• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2006년도 International Meeting of the Microbiological Society of Korea
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• pp.17-19
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• 2006

• 한국토양환경학회지
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• 제4권1호
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• pp.97-108
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• 1999

금속 철(Fe$^{0}$ )에 의한 TNT의 환원실험을 회분식 반응조를 사용하여 환원 상태에서 연구하였다. 실험 결과, 환원에 의한 TNT의 농도감소는 유사 1차 반응으로 나타났고 반응상수는 반응조에 첨가한 철의 표면적에 선형적으로 비례하였으며, 교반 속도 60 rpm에서의 반응상수는 0.0981$min^{-1}$m$^{-2}$ L로 측정되었다. Triaminotoluene로 추정되는 최종산물이 용액내에 축적되었다. 철 표면에 흡착된 물질을 용출하기 위하여 acetonitrile혹은 물(인산염 완충액, pH=7.0)로 추출을 시도하였으나 용출되는 물질은 극히 미량이었다. 또한, 용액 내에서 생물학적 분해에서의 주요 중간산물인 aminodinitrotoluenes은 검출되지 않았다. 그러므로, 철에 의한 TNT의 환원시 니트로기의 환원이 순차적으로 발생하여 아미노기를 형성하지 않고, 3개의 니트로기에 대하여 동시에 발생하는 것으로 사료된다. 이에 TNT의 환원 모델을 제시하였다.

• Current Optics and Photonics
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• 제1권3호
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• pp.233-238
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• 2017

In this paper we propose a freeform secondary lens for an LED fishing/working lamp (LFWL). This innovative LED lamp is used to replace the traditional HID fishing lamp, to satisfy the lighting demands of fishing and the on-board activities on fishing boats. To realize the freeform lens's geometry, Gaussian decomposition is involved in our optics-design process for approaching the targeted light intensity distribution curve (LIDC) of the LFWL lens. The simulated results show that the illumination on the deck, on the sea's surface, and underwater shows only small differences between LED fishing/working lamps and HID fishing lamps. Meanwhile, a lighting efficiency of 91% with just one third of the power consumption can be achieved, when the proposed LED fishing/working lamps are used instead of HID fishing lamps.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 2005년도 제48회 춘계 학술연구 발표회
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• pp.15-15
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• 2005

• Journal of Microbiology and Biotechnology
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• 제18권9호
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• pp.1613-1619
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• 2008

It has been reported that Tat-SOD can be directly transduced into mammalian cells and skin and acts as a potential therapeutic protein in various diseases. To isolate the compound that can enhance the transduction efficiency of Tat-SOD, we screened a number of natural products. 3-O-[$\beta$-D-Glucopyranosyl(1$\rightarrow$4)-$\alpha$-L-arabinopyranosyll-hederagenin (OGAH) was identified as an active component of Fatsia japonica and is known as triterpenoid glycosides (hederagenin saponins). OGAH enhanced the transduction efficiencies of Tat-SOD into HeLa cells and mice skin. The enzymatic activities in the presence of OGAH were markedly increased in vitro and in vivo when compared with the controls. Although the mechanism is not fully understood, we suggest that OGAH, the active component of Fatsia japonica, might change the conformation of the membrane structure and it may be useful as an ingredient in anti-aging cosmetics or as a stimulator of therapeutic proteins that can be used in various disorders related to reactive oxygen species (ROS).

• Asian Pacific Journal of Cancer Prevention
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• 제14권12호
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• pp.7339-7344
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• 2013

