacking sequence prevents it from switching the domain type during the crystal growth. We expect that this study will be useful to improve the crystallinity of SPE γ- and α-Al<SUB>2</SUB>O<SUB>3</SUB> films.</P> [FIG OMISSION]</BR>
Jang, Hochang,Lee, Wonsuk,Lee, Jeonghwan Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.554 No.-
<P><B>Abstract</B></P> <P>The main challenge of nanotechnologies for enhanced oil recovery (EOR) in carbonate reservoirs is to maintain the colloidal stability of nanoparticle dispersion (nanofluid) under the reservoir conditions with high salinity and high temperature. This study presents a nanofluid as an injection fluid for EOR under the extreme condition. The nanofluid was composed of surface-modified silica nanoparticles by a silane coupling agent (GPTMS, (3-Glycidoxypropyl)trimethoxysilane). The particle size distribution and particle aggregation were measured and observed to evaluate colloidal stability of the nanofluid by the light scattering and electron microscopy methods. As a result, the colloidal stability of the nanofluid was achieved at the salinity up to 20 wt% of base fluid at 90 °C, when the amount of GPTMS was 1 mmol/g. The wettability alteration test of carbonate rocks was carried out to validate the applicability of the nanofluid in the reservoir conditions. The results showed that the rock wettability of dolomite and limestone was effectively altered to neutral-wet and water-wet from strongly oil-wet, respectively, by the nanofluid with a small portion of particle concentration. Therefore, it is believed that the nanofluid can be an effective EOR agent in carbonate reservoirs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Jeonghwan Lee ),( Yong Chul Kim ),( Soie Kwon ),( Lilin Li ),( Sohee Oh ),( Do Hyoung Kim ),( Jung Nam An ),( Jang-hee Cho ),( Dong Ki Kim ),( Yong-lim Kim ),( Yun Kyu Oh ),( Chun Soo Lim ),( Yon Su 대한신장학회 2020 Kidney Research and Clinical Practice Vol.39 No.4
Background: The effect of each health-related quality of life (HRQOL) component on hemodialysis prognosis has not been well studied. We aimed to investigate the clinical factors associated with HRQOL and the effect of HRQOL after dialysis initiation on long-term survival in an Asian population. Methods: A total of 568 hemodialysis patients were included from a nationwide prospective cohort study. HRQOL was evaluated using the Kidney Disease Quality of Life (KDQOL) Short FormTM 1.3 at 3 months after dialysis initiation. The effect of each KDQOL item score on mortality was analyzed. Multivariable Cox analysis was performed after adjusting for age, sex, modified Charlson comorbidity index, and causes of primary kidney disease. Results: Old age, diabetes mellitus, high comorbidities, and low serum albumin levels were associated with poor physical health status. Decreased urine output was associated with both poor physical and mental health status. The scores of 3 indices in the kidney disease domain (effect of kidney disease, social support, and dialysis staff encouragement) showed significant associations with mortality, as did the 3 indices (physical function, physical role limitation, and body pain) in the physical health domain. Neither the 4 indices in the mental health domain nor the mental composite score showed a significant association with mortality. However, a high physical composite score was associated with decreased overall patient mortality (P = 0.003). The effect of physical composite score on survival was prominent among young or middle-aged groups. Conclusion: Poor physical health status 3 months after hemodialysis start correlates significantly with overall mortality.