• 한국산림과학회지
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• 제99권1호
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• pp.16-23
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• 2010

본 연구에서는 인간 면역 세포인 B 세포와 T 세포 그리고 그들의 cytokinedml 분비에 대해서 조사하였다. 또한 일일 경구 투여량을 30 mg/mL 그리고 100 mg/mL의 농도로 조절하여 암컷 ICR 마우스에 투여하여 혈청에서의 항체 생성량을 조사하였다. 인간 정상 폐세포에 대한 세포독성 결과 모든 추출물이 24.15% 이하의 독성을 나타내었다. 인간 면역 세포인 B 세포와 T 세포 모두 초고압 추출공정에 의해 40% 이상 생육이 증진하였다. 인간 면역 세포인 B 세포와 T 세포에서 분비되는 cytokine(IL-6, TNF-${\alpha}$)의 양은 일반 열수 추출 공정과 비교하여 약 20-50% 증가하였다. 또한 고로쇠 추출물의 투여로 인해 총 항체 생성량도 증가하였다. 이와 같은 결과에서 고로쇠의 효과적인 최적의 추출 조건은 일반적인 공정 보다 $100^{\circ}C$이하의 온도에서 높은 압력과 함께 용매 추출공정을 이용하는 것이다.

• 대한한의학회지
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• 제30권6호
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• pp.17-26
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• 2009

Objectives: Little information is available regarding the effect of Lycii cortex radicis (LCR) on cell viability in glioma cells. This study was therefore undertaken to examine the effect of LCR on cell survival in U87MG human glioma cells. Methods: Cell viability and cell death were estimated by MTT assay and trypan blue exclusion assay, respectively. Reactive oxygen species (ROS) generation was measured using the fluorescence probe DCFH-DA. Activation of Akt and extracellular signal-regulated kinase (ERK) and activation of caspase-3 were estimated by Western blot analysis. Results: LCR resulted in apoptotic cell death in a dose- and time-dependent manner. LCR increased reactive oxygen species (ROS) generation and LCR-induced cell death was also prevented by antioxidants, suggesting that ROS generation played a critical role in LCR-induced cell death. Western blot analysis showed that LCR treatment caused down-regulation of Akt and ERK. The LCR-induced cell death was increased by the inhibitors of Akt and ERK. Activation of caspase-3 was stimulated by LCR and caspase inhibitors prevented the LCR-induced cell death. Conclusion: These findings suggest that LCR results in human glioma cell death through a mechanism involving ROS generation, down-regulation of Akt and ERK, and caspase activation.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제23권1호
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• pp.15-20
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• 2001

For the earlier diagnosis and treatment of delayed wound healing in extraction socket, we investigated the clinical, radiographic and histopathologic features of 106 patients with delayed wound healing diagnosed by biopsy. The patients were enrolled at the Department of Oral Pathology, Chosun University Dental Hospital. Among 106 delayed wound healing diagnosed by biopsy, cysts showed most significant 25 cases (23%), osteomyelitis showed 13 cases (12%), chronic maxillary sinusitis and squamous cell carcinoma showed 12 (11%) and 11 (10%) cases, respectively. We have analyzed these lesions through relevant literatures.

• 한국약용작물학회지
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• 제12권2호
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• pp.141-148
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• 2004

Two compounds from Gomisin N and Gomisin A were isolated from the fruits of Schizandra chinensis Baillon. The highest extraction yield as 21.36% was observed in the ethanol extract, compared to the yield obtained form the water extract. The extraction yields of the single compounds were measured to be 0.13 and 0.014 Gomisin A and Gomisin N, respectively. Approximately, 90% of the growth of human stomach adenocarcinoma cancer cells was inhibited after adding 1.0 g/l of the ethanol extract. The growth of the human normal lung cell was limited to 24% after adding the ethanol extract. The water extract lowered the specific secretion of $TNF-\acute{a}$ and IL-6 from T cells, $10.3{\times}10^{-4}\;pg/cell\;and\;12.1{\times}10^{-4}\;pg/cell$, respectively, compared to the ethanol extracts. On the other hand, a treatment with the ethanol extract increased the specific secretion of $TNF-\acute{a}$ and IL-6 from human T cells, to $11{\times}10^{-4}\;pg/cell\;and\;14.3{\times}10^{-4}\;pg/cell$, respectively. The crude ethanol extract had the highest effect on the differentiation of human promyelocytic leukemia cells compared to the other extracts and Gomisin A and N. In general, the biological activities of the extracts gradually decreased as the purification process proceeded, which suggests that higher immunostimulatory activities can be maintained by adding the crude extracts of the fruits rather than by adding a single compound.

