• 한국식품영양과학회지
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• 제29권4호
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• pp.726-731
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• 2000

본 연구에서는 단 삼(Salvia miltiorrhiza)의 추출물이 인체 결장암세포인 HT-29, 간암세포인 HepG2 및 직장 암세포인 HRT-18의 증식에 미치는 영향을 in vitro에서 확인하였다. 암세포의 배양액에서 단삼의 수용성 추출물과 에탄올 추출물의 암세포 증식억제효과는 농도에 비례하여 에탄올 추출물에서 더 효과적이었다. 이를 토대로 단삼의 에탄올 추출물의 급성독성, 수명연장 및 고형암형 성억제를 살펴보기 위해 in vivo 실험을 하였다. 급성독성실험결과 대조군의 15일 째의 평균체중은 32.3 g 이었고 실험군은 31.6 g으로 정상적인 상태를 유지하였으며, 흰쥐의 육종암세포인 sarcoma-180를 접종한 mouse의 수명연장실험결과 대조군에 비해 61%의 수 명연장 효과가 있음을 관찰하였다. 고형암억제 실험 결과에서도 대조군에 비해 에찬올 추출 물 처리군이 35%의 고형암 형성억제능을 나타내었다. 따라서 단삼의 에탄올 추출물 중에는 in vitro와 in vivo 실험을 통해 항암활성을 갖는 성분이 존재하며, 이성분은 유효한 항암제 로 개발될 수 있으리라 사료된다.

• 한국환경과학회지
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• 제26권1호
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• pp.67-78
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• 2017

Combustion of ethanol (EtOH) at low temperatures has been studied using titania- and silica-supported platinum nanocrystallites with different sizes in a wide range of 1~25 nm, to see if EtOH can be used as a clean, alternative fuel, i.e., one that does not emit sulfur oxides, fine particulates and nitrogen oxides, and if the combustion flue gas can be used for directly heating the interior of greenhouses. The results of $H_2-N_2O$ titration on the supported Pt catalysts with no calcination indicate a metal dispersion of $0.97{\pm}0.1$, corresponding to ca. 1.2 nm, while the calcination of 0.65% $Pt/SiO_2$ at 600 and $900^{\circ}C$ gives the respective sizes of 13.7 and 24.6 nm when using X-ray diffraction technique, as expected. A comparison of EtOH combustion using $Pt/TiO_2$ and $Pt/SiO_2$ catalysts with the same metal content, dispersion and nanoparticle size discloses that the former is better at all temperatures up to $200^{\circ}C$, suggesting that some acid sites can play a role for the combustion. There is a noticeable difference in the combustion characteristics of EtOH at $80{\sim}200^{\circ}C$ between samples of 0.65% $Pt/SiO_2$ consisting of different metal particle sizes; the catalyst with larger platinum nanoparticles shows higher intrinsic activity. Besides the formation of $CO_2$, low-temperature combustion of EtOH can lead to many other pathways that generate undesired byproducts, such as formaldehyde, acetaldehyde, acetic acid, diethyl ether, and ethylene, depending strongly on the catalyst and reaction conditions. A 0.65% $Pt/SiO_2$ catalyst with a Pt crystallite size of 24.6 nm shows stable performances in EtOH combustion at $120^{\circ}C$ even for 12 h, regardless of the space velocity allowed.

• 한국식품과학회지
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• 제41권3호
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• pp.345-349
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• 2009

더덕의 육질과 껍질의 부위별 세포벽 물질(CWM)로부터 uronic acid, 총 당, 비섬유성 중성당, 페놀성 화합물 함량 및 항산화 활성을 측정하였다. 더덕의 육질과 껍질의 uronic acid와 중성당의 비는 4, 6이었다. 총 당 함량은 육질과 껍질에서 각각 788.6, 824.9 ${mu}g/g$ CWM이었다. 주요 비섬유성 중성당은 galactose와 arabinose였다. 더덕 CWM으로부터 분석된 주요 페놀성 화합물은 vanillic acid, p-OH-benzaldehyde, vanillin, ferulic acid 및 8-O-4' diferulic acid 였다. 이들 중 p-OH-benzaldehyde, vanillin, 8-O-4' diferulic acid는 더덕에서 처음으로 동정된 것으로 인삼의 세포벽 페놀성 화합물 조성과 유사하였다. 더덕의 껍질 AIR에 함유된 8-O-4' diferulic acid의 함량은 56.1 ${mu}g/g$ CWM이었다. 더덕의 CWM로부터 얻은 ethanol 분획, ethanol 분획의 ethanol-NaOH 분획, ethanol 분획 후 잔사로부터 얻은 AIR 분획의 항산화 활성의 크기는 ethanol-NaOH 분획이 가장 높았으며, 다음으로 AIR 분획, ethanol 분획의 순으로 나타났다.

