Application of a wet oxidation method for the quantification of ³H and ¹⁴C in low-level radwastes

Ahn, H.J.,Song, B.C.,Sohn, S.C.,Lee, M.H.,Song, K.,Jee, K.Y. Pergamon Press ; Elsevier Science Ltd 2013 Applied radiation and isotopes Vol.81 No.-

Wet oxidation methods are utilized to separate and quantify <SUP>3</SUP>H and <SUP>14</SUP>C radionuclides in inorganic and organic radwastes generated at nuclear facilities. Because <SUP>3</SUP>H and <SUP>14</SUP>C are pure beta emitters with half-lives of 12.3 and 5,730 years, respectively, these radionuclides should be chemically separated from other radionuclides present in radwastes for accurate quantification. In particular, a collection technique for <SUP>14</SUP>C radionuclide in radwastes is needed because it is converted into <SUP>14</SUP>CO<SUB>2</SUB> gas by an oxidation reaction. To confirm the recoveries of <SUP>3</SUP>H and <SUP>14</SUP>C, various standard radioactive sources were used to verify the proposed method. Because the majority of <SUP>3</SUP>H radionuclides are distributed in tritiated water (HTO), only tritiated water was used as a standard for <SUP>3</SUP>H radionuclides. Additionally, <SUP>14</SUP>C-labeled methanol (<SUP>14</SUP>CH<SUB>3</SUB>OH), lauric acid (<SUP>14</SUP>CH<SUB>3</SUB>(CH<SUB>2</SUB>)<SUB>10</SUB>COOH), sodium bicarbonate (NaH<SUP>14</SUP>CO<SUB>3</SUB>), and toluene (C<SUB>6</SUB>H<SUB>5</SUB><SUP>14</SUP>CH<SUB>3</SUB>) were used as <SUP>14</SUP>C standards. The compounds were oxidized with chemical oxidants and then separated. The individual species were mixed with a scintillation cocktail and counted using a liquid scintillation counter. The recoveries of <SUP>14</SUP>C and <SUP>3</SUP>H were 82-97% and 98%, respectively. The wet oxidation method will be applied to RI wastes for clearance.

Modified iliac screw fixation: technique and clinical application

Sohn, S.,Chung, C. K.,Kim, Y. J.,Kim, C. H.,Park, S. B.,Kim, H. Springer-Verlag 2016 Acta neurochirurgica Vol. No.

<P>A conventional iliac bolt and the S2 alar iliac screw fixation technique (S2AI) are commonly used sacropelvic fixation techniques. However, conventional iliac bolt technique requires a lateral connector and commonly has prominent screw head problems. S2AI reportedly has a high instrument failure rate. We aim to introduce a modified iliac screw fixation technique and to investigate its clinical application in adult patients. The entrance site of the modified iliac screw fixation technique was 1 cm medial and 1 cm caudal from the posterosuperior iliac spine. From 2009 to 2015, ten adult patients underwent sacropelvic fixation with the modified iliac screw fixation technique in our spine clinic. A minimum 12-month clinical and radiographic follow-up was adopted. The mean follow-up period was 30.7 months (12-74 months). Mean number of fixation levels was 7.7 segments (5-10 segments). Postoperatively, the C7 plumb line (SVA) was significantly decreased (P = 0.04). Upon the last X-ray, SVA did not differ between postoperative and the last X-ray (P = 0.1). There was no breakage during our follow-up period. There was no prominent screw head. There were no cases requiring implant removal. The modified iliac screw fixation technique does not cause prominence in the sacral region, and does not require a lateral connector, both of which are necessary when using the classical iliac bolt technique. This technique also avoids the acute angle between the screw head and the shaft of the screw commonly seen in S2AI. The modified iliac screw fixation technique can be an effective alternative for sacropelvic fixation.</P>

Anti-obesity effect of Crinum asiaticum var. japonicum Baker extract in high-fat diet-induced and monogenic obese mice

Jeong, Y.J.,Sohn, E.H.,Jung, Y.H.,Yoon, W.J.,Cho, Y.M.,Kim, I.,Lee, S.R.,Kang, S.C. Masson Pub. USA, Inc 2016 Biomedicine & pharmacotherapy Vol.82 No.-

