• 동의생리병리학회지
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• 제19권3호
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• pp.785-791
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• 2005

Corydalis Tuber has traditionally been used for the treatment of water retention in the body. Administration of the aqueous extract of Corydalis Tuber has been known to be effective for the control of pain and treatment of arthritis. It was reported that Corydalis Tuber possesses anti-inflammatory activity and modulates the intestinal immune system. The effect of Corydalis Tuber against LPS-stimulated expressions of COX-2, iNOS, and $IL-1{\beta}$ in cells of the murine RAW 264.7 macrophages was investigated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, reverse transcription-polymerase chain reaction (RT-PCR), $PGE_2$ immunoassay, and NO detection. The aqueous extract of Corydalis Tuber was shown to suppress $PGE_2$ production by inhibition on the LPS-stimulated enhancement of COX-2 enzyme activity, $IL-1{\beta}$, and iNOS expression in the RAW 264.7 macrophages. Present results suggest that Corydalis Tuber exerts anti-inflammatory and analgesic effects probably by suppressing of COX-2, iNOS, and $IL-1{\beta}$ expressions, resulting in inhibition of $PGE_2$ synthesis. Corydalis Tuber has anti-inflammatory and analgesic effects probably by suppressing of COX-2, iNOS, and $IL-1{\beta}$ mRNA expressions, resulting in inhibition of $PGE_2$ and NO synthesis.

• 한국식품위생안전성학회지
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• 제17권4호
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• pp.201-205
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• 2002

대조구, 질산염급원, 아민급원 및 질산염-아민급원 함유식이에 인공타액과 위액을 첨가하여 인공소화시켰을 때 각 식이의 NDMA 함량은 각각 2.5$\pm$0.8$\mu\textrm{g}$/kg, 8.5$\pm$1.2$\mu\textrm{g}$/kg, 6.0$\pm$0.6$\mu\textrm{g}$/kg 및 8.0$\pm$1.5$\mu\textrm{g}$/kg 이었다. 이들 식이에 금귤쥬스 10m1를 첨가하여 인공소화시켰을 때 NDMA생성억제 효과는 아민급원 함유식이에서 69.4$\pm$2.4%로 가장 높은 억제효과를 나타내었다. 금귤쥬스로부터 HPLC를 이용하여 분취한 페놀 화합물의 모든 분획에서 NDMA 생성억제 효과가 나타났으며, 특히 fraction no. 4에서 66.5$\pm$2.0%로 가장 높았다.

• 한국자동차공학회논문집
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• 제19권3호
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• pp.138-145
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• 2011

Diesel particulate filter (DPF) systems are being used to reduce the particulate matter emission of diesel vehicles. The DPF should be regenerated after certain driving hours or distance to eliminate soot in the filter. The most widely used method is active regeneration with oxygen at $550{\sim}650^{\circ}C$. Syngas (synthetic gas) can be used to lower the regeneration temperature of Catalyzed DPF (CDPF). The syngas is formed by fuel reforming process of CPOx (Catalytic Partial Oxidation) at specific engine condition (1500rpm, 2bar) using 1wt.% $Rh/CeO_2-ZrO_2$ catalyst. The oxidation characteristics of PM with syngas supplied to filter were studied using partial flow system that can control temperature and flow rate independently. The filter is coated with washcoat loading of $25g/ft^3$ $Pt/Al_2O_3-CeO_2$, and multi-channel CDPF (MC-CDPF) was used. The filter regeneration experiments were performed to investigate the effect of syngas exothermic reaction on soot oxidation in the filter. For this purpose, before oxidation experiment, PM was collected about 8g/L to the filter at engine condition of 1500rpm, bmep 8bar and flow temperature of $200^{\circ}C$ Various conditions of temperature and concentration of syngas were used for the tests. Regeneration of filter started at 2% $H_2$ and CO concentration respectively and inlet temperature of $260^{\circ}C$. Filter Regeneration occurs more actively as the syngas concentration becomes higher.

