• 통합자연과학논문집
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• 제11권2호
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• pp.93-100
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• 2018

Caspases, a family of cysteinyl aspartate-specific proteases plays a central role in the regulation and the execution of apoptotic cell death. Caspase-3 has been proven to be an effective target for reducing the amount of cellular and tissue damage because the activation of caspases-3 stimulates a signalling pathway that ultimately leads to the death of the cell. In this study, Hologram based Quantitative Structure Activity Relationship (HQSAR) models was generated on a series of Caspase-3 inhibitors named 3, 4-dihydropyrimidoindolones derivatives. The best HQSAR model was obtained using atoms, bonds, and hydrogen atoms (A/B/H) as fragment distinction parameter using hologram length 61 and 3 components with fragment size of minimum 5 and maximum 8. Significant cross-validated correlation coefficient ($q^2=0.684$) and non cross-validated correlation coefficients ($r^2=0.754$) were obtained. The model was then used to evaluate the eight external test compounds and its $r^2_{pred}$ was found to be 0.559. Contribution map show that presence of pyrrolidine sulfonamide ring and its bulkier substituent's makes big contributions for improving the biological activities of the compounds.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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• pp.239-244
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• 1999

Radial immersion ratio is an important factor to determine the threshold in face milling and should be estimated in process for automatic force regulation. In this paper, presented is a method of on-line estimation of radial immersion ratio using cutting force. When a tooth finishes sweeping, sudden drop of cutting forces occurs. These force drops are equal to the cutting forces that act on a single tooth at the swept angle of cut and can be acquired from cutting force signals in feed and cross-feed directions. The ratio of cutting forces in feed and cross-feed directions acting on the single tooth at the swept angle of cut is a function of the swept angle of cut and the ratio of radial to tangential cutting force. In the research, it is found that the ratio of radial to tangential cutting force is not affected by cutting conditions and axial rake angle. Therefore, the ratio of radial to tangential cutting force determined by just one preliminary experiment can be used regardless of the cutting conditions. Using the measured cutting forces and predetermined ratio, the redial immersion ratio is estimated. various experiments show that the radial immersion ratio can be estimated by the proposed method very well.

• KSBB Journal
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• 제21권1호
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• pp.16-19
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• 2006

최근의 연구에 의하면 열이나, 산화적 스트레스에 대해서 NDPK는 구조적인 변화를 유발하며, 효소 활성과 구조가 oxidant에 의해 변화된다는 보고를 근거로 하여 정상적인 효모균주와 효모의 NDPK 유전자가 파괴된 mutant에서, 산화적 스트레스에 관련된 역할을 규명하고자 2-D 전기영동 방법을 통해서, $H_2O_2$의 처리전과 처리 후에 전사패턴이 변화된 유전자들, 즉, 산화적조절 신호체제에 연관되어졌을 것이라고 생각되어지는 몇 개의 단백질 리스트를 얻었다. 이 결과는 NDPK의 redox state의 조절에 관련된 효소의 성질을 규명함에 있어 유용한 유전자 신호 체제정보를 제공할 것으로 생각되어진다.

• 산업식품공학
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• 제22권4호
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• pp.283-294
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• 2018

Food allergy is a chronic disease that is increasing all over the world, and it can even lead to a loss of life. To prevent any incidents resulting from food allergies, most countries keep strengthening their food allergen labeling requirements domestically and internationally, with a constant monitoring system against undeclared allergens and recall of offending products. In order to avoid economic losses to industry and damages to international relations from undeclared allergens, it is necessary to confirm each country's regulatory policy on food allergen labeling prior to exportation. Another required action is to try for a reduction of the cross-contamination risk of the allergens during manufacturing and storage, which should be verified by using an accurate and reliable analysis of food allergens. This paper is intended to provide an introduction to the regulation of food allergen labeling by country, allergen management methods to avoid cross-contamination, and allergen detection methods using ELISA, PCR, and LC/MS. Changes of allergenicity during thermal or nonthermal processing also will be investigated in our review. This review will be helpful for the food industry to better understand patients suffering from food allergies and to manage food allergens in food manufacturing.