• 한국컴퓨터정보학회논문지
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• 제12권2호
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• pp.83-91
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• 2007

본 논문에서는 삼차원 볼륨이미지로부터 정육면체형 셀의 분해를 통해 위상학적으로 정확한 삼중선형 등위면을 계산하고 가시화하는 알고리즘을 제시하였다. 등위면은 삼차원 볼륨이미지를 가시화하는데 자주 사용되며, 볼륨데이타의 각 정육면체형 셀안의 등위면을 삼각형의 집합으로 나타냄으로써 컴퓨터에서 가시화하기 쉽게 된다. 그러나, 대부분의 기존 등위면 계산 방식들은 이상적인 형태인 삼중선형 등위면의 위상을 보존하지 못하여 정확성이 떨어지는 단점을 가지고 있다. 본 논문은 삼차원 볼륨이미지를 구성하는 정육면체형 셀에서 일어날 수 있는 모든 등위면 형태에 대하여 정확한 삼중선형 등위면의 위상을 결정하고, 각 경우에 따라 적절한 정육면체 셀의 분해를 실시한 뒤, 분해된 셀들에 대하여 등위면을 나타내는 삼각형들을 추출하여, 위상학적으로 정확한 삼중선형 등위면을 만들어낸다. 마지막으로, 본 논문에서 제안된 알고리즘을 구현한 결과는 정확한 삼중선형을 가시화할 수 있음을 보여준다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제7권3호
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• pp.138-149
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• 2002

Plant cell culture provides a viable alternative over whole plant cultivation for the production of secondary metabolites. In order to successfully cultivate the plant cells at large scale, several engineering parameters such as, cell aggregation, mixing, aeration, and shear sensitivity are taken into account for selection of a suitable bioreactor. The media ingredients, their concentrations and the environmental factors are optimized for maximal synthesis of a desired metabolite. Increased productivity in a bioreactor can be achieved by selection of a proper cultivation strategy (batch, fed-batch, two-stage etc.), feeding of metabolic precursors and extraction of intracellular metabolites. Proper understanding and rigorous analysis of these parameters would pave the way towards the successful commercialization of plant cell bioprocesses.

• 대한임상검사과학회지
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• 제46권3호
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• pp.99-105
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• 2014

Isolating total DNA from small samples using traditional methods is difficult and inefficient mainly due to loss of DNA during filtration and precipitation. With advances in molecular pathology, DNA extraction from micro-dissected cells has become essential in handling clinical samples. Genomic DNA extraction using small numbers of cells can be very important to successfully PCR amplify DNA from small biopsy specimens. We compared our experimental genomic DNA extraction method (A) with two other commercially available methods: using spin columns (B), and conventional resins (C), and determined the efficacy of DNA extraction from small numbers of cells smeared on a glass slide. Approximately 50, 100, 200, 500 and 1000 cells were isolated from fine needle aspiration biopsy (FNAB) slides aspirated from histologically proven papillary thyroid carcinoma masses. DNA was extracted using the three techniques. After measuring DNA quantity, PCR amplification was performed to detect the ${\beta}$-globin and $BRAF^{V600E}$ gene mutations. DNA extracted by method (A) showed better yield than the other methods in all cell groups. With our method, a suitable amount of genomic DNA to produce amplification was extracted from as few as 50 cells, while more than 100 to 200 cells were required when methods (B) or (C) were applied. Our genomic DNA extraction method provides high quality and improved yields for molecular analysis. It will be especially useful for paucicellular clinical samples which molecular pathologists often confront when handling fine needle aspiration cytology, exfoliative cytology and small biopsy specimens.

