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연안생태계에서 아미노산의 질소 안정동위원소 비를 이용한 배경질소 안정동위원소 비 파악
최보형(Bohyung Choi),최현태(Hyuntae Choi),신경훈(Kyung-Hoon Shin) 전남대학교 수산과학연구소 2020 수산과학연구소논문집 Vol.28 No.2
In order to estimate trophic position and to determine nitrogen isotopic baseline in the coastal ecosystems, present study analyzed nitrogen isotope ratio of individual amino acid of oyster which sampled in two different estuaries. Trophic position (TP) of oysters estimated by nitrogen isotope ratio of bulk tissue showed spatial and temporal variation (1.4 to 2.2), while trophic position of oyster estimated by nitrogen isotope ratio of amino acids was nearly varied between sampling sites and seasons (1.8 to 2.2). In addition, present study showed depleted nitrogen isotope ratio of phenylalanine compare to that of bulk tissue in the sampled oysters (approximately 3.0‰). The light nitrogen isotope ratio of phenylalanine is expected to be an indicator of nitrogen isotopic baseline with elimination of trophic enrichment in the consumers. Moreover, we estimated nitrogen isotopic baseline using both bulk and compound specific nitrogen isotope ratio of oyster and found similar values among sampling sites and seasons. The suggested estimation will be alternatively applied to the trophic ecology.
Seo, Bohyung,Lim, Kyungseop,Kim, Sung Soo,Oh, Kyung Taek,Lee, Eun Seong,Choi, Han-Gon,Shin, Beom Soo,Youn, Yu Seok Elsevier 2019 Colloids and surfaces Biointerfaces Vol.179 No.-
<P><B>Abstract</B></P> <P>Photothermal therapy using gold nanorods (AuNRs) has gained great attention for cancer therapy because AuNRs emit heat and induce tumor cell death responding to the near infrared light. However, the anticancer efficiency of AuNRs alone is undermined by its poor in vivo stability and potential toxicity. The prime purpose of this study was to send more AuNRs into tumors to more fully ablate them. For this, we fabricated hybrid albumin nanoparticles encapsulating small AuNRs (AuNRs-Alb-NPs), which take advantage of biocompatible albumin as a carrier, with better tumor targetability and high in vivo photothermal activity. The sizes of length/width of AuNRs were approximately 20.5 nm and 4.6 nm, respectively, showing a 4.5 aspect ratio, and the size of the resulting AuNRs-Alb-NPs was ˜130 nm, all of which are favorable for glomerular filtration and passive tumor targeting via extravasation. We chose the best formulation for AuNRs-Alb-NPs by in vitro cytotoxicity based on photothermal conversion efficiency considering the incorporated number of AuNRs. Visualized by a photothermal camera, the local tumor temperature of mice treated with AuNRs-Alb-NPs increased to 57℃, which was sufficient for the hyperthermal effect with 808 nm laser irradiation. Subsequently, AuNRs-Alb-NPs displayed remarkably better tumor ablation vs. naïve formulation of AuNRs (tumor volume: 73.8 ± 105.8 vs. 1455.3 ± 310.4 mm<SUP>3</SUP> at day 8) in the glioblastoma N2a tumor-bearing mice. Most of all, we demonstrated, using photoacoustic imaging and inductively coupled plasma mass spectrometry, that this much better tumor ablation was due to enhanced tumor targeting with albumin nanoparticles. We believe our AuNRs-Alb-NPs should be considered promising photothermal agents that are safer, have good targetability, and exhibit excellent tumor ablation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed a prototype of small gold nanorods-loaded albumin nanoparticles. </LI> <LI> The nanoparticles exhibited noticeable cytotoxicity on the glioblastoma N2a cells. </LI> <LI> The nanoparticles were much more potent in killing N2a tumors in vivo versus naïve gold nanorods. </LI> <LI> The hybrid albumin nanoparticles would be a potential photothermal agent for treating brain cancer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Novel Multiple Output Converter using Quasi Load
Kyusik Choi(최규식),Byeongchul Hyun(현병철),Seoungwoon Lee(이승운),Bohyung Cho(조보형) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
In this paper, a novel multiple output converter using quasi load is proposed. Conventional multiple output converters using multiwinding transformer has poor output voltage regulations. To solve this problem, there are many proposals like post regulation method, weighted control method, and etc. However, the post regulation method regulates output voltage tightly but its conduction loss and cost are increased. And the weighted control can achieve high efficiency and low cost but its regulation is not enough. To solve these problems, this paper proposes a novel multiple output converter using quasi load. The proposed method uses a quasi load which acts like an active dummy load for tight regulation but there is rarely increase of loss and cost. The proposed method is verified by hardware test by two output(24V and 15V) flyback type converter.