• Journal of Plant Biotechnology
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• 제46권3호
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• pp.137-142
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• 2019

유전자교정작물은 공여 DNA의 사용 여부와 돌연변이의 크기에 따라 SDN-1, SDN-2, SDN-3 작물로 분류한다. 특히 SDN-1과 SDN-2 작물들은 이들을 창출하기 위하여 사용한 운반체 DNA 단편 또는 guide RNA가 잔존 하지 않는 100% transgene-free 작물의 개발이 가능하다. 따라서 이들은 기존의 전통교배육종기술을 이용하거나 자연 상태에서도 창출이 가능한 작물들이다. 그러므로 기존의 GMO 법령에 따라 이들 유전자교정작물을 판별하거나 표시제에 근거한 관리 감독을 수행하기가 어렵다. 이러한 과학적 사실에 근거하여 호주는 SDN-1 작물은 GMO 규제에서 제외하도록 하였다. 또한, 아르헨티나, 브라질, 일본 등은 외래유전자가 최종산물에 잔존 하지 않는 유전자교정작물은 GMO 규제에서 제외하도록 하여 SDN-1은 물론 SDN-2 작물도 GMO에 포함되지 않을 수도 있도록 하였다. 이러한 추세에 따라 우리나라도 외래유전자가 잔존 하지 않는 유전자교정작물은 GMO 규제에서 제외하도록 하여 유전자교정기술을 이용한 다양한 작물 육종 계통 육성이 널리 이용되어 우수 품종 육성에 기여되길 기대한다.

• 생명과학회지
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• 제19권5호
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• pp.587-592
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• 2009

임신초기의 배아는 peri-implantation 단계에서 매우 극적인 형태학적변화가 일어나는데, 이는 임신 인식 인자로 작용하는 배아에서 제공된 signal(s)에 의해서 시작되어지며, 나아가서 모성자궁과 배아의 상호 신호전달이 임신의 시작과 유지에 필수적인 인자로 작용한다. 배아형태의 급격한 리모델링에 관련된 세포학적, 생화학적, 유전학적 연구를 위하여, 또한 자궁과 배아의 상호 신호전달에 관여하는 잠재적 유전자 군을 발굴하기 위하여, peri-implantation 시기의 돼지배아를 이용하여 expresses sequences tag (EST) 분석을 실행하였다. 돼지배아 EST 분석으로 임신초기 특히 전 착상 단계에서 발현되는 유전자들의 카탈로그(Transcriptome)를 작성하였다. 그중에서 6개의 clone을 선택하여 그 발현 양식을 배아 및 자궁 등에서 관찰한 결과, 각각의 유전자들은 조직, 세포 유형 및 임신 시기에 따른 특이적인 발현 현상을 나타내었다. 본 연구결과는, 배아와 자궁 내막에서의 유전자 발현이 임신 시기에 따라서 다이내믹한 상호 조절 작용을 하고 있음을 나타낸다. 이는 전 착상단계의 모성자궁에서 배아와 자궁 내막의 상호 신호전달이 전 착상 단계의 배아의 급격한 형태학적 변화를 가능하게하고 또한 착상에 필요한 적절한 자궁 내부 환경을 제공하고 있음을 보여준다.

• 대한지리학회지
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• 제45권5호
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• pp.628-646
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• 2010

본 연구는 다수의 사람과 상품이 반복적으로 국경을 넘어 왕래하는 한 중 소무역, 일명 보따리 무역을 대상으로, 소무역의 등장 배경 및 성장 과정에서 한 중 여객 항로의 역할을 설명하고, 소무역의 규모와 소무역상의 조직, 그리고 소무역상의 구성 등의 변화를 살펴봄으로써 한 중소무역의 내적 변화과정을 규명하고, 한 중소무역에서 거래 품목의 특성과수출입 과정 및 소무역 결절지의 특성을 고찰함으로써 한 중 소무역의 공간적 특성을 규명하는데 목적이 있다. 본 연구는 위와 같은 연구 목적을 달성하기 위해, 한 중 소무역과 해운사의 관계를 논의했고, 한 중 소무역의 내적 변화를 소무역에 대한 규제 강화를 중심으로 고찰했으며, 한 중 소무역을 설명하기 위해 1980년대 말부터 소무역이 폭발적으로 증가한 구소련 및 중 동부 유럽의 소무역 현상에 관해 논의했다.

