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CO<sub>2</sub> capture from humid flue gases and humid atmosphere using a microporous coppersilicate
Datta, Shuvo Jit,Khumnoon, Chutharat,Lee, Zhen Hao,Moon, Won Kyung,Docao, Son,Nguyen, Thanh Huu,Hwang, In Chul,Moon, Dohyun,Oleynikov, Peter,Terasaki, Osamu,Yoon, Kyung Byung American Association for the Advancement of Scienc 2015 Science Vol.350 No.6258
<P><B>Grabbing CO<SUB>2</SUB> from wet gas streams</B></P><P>It is a challenge to extract CO<SUB>2</SUB> from typical gas streams, such as the flue gas from a power plant. This is because any water in the stream tends to prevent CO<SUB>2</SUB> absorption and may also degrade the absorbing material. Datte <I>et al.</I> developed a microporous copper silicate that avoids these problems. Most other materials have sites that absorb both water and CO<SUB>2</SUB> at the same sites, and in that fight, the water tends to win. Although their material still absorbs water, it has separate sites for the CO<SUB>2</SUB> absorption. It also shows good stability despite the absorbed water and can be reused.</P><P><I>Science</I>, this issue p. 302</P><P>Capturing CO<SUB>2</SUB> from humid flue gases and atmosphere with porous materials remains costly because prior dehydration of the gases is required. A large number of microporous materials with physical adsorption capacity have been developed as CO<SUB>2</SUB>-capturing materials. However, most of them suffer from CO<SUB>2</SUB> sorption capacity reduction or structure decomposition that is caused by co-adsorbed H<SUB>2</SUB>O when exposed to humid flue gases and atmosphere. We report a highly stable microporous coppersilicate. It has H<SUB>2</SUB>O-specific and CO<SUB>2</SUB>-specific adsorption sites but does not have H<SUB>2</SUB>O/CO<SUB>2</SUB>-sharing sites. Therefore, it readily adsorbs both H<SUB>2</SUB>O and CO<SUB>2</SUB> from the humid flue gases and atmosphere, but the adsorbing H<SUB>2</SUB>O does not interfere with the adsorption of CO<SUB>2</SUB>. It is also highly stable after adsorption of H<SUB>2</SUB>O and CO<SUB>2</SUB> because it was synthesized hydrothermally.</P>
Removal and stabilization of heavy metals using calcium rich-organic wastes
( Peter Win ),( Seong-jik Park ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
Soil contamination is a serious problem with deleterious impact on global sustainability. The objectives of this paper is for removal and stabilization of heavy metals in contaminated soil. During the last few decades, intensive studies of removal and stabilization of heavy metal in soil have been conducted. To avoid the risk of heavy metals exposure, several remediation techniques have been evaluated including soil washing, stabilization/solidification (SS), bioremediation, and electrokinetics. however these techniques are used to reduce heavy metal concentrations with no consideration of their effects. Recently, natural or waste materials have become attractive metal immobilization agents due to their cost-effectiveness. Previous studies found that waste materials can be used as cost-effective soil amendments to immobilize heavy metals in contaminated soils. In this study, naturally occurring waste materials including egg shells, oyster shells, and pig bone are used for removal Cd,Pb and Cu. To do this, an incubation experiment and Five extractants, 0.01 M calcium chloride (CaCl<sub>2</sub>), 1 M CaCl<sub>2</sub>, 0.1 M hydrochloric acid (HCl), 0.43 M acetic acid (CH<sub>3</sub>COOH), and 0.05 M ethylendiaminetetraacetic acid (EDTA), are used to determine the extractability of Cd, Pb and Cu. The study indicates that soil amended with oystershell, eggshell and pig bone improve soil quality and stabilize heavy metal in contaminated soil.