<P>This study determined the anti-obesity effect of Crinum asiaticum var. japonicum Baker extract (CAE) on adipocytes and obese mice. The inhibitory effects of CAE on adipocyte differentiation and adipogenesis were determined using differentiation induction medium in 3T3-L1 cells. To get an insight into underlying molecular actions of CAE, we investigated the changes in the expression levels of genes involved in lipogenesis by CAE treatment using qRT-PCR. CAE strongly suppressed adipocyte differentiation through downregulation of PPAR gamma, C/EBP alpha, C/EBP beta, and aP2. CAE treatment could also suppress the expression levels of ACC, FAS, LPL and HMGCR gene in 3T3-L1 cells. Male C57BL/6 strain and C57BL/6J-ob/ob strain mice were fed with HFD containing 60% fat and normal diet in the presence or absence of 25, 50, and 100 mg/kg CAE for 7 weeks. CAE supplementation could highly suppress the body weight gain and epididymal fat accumulation without changes in food uptake in both obese models. Increases in total cholesterol, LDL-cholesterol and triglyceride were highly suppressed in the presence of CAE. In summary, CAE has an anti-obesity effect and this anti-obesity potential might be associated with downregulation of genes involved in adipocyte differentiation and lipogenesis. Crown Copyright (C) 2016 Published by Elsevier Masson SAS. All rights reserved.</P>

Elevated high-mobility group B1 levels in active adult-onset Still’s disease associated with systemic score and skin rash

Jung, J. Y.,Suh, C. H.,Sohn, S.,Nam, J. Y.,Kim, H. A. Springer Science + Business Media 2016 CLINICAL RHEUMATOLOGY Vol.35 No.8

<P>High-mobility group box-1 (HMGB1) is a nuclear protein, and such prototypical damage-associated molecular patterns mediate the immune response in the noninfectious inflammatory response. Adult-onset Still's disease (AOSD) is a systemic inflammatory disorder involved in the dysregulation of innate immunity. We investigated the serum HMGB1 level in patients with AOSD and evaluated its clinical significance. Blood samples were collected from 40 patients with active AOSD and 40 healthy controls (HC). Of the patients with AOSD, follow-up samples were collected from 16 patients after a resolution of AOSD disease activity. Serum HMGB1 levels in patients with AOSD were higher than those of the HC (10.0 +/- 5.85 vs. 5.15 +/- 1.79 ng/mL, p < 0.001). Serum HMGB1 levels were found to be correlated with C-reactive protein (CRP) and the systemic score. The AOSD patient who had a sore throat showed a higher serum HMGB1 level than those patients who did not, and the patient with a skin rash had higher levels than the patients without. In addition, the serum HMGB1 levels were decreased after the resolution of disease activity in the AOSD patients who were followed up. The serum HMGB1 levels were elevated in AOSD patients compared to the HC and were correlated with both CRP and the systemic score. The HMGB1 levels were associated with skin rash and a sore throat in AOSD patients. After the resolution of disease activity, serum HMGB1 levels were found to have decreased.</P>

방사성동위원소심혈관조영술상 관찰된 주폐동맥유와 동맥관개존증이 병발된 1예

조보연,이명철,고창순,한만청,손인,윤용수,홍창의,노준량,연경모 대한핵의학회 1981 핵의학 분자영상 Vol.15 No.2

A Case of main pulmonary artery aneurysm in a 9-year-old boy with patent ductus arteriosus is presented. In this case presented with a huge mass density on the chest X-ray, radionuclide cardiac angiography showed a vascular lesion, which was confirmed as an aneurysm of the main pulmonary artery at roentgenologic angiogram. The aneurysm appeared following an episode of bacterial endocarditis and pulmonary hypertension. A successfu1 aneurysmectomy with multiple ligation of ductus arteriosus was performed.

Electronic and steric effects controlling efficiencies of photoaddition reactions of fullerene C₆₀ with N-α-trimethylsilyl-N-alkyl-N-benzylamines

Jeong, H.C.,Lim, S.H.,Sohn, Y.,Kim, Y.I.,Jang, H.,Cho, D.W.,Mariano, P.S. Pergamon Press ; Elsevier Science Ltd 2017 Tetrahedron letters: the international organ for t Vol.58 No.10

Single electron transfer (SET)-promoted photoaddition reactions between fullerene C<SUB>60</SUB> and both various alkyl (Me, Et, i-Pr, t-Bu)- and para-substituted (p-Me, p-OMe, p-F, p-CF<SUB>3</SUB>) arene ring containing, N-α-trimethylsilyl-N-alkyl-N-benzylamines were explored to gain information about photoproduct profiles and how the electronic and steric nature of the amine substrates influence reaction efficiencies. The results show that visible light (λ>540nm) irradiation of 10% EtOH-toluene solutions containing C<SUB>60</SUB> and N-α-trimethylsilyl-N-alkyl-N-benzylamines produce 1-aminomethyl-1,2-dihydrofullerenes as a sole photoproduct. In addition, SET-promoted photoaddition reactions of unsubstituted and para-electron donating group substituted arene ring containing N-α-trimethylsilyl-N-alkyl-N-benzylamines take place to give photoproducts more efficiently than those containing para-electron withdrawing group substituted arene rings. Moreover, although steric factors are less significant than the electronic nature of the amine substrates in governing reaction efficiencies, sterics do play a significant role in photoreactions of electron deficient amine substrates.