최규식(Kyusik Choi),김혜진(Hyejin Kim),배현수(Hyunsu Bae),조보형(Bohyung Cho) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
기존의 교류배전 시스템의 신재생 에너지원과의 연동 비용이성을 해결하고 전체 시스템의 효율을 높이기 위해 연구되고 있는 직류배전 시스템으로 전환하기 위해서는 옥내배선용 도선의 재검토가 필수적이다. 따라서 본 논문에서는 직류배전 전압 및 부하전류, 도선의 종류와 길이, 각종 규제사항 등을 고려하여 가정용 직류배전 시스템 적용에 적합한 도선 선정을 위한 가이드라인을 제시하고 이를 보급형 100㎡ 형 주택을 기준으로 한 시뮬레이션을 통해 타당성을 보인다.
Lee, Hesol,Kang, Bohyung,Choi, Jun-Yong,Park, Sunju,Lee, Myeong Soo,Lee, Ju Ah Wolters Kluwer Health 2018 Medicine Vol.97 No.18
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P><B>Introduction:</B></P><P>Eunkyosan (EKS) is widely used for common colds in East Asian countries. Many clinical trials assessing the efficacy and safety of EKS formula for the treatment of common colds have been reported. This review will assess the clinical evidence for and against the use of EKS formula as a treatment for common colds.</P><P><B>Methods and analysis:</B></P><P>Fourteen databases will be searched from inception until March 2018. We will include randomized controlled trials (RCTs) assessing EKS decoctions for any type of common cold. All RCTs of decoctions or modified decoctions will be included. The methodological qualities of the RCTs will be assessed using the Cochrane Collaboration tool for assessing risk of bias, while confidence in the cumulative evidence will be evaluated using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) instrument.</P><P><B>Ethics and dissemination:</B></P><P>This systematic review will be published in a peer-reviewed journal and will also be disseminated electronically and in print. The review will be updated to inform and guide healthcare practices.</P><P><B>Registration number:</B> CRD42018087694</P></▼2>
Won, Eun-Ji,Choi, Bohyung,Hong, Seongjin,Khim, Jong Seong,Shin, Kyung-Hoon Elsevier 2018 Environmental pollution Vol.238 No.-
<P><B>Abstract</B></P> <P>During the last several decades, persistent organic pollutants and metals cause great concern for their toxicity in organisms as well as for their bioaccumulation and/or trophic transfer through the food chains in ecosystems. A large number of studies therefore have focused on the trophic levels of organisms to illustrate food web structure, as a critical component in the study of pollutant dynamics and biomagnification. The trends in biomagnification of pollutants in food webs indeed provide fundamental information about the properties and fates of pollutants in ecosystems. The trophic magnification supports the establishment of a reliable trophic structure, which can further aid the understanding of the transport and exposure routes of contaminants in accumulation and risk assessments. Recently, efforts to interpret the food web structure using carbon and nitrogen stable isotope ratios have contributed to better understanding of the fate of pollutants in the ecosystem. However, it is known that this isotope analysis of bulk ones has many weaknesses, particularly for uncertainties on the estimate of trophic levels and therefore of magnification factors for studied organisms, enough to support a regulatory interpretation. In this review, we collate studies that investigated biomagnification characteristics of pollutants in aquatic ecosystems, along with calculated trophic magnification factors. Moreover, we introduce a novel approach, compound-specific stable isotope analysis of nitrogen in amino acids, to establish reliable food web structures and accurate trophic levels for biomagnification studies. This method promises to provide sound results for interpreting the influence of the pollutant in organisms, along with their bioaccumulation and magnification characteristics, as well as that in ecosystem.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bioaccumulation of pollutants is a crucial issue with repercussions in organisms. </LI> <LI> Transfers of pollutants through food chain are important fate of pollutants. </LI> <LI> Trophic magnification factor is considered as one of the great issue on pollutants. </LI> <LI> Compound specific isotope analysis (CSIA) allows presenting sound trophic levels. </LI> <LI> Reliable food web structure deepens a field on biomagnification and pollutants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>