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폐포 대식세포 및 단핵구가 Interleukin-2 Enhanced Natural Killer 및 LAK Activity에 미치는 영향
조철호 ( Jo Cheol Ho ),김병일 ( Kim Byeong Il ),김세규 ( Kim Se Gyu ),천선희 ( Cheon Seon Hui ),김형중 ( Kim Hyeong Jung ),장준 ( Jang Jun ),안철민 ( An Cheol Min ),김성규 ( Kim Seong Gyu ),이원영 ( Lee Won Yeong ),윤정구 ( Yun J 대한내과학회 1992 대한내과학회지 Vol.42 No.5
Alveolar macrophages (AM) are thought to function as primary effector cells against tumors growing in the lung. Systemic administration of lymphokine activated killer (LAK) cells and IL-2 resulted in partial antitumor response in patients with advanced cancer. LAK activity is influenced by various factors. We studied the effects of AM and blood monocytes from healthy donors on IL-2 enhanced NK activity against K-562 cells and LAK activity against Raji cells utilizing a 4h ^(51)Cr release assay. The following results were obtained: 1) The addition of different doses of human blood monocytes showed no suppression or enhancement of IL-2 enhanced NK and LAK activity. 2) The addition of high dose of AM (Lymphocyte: AM=1:1) significantly suppressed IL-2 enhanced NK activity. Smaller doses of AM (Lymphocyte: AM= 10:1and 100:1) did not suppress IL-2 enhanced NK activity. 3) The addition of high dose of AM (Lymphocyte: AM = 1:1 and 10:1) significantly suppressed LAK activity. The smallest dose of AM (Lymphocyte: AM= 100:1) did not suppress LAK activity. In conclusion, IL-2 enhanced NK and LAK activity were dose-dependently suppressed by human alveolar macrophages. However IL-2 enhanced NK and LAK activity were not suppressed by blood monocytes.
반응표면분석법을 이용한 염색폐수의 광촉매 산화 처리조건의 최적화
조일형 ( Jo Il Hyeong ),박재홍 ( Park Jae Hong ),김영규 ( Kim Yeong Gyu ),이홍근 ( Lee Hong Geun ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.3
In order to treat the dyeing wastewater, the UV/TiO₂/H₂O₂ system was investigated, and proper protreatment methods were examined to reduce the load on the system considering economical and techical efficiency. Also, to obtain the maximize the removal efficiency of dyeing wastewater, optimal operating conditions for the photocatalytic degradation were investigated by using the responsed surface methodology(RSM) . The independent variables were TiO₂ dosage, H₂O₂ concentration and removal efficiency of dyeing wastewater was dependent variable. With the 2²-factional factorial experimental design, 11 experiments were carried out at various condition, with 4 factorial points, 3 center points and 4 axial points. Maximum removal efficiency(85%) of dyeing wastewater was obtained at TiO₂ dosage(1.82g/L), H₂O₂ concentration (980㎎/L) for photocatalytic oxidation reaction(20min).
( Il Kyu Cho ),( Musfiqur Rahman ),( Jae Ung Seol ),( Hyun Ho Noh ),( Hyeong-wook Jo ),( Joon-kwan Moon ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.4
BACKGROUND: The residual analysis of polar pesticides has remained a challenge. It is even more difficult to simultaneously analyze multiple polar pesticides. Diquat, paraquat, and chlormequat are typical examples of highly polar pesticides. The existing methods for the analysis of diquat, paraquat and chlormequat are complex and time consuming. Therefore, a simple, quick and effective method was developed in the represent study for simultaneous analysis of diquat, paraquat and chlormequat in animal products, meat and fat using UPLC-MS/MS. METHODS AND RESULTS: Sample extraction was carried out using acidified acetonitrile and water and reextracted with acidified acetonitrile and combine the extracts followed by centrifugation. The extract was then cleaned up with a HLB cartridge after reconstitution with acidic acetonitrile and water. The method was validated in quintuplicate at three different concentrations. The limits of detection (LOD) and quantification (LOQ) were 0.0015 and 0.005 mg/L, respectively. Matrix suppression effect was observed for all of the analytes. A seven point matrix matched calibration curve was constructed for each of the compound resulted excellent linearity with determination coefficients (R<sup>2</sup>) ≥ 0.991. Accuracy and precision of the method was calculated from the recovery and repeatability and ranged from 62.4 to 119.7% with relative standard deviation less than 18.8%. CONCLUSION: The recovery and repeatability of the developed method were in the acceptable range according to the Codex Alimentarius guideline. The developed method can be applied for the routine monitoring of diquat, paraquat, and chlormequat in animal products, meat and fat.
