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RISS 인기검색어
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- 저자 : 허유진(Eugene Huh) (검색결과 3 건)
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폴리머 바인더의 선처리를 통한 압축형 복합화약으로부터 octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine의 회수 공정 개발
김혜주,김동우,허유진,박세원,이창하,안익성,이근득,Kim, Hyejoo,Kim, DongWoo,Huh, Eugene,Park, Sewon,Lee, Chang-Ha,Ahn, Ik-Sung,Lee, Keun Deuk 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
Extraction and anti-solvent crystallization were proposed to recover octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) from pressed polymer bonded explosives(PBXs). DXC-57 and DXC-59, whose polymeric binders are Estane and HyTemp with dioctyl adipate plasticizer, respectively, were used as pressed PBX models. Estane of DXC-57 was removed by washing with tetrahydrofuran prior to extraction, which enabled the crystallization of HMX at a low degree of supersaturation, sufficient to obtain β-form HMX. Using dimethyl sulfoxide and ethanol as the extraction solvent and the anti-solvent for crystallization, respectively, HyTemp and dioctyl adipate in DXC-59 were separated from HMX. The purity of recovered β-form HMX was higher than 99 %.
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만성 저온 스트레스 동물모델에서의 황련(黃連)의 항염증 효능 연구
최진규 ( Jin Gyu Choi ),허유진 ( Eugene Huh ),이원일 ( Wonil Lee ),김윤경 ( Yun-kyung Kim ),이태희 ( Tae-hee Lee ),오명숙 ( Myung Sook Oh ) 대한본초학회 2018 大韓本草學會誌 Vol.33 No.6
Objectives : The aim of this study was to investigate whether the extract of Coptidis Rhizoma inhibits inflammation in chronic cold stress (CCS)-exposed mice or not. Methods : Coptidis Rhizoma extract (CRE) was made by reflux with distilled water. Male ICR mice (7 weeks old) were divided randomly into 5 groups: (1) control, (2) CCS, (3) CCS+CRE 100 ㎎/㎏, (4) CCS+CRE 300 ㎎/㎏, (5) CCS+CRE 1,000 ㎎/㎏ groups. Mice were orally administered once a day for 14 days starting from 1 day before CCS. Group (2)-(5) were exposed to CCS conditions that maintained at 4℃ for 2 h once a day for 14 days. The levels of serum cortisol and hypothalamic prostaglandin E1 (PGE1) and PGE2 were measured by enzyme-linked immunosorbent assay kit. The expression levels of several pro-inflammatory factors like heat shock protein 70 (HSP70), c-fos, and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-kB) were measured by western blot analysis in mouse hypothalamus. Results : Oral administration of CRE 1,000 ㎎/㎏ significantly suppressed the increase of serum cortisol levels in mice exposed to CCS. CCS-exposed mice had significantly increased the expression of HSP70, c-fos, and NF-kB in hypothalamus, while CRE treatment significantly attenuated the elevation of these pro-inflammatory factors. The ratio of PGE2/PGE1 was also higher in CCS-exposed mice than control group. CRE treatment significantly reduced the increase of PGE2/PGE1 ratio induced by CCS. Conclusion : These findings suggest that Coptidis Rhizoma may work as a potential agent to modulate inflammatory responses under the condition of cold adaptation formed by CCS.
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카복실기가 있는 고분자를 이용한 Calcite 결정의 형태 조절
양태욱(Taewook Yang),김동환(Donghwan Kim),허유진(Eugene Huh),조재영(Jae Young Jho),김일원(Il Won Kim) 한국고분자학회 2016 폴리머 Vol.40 No.5
탄산칼슘 결정의 다형체 중 하나인 calcite는 여러 생체미네랄의 주된 구성성분이며, 생체단백질의 작용으로 복잡한 형상을 지니는 경우가 많다. 이러한 작용을 하는 대표적인 단백질인 Asprich는 카복실기가 풍부하며, Asprich에서 유래한 펩티드와 마그네슘 이온이 공존할 때 calcite 결정 형태에 대한 영향이 큰 것이 알려져 있다. 본 연구에서는 카복실기가 있는 합성 고분자를 이용하여 calcite 결정의 형상을 제어하였다. Poly(acrylic acid)와 poly(methacrylic acid)를 이용하였을 때는 Asprich 펩티드의 calcite 형태 조절 작용을 재현할 수 있었으나, poly(ethylene imine)과 poly(N-isopropylacrylamide)를 첨가하였을 때는 유사한 효과를 관찰할 수 없었다. 이러한 현상은 음이온성 고분자가 calcite의 {hk0} 결정면에 선택적으로 결합하는 경향으로 설명할 수 있다. Calcite is one of the anhydrous polymorphs of calcium carbonate. When it is found in biominerals, they often have complex morphologies controlled by associated proteins. Asprich, rich in carboxylic acid groups, is one of the representative proteins. In previous studies, peptides originated from Asprich showed extensive modification abilities of calcite morphologies, especially in the presence of magnesium ions. In the present study, synthetic polymers with carboxylic acid groups were utilized to regulate the morphologies of calcite. Poly(acrylic acid) and poly(methacrylic acid) were able to reproduce the controlling ability of Asprich peptides, but poly(ethylene imine) and poly(N-isopropylacrylamide) could not. The observed phenomenon can be explained through selective binding of the anionic polymers to the {hk0} planes of calcite.
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