성장생물학 : C6 Rat Glioma Cell에서 리튬에 의한 성장 억제와 Insulin-like Growth Factor System Components의 발현과의 관계

김인애 ( I. A. Kim ),진은정 ( E. J. Jin ),조은정 ( E. J. Cho ),손시환 ( S. H. Sohn ),이철영 ( C. Y. Lee ) 한국축산학회 2004 한국축산학회지 Vol.46 No.4

유전 및 육종 : 칡소의 염색체 양상과 핵형 분석

손시환(S . H . Sohn),이철영(C . Y . Lee),김두환(D . H . Kim),박구부(G . B . Park),이정규(J . G . Lee),신철교(C . K . Shin),정희식(H . S . Chung),곽석준(S . C . Kwack),박명구(M . K . Park),천민성(M . S . Chun),백철승(C . S . Baik),고영두 한국축산학회 2000 한국축산학회지 Vol.42 No.1

The Korean Native Stripped Cattle known as Chickso have distinctive black hair belts all over the body to varying extents on a Hanwoo(Korean Cattle)-like yellowish brown background. These Battle are remaining only in a limited area of this country and are known to yield a flavorful meat somewhat distinct from that of Hanwoo, but their genetic lineage has not been identified. We have carried out karyotyping of these cattle firm the lymphocyte culture. Blood samples were collected from 20 of male and female cattle that had been bred at Poongjeon Farm located in Kosong, Kyongnam, and were subjected to chromosomal morphology and G- and C-banding analysis. Chickso, like Hanwoo, had 58 autosomes and X and Y sex chromosomes which were morphologically very similar to those of the latter. All the 58 autosomes revealed almost a zero value of centromeric index, suggesting that they are acrocentric; sex chromosomes X and Y were submetacentric and metacentric, respectively. Following G-banding, the light bands appeared near the centromeric site in all the autosomes whereas the specific dark bands were consistently visible in each homologous chromosome. Overall, the G-banding pattern was nearly identical between the Chickso and Hanwoo. C-bands representing the heterochromatin were present at or near the centromere in all the autosomes, whereas in sex chromosomes, they were found distributed on variable sites. The proportion of constitutive heterochromatin ranged 20∼30%. These patterns were not significantly different between the two subspecies. All of these cytogenetic results suggest that the distinctive traits of Chickso did not arise from a cytogenetic variation from Hanwoo, i. e. the former is simply a subpopulation of the latter. As such, we propose that selection and propagation of the Chickso based on economic traits may be advantageous to the domestic beef industry.

Polymeric light delivery via a C-shaped metallic aperture

Cho, E.-H.,Kang, S.-M.,Leen, J.B.,Suh, S.-D.,Sohn, J.-S.,Moon, C.-Y.,Park, N.-C.,Hesselink, L.,Park, Y.-P. OPTICAL SOC- AMERICA 2010 Journal of the Optical Society of America B Vol.27 No.7

Battery performance of PMMA-grafted PE separators prepared by pre-irradiation grafting technique

Gwon, S.J.,Choi, J.H.,Sohn, J.Y.,Lim, Y.M.,Nho, Y.C.,Ihm, Y.E. Korean Society of Industrial and Engineering Chemi 2009 Journal of industrial and engineering chemistry Vol.15 No.5

Poly(methyl methacrylate)-grafted polyethylene (PE-g-PMMA) separators were prepared by pre-irradiation grafting technique of methyl methacrylate onto a commercial polyethylene separator. The prepared separators were characterized by using charge/discharge (C/D) cycling test, AC impedance, and thermal stability analyses. Thermal shrinkage (TS) of the PE-g-PMMA separators decreased with an increasing degree of grafting up to 70% above which it was saturated. The PE-g-PMMA separators showed a better oxidation stability on the anode up to 5V and a better cycle life performance than the original PE separator. These characteristics make the prepared separators suitable for applications in high voltage secondary lithium batteries.