• 대한임상검사과학회지
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• 제49권4호
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• pp.337-344
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• 2017

To date, no clear threshold that has been established for defining an adequate store of vitamin D for bone health. Therefore, this study aims to determine the required level of vitamin D to maintain a healthy skeleton based on bone remodelling process among healthy adult population. This was a cross sectional study, involving a healthy adult population in Kota Bharu, Malaysia, aged 18~50 years. We measured serum 25(OH)D (vitamin D), serum parathyroid hormone (PTH), serum C-terminal telopeptide of type 1 collagen (CTX), and Procollagen 1 Intact N-Terminal (P1NP) in 120 healthy adults selected via multi stage sampling (64 males, 56 females) from 6 subdistricts in Kota Bharu. The mean level of 25(OH)D was 23.50 (${\pm}8.74$) nmol/L. There was a significant difference of the vitamin D level between genders ($26.81{\pm}8.3nmol/L$ vs $19.72{\pm}7.68nmol/L$ in males and females respectively) (p value<0.001). More than 50% of female subjects had 25(OH)D less than 20 nmol/L, while only 20.3% of male subjects had 25(OH)D below 20 nmol/L. Based on the LOESS plot, the bone turnover markers showed a plateauing result, at the 25(OH)D level of 35 nmol/L for CTX and 20 nmol/L for P1NP. Contrastingly, PTH showed a step rise in the 25(OH)D level of 20 nmol/L. Based on the LOESS plot for CTX, P1NP and PTH versus 25(OH)D, level of vitamin D between 20 to 35 nmol/L is recommended to maintain healthy skeleton.

• Applied Biological Chemistry
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• 제42권2호
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• pp.170-175
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• 1999

국내 식물자원으로부터 천연 항산화물질을 탐색하기 위하여 항산화활성이 기대되는 38종의 식물을 MeOH 수용액으로 추출한 후, EtOAc와 물로 분배, 추출하였다. 각 추출물에 대하여 DPPH radical 소거활성을 검정하였고, 이중에 작약을 포함한 13종의 식물에서 활성이 확인되었다. 작약뿌리로부터 항산화물질을 분리하기 위하여 80% MeOH 수용액으로 추출, 농축하였고, 이를 EtOAc, n-BuOH 및 물로 계통분획하였다. 활성이 확인된 n-BuOH과 EtOAc층에 대하여 활성을 추적해가며 column chromatography를 반복하여 3종의 활성물질을 분리하였다. 이들의 화학구조를 NMR 등의 spectral data를 해석하여 (+)-catechin, $1,2,3,4-tetragalloyl-6-digalloyl-{\beta}-D-glucose$ 및 $1,2,3,4,6-pentagalloyl-{\beta}-D-glucose$로 동정하였다.

• 한국표면공학회지
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• 제4권1호
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• pp.5-15
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• 1971

"Rapid Determination of Boric Acid in Nickel Plating Solution" by the addition of Na$_2$C$_2$O$_4$ and thus preventing the precipitation of i(OH)$_2$ during titiration , has previously been reported. In this paper, the exact amount of glycerine and the complexing possibility of oxalate with nickel has been determined by measn of conductivity titrations. This experimental work has been supported by the mathematical application of the Debye-Huckel and mass action equitions as well as statistical analysis. The results were ; (1) Fro determining boric acid in nickel plating solution, 20 ml of 400ml/ι glycerine was sufficient, since 97% of the H$_3$BO$_3$ was dissoicated by this addition. (2) In the absence of Na$_2$C$_2$O$_4$ the continious precipitation of Ni(OH)$_2$ during titration with NaOH even past end -point for boric acid determination resulted in considerable anlaytical error. (3) In the presence of Na$_2$C$_2$O$_4$ during titration , Ni++ combined with C$_2$O$_4$-to form NiC$_2$O$_4$. The solution with this precititate of very fine, colloidal , trantsparent particles, remained quite clear for approximately 2 hours. Therefore it was shown that the presence of Na$_2$C$_2$O$_4$ prevents the formation of gross Ni(OH)$_2$ precititation by forming NiC$_2$O$_4$ instead of a complex salt with Ni++ , which did not interfere with the visible determination of the end point for boric acid with NaOH titation. This observous may be interpreted in the light of the previously published solubility ratio for NiC$_2$O$_4$ and Ni(OH)$_2$, 0.3mg/100g H$_2$O(25$^{\circ}C$), respectively. Precipitation of the less soluble , albeit transparent salt, NiC$_2$O$_4$ precluded therefore the precipitation of the Ni(OH)$_2$ salt.