To analyze the effects of a new unknown peptide DEF on the growth of tumor cells, a fused polypeptide TAT-DV1-DEF was designed and synthesized. The lung adenocarcinoma cell line GLC-82 treated with TAT-DV1-DEF was analyzed with a cell counting kit 8, and the location of polypeptides in cells was observed under laser confocal microscopy. The efficiency of polypeptide transfection and changes in nuclear morphology were analyzed by flow cytometry and fluorescence microscopy, respectively. Finally, the mechanism of tumor cell growth inhibition was evaluated by Western blotting. We found that TAT-DV1-DEF could significantly inhibit the growth of the lung adenocarcinoma cell line GLC-82, but not the normal human embryonic kidney cell line HEK-293. Polypeptides were found to be mostly localized in the cytoplasm and some mitochondria. The efficiency of polypeptide transfection in the two cell types was approximately 99%. Apoptotic nuclei were observed under fluorescence microscopy upon treatment with polypeptides and DAPI staining. Western blot analyses indicated that the polypeptide inhibition of tumor cell growth was apoptosis dependent. In the present study, we demonstrated that fused polypeptides could induce apoptosis of the lung adenocarcinoma cell line GLC-82, indicating that the new unknown peptide DEF has antitumor effects.

• 한국동물위생학회지
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• 제31권4호
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• pp.493-496
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• 2008

Brucella spp. are small, non-motile Gram-negative coccobacilli known to cause disease in a number of vertebrate species including humans and brucellosis is one of the world's major zoonoses, alongside bovine tuberculosis and rabies. There are about 33.55 million goats and 1.16 million sheep in Bangladesh. The sheep and goats can significantly play an important role in the economic well being of the resource-poor farmer in Bangladesh. Sexually matured 362 female small ruminants(300 goats and 62 sheep) were examined. Approximately 3-5 ml of blood was collected from the jugular vein of each animal and sera samples were prepared. Samples were then tested for brucellosis by using Rose Bengal test(RBT), plate agglutination test(PAT) and tube agglutination test(TAT). Among 362 small ruminants, irrespective of species(sheep or goat), diagnosed highest in TAT, 2.21%(n=8) and lowest both by RBT & PAT, 1.93%(n=7) and it is concluded that TAT is superior than RBT and PAT.

• Tuberculosis and Respiratory Diseases
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• 제45권6호
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• pp.1214-1222
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• 1998

연구배경 : Plasminogen activator inhibitor-l(PAI-1) 항원은 섬유소 용해에 관여하는 tissue type plasmingen activator(t-PA)를 억제하여 흉막액에 존재하는 섬유소가 용해되는 것을 억제하며 결국 흉막액의 응고를 촉진하게되며 패혈증 환자의 혈장에서 PAI-1 항원과 관계된 섬유소 용해능의 활성용 업종의 정도와 관계가 알려져 있슴으로 본 연구에서 흉막액내 염증 정도와 흉막액의 섬유소 용해 및 응고농 간의 상관관계를 알아보고자 하였다. 방 법 : 첫 흉막천자 후 얻어지는 검체와 검사 당일 환자의 혈액 3.8% citrate tube에 모은 후 즉시 2,000 rpm에서 30분간 원심 분리하였고 상층액을 분리하여 검사할 때까지 영하 $20^{\circ}C$에 보관하였다. 흉막액내 염증을 나타내는 지표로 흉막액의 포도당, LDH, pH, 총 단백질을, 염증세포의 침윤 정도를 나타내는 지표로 다형핵 백혈구, 림프구 및 총 백혈구를 측정하였고 혈액의 염증을 나타내는 지표로 호중구, 피브리노겐을 측정하였다. 흉막액의 섬유소 용해 및 응고능을 측정하기 위하여 D-dimer, PAI-1 항원, 트롬빈-항트롬빈 III 복합체를 측정하였으며 상관관계를 분석하였다. 결 과 : 대상환자는 30예 이었고 평균 연령은 51.4세 이었다. 흉막액의 원인 질환으로는 결핵성 흉막액 : 14예, 악성 흉막액 : 10예, 부폐렴성 흉막액 : 6예 이었다. D-dimer, PAI-1 항원, 트롬빈-항트롬빈 III 복합체는 흉막액에서 혈장치 보다 의의있게 높았으며 혈장치와 유의한 상관관계는 없었다. 혈장 PAI-1 항원과 트롬빈-항트롬빈 III 복합체는 원인질환 간에 차이를 보이지 않았다. 흉막액의 D-dimer와 트롬빈-항트롬빈 III 복합체는 원인에 따른 차이가 없었으나 흉막액 PAI-1 항원은 결핵성 흉막액에서 악성 및 부폐렴성 흉막액 보다 의의있게 높았다. 흉막액 염증의 경중에 따른 D-dimer(p=0.85), PAI-1 항원 (p=0.35) 및 트롬빈-항트롬빈 III 복합체(p=0.66)의 차이는 없었다. 흉막액 다형핵 백혈구, 림프구 및 총 백혈구수와 흉막액 트롬빈-항트롬빈 III 복합체는 부분적으로 유의한 상관관계를 보였다. 결 론 : 흉막 염증시 PAI-1 항원의 국소적 생성 가능성이 높았으며, 흉막액 염증 정도와 흉막액 D-dimer, PAI-1 항원 및 트롬빈 항트롬빈 III 복합체의 농도는 차이를 보이지 않았으며 흉막 염증시 흉막내로 유입된 염증 세포는 PAI-1 항원과는 무관하게 섬유소 용해 및 응고 과정에 관여한다고 생각된다. 흉막액 D-dimer와 흉막액 PAI-1 항원은 유의한 상관관계를 보이지 않아 이는 PAI-1 항원 이외의 다른 요인이 섬유소 용해 및 응고에 관여하고 있음을 암시하여주는 소견으로 생각된다.

