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The prediction of the tooth size in the mixed dentition for Korean
Moon, Sung-Hwan,Kim, Seong-Oh,Yu, Hyung-Seong,Choi, Byung-Jai,Choi, Hyung-Jun,Lee, Jae-Ho 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2
이번 연구의 목적은 혼합치열기 아동에서 미맹출된 견치와 소구치의 크기를 예측하는데 있어서 한국인에 맞는 방정식을 만들기 위함이다. 미맹출 치아의 크기를 예측하는 것은 혼합치열기 교정 진단과 치료계획 수립에 있어서 매우 중요하다. 미맹출된 견치와 소구치 크기를 예측하는 방법은 몇가지가 있지만 그중에서도 가장 흔하게 쓰이는 것이 모이어의 예측표와 다나카와 존스턴의 방정식이 있다. 하지만 그것들은 백인을 위해서 제작된 것이고 치아 크기는 인종에 따라서 다르다고 알려져 있다. 이번 연구에서는 치아크기를 측정하여 하악 영구 절치의 크기 합과 견치 및 소구치의 크기 합 사이의 상관관계를 구하고 회귀방정식을 이용해서 한국인에 맞는 예측표를 만들었다. 연세대학교 치과대학에 재학중인 178명의 한국 학생(남 108명, 여 70명, 평균연령 21.63)을 대상으로 실험하였다. 영구치의 근원심 폭경을 석고모형상에서 calipers를 이용해서 측정하였다. 성별간의 치아 크기는 차이가 있었다(p<0.05). Correlation coefficient는 0.57에서 0.64의 범위였고, standard errors of the estimates 는 여성에서 0.6으로써 남성보다 우수하였다. r^(2)값은 0.27에서 0.41의 범위를 나타내었다. Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Several methods were introduced and used for the prediction. The most common methods among these would be Moyers probability chart and Tanaka and Johnston equations. These are currently used widely, but they were developed for Caucasians. Because there are clear racial differences in teeth size, the objectives of this study were to produce correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and those of the canines and premolars for each quadrant, and prediction tables with regression equations, specifically for Korean. 178 young adults (70 women, 108 men, mean age 21.63 years) were selected from the College of Dentistry, Yonsei University, Seoul, Korea. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and those of the maxillary and mandibular canines and premolars were found to be between 0.52 and 0.64. The standard error of the estimatation was better (0.60) for women and the r^(2) values ranged from 0.27 to 0.41 for both sexes, Prediction tables were prepared for Korean. This study showed larger canine and premolar diameters than Tanaka and Johnston's and Moyers' studies which might be due to the racial differences. Further investigations with a larger sample size will be needed for more representative data on the Korean population.
Lee, Min Jae,Kim, Dong Eun,Zakrzewska, Adriana,Yoo, Young Dong,Kim, Su-Hyeon,Kim, Sung Tae,Seo, Jai Wha,Lee, Young Sook,Dorn, Gerald W,Oh, Uhtaek,Kim, Bo Yeon,Kwon, Yong Tae American Society for Biochemistry and Molecular Bi 2012 The Journal of biological chemistry Vol.287 No.28
<P>The N-end rule pathway is a proteolytic system in which destabilizing N-terminal amino acids of short lived proteins are recognized by recognition components (N-recognins) as an essential element of degrons, called N-degrons. In eukaryotes, the major way to generate N-degrons is through arginylation by ATE1 arginyl-tRNA-protein transferases, which transfer Arg from aminoacyl-tRNA to N-terminal Asp and Glu (and Cys as well in mammals). We have shown previously that ATE1-deficient mice die during embryogenesis with defects in cardiac and vascular development. Here, we characterized the arginylation-dependent N-end rule pathway in cardiomyocytes. Our results suggest that the cardiac and vascular defects in ATE1-deficient embryos are independent from each other and cell-autonomous. ATE1-deficient myocardium and cardiomyocytes therein, but not non-cardiomyocytes, showed reduced DNA synthesis and mitotic activity ~24 h before the onset of cardiac and vascular defects at embryonic day 12.5 associated with the impairment in the phospholipase C/PKC-MEK1-ERK axis of Gα(q)-mediated cardiac signaling pathways. Cardiac overexpression of Gα(q) rescued ATE1-deficient embryos from thin myocardium and ventricular septal defect but not from vascular defects, genetically dissecting vascular defects from cardiac defects. The misregulation in cardiovascular signaling can be attributed in part to the failure in hypoxia-sensitive degradation of RGS4, a GTPase-activating protein for Gα(q). This study is the first to characterize the N-end rule pathway in cardiomyocytes and reveals the role of its arginylation branch in Gα(q)-mediated signaling of cardiomyocytes in part through N-degron-based, oxygen-sensitive proteolysis of G-protein regulators.</P>
Lee, Hyo-Sung,Hwang, Jong Hee,Lim, Tae-Young,Kim, Jin-Ho,Jeon, Dae-Woo,Jung, Hyun-Suk,Lee, Mi Jai The Korean Ceramic Society 2015 한국세라믹학회지 Vol.52 No.4
Currently, the majority of commercial white LEDs are phosphor converted LEDs made of a blue-emitting chip and YAG yellow phosphor dispersed in organic silicone. However, silicone in high-power devices results in long-term performance problems such as reacting with water, color transition, and shrinkage by heat. Additionally, yellow phosphor is not applicable to warm white LEDs that require a low CCT and high CRI. To solve these problems, mixing of green phosphor, red phosphor and glass, which are stable in high temperatures, is common a production method for high-power warm white LEDs. In this study, we fabricated conversion lenses with LUAG green phosphor, SCASN red phosphor and low-softening point glass for high-power warm white LEDs. Conversion lenses can be well controlled through the phosphor content and heat treatment temperature. Therefore, when the green phosphor content was increased, the CRI and luminance efficiency gradually intensified. Moreover, using high heat treatment temperatures, the fabricated conversion lenses had a high CRI and low luminance efficiency. Thus, the fabricated conversion lenses with green and red phosphor below 90 wt% and 10 wt% with a sintering temperature of $500^{\circ}C$ had the best optical properties. The measured values for the CCT, CRI and luminance efficiency were 3200 K, 80, and 85 lm/w.