• 한국세라믹학회지
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• 제55권4호
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• pp.368-375
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• 2018

This study deals with the color formation of ceramic pigment in the $TiO_2$-SnO-ZnO system. We designed compounds to control the color formation depending on the composition using the Design of Experiment. The color coordinate values of synthesized pigments, $L^*a^*b^*$ were measured and statistically analyzed color for changing elements depending on its composition. The relationship between the major crystalline phases and chromaticity was examined using XRD, and the oxidation states of each element were analyzed by XPS. The synthesized pigments based on the compound design exhibited various color changes ranging from yellow-orange to green-blue and brown. The statistical analysis on the spectrophotometer results shows that $a^*$ and $b^*$ values decreased with $TiO_2$ content, and increased with SnO content. Yellow-orange color was detected with the main peak of SnO, and the green-blue color developed with the main peak of $Zn_2TiO_4$. The $a^*$ and $b^*$ values increased with increased SnO peak intensity, and decreased with increased $Zn_2TiO_4$ peak intensity. The results revealed that pigment color formation was influenced by changes in the main crystalline phases and crystalline intensity. However, XPS analysis of the oxidation states of each element showed little correlation with the pigment chromaticity result.

• 청정기술
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• 제2권1호
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• pp.69-79
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• 1996

석탄가스화기에서 방출되는 황을 제어하는 것은 가스정화시스템에서 연료가스 중의 황화수소를 제거하는 것이다. 이에 본 연구에서는 천연산 망간광석의 황화수소 제거능에 영향을 미치는 탈황제의 입자크기, 황화반응 온도 및 탈황제 특성에 대해서 고찰하였다. 실험결과 황화수소 제거능은 반응온도 $700^{\circ}C$에서 효과적이었으며 입자크기가 작을수록 탈황효율은 증가하였으나 그 차이는 크지 않았다. 온도가 증가할수록 탈황제의 응집으로 인해 입자 내 물질전달저항이 증가하여 반응성이 저하되며 SEM 사진으로 탈황제의 응집을 확인할 수 있었다. 실험으로부터 구한 평형비 ($P_{H_2O}/P_{H_2S}$)는 ${\log}(P_{H_2O}/P_{H_2S})=5653/T-3.7909$였다. 천연산 망간광석의 황화수소 제거능이 기존에 개발되어 있는 탈황제들과 비슷하기 때문에 탈황제로 사용할 수 있음을 알았다.

• 접착 및 계면
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• 제20권4호
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• pp.140-145
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• 2019

환경적 관점에서 고분자필름이나 코팅제 산업계에서 이산화탄소와 휘발성 유기화합물의 저감은 가장 중요한 이슈 중의 하나이다. 광경화 시스템은 용제를 사용치 않아 휘발성 유기화합물의 방출을 최소화 할 수 있고 빠른 경화로 인한 에너지 소모가 적은 잇점이 있다. 또한, 생분해성 고분자는 거대한 폐플라스틱의 발생을 고려하면 환경적으로 경제적으로 많은 관심을 받고 있다. 따라서 본 연구에서는 생분해성 고분자인 폴리락타이드 다이올과 폴리에틸렌 글리콜을 폴리올로하여 광경화형 폴리우레탄 아크릴레이트를 합성하였고 자외선에 의해 말단의 아크릴레이트 그룹의 경화반응을 진행하였다. 경화된 필름의 인장강도, 파단율 및 Tg는 폴리락타이드 다이올의 함량 증가와 더불어 증가하였고 친수특성과 열정안정성은 폴리에틸렌 글리콜 함량과 비례하였다. 따라서 친환경적인 폴리올의 함량 조절로 광경화 폴리우레탄 아크릴레이트의 물성이 조절 가능하였다.

• 농업과학연구
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• 제42권2호
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• pp.99-103
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• 2015

Potato virus T (PVT) is a plant pathogen in the family Betaflexiviridae, group IV single-stranded positive sense RNA viruses. The major host of PVT is potato, and it has been reported in Ullucus tuberosus, Oxalis tuberosa and Tropaeolum tuberosum. This study aimed at developing reverse transcription (RT)-polymerase chain reaction (PCR) and nested PCR techniques for specific detection of PVT. Finally, Two RT-PCR primer sets were developed and verified. The RT-PCR products were amplified to 734 (PVT RT-PCR primer set 6) and 828 bp (PVT RT-PCR primer set 29) long to detect PVT. The nested PCR primer sets [PVT-N70/C20 ($734{\rightarrow}315bp$) and PVT-N75/C30 ($828{\rightarrow}529bp$)] were developed which are high sensitivity and verification for detection of PVT. Furthermore, a modified-positive control plasmid is use to verify contamination of laboratory in PVT detection. This study supported the diagnose PVT in potato or PVT related hosts.

