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HPLC 시스템을 이용한 大氣中 多核芳香族 炭化水素의 定量에 關한 硏究
정재필,황승만,박철용,백성옥 嶺南大學校 工業技術硏究所 1991 연구보고 Vol.19 No.1
In this study, an analytical procedure was evaluated for the determination of atmospheric PAH, both in gaseous and particulate phases. The method involves Soxhlet extraction of the filters and Tenax adsorbent, followed by a clean-up stage using a silica mini column prior to analysis by reversephase HPLC with wavelength programmable fluorescence and UV detection. A total of 18 PAH were identified and quantified, all of which have been of environmental concern. In order to validate the methodology and to ensure compatibility of the results, the analytical method used for the determination of PAH was evaluatd with respect to the efficiencies of extraction and clean-up procedure, HPLC separation, and lower limits of detection. In addition, substrate dependency of PAH recovery was also investigated for the two type of filter(glass fiber and PTEF filters) and Tenax adsorbent.
비확공성 골수강내 금속정을 이용한 폐쇄성 경골 간부 골절의 치료
정필현,황정수,채동주,문상호 東國大學校 1998 東國論叢 Vol.37 No.-
Most of closed fractures of the tibial shaft can be treated successfully with medullary nails. Reamed intramedullary nailing technique has become a good alternative method in treating the close tibial fracture. Unreamed interlocking intramedullary nailing has been employed successfully in the treatment of open tibial fractures. This study was undertaken to evaluate the result of interlocking intramedullary nailing without reaming in the treatment of closed fractures of the tibial shaft. From 1995 through 1998, fifty four cases of the closed, displace tibial fractures were treated by an unreamed intramedullary nailing and the average follow-up period was 1 year and 5 months(ranged from 12 months to 27 months). The results were as follows : 1. Fifty four cases were treated with closed, unreamed nailing technique and the nail which has 1mm smaller diameter than isthmic width of unaffected tibia was choosen. 2. The average time to bony union was achieved at 17 weeks without abundant periosteal b callus formation. 3. Eight tibiae were required the additional procedure such as autogenous bone graft, skin graft or local skin flap. We also have observed the screw breakage of ten tibiae but there were no intraoperative jamming or incarceration and no significant complicaton such as bending or breakage of the nail, shortening or non-union of the fractures. In conclusion, unreamed technique is an attractive method to treat the close, displaced fractures of the tibial shaft. 경골 간부 골절의 치료에 있어서 견고한 내 고정으로 조기 관절운동 및 체중 부하를 통해 골절 유합 및 기능 회복을 도모할 수 있는 골수강내 금속정 고정술이 널리 사용되어지고 있다. 골수강내 금속정술의 장점은 술 후 조기 관절운동과 체중 부하가 가능하여 이환율(morbidity)을 감소시키며 불유합의 발생률이 낮아는 것이다. 경골 간부 골절의 치료에 있어서 비확공성 금속정 고정술은 주로 심한 연부 조직 손상을 동반한 골절 및 개방성 골절의 치료에 적용되어지고 있으며, 대부분의 폐쇄성 경골 간부 골절의 치료로는 골수강 확공 후 골수강을 충만시키는 금속정을 삽입하는 확공정 금속정 고정술이 시행되어지고 있는 경향이다. 저자들은 폐쇄성 경골 간부 골절에 대해서 비확공성 금속정 고정술의 유용성 여부를 알아보기 위해서 동국대학교 의과대학 정형외과학교실에서 치료했던 54례를 평균 1년 5개월 추시하여 골 유합 기간, 합병증의 발생에 대해서 분석하였다. 본 연구에서 비확공성 금속정 고정술시 골 유합 기간은 확공성 금속정 고정술시와 비교하여 유의한 차이가 없음을 알 수 있었으며, 확공을 하지 않음으로써 발생할 수 있는 jamming이나 가는 직경의 금속정을 선택함으로써 우려되는 금속정의 휨, 부러짐 등의 합병증은 발생하지 않았다. 결론적으로 폐쇄성 경골 간부 골절의 치료에 있어서도 비확공성 골수강내 금속정 고정술은 유용한 방법으로 사료된다.
용해성 poly(dimethy-co-diphenylsilane)공중합체의 특성과 열분해에 관한 연구
강필현,양현수,황택성,김봉만,권오현 忠南大學校 産業技術硏究所 1993 산업기술연구논문집 Vol.8 No.2
Soluble poly(dimethyl-co-diphenylsilane)copolymer,[(SiMe₂)x(SiPh₂)1-x]n where x=0.5 to 0.9., was synthesized by condensation polymerization of dimethyldichlorosilane and diphenyldichlorosilane in xylene. In the TG analysis of the copolymer, weight loss started at 170℃ and the weight residue at 1000℃ was 32%. The copolymer was stabilized by thermal oxidation at 80 to 110℃ for 5 hr. in air, and its thermal stability increased as the temperature increased. The copolymer heat treated above 700℃ showed no organic bonds of C-H and Si-CH₃. while Si-C, and Si-O large bonds were observed. Amorphous SiC was obtained by pyrolysis at 1000℃ and β-SiC at 1200 to 1400℃, in which a better crystallinity of β-SiC was observed at a higher temperature.