• 한국대기환경학회지
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• 제22권6호
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• pp.779-790
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• 2006

This study examines relative contributions of volatile organic compounds (VOCs) to the formation of hydroxyl (OH) and peroxy radicals such as $HO_2$ and $RO_2$ during the intensive sampling period (Jun. $1{\sim}30$, 2004) in the air of Seoul metropolitan area. As to the contribution of VOCs to $HO_x$ levels, the impact of individual VOC concentration change on $HO_2$ concentration change was more than an order of magnitude higher than that on OH concentration change during the study period. The contribution of change in isoprene concentration to $HO_2$ concentration change was 38 times higher than OH and that in the concentration of alkene compounds to $HO_2$ concentration change was 31 times higher than OH. Moreover, the concentration changes of isoprene and aromatic compounds (AROM) played significant roles in $HO_x$ concentration changes. On the other hands, aldehydes (ALD2) and alkanes (ALKA) showed anti-correlation (negative) in $HO_x$ concentration changes with low contribution ($-4{\times}10^{-3}$ pptv/ppbv (OH) and $-58{\times}10^{-3}$ ($HO_2$) for ALD2; $-1{\times}10^{-3}$ (OH) and $-15{\times}10^{-3}$ ($HO_2$) for ALKA). Unlike other VOCs, $C_2H_6$ and $C_3H_8$ showed positive or negative contribution to peroxy radicals, depending on ambient air conditions. The contribution of VOC concentration changes to changes in $CH_3O_2$ and $RO_2$ concentration showed similar pattern to $HO_x$ contribution.

• 공업화학
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• 제27권5호
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• pp.512-515
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• 2016

새로운 viologen 유도체인 1,1'-bis(3,4-dihydroxybutyl)-[4,4'-bipyridine]-1,1'-diium bromide (V-Pr-2OH)을 합성하여 PTB7 : $PC_{71}BM$ Blend를 기반으로 하는 inverted polymer solar cells (iPSCs)에 cathode buffer layer로 적용하였다. V-Pr-2OH이 cathode buffer layer로 적용된 PSCs (ITO/V-Pr-2OH/PTB7 : $PC_{71}BM/MoO_3/Ag$)의 power conversion efficiency (PCE)는 7.28%이었다. V-Pr-2OH이 없는 iPSCs (ITO/ZnO/PTB7 : $PC_{71}BM/MoO_3/Ag$)의 PCE (7.41%)에 상응하는 값이다. 그러므로 본 연구에서는 높은 열처리 공정이 필요한 ZnO가 배제된, 즉 높은 온도의 열처리 없이도 제작 가능한 PSC에 대한 가능성을 보여주고 있다.

• 대한본초학회지
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• 제26권3호
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• pp.75-82
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• 2011

Objectives : In this study, we evaluated the effect of Chungganhaeju-hwan(CGHJH) on hydrogen peroxide($H_2O_2$)-induced and ethanol(EtOH)-induced neuronal damage in vitro and in vivo, respectively. Methods:We carried out the anti-oxidant effects of CGHJH against hydrogen peroxide($H_2O_2$)-induced toxicity in HT22 and PC12 cells using thiazolyl blue tetrazolium bromide. Then, to investigate the protective effect on CGHJH against EtOH-induced memory impairment and hippocampal cell damage in male ICR mice, we performed novel object recognition test(NORT), and analysed the brain tissues after immunohistochemistry and western blotting. Results:CGHJH showed protective effect from $H_2O_2$-induced cell toxicity at doses of $1\sim100{\mu}g$/mL in both HT22 and PC12 cells. CGHJH had also recovery effect from EtOH-induced memory impairment in ICR mice from NORT and it protected hippocampal cells against EtOH toxicity in the result of cresyl violet and NeuN immunoreactivity. Conclusion : These results demonstrate that CGHJH has protective effect in neuronal cells against $H_2O_2$ and EtOH toxicities and this effect could be a main role of recovery effect on EtOH-induced memory loss.

• 한국재료학회지
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• 제20권2호
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• pp.97-103
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• 2010

In this study, a new, relatively simple fabrication method for forming a mesoporous $Al(OH)_3$ film on Al substrates was demonstrated. This method, i.e., alkali surface modification, was simply comprised of dipping the substrate in a $5\times10^{-3}$ M NaOH solution at $80^{\circ}C$ for one minute and then immersing it in boiling water for 30 minutes. After alkali surface modification, a mesoporous $Al(OH)_3$ film was formed on the Al substrate, and its chemical state and crystal structure were confirmed by XPS and TEM. According to the results of the XPS analysis, the flake-like morphology after the alkali surface modification was mainly composed of $Al(OH)_3$, with a small amount of $Al_2O_3$. The mesoporous $Al(OH)_3$ layer was composed of three regions: an amorphousrich region, a region of mixed amorphous and crystal domains, and a crystalline-rich region near the $Al(OH)_3$ layer surface. It was confirmed that the stabilization process in the alkali surface modification strongly influenced the crystallization of the mesoporous $Al(OH)_3$ layer.