• Clinical and Experimental Reproductive Medicine
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• 제26권3호
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• pp.383-387
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• 1999

Objective: There is increasing evidence for the expression of rat in gene in several extrapituitary sites including testis and ovary. We also have demonstrated that the local LH expression in the rat epididymis and uterus, the major accessory sex organs in male and female reproductive system, respectively. Design: The present study was undertaken to elucidate whether the gene for LH receptor is expressed in rat uterus and whether the expressions of uterine LH and its receptor are differentially regulated during estrous cycle. Presence of the transcripts for rat LH receptor in the rat uterine tissue were confirmed by touchdown reverse transcription-polymerase chain reaction (RT-PCR). Results: In $LH{\beta}$ semi-quantitative RT-PCR, the highest expression level was shown in estrus stage. The level of ill receptor transcripts was also fluctuated during estrous cycle. In ovariectomized rats (OVX + Oil), the expressions of both uterine LH and LH-R were markedly reduced when compared to those from normal rats. Supplement with estradiol $17{\beta}$ to the ovariectomized rats (OVX + $E_2$) restored the expression levels of LH and its receptor to the levels in uteri from normal rats. Conclusion: Our findings indicated that 1) LH and its receptor gene are expressed in the rat uterus from cycling rats, 2) the expression of uterine LH and its receptor is mainly, if not all, under the control of ovarian sex steroid(s). These results suggested that the uterine LH may act as a local regulator with auto and/or paracrine manner, though the posibility that the pituitary LH may act directly on the regulation of uterine functions could not be discarded.

• 보존과학연구
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• 통권20호
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• pp.5-20
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• 1999

We have analyzed the allele and genotype frequencies from 10 fractions of ancient human skeleton in 3 pieces of Jar coffin excavated from Naju Bokamni3rd tumulus by PCR amplification, high resolution polyacrylamide gelelectorphoresis and silver staining. We could isolate human genomic DNA from 3 bone fractions but the rest of them could not be used as materials due to being decayed. We could detect sex determination as male and 3 genotypes of STR system, HUMTHO1, HUMTPOX and HUMC5F1PO from the bone fraction of left side in Jar coffin 3 and see the slightly reaction suggesting the sex as male from the bone fraction of the left side in Jar coffin 2 and female from the right side in Jar coffin 3.We have also analyzed the genotype frequencies of mitochondria from the bone fractions of the left side and the right side in jar coffin 3, respectively. From the result of indetifiying at nucletide position between 16018 and 16378of the base of hyper variable region(HV1) in the control region, We can presume that the both bones have the same maternal inheritance.

• 한국환경과학회지
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• 제23권4호
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• pp.681-695
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• 2014

In a pilot-scale dyeing wastewater treatment using two-type fluidizing media, each thickness of biofilm was 15 and 30 ${\mu}m$, respectively. The numbers of protozoa inhabited in small-size (PEMT A) and big-size (PEMT B) media were $7.5{\times}10^4$ and $1.25{\times}10^5$ cells/ml, respectively, and dominant species were Entosiphon sulcatus var sulcatus in PEMT A and Chlamydomonas reinhardtii in PEMT B, respectively. Flask experiments using the two media revealed that the percentages of color removal were 25.8% in PEMT A and 27.1% in PEMT B after 72-h cultivation, indicating the necessity of bioaugmentation. Experiments for bioaugmentation effect on color removal were carried out in the pilot-scale treatment for 75 d by three-step operation under the control of wastewater loading rate and microbial input rate. Dye degradation occurred mainly in the second reaction tank, and the attachment of augmented dye-degrading microorganisms to media took at least 35 d. Final value of chromaticity in effluent was 227, meeting the required standard. Therefore bioaugmentation onto media was good for color treatment. In summary, thickness of biofilm formed on the media depended upon the size of media, resulting in different ecosystem inside the media. Hence, this affected microbial community and color treatment further. Accordingly, the reduction of operation cost is expected by efficient color-treatment process using bioaugmented media.