• The Korean Journal of Physiology and Pharmacology
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• 제5권6호
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• pp.495-501
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• 2001

We have cloned the mouse neurotensin/neuromedin N (NT/N) gene from the murine mast cell line Cl.MC/C57.1 for the first time. The murine NT/N cDNA clone consisted of 765 nucleotides and coded for 169 peptide residues with an N-terminal signal peptide, and the C-terminal region contained of one copy of neurotensin (NT) and one copy of neuromedin N (NN). Total of four Lys-Arg dibasic motifs were present; one each at the middle of the open reading frame, at the N-terminal of NN, at the C-terminal of NT, and between NN and NT. Amino acid sequence analysis of the mouse NT/N revealed 90% homology to that of the rat NT/N gene. NT/N is expressed in murine mast cell lines (Cl.MC/C57.1 and P815), but not in murine bone marrow-derived mast cells (BMMCs), murine macrophage cell line (RAW 264.7), nor in murine T cell line (EL-4). NT/N mRNA in C1.MC/C57.1 is highly inducible by IgE cross-linking, phorbol myristate acetate, neurotensin, and substance P. Following the treatment of demethylating agent, 5-azacytidine (5-azaC), the NT/N gene was induced in BMMCs in response to IgE cross-linking. 5-azaC-treated BMMCs did not express the NT/N gene without additional stimuli. These findings suggested that the regulation of NT/N gene expression was dependent on the effects of not only gene methylation but also enhancer and/or repressor proteins acting on the NT/N promoter.

• Journal of Radiation Protection and Research
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• 제41권3호
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• pp.286-290
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• 2016

Background: Activation of air and water in the electron linear accelerator for medical use has not been considered severely. By the new Japanese regulation for protection of radiation hazard, it became indispensable to evaluate of activation of air and water in the accelerator room. The measurement of induced activity in air and water components in the electron energy region of 10 to 20 MeV is very difficult, because this energy region is close to the threshold energy region of photonuclear reactions. Then, we measured the photonuclear reaction yields of $^{13}N$, $^{15}O$, and $^{11}C$ by using the electron linear accelerator. Obtained data were compared with the data calculated by the Monte Carlo method. Materials and Methods: An activation experiment was performed at the Research Center for Electron Photon Science, Tohoku University. Highly purified $SiO_2$, $Si_3N_4$, and carbon disks were irradiated for 10 minutes by bremsstrahlung converted by a tungsten plate. Induced activity from C, N, and O was obtained. Monte Carlo calculation was performed using MCNP5 and AERY (DCHAIN-SP) to simulate the experimental condition. Cross section data were adopted the KAERI dataset. Results and Discussion: In our experiment in hospital, calculated values were not agreed with experimental values. It might be three possible reasons as the cause of this deference, such as irradiation energy, calculation procedure and cross section data. Obtained data of this work, calculated and experimental values were good agreement with each other within one order. In this work, we used KAERI dataset of photonuclear reaction instead of JENDL. Therefore, it was found that the photonuclear cross section data of light elements are most important for yield calculation in these reactions. Conclusion: Further improvement for calculation using a new dataset JENDL/PD-2015 and considering electron energy spreading will be needed.

• 한국유체기계학회 논문집
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• 제16권1호
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• pp.5-10
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• 2013

The performance of screw air compressor is affected by rotor profile, lobe number, air end wrap angle, rotor L/D ratio, suction and discharge ports, revolutions of air end and load regulation control, etc. In general, an efficient screw compressor needs a rotor profile of which has a large flow cross-section area, short sealing lines and a small blow-hole. In this study, experimental study was performed with newly designed $5{\times}6$ rotor profile and various shapes of air end. Results show that the measured specific power consumption of the newly designed screw compressor appeared to be lower than any other published data for the equivalent screw compressors manufactured.