• 통합자연과학논문집
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• 제4권2호
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• pp.91-98
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• 2011

Quantitative structure-activity relationships (QSAR) have been applied for two decades in the development of relationships between physicochemical properties of chemical substances and their biological activities to obtain a reliable statistical model for prediction of the activities of new chemical entities. The fundamental principle underlying the QSAR is that the structural difference is responsible for the variations in biological activities of the compounds. In this work, we developed 3D-QSAR model for a series of 5-Lipoxygenase inhibitors, utilizing comparative molecular field analysis (CoMFA) and Topomer CoMFA methodologies. Our developed models addressed superiority of Topomer CoMFA over CoMFA. The CoMFA model was obtained with $q^2$=0.593, $r^2$=0.939, $Q^2$=0.334 with 6 optimum number of components (ONC). Higher statistical results were obtained with the Topomer CoMFA model ($q^2$=0.819, $r^2$=0.947, ONC=5). Further robustness of developed models was checked with the ANOVA test and it shows F=113 for CoMFA and F=162.4 for Topomer CoMFA model. Contour map analysis indicated that the more requirement of electrostatic parameter for improved potency.

• Journal of the Korean Wood Science and Technology
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• 제36권4호
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• pp.77-83
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• 2008

국내에서 생장한 주요 침엽수 3종(소나무, 잣나무, 리기다소나무)의 수간 내 마이크로피브릴 경사각(microfibril angle, MFA)의 축방향 및 방사방향 변이를 요오드 침적법에 의해 조사하였다. 각 수종의 MFA의 평균값은 소나무 $16.4^{\circ}$, 잣나무 $14.4^{\circ}$, 리기다소나무 $26.2^{\circ}$로 리기다소나무가 가장 크게 나타났다. 공시 수종의 MFA는 약 15~20 연륜까지 감소하다가 그 후 거의 안정된 경향을 보여 주었고 만재부의 MFA는 조재부의 MFA보다 다소 작은 경향이 있었다. 공시재료의 수고에 따른 MFA의 차이는 기부 부분에서 다소 크게 나타났으며 수고가 증가함에 따라 MFA는 감소하는 경향이 있었으나 리기다소나무 조재부는 예외였다. 따라서 MFA는 국내산 주요 침엽수재의 미성숙재와 성숙재를 구분하는 지표의 하나로 이용이 가능할 것으로 생각되었다.

• 환경정책연구
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• 제5권2호
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• pp.1-26
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• 2006

이 글은 물질흐름분석(MFA)이 지속가능성을 둘러싼 추상적인 개념 대립(약지속가능성과 강지속가능성)을 극복하고 지속가능성의 문제를 구체적인 정책 수준에서 논의할 수 있음을 보인다. 이를 위해 물질흐름분석이란 동일한 논리구조가 현실의 국민경제(EW-MFA)에서부터 산업(PIOT/NAMEA) 그리고 제품(LCI)에 이르기까지 구체적이고 일관성 있게 적용될 수 있음을 보이고, 각 유형의 MFA가 지닌 의의와 정책적 함의를 구명한다.

• 생약학회지
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• 제34권2호통권133호
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• pp.142-144
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• 2003

Acetone extracts of 301 strains of marine-derived fungus were tested for antimicrobial activity against three strains of bacteria. The bacteria consisted of three pathogens, Staphylococcus aureus, methicillin-resistant S. Aureus, and multidrug-resistant S. aureus. The acetone extracts of 10 strains (MFA117, MFA130, MFA134, MFA206, MFA217, MFA268, MFA277, MFA291, MFA292, MFA301) showed strong activity, inhibiting 100% of the bacterial growth. These antimicrobial active strains were cultlued in SWS medium on a 1 L scale and the resulting broth and mycelium were extracted to afford mycelium extract (000M) and broth extract (000B), respectively. Antimicrobial activity for all extracts has been tested as the results, the mycelium extract of one strain (217M) and the broth extracts of 9 strains (117B,130B, 134B, 206B, 268B, 277B, 291B, 292B, 301B) exhibited relatively high levels of activity at minimal inhibitory concentration (MIC) values of $500-125\;{\mu}g/mL$ range. Among them, the extracts, 277B, 291B, 292B and 301B showed the most significant antimicrobial activity with $IC_{50}$ values of $125\;{\mu}g/mL$.

• 한국유기농업학회지
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• 제28권1호
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• pp.1-30
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• 2020

This study argues that expanding the multifunctionality of agriculture (MFA) may mitigate existing agricultural problems. To do that this study redefines the concept and scope of the MFA and presents practical tasks to achieve it. Theorizing the MFA begins with the theory of sustainability and first identifies the link between sustainability and MFA. Later, considering the limitations of the existing sustainability theories, we examined where the false linkages leading to the destruction of environmental and social relations originated, and employed the (Re)productivity [(Re)produktivitat] theory in order to obtain alternatives. Research shows that welfare effects of the MFA on humans and the environment are not less than those derived from the agricultural products supplied to the real market, but the values are not recognized. The absence of proper care and compensation is the basis of agricultural problems in Korea. Therefore, this study acknowledges that the MFA is as much worthy as real agricultural production, and insists that appropriate compensation and care should be given to humans (farmers) and nature (agricultural ecosystem) in order to maintain and expand the MFA. In other words, a virtuous cycle between sustainability and the MFA means that the process spreads sustainable farming methods to expand the MFA, forms social consensus on it, and pays fair remuneration for agriculture from the public sector. Transition to such a virtuous cycle requires re-establishing the definition and scope of the MFA, implementing targeting policy, motivating policy targets, strengthening human capacity, and arranging maturity time.