Verwilst, Peter,Kim, Hye-Ri,Seo, Jinho,Sohn, Nak-Won,Cha, Seung-Yun,Kim, Yeongmin,Maeng, Sungho,Shin, Jung-Won,Kwak, Jong Hwan,Kang, Chulhun,Kim, Jong Seung American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.38
<P>The elucidation of the cause of Alzheimer's disease remains one of the greatest questions in neurodegenerative research. The lack of highly reliable low-cost sensors to study the structural changes in key proteins during the progression of the disease is a contributing factor to this lack of insight. In the current work, we describe the rational design and synthesis of two fluorescent BODIPY-based probes, named Tau 1 and Tau 2. The probes were evaluated on the molecular surface formed by a fibril of the PHF6 ((306)-vulyio(311)) tau fragment using molecular docking studies to provide a potential molecular model to rationalize the selectivity of the new probes as compared to a homologous A beta-selective probe. The probes were synthesized in a few steps from commercially available starting products and could thus prove to be highly cost-effective. We demonstrated the excellent photophysical properties of the dyes, such as a large Stokes shift and emission in the near-infrared window of the electromagnetic spectrum. The probes demonstrated a high selectivity for self-assembled microtubule-associated protein tau (Tau protein), in both solution and cell-based experiments. Moreover, the administration to an acute murine model of tauopathy clearly revealed the staining of self-assembled hyperphosphorylated tau protein in pathologically relevant hippocampal brain regions. Tau 1 demonstrated efficient blood brain barrier penetrability and demonstrated a clear selectivity for tau tangles over A beta plaques, as well as the capacity for in vivo imaging in a transgenic mouse model. The current work could open up avenues for the cost-effective monitoring of the tau protein aggregation state in animal models as well as tissue staining. Furthermore, these fluorophores could serve as the basis for the development of clinically relevant sensors, for example based on PET imaging.</P>
The small molecule phenamil is a modulator of adipocyte differentiation and PPARγ expression
Won Park, Kye,Waki, Hironori,Choi, Sung-Pil,Park, Ki-Moon,Tontonoz, Peter The American Society for Biochemistry and Molecula 2010 Journal of lipid research Vol.51 No.9
<P>We previously described the use of a cell-based screening approach to identify small molecules that regulate adipocyte differentiation. Here we identify the amiloride derivative phenamil as an adipogenic compound. Phenamil acutely induces expression of the key transcription factor of adipogenesis, peroxisome proliferator-activated receptor γ (PPARγ) and, consequently, promotes the differentiation of multiple preadipocyte cell lines, including 3T3-L1 and F442A. Interestingly, the adipogenic action of phenamil is distinct from and additive with both PPARγ ligands and the previously identified adipogenic small molecule harmine. To identify signaling pathways mediating phenamil's effects, we performed transcriptional profiling of 3T3-F442A preadipocytes. ETS variant 4 (ETV4) was identified as a gene rapidly induced by phenamil but not by other adipogenic small molecules or PPARγ agonists. Transient expression of ETV4 in preadipocytes enhances the expression of PPARγ. Stable overexpression of ETV4 promotes expression of PPARγ and its downstream target genes and enhances morphological differentiation. Finally, knockdown of PPARγ expression by shRNA blocks the effects of phenamil on adipocyte differentiation and gene expression, but it does not block phenamil induction of ETV4, which suggests that ETV4 acts upstream of PPARγ in differentiation processes. These results identify a phenamil as new small molecule tool for the probing of adipocyte differentiation that acts, at least in part, through induction of ETV4 expression.</P>
Won, Young Suk,Vandamme, Peter,Yoon, Jung Hoon,Park, Yong Ho,Hyun, Byung Hwa,Kim, Hyoung Chin,Itoh, Toshio,Tanioka, Yoshikuni,Choi, Yang Kyu Oxford University Press 2007 FEMS microbiology letters Vol.271 No.2
<P>A slowly growing microaerophilic Helicobacter species was isolated from the feces of the common marmoset (Callithrix jacchus). This bacterium possessed a pair of nonsheathed bipolar flagella, was positive for oxidase, catalase and alkaline phosphatase activities, but was negative for gamma-glutamyltranspeptidase and urease activity and for nitrate reduction. The bacterium was susceptible to nalidixic acid and resistant to cephalotine and did not hydrolyze hippurate. On the basis of phenotypic characteristics, 16S rRNA gene sequence analysis and whole-cell protein profiles, the isolate represents a new species of the genus Helicobacter, for which the name Helicobacter callitrichis sp. nov. is proposed; the type strain of the new species is R-204(T) (GenBank accession number AY192526).</P>
A statistical approach on demographic dynamics and population projection in Tanzania
Peter A. Mwandri,Kee-Won Lee,Songyong Sim 한국데이터정보과학회 2018 한국데이터정보과학회지 Vol.29 No.2
Population projection provides profound information to policy makers of formulation of policies and decision making. It also provides information about evaluation of the progress towards achieving Millennium Development Goals in Tanzania. We use five different models to project Tanzanian population: linear model, exponential model, modified exponential model, logistic model and cohort component model. Among these models, logistic growth model provides the lowest projection followed by modified exponential model. On the other hand, the exponential growth model gives the highest projection followed by cohort component model. Cohort component model seems to be the best projection model among the above mentioned models since it incorporates birth, death and migration information in projection process.