• 신재생에너지
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• 제19권4호
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• pp.27-34
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• 2023

In this study, microalgal oil was extracted from Nannochloropsis oceanica cultured in an open raceway pond and converted into biodiesel using a solid acid catalyst. Microalgal oil was extracted from two types of microalgae with and without nitrogen starvation using the KOH-solvent extraction method and the fatty acid content and oil extraction yield from each microalgae were compared. The fatty acid content of N. oceanica was 184.8 mg/g cell under basic conditions, and the oil content increased to 340.1 mg/g under nitrogen starvation conditions. Oil extraction yields were 90.8 and 95.4% in the first extraction, and increased to 97.5 and 98.8% after the second extraction. Microalgal oil extracted by KOH-solvent extraction was yellow in color and had reduced viscosity due to chlorophyll removal. In biodiesel conversion using the catalyst SO₄^2-/HZSM-5, solvent-extracted oil showed a FAME content of 4.8%, while KOH-solvent-extracted oil showed a FAME content of 90.4%. Solid acid catalyst application has been made easier by removal of chlorophyll from microalgal oil. The FAME content increased to 96.6% upon distillation, and the oxidation stability increased to 11.07 h with addition of rapeseed biodiesel and 1,000 ppm butylated hydroxyanisole.

• 한국식품영양과학회지
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• 제22권4호
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• pp.500-509
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• 1993

Pectins present in the primary cell walls and middle lamellae of plant cell walls are extracted by water, cheating agents, acid or alkali solutions. However, some neutral contaminating components are extracted in conjunction with pectins during the extraction process. Thus, the accurate characterization of physi-cochemical properties of pectins necessitates to get rid of the impurities. In this review, dialysis, alcohol precipitation, ion exchange chromatography and metal precipitation were compared as procedures to purify the pectin extracts. In addition, the chemical methods to analyze pectins are discussed in terms of three major chemical constituents, i.e., anhydrogalacturonic acid, methoxyl groups and neutral sugars.

• 한국식품과학회지
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• 제42권2호
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• pp.233-239
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• 2010

본 연구에서는 초고압 및 초음파 공정을 병행하여 실시하는 추출공정을 이용하여 매자나무 수피의 면역활성 및 Sarcoma-180에 의해 유발되는 복수암 및 고형암에 대한 항암활성 증진 효과를 평가하였다. 상기 추출 공정을 통해 매자나무 추출물의 수율이 일반 열수 추출에 비해 1.7배 증가하였으며, 정상세포에 대한 생존율을 80%이상 유지하는 것으로 나타나 독성 저감 효과도 갖는 것으로 확인되었다. 특히, 매자나무의 초고압, 초음파 병행 추출물이 소화기계 암세포주인 AGS와 Caco-2에 대해서 약 70%의 암세포 생육 저해활성을 나타내며, 최고 4 이상의 selectivity를 나타내며 선택적인 암세포 사멸 효과를 나타내었다. 기존의 연구에서 항암성 면역증강제로 사용되고 있는 버섯의 단백 다당체와 관련하여 영지버섯이 효과적인 항암 활성을 나타내며, 특히 위암 세포인 AGS에 대해 50 mg/mL의 고농도의 영지버섯 추출물이 76% 이상의 암세포 생육저해 활성을 나타내었다(24). 이러한 연구 결과와 비교할 때 본 연구의 매자나무 추출물이 갖는 소화기계 암세포 생육저해 활성은 매우 높다고 할 수 있다. 또한 항암성 면역 활성 측정 결과 초고압, 초음파 병행 추출물이 일반 열수 추출 공정이나 초음파, 초고압 단독 추출 공정을 통한 추출물에 비해 nitric oxide 및 IgG의 생성을 증가시키는 것을 확인할 수 있었다. 초고압 및 초음파 추출 공정이 약용작물의 활성성분 용출에 기여하며, 특히 저온 초고압 추출 공정이 매자나무의 주요 활성성분인 berberine의 용출을 증가시킨다는 연구 결과(25,26)에 미루어 볼 때 초고압, 초음파 병행 추출 공정이 매자나무 활성 성분 용출에 효과적인 영향을 미치는 것으로 사료된다. In vivo 실험을 통한 추출 공정별 매자나무 추출물의 항암 활성 평가를 통해서 상기 공정을 통한 매자나무 추출물이 40% 이상의 복수암 유발 마우스의 수명율 연장과 약 75%의 고형암 억제 활성을 나타내며 효과적인 항암활성을 확인할 수 있어, 향후 항암성 면역증강제 및 기능성 항암제로서의 기능성 소재화로서의 활용성이 매우 높을 것으로 사료된다.