Kim Il-Hwan,Jang Jun-Hyeong,Jo Su-Kyoung,No Jin Sun,Seo Seung-Hee,Kim Jun-Young,Jung Sang-Oun,Kim Jeong-Min,Lee Sang-Eun,Park Hye Kyung,Kim Eun-Jin,Jeon Jun Ho,Choi Myung-Min,Ryu Boyeong,Jang Yoon Suk 질병관리본부 2020 Osong Public Health and Research Persptectives Vol.11 No.5
Objectives The Korea Centers for Disease Control and Prevention has published “A Guideline for Unknown Disease Outbreaks (UDO).” The aim of this report was to introduce tabletop exercises (TTX) to prepare for UDO in the future. Methods The UDO Laboratory Analyses Task Force in Korea Centers for Disease Control and Prevention in April 2018, assigned unknown diseases into 5 syndromes, designed an algorithm for diagnosis, and made a panel list for diagnosis by exclusion. Using the guidelines and laboratory analyses for UDO, TTX were introduced. Results Since September 9th, 2018, the UDO Laboratory Analyses Task Force has been preparing TTX based on a scenario of an outbreak caused by a novel coronavirus. In December 2019, through TTX, individual missions, epidemiological investigations, sample treatments, diagnosis by exclusions, and next generation sequencing analysis were discussed, and a novel coronavirus was identified as the causal pathogen. Conclusion Guideline and laboratory analyses for UDO successfully applied in TTX. Conclusions drawn from TTX could be applied effectively in the analyses for the initial response to COVID-19, an ongoing epidemic of 2019 – 2020. Therefore, TTX should continuously be conducted for the response and preparation against UDO.
Polyphosphide Precursor for Low-Temperature Solution-Processed Fibrous Phosphorus Thin Films
Ban, Hyeong Woo,Oh, Jong Gyu,Jo, Seungki,Jeong, Hyewon,Gu, Da Hwi,Baek, Seongheon,Lee, Song Yeul,Park, Yong Il,Jang, Jaeyoung,Son, Jae Sung American Chemical Society 2019 Chemistry of materials Vol.31 No.15
<P>Crystalline red phosphorus has very recently emerged as a stable and cost-effective semiconductor material. However, despite its potentiality in electronics and optoelectronics, the widespread application of this material is still hampered by the limited synthetic route of the ampoule-based chemical vapor deposition that critically requires mineralizing agents. To address this issue, we report the chemical synthesis of soluble polyphosphide precursors that serve as inks for the solution-processed fabrication of crystalline fibrous phosphorus thin films. The purified polyphosphide precursor formed crystalline fibrous phosphorus via thermal annealing at a temperature as low as 250 °C without any mineralizing agents. This anionic polyphosphide functioned as a surface-capping ligand for nanoparticles including metals, semiconductors, and magnets. Therefore, the study investigates the possibility of solution-processed fibrous phosphorus thin films as active channel layers in field-effect transistors as well as photodetectors and demonstrates their initial performances on the charge-transport and photoresponsive characteristics of these devices. The effect of semiconducting PbS nanoparticles embedded in the fibrous phosphorus thin films on device performance was also studied. The synthesized polyphosphide precursor offers a vast opportunity for the facile preparation of crystalline red phosphorus and chemical design of nanoparticles.</P> [FIG OMISSION]</BR>
Kim, Hyeong In,Seo, Ji Yeon,Jeung, Seung Jo,Park, Sae Gwang,Yang, Young Il Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342 No.-