Sang-Min Yeo,Yeo-Tae Yun,Chong-Tae Chung,Jung-Phil Seo,Hae-Hwang Kim,Sang-Nag Ahn 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
The objective of this study were to identify QTLs for agronomic traits using a set of introgression lines carrying wild rice (Oryza rufipogon) segment in cultivated rice (ssp. japonica cv. Hwaseongbyeo). Ninety-six ILs were evaluated for seven agronomic traits, amylose and protein contents. The proportion of the recurrent genome in ILs ranged from 87.8 to 100%, with an average of 96.7%. The mean number of homozygous and heterozygous donor segments were 2 (ranging 0-7) and 1.7 (ranging 0-6), respectively, and the majority of these segments had size less than 10 cM. A total of 22 quantitative trait loci were identified for 9 traits and each QTL explained 7.2% to 56.6% of the phenotypic variance. Some QTLs were clustered in a few chromosomal regions. A first cluster was located near RM527 on chromosome 6 with QTLs for culm length, panicle length, days to heading, 1000-grain weight and protein content. Three ILs with high spikelets per panicle compared to the recurrent parent were selected to detect and fine map the wild segments responsible for this variation. The results will be discussed.
기관지 과민반응이 있는 환자에서 기관지 확장제 흡입후 동맥혈 가스분석치와 폐기능 검사치의 변화에 관한 연구
안필상(Phil Sang Ahn),황찬교(Chan Gyo Hwang),방문권(Mun Kweon Bang),이종진(Jong Jin Lee),김상섭(Sang Seop Kim),김주옥(Ju Ock Kim),김선영(Sun Yong Kim) 대한내과학회 1988 대한내과학회지 Vol.35 No.4
N/A Some debates has been going on regarding changes in the values of pulmonary function test and arterial blood gas analysis after bronchodilator inhalation. A study was performed to evaluate the changes of the pulmonary function test (VC-FVC, VC, FVC, FEV1, FEV1/ FVC%) and arterial blood gas analysis (pH, Paco2, Pao2 BE, Sao2,, HCO3,) after bronchodilator inhalation in 44 patients with bronchial hypersensitivity. The results were summarized as follows: 1) The negative response group did not show change in the values of both the pulmonary function test and arterial blood gas analysis. 2) The positive response group did not show change in the values of the arterial blood gas analysis after bron-chodilator inhalation, but did show significantly increase in the order of FEV1, VC and FVC1, but not in VC-FVC and FEV1/FVC%. 3) On comparison of the two groups, there were no differences in the values of the pulmonary function test but there were differences in pH before bronchodilator inhalation and in pH and B.E. after bronchodilator inhalation. These findings indicate that there were no significant changes in the parameters of the arterial blood gas analysis in both groups after bronchodilator inhalation but various parameters (FEVVC, FVC) of the pulmonary function test were significantly increased after bronchodilator inhalation in the positive response group.
Chung, Phil-Sang,He, Peijie,Shin, Jang-In,Hwang, Hee-Jun,Lee, Sang Joon,Ahn, Jin-Chul Landes Bioscience 2009 Cancer Biology & Therapy Vol.8 No.14
<P>Skin phototoxicity is one of the main side effects of photodynamic therapy (PDT). To overcome this problem, some new photosensitizers have been developed with longer absorbance wavelengths and shorter half-life in the body. In this study, we investigated the mechanism of PDT mediated by a new chlorophyll derivative photosensitizer, 9-hydroxypheophorbide alpha (9-HPbD), on AMC-HN-3 cancer cells. Phototoxicity and apoptosis on AMC-HN-3 cells induced by 9-HPbD was exhibited in a time- and dose-dependent manner. Mitochondria and endoplasmic reticulum (ER) were observed as preferential sites of 9-HPbD accumulation. Photoactivation of 9-HPbD-loaded AMC-HN-3 cells led to a rapid generation of reactive oxygen species (ROS) at 30 min, followed by a loss of mitochondrial membrane potential (MMP) at 2 h, translocation of apoptosis-inducing factor (AIF) at 2 h, and the release of cytochrome c at 3 h following PDT. Caspase-12, an important caspase involved in ER-induced apoptosis, and C/EBP homologous protein (CHOP), an ER stress inducible transcription factor, were also upregulated after PDT (3-12 h and 6-12 h, respectively). Subsequently, activation of caspase-9 at 6 h, caspase-3 and PARP at 12 h also occurred in PDT-treated AMC-HN-3 cells. The above observations demonstrate that both mitochondria and ER serve not only as the sites of sensitizer binding, but also the subcellular targets of 9-HPbD-PDT, effective activation of which is responsible for 9-HPbD PDT-induced apoptosis in AMC-HN-3 cells.</P>
황정수,정필현,강석,김종필,김영성,곽주영 東國大學校醫學硏究所 2005 東國醫學 Vol.12 No.1
인공 고관절 전치환술 후에 발생하는 합병증들에 대해서 여러 가지가 알려져 있다. 저자들은 54세 여자 환자에서 인공 고관절 전치환술 후에 골용해로 인해 발생한 대퇴골 근위부의 가성 낭종 1례를 드물게 체험하여 긴 대퇴 스템을 사용한 인공 고관절 재치환술, 골이식 및 시멘트 충전술을 사용하여 치료한 증례를 문헌고찰과 함께 보고하는 바이다. Many complications after total hip replacement arthroplasty are well known. We experienced a rare case of pseudocyst developed by osteolysis at proximal femur after total hip replacement arthroplasty. We report the case treated by revision total hip replacement arthroplasty using long femoral stem, autogenous and allogenous bone graft, and cementation for cyst cavity.