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Kang, Ji Min,Murnandari, Arti,Youn, Min Hye,Lee, Wonhee,Park, Ki Tae,Kim, Young Eun,Kim, Hak Joo,Kang, Seong-Pil,Lee, Jung-Hyun,Jeong, Soon Kwan Elsevier 2018 Chemical engineering journal Vol.335 No.-
<P><B>Abstract</B></P> <P>To avoid the main disadvantage of the carbon dioxide (CO<SUB>2</SUB>) capture process, namely the large amount of energy consumed to regenerate the amine absorbent using current thermal methods, chemical regeneration has been introduced as a novel method to regenerate the amine. Chemical regeneration deploys a swing in the pH of the amine absorbent rather than the swing in temperature of typical thermal regeneration procedures, and hence reduces the regeneration energy. Here we tested calcium chloride (CaCl<SUB>2</SUB>) and calcium hydroxide (Ca(OH)<SUB>2</SUB>) as a calcium source for CO<SUB>2</SUB> desorption and a pH swing agent for amine regeneration. After desorbing from the amine, CO<SUB>2</SUB> in our procedures reacted with Ca<SUP>2+</SUP> to form calcium carbonate (CaCO<SUB>3</SUB>). Forming precipitated CaCO<SUB>3</SUB> is a permanent way to sequester CO<SUB>2</SUB>. Since carbonates have a low energy level compared to CO<SUB>2</SUB>, we expect the developed method to be an economical and energy-efficient process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel process which is chemical regeneration through a pH swing is proposed. </LI> <LI> The chemical regeneration shows higher efficiency of CO<SUB>2</SUB> desorption than the thermal regeneration at even room temperature. </LI> <LI> After the chemical regeneration, a value-added CaCO<SUB>3</SUB> is produced. </LI> <LI> Ca(OH)<SUB>2</SUB> in the presence of Cl<SUP>−</SUP> plays a key role in desorbing CO<SUB>2</SUB> from amine and converting it into CaCO<SUB>3</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Expression of eIF(iso)4E having mutations in cap binding pocket give broad TuMV resistance
Jinhee Kim,Wonhee Kang,Hee-Bum Yang,Dosun Kim,Byoung-Cheorl Kang 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
eIF4E family is well known for recessive resistance gene of potyvirus in many crops. And Turnip mosaic virus (TuMV) is one of the major viruses in Brassicaceae crops which belong to the genus Potyvirus. To elucidate the key amino acids in the interaction between TuMV VPg and Brassica eIF(iso)4E, amino acids of eIF(iso)4E were mutated. Seven amino acids in cap binding pocket were chose for the candidate amino acid that may play a role in the interaction of TuMV VPg. We demonstrated that a single amino acid mutation in cap binding pocket of Brassica eIF(iso)4E can abolish the interaction with TuMV VPg. eIF(iso)4E which has a mutation at each W49, W95 and K150 positions impaired in its interaction with VPg prominently according to the yeast two hybrid analysis. Complementation of an eIF4E knockout yeast strain by mutated eIF(iso)4E proteins showed that all eIF(iso)4E mutants were able to complement eIF4E of yeast. To find out if these mutations affect the susceptibility of Chinese cabbage, transformant analysis was performed. eIF(iso)4E W95L, W95L/K150E and susceptible wild type were over-expressed in susceptible Chinese cabbage. According to the TuMV screening result of T1 and T2 transformants, over-expression of the eIF(iso)4E mutants showed resistance to four TuMV strains (CHN2, 3, 4 and 5). Our results support that the mutations in eIF(iso)4E may control the broad spectrum TuMV resistance.
HCFC-22, HCFC-142b, N₂를 포함하는 혼합가스의 가스하이드레이트 상평형
이원희(Wonhee Lee),강성필(Seongpil Kang) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
수소염화불화탄소(hydrochlorofluorocarbons, HCFC)는 대표적인 지구 온난화 유발의 온실가스이다. 이를 회수, 처리하기 위한 다양한 방법이 이미 존재하고 있으나 본 연구에서는 대체방안으로 하이드레이트 기반 가스분리(hydrate-based gas separation, HBGS)법을 제안하고자 한다. HCFC-22, HCFC-142b, N<sub>2</sub>로 구성되는 두 종류의 혼합 가스에 대하여 가스하이드레이트 상평형 조건을 측정하였다(8.01:12.01:79.98 / 20.01:30.00:49.99). 이들 측정된 상평형 조건은 HBGS법의 운전 조건 결정에 필수적인 데이터이다. 측정된 평형 조건을 기반으로 Clausius-Clapeyron식을 적용한 하이드레이트 해리 엔탈피를 계산할 수 있었고, X-ray diffraction을 이용한 생성 하이드레이트의 결정 구조를 분석하였다. 또한 하이드레이트 생성 속도 측정에 대한 실험을 수행하였고, 이때 발생하는 가스 조성의 변화를 측정하였다. 결과적으로는 하이드레이트 결정의 성장보다는 결정핵 생성이 매우 중요한 운전 인자가 되며, 시스템의 압력에 크게 영향을 받는다는 사실을 알 수 있었다.
공중보건증진, 개인의 선택권, 환경보호 가치의 충돌로 인한 정책옹호연합의 형성과 변화
임원희,김희정,강민아 이화여자대학교 생명의료법연구소 2013 생명윤리정책연구 Vol.7 No.2
In this paper, we applied the advocacy coalition framework (ACF) to analyze the policy changes surrounding the fluoridation program in Korea. While fluoridation programs were actively pursed by the Ministry of Health and Welfare in Korea to promote preventive public health efforts, opponents raised questions on the safety of the fluoride and argued that implementation of the program violates individuals’ right to refuse fluoride treatment. Opponents, especially environmentalists, also raised issues with potential harms to environment. As commonly found in the ACF analysis, a diverse array of coalitions were formed, taking positions on the fluoridation program, based on their core values surrounding the issue, such as public responsibility to protect health and prevent diseases of vulnerable groups versus protection of individual rights and environment from potential harms. To note, we were able to find coalitions’ persistent and active efforts to influence decision-making process with new knowledge and information regarding the effectiveness, safety, and efficiencies of the fluoridation program. The prominent role of knowledge transfer and validation should be evaluated further in future research to understand the impact of such strategies.