• 생약학회지
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• 제33권3호통권130호
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• pp.219-223
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• 2002

In order to screen new radical scavenging principle which is expected to be antiaging drug lead, we have isolated 160 strains of the marine-derived fungi and investigated 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity for their acetone extracts. The significant activities (>50% Inhibition) were observed in 8 strains of fungi (MFA006, MFA0l4, MFA040, MFA133, MFA139, MFA143, MFA148, MFA153), and among them, MFA153 (Aspergillus parasiticus) showed the most significant radical scavenging activity. The active components were purified by assay-guided isolation to yield two known benzyl alcohols, l53B3 (1) and l53B4 (2), and their structures were determined by physicochemical evidence. Two compounds (1,2) showed the significant radical scavenging activity with $IC_{50}$ values of 0.6 and $1.4{\mu}M$ against DPPH, respectively.

• 농약과학회지
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• 제12권2호
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• pp.111-117
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• 2008

잿빛곰팡이균(Botrytis cinerea)에 대한 N-phenylbenzenesulfonamides 유도체(1-45)들의 살균활성에 관한 비교 분자장 분석(CoMFA)을 정량적으로 검토하였다. 통계적으로 CoMFA 모델의 예측성과 상관성이 비교분자 유사성 지수분석(CoMSIA) 모델보다 월등히 좋았다. 최적화 된 CoMFA I 모델의 통계값은 예측성이 $r^2_{cv.}(or\;q^2)=0.457$ 그리고 상관성이 $r^2_{ncv.}=0.959$이었고 살균활성은 기질 분자들의 입체장(51.9%)과 정전기장(35.6%)에 의존적이었다. 또한 progressive scrambling 분석으로 얻어진 섭동에 대한 감도($d_q^{2'}/dr^2_{yy'}=0.898$)와 예측성($q^2=0.346$ 및 SDEP=0.614)에 의하여 최적의 CoMFA I 모델은 우연 상관성에 의존적이지 않음을 알았다. 그러므로 CoMFA I 모델의 등고도 분석 결과로부터, N-phenyl 고리상 $R_3$ 및 $R_4$-치환기는 입체적으로 크고 $R_1$-치환기로서 S-phenyl 고리상 para-치환기는 입체적으로 작은 치환체가 살균활성에 기여 할 것으로 기대되었으며 최적화 된 CoMFA I 모델은 잿빛곰팡이균에 대한 살균활성을 예측하는데 유용하게 활용될 수 있을 것이다.

• 약학회지
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• 제46권4호
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• pp.219-225
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• 2002

We have performed a 3D-QSAR/CoMFA analysis of the cytotoxic activities of thirty-five 3-arylisoquinoline derivatives against SK-OV-3 tumor cell line. The results suggested that the electrostatic, steric and hydrophobic factors of 3-arylisoquinolines were strongly correlated with the antitumor activity. Considerable predictive ability (cross-validated r2 as high as 0.841) was obtained through CoMFA.

• 생약학회지
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• 제34권2호통권133호
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• pp.138-141
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• 2003

In order to screen new tyrosinase inhibiting principle which is expected to be a new biofunctional skin whitening cosmetics, we have isolated 600 strains of the marine- derived fungi and investigated tyrosinase inhibiting activity for their acetone extracts. The significant activities (>70% Inhibition) were observed in the extract of 10 strains of fungi (MFA7, MFA27, MFA58, MFA317, MFA318, MFA345, MFA412, MFA552, MFA562, MFA581). These active strains were cultured in SWS medium with 1 L scale and the resulting broth and mycelium were extracted to afford mycelium extract (000M) and broth extract (000B), respectively. Tyrosinase inhibiting activity for all extracts has been tested. As the results, the broth extracts of 4 strains (27B, 58B, 552B and 581B) exhibited relatively high levels of activity of $IC_{50}$ values of $3.0-19.0\;{\mu}g/mL$. The active component of 581B was purified by assay-guided isolation to yield the known kojic acid (1), and its structure was determined by physicochemical evidence. Kojic acid showed the significant tyrosinase inhibitory activity with $IC_{50}$ values of $12.0\;{\mu}M$.

• Applied Biological Chemistry
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• 제48권3호
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• pp.252-257
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• 2005

새로운 2-(4-(6-chloro-2-benzoxazolyloxy)phenoxy)-N-phenylpropionamide 유도체들의 구조 변화에 따른 발아 전, 논피(Echinochloa crus-galli)에 대한 제초활성과의 3D-QSAR 관계를 상이한 정렬방법에 따라 비교 분자장 분석(CoMFA)과 비교분자 유사성 지수분석(CoMSIA) 방법으로 연구하였다. 가장 양호한 3D-QSAR 모델은 atom based fit 정렬과 CoMFA장과 CoMSIA장의 조합 조건에서 유도된 CoMFA 모델(AI-2)과 CoMSIA 모델(AII-4)이었다. CoMFA 및 CoMSIA 등고도로부터 제초활성은 N-phenyl 고리 상 치환기의 구조변화로 개선될 수 있었다.