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( Seung Wook Hong ),( Byong Duk Ye ),( Jae Hee Cheon ),( Ji Hyun Lee ),( Ja Seol Koo ),( Byung Ik Jang ),( Kang-Moon Lee ),( You Sun Kim ),( Tae Oh Kim ),( Jong Pil Im ),( Geun Am Song ),( Sung-Ae Jun 대한소화기학회 2022 Gut and Liver Vol.16 No.6
Background/Aims: The prospective Crohn’s Disease Clinical Network and Cohort Study is a nationwide multicenter cohort study of patients with Crohn’s disease (CD) in Korea, aiming to prospectively investigate the clinical features and long-term prognosis associated with CD. Methods: Patients diagnosed with CD between January 2009 and September 2019 were prospectively enrolled. They were divided into two cohorts according to the year of diagnosis: cohort 1 (diagnosed between 2009 and 2011) versus cohort 2 (between 2012 and 2019). Results: A total of 1,175 patients were included, and the median follow-up duration was 68 months (interquartile range, 39.0 to 91.0 months). The treatment-free durations for thiopurines (p<0.001) and anti-tumor necrosis factor agents (p=0.018) of cohort 2 were shorter than those of cohort 1. Among 887 patients with B1 behavior at diagnosis, 149 patients (16.8%) progressed to either B2 or B3 behavior during follow-up. Early use of thiopurine was associated with a reduced risk of behavioral progression (adjusted hazard ratio [aHR], 0.69; 95% confidence interval [CI], 0.50 to 0.90), and family history of inflammatory bowel disease was associated with an increased risk of behavioral progression (aHR, 2.29; 95% CI, 1.16 to 4.50). One hundred forty-one patients (12.0%) underwent intestinal resection, and the intestinal resection-free survival time was significantly longer in cohort 2 than in cohort 1 (p=0.003). The early use of thiopurines (aHR, 0.35; 95% CI, 0.23 to 0.51) was independently associated with a reduced risk of intestinal resection. Conclusions: The prognosis of CD in Korea appears to have improved over time, as evidenced by the decreasing intestinal resection rate. Early use of thiopurines was associated with an improved prognosis represented by a reduced risk of intestinal resection. (Gut Liver 2022;16:907-920)
Genetic Analysis of Morphological Traits of Rice Grain and Their Inter-relationships
Chang, Jae-Ki,Yeo, Un-Sang,Oh, Byong-Geun,Lim, Sang-Jong,Yang, Sae-Jun,Kim, Soon-Chul,Moon, Huhn-Pal,Sohn, Jae-Keun The Korean Society of Crop Science 2002 Korean journal of crop science Vol.47 No.1
Two rice varieties, 'Oochikara' with large grain and 'Hwayeongbyeo' and their progenies (F$_1$, F$_2$, B$_1$ and B$_2$) were tested to understand gene action of morphological traits of rice grain and their relationships. The evaluated traits were 1,000-grain weight, grain length, width, thickness, length-width ratio and chalkiness of brown rice. Correlation between grain weight and chalkiness was highly significant in the all progenies, and grain length were not associated with width and thickness in an F$_2$ population. Scaling test and jonit scaling test revealed that inheritance of grain traits were fitted to additive-dominance model without epistasis. Additive effects for the traits were much greater than the dominance effects.
Effect of Root Amount on Wind Damage in Rice
Jae Ki Chang,Un Sang Yeo,Byong Geun Oh,Jung Hoon Kang,Sae Jun Yang,Soon Chul Kim 韓國作物學會 2003 Korean journal of crop science Vol.48 No.2
Foehn damage on rice plant is one of the important abiotic stresses in eastern costal area of Korea. To know the relationship between foehn impact and morphological traits of rice, wind tunnel method was used with 106 rice cultivars. Less influencing traits on foehn were short panicle, large panicle number per hill, thin panicle neck, and the flag leaf of narrow, short and thick. Leaf pubescence reduced the impact on foehn. 'Naepungbyeo' belong-ed to foehn tolerant varietal group, while 'Ansanbyeo' belonged to the opposite group. Three levels of root cutting treatment with two rice cultivars were conducted to evaluate the foehn impact using wind tunnel. The severity of wind damages was followed the sigmoidal curve duration of wind tunnel treatment were prolonged. Different responses of root cutting to wind tunnel treatment could be used to evaluate the severity of the foehn impact. 'Naepungbyeo' was one of the less implausible cultivars on foehn. 'Nae-pungbyeo' showed tolerant response to wind under 21% root removing treat-ment (20㎝ root cutting), however 'Ansanbyeo' was wilted under the same treatment. In case of 35 % root removing treatment(10㎝ root cutting), both rice cultivars failed to alive against foehn wind.
Spin currents and spin–orbit torques in ferromagnetic trilayers
Baek, Seung-heon C.,Amin, Vivek P.,Oh, Young-Wan,Go, Gyungchoon,Lee, Seung-Jae,Lee, Geun-Hee,Kim, Kab-Jin,Stiles, M. D.,Park, Byong-Guk,Lee, Kyung-Jin Nature Publishing Group 2018 NATURE MATERIALS Vol.17 No.6
<P>Magnetic torques generated through spin-orbit coupling(1-8) promise energy-efficient spintronic devices. For applications, it is important that these torques switch films with perpendicular magnetizations without an external magnetic field(9-14). One suggested approach(15) to enable such switching uses magnetic trilayers in which the torque on the top magnetic layer can be manipulated by changing the magnetization of the bottom layer. Spin currents generated in the bottom magnetic layer or its interfaces transit the spacer layer and exert a torque on the top magnetization. Here we demonstrate field-free switching in such structures and show that its dependence on the bottom-layer magnetization is not consistent with the anticipated bulk effects(15). We describe a mechanism for spin-current generation(16,17) at the interface between the bottom layer and the spacer layer, which gives torques that are consistent with the measured magnetization dependence. This other-layer-generated spin-orbit torque is relevant to energy-efficient control of spintronic devices.</P>
A New Rice Variety Adaptable to Late Planting with High Quality, "Mananbyeo"
Sang Jong Lim,Jong Rae Kang,Byong Geun Oh,No Bong Park,Un Sang Yeo,Sae Jun Yang,Ho Yeong Kim,Hung Goo Hwang,Yon Cheon Song,Do Yeon Kwark,Woon Goo Ha,Jae Ki Chang,Jeom Sig Lee 한국육종학회 2003 한국육종학회지 Vol.35 No.1
Mananbyeo was developed from a three way cross ilyang110/Yeongdeog7//Milyang110 in 1999. It has short growing duration about 71 days from seeding to heading and short culm length of 75 cm. It has almost similar number of panicles per hill , spikelets per