Microstructural Feature of Full-densified W-Cu Nanocomposites Containing Low Cu Content
Lee, Jai-Sung,Jung, Sung-Soo,Choi, Joon-Phil,Lee, Geon-Yong The Korean Powder Metallurgy Institute 2013 한국분말재료학회지 (KPMI) Vol.20 No.2
The microstructure evolution during sintering of the W-5 wt.%Cu nanocomposite powders was investigated for the purpose of developing a high density W-Cu alloy. The W-5 wt.%Cu nanopowder compact, fully-densified during sintering at 1623 K, revealed a homogeneous microstructure that consists of high contiguity structures of W-W grains and an interconnected Cu phase located along the edges of the W grains. The Vickers hardness of the sintered W-5 wt.%Cu specimen was $427{\pm}22$ Hv much higher than that ($276{\pm}19$ Hv) of the conventional heavy alloy. This result is mostly due to the higher contiguity microstructure of the W grains compared to the conventional W heavy alloy.
Bacteriocin from Purple Nonsulfur Phototrophic Bacteria, Rhodobacter capsulatus
Lee, Sang-Seob,Oh, Tae-Jung,Kim, Jai-Soo,Kim, Jong-Bae,Lee, Hyun-Soon The Korean Society for Microbiology 2009 Journal of Bacteriology and Virology Vol.39 No.4
To find whether productivity of bacteriocin is controlled between different species under unusual cultural conditions, we used Rhodobacter capsulatus ATCC 17016 as a producer and Rhodopseudomonas palustris ATCC 17003 as an indicator. Rhodobacter capsulatus was cultured under aerobic conditions in the dark in Lascelles medium containing 0.3% Triton X-100. As a result, bacteriocin productivity increased enormously. The optimal pH range of bacteriocin production was 6~7.8. Through partial purification of bacteriocin, the molecular weight was roughly estimated at 14 kDa. Plasmid had no influence on bacteriocin production by Rhodobacter capsulatus. Our findings indicate that culture conditions affect bacteriocin productivity between more distantly related species, and bacteriocin of Rhodobacter capsulatus is not encoded by a plasmid.
Risk factors for MDRD-GFR of less than 60 mL/min per 1.73 m<sup>2</sup> in former kidney donors
LEE, JANG HAN,KIM, SONG CHEOL,HAN, DUCK JONG,CHANG, JAI WON,YANG, WON SEOK,PARK, SU KIL,LEE, SANG KOO,PARK, JUNG SIK,KIM, SOON BAE Blackwell Publishing Asia 2007 Nephrology Vol.12 No.6
<P>SUMMARY:</P><P>Background: </P><P>Although several previous studies have reported that kidney donors are not at increased risk for adverse effects, some donors have been found to progress to chronic kidney disease (CKD). We retrospectively evaluated the risk factors for estimated glomerular filtration rate (GFR) from abbreviated Modification of Diet in Renal Disease (MDRD) equation (MDRD-GFR) of less than 60 mL/min per 1.73 m<SUP>2</SUP> in kidney donors.</P><P>Methods: </P><P>Of the 756 individuals who underwent open donor nephrectomy between 27 June 1990 and 30 April 2001, 104 had follow-up records for 50 months or more. MDRD-GFR of 60 mL/min per 1.73 m<SUP>2</SUP> at final follow up divided these individuals into a normal group (<I>n</I> = 78) and a CKD-GFR group (<I>n</I> = 26). We compared several clinical parameters between the two groups at baseline and follow up to evaluate the risk factors for MDRD-GFR of less than 60 mL/min per 1.73 m<SUP>2</SUP> in kidney donors.</P><P>Results: </P><P>The CKD-GFR group was significantly older than the normal group at baseline (47 ± 12 <I>vs</I> 41 ± 11 years old, <I>P</I> = 0.02). Hypertension was more prevalent in the CKD-GFR group at baseline (15% <I>vs</I> 2%, <I>P</I> = 0.005). Binary logistic regression analysis showed that age (Odds ratio (OR) 1.06, 95% confidence interval (CI) 1.01–1.10) and hypertension (OR 7.91, 95% CI 1.13–55.2) at baseline were independent risk factors for MDRD-GFR of less than 60 mL/min per 1.73 m<SUP>2</SUP>. At final follow up, the prevalence rates of hypertension (31% <I>vs</I> 8%, <I>P</I> = 0.006) and proteinuria (15% <I>vs</I> 0%, <I>P</I> = 0.003) were significantly higher in the CKD-GFR group.</P><P>Conclusion: </P><P>Older kidney donors and those with hypertension were significantly more likely to have a MDRD-GFR of less than 60 mL/min per 1.73 m<SUP>2</SUP>.</P>