<P>Fibrin is a natural substrate for growth, adhesion, and migration of mature endothelial cells (ECs) and a candidate coating material in approaches to graft endothelialization. Adipose tissue represents an abundant, practical source of donor tissue for stem cells which may be a useful source for engineering of vascular grafts. However, the optimal substrates that promote differentiation of adipose tissue-derived stem cells (ASCs) into ECs remain to be elucidated. In the present study, we investigated whether fibrin can be used as a substratum to support in vitro ECs differentiation of ASCs and whether fibrinogen concentration can be affect on ECs differentiation of ASCs. For determination of phenotypic characteristics of ASCs used in this experiment, we performed flow cytometry analysis. ASCs were plated on fibrin composed of varying concentrations of fibrinogen and induced into ECs differentiation in presence of VEGF. Before inducing into ECs, ASCs did not express any markers of hematopoietic cells (CD34, CD45), ECs (CD31, CD34), and endothelial progenitor cells (CD34, CD133, Flk-1). The degree of ECs differentiation was determined by capillary network formation, ECs-specific gene expression, and F-actin assembly. During the first 12 h after seeding, cells spread randomly, moved and formed small interconnected clusters. These clusters decreased in size and formed a capillary tube at 48 h. During the further incubation in presence of VEGF for 7 days, ASCs expressed mRNA and protein of von Willebrand factor (vWF). The degree of ECs differentiation of ASCs was consistently decreased as fibrinogen concentration increase. Fibrin may be used as biomatrix to promote differentiation of ASCs into ECs for tissue engineering.</P>
( Young Il Jo ),( Ha Young Na ),( Ju Young Moon ),( Sang Woong Han ),( Dong Ho Yang ),( Sang Ho Lee ),( Hyeong Cheon Park ),( Hoon Young Choi ),( So Dug Lim ),( Jeong Hae Kie ),( Yong Kyu Lee ),( Sug 대한내과학회 2016 The Korean Journal of Internal Medicine Vol.31 No.2
Background/Aims: Immunoglobulin A nephropathy (IgAN) is a generally progressive disease, even in patients with favorable prognostic features. In this study, we aimed to investigate the antiproteinuric effect and tolerability of lowdose valsartan (an angiotensin II receptor blocker) therapy in normotensive IgAN patients with minimal proteinuria of less than 0.5 to 1.0 g/day. Methods: Normotensive IgAN patients, who had persistent proteinuria with a spot urine protein-to-creatinine ratio of 0.3 to 1.0 mg/mg creatinine, were recruited from five hospitals and randomly assigned to either 40 mg of valsartan as the low-dose group or 80 mg of valsartan as the regular-dose group. Clinical and laboratory data were collected at baseline, and at 4, 8, 12, and 24 weeks after valsartan therapy. Results: Forty-three patients (low-dose group, n = 23; regular-dose group, n = 20) were enrolled in the study. Proteinuria decreased significantly not only in the regular-dose group but also in the low-dose group. The change in urine protein-to-creatinine ratio at week 24 was -41.3% ± 26.1% (p < 0.001) in the regular- dose group and -21.1% ± 45.1% (p = 0.005) in the low-dose group. In the lowdose group, blood pressure was constant throughout the study period, and there was no symptomatic hypotension. In the regular-dose group, blood pressure decreased at weeks 8 and 12. No significant change in glomerular filtration rate, serum creatinine level, or serum potassium level was observed during the study period. Conclusions: Our results suggest that low-dose valsartan can significantly reduce proteinuria without causing any intolerability in normotensive IgAN patients with minimal proteinuria.