• Toxicological Research
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• 제3권2호
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• pp.73-80
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• 1987

Primary cultures of adult rat hepatocytes were used to study the cytotoxicity of D-galactosamine. Hepatocytes were isolated by a collagenase perfusion technique and maintained as monolayers in serum-free medium on collagen-coated culture dishes. Treatment of galactosamine to the culture markedly inhibited the uptake of ${\alpha}$-aminoisobutyric acid (AIB) inducible with glucagon and dexamethasone. At0.1 mM of galactosamine, AIB uptake was inhibited significantly when treated for 12 hr. At higher doses (0.25, 0.5 and 1.0mM), a significant inhibition was noticed after 1 hr exposure. Generally the magnitude of the inhibition was related to the dose and treatment time of galactosamine. Treatment of galactosamine also produced a dose- and treatment time-related suppression of the tyrosine aminotransferase (TAT) induction caused by dexamethasone. Meanwhile, uptake of ouabain was not affected by the treatment of galactosamine. The viability of the hepatocytes was decreased only slightly by the treatment of galactosamine; more than 87% of the cells excluded tryphane blue when treated 1 mM galactosamine for 12 hr. Galactosamine induced depressions of AIB uptake and TAT activity were prevented by the simultaneous addition of uridine to the culture. D-Galactosamine, cytotoxicity, hepatocytes culture, ${\alpha}$-aminoisobutyric acid uptake, tyrosine aminotransferase.

• 분석과학
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• 제36권5호
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• pp.205-215
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• 2023

In the present study, an analytical method was proposed for detecting trifluralin in aquatic products at trace concentrations. The method employed QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) and gas chromatography coupled with tandem mass spectrometry (GC-MS/MS) as the sample preparation and measurement, respectively. The effect of the aqueous phase volume used in the QuEChERS was demonstrated, and the ratio of 10:10 (mL) between water and acetonitrile phase was used for 5 g of sample. Besides, dSPE using C18 and primary-secondary amine (PSA) was applied to remove the potential interferences from the food matrices, indicating no remarkable analyte loss. The linear range was built up from 0.50 ㎍ L^-1 to 3.0 ㎍ L^-1 (R² = 0.9993). Other criteria, i.e., repeatability (RSD_r = 0.86-1.96 %), reproducibility (RSD_R = 1.09-2.01 %), and recovery (over 90 %), were in accordance with Appendix F of AOAC (2016) for method performance. Although no trifluralin was detected for the commercial samples (fish, shrimp, and breaded shrimp), the spiked samples performed favorable recoveries and precision.