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Choi, Jonghye,Kim, Hyejin,Choi, Jinhee,Oh, Seung Min,Park, Jeonggue,Park, Kwangsik The Korean Society of Environmental Toxicology 2014 환경독성보건학회지 Vol.29 No.-
Objectives Effects of nanoparticles including zinc oxide nanoparticles, titanium oxide nanoparticles, and their mixtures on skin corrosion and irritation were investigated by using in vitro 3D human skin models ($KeraSkin^{TM}$) and the results were compared to those of an in vivo animal test. Methods Skin models were incubated with nanoparticles for a definite time period and cell viability was measured by the 3-(4, 5-dimethylthiazol-2-yl)-2.5-diphenyltetrazolium bromide method. Skin corrosion and irritation were identified by the decreased viability based on the pre-determined threshold. Results Cell viability after exposure to nanomaterial was not decreased to the pre-determined threshold level, which was 15% after 60 minutes exposure in corrosion test and 50% after 45 minutes exposure in the irritation test. IL-$1{\alpha}$ release and histopathological findings support the results of cell viability test. In vivo test using rabbits also showed non-corrosive and non-irritant results. Conclusions The findings provide the evidence that zinc oxide nanoparticles, titanium oxide nanoparticles and their mixture are 'non corrosive' and 'non-irritant' to the human skin by a globally harmonized classification system. In vivo test using animals can be replaced by an alternative in vitro test.
Choi, Hyejin,Jeong, Kwangsik,Chae, Jimin,Park, Hanbum,Baeck, Juheyuck,Kim, Tae Hyeon,Song, Jae Yong,Park, Jaehun,Jeong, Kwang-Ho,Cho, Mann-Ho Elsevier 2018 Nano energy Vol.47 No.-
<P><B>Abstract</B></P> <P>A comprehensive understanding of the nano-structural effects that cause reduction in thermal conductivity represents important challenges for the development of thermoelectric materials with an improved figure of merit ZT. Bismuth telluride (Bi<SUB>2</SUB>Te<SUB>3</SUB>)-based thermoelectric materials exhibit very low levels of thermal conductivity. In this study, a Te crystal-embedded Bi<SUB>2</SUB>Te<SUB>3</SUB> (Te–Bi<SUB>2</SUB>Te<SUB>3</SUB>) thin film was formed by establishing a specific annealing temperature for a Te-rich Bi/Te multilayered structure. Modulations in structure and composition were observed at the boundaries between the two phases of Te and Bi<SUB>2</SUB>Te<SUB>3</SUB>. Furthermore, the samples contained regularly shaped nanometer-scale Bi<SUB>2</SUB>Te<SUB>3</SUB> single grains. Therefore, we obtained a dramatic ZT value of 2.27 (+ 0.04, − 0.08) at 375 K from the Te–Bi<SUB>2</SUB>Te<SUB>3</SUB> thin film. Finally, we confirmed that interface phonon scattering between the Te–Bi<SUB>2</SUB>Te<SUB>3</SUB> boundaries plays an important role in inter-grain phonon transport, which results in a reduction in the lattice thermal conductivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Te-Bi<SUB>2</SUB>Te<SUB>3</SUB> nano-grain structure is synthesized by multi-layer deposition and simple annealing process. </LI> <LI> Obtain a dramatic zT value of 2.27 (+ 0.04 − 0.08) at 375 K in Te embedded-Bi<SUB>2</SUB>Te<SUB>3</SUB> thin film. </LI> <LI> The Te-Bi<SUB>2</SUB>Te<SUB>3</SUB> heterojunction has high electrical conductivity and low thermal conductivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Jungil,Yoo, Jungheon,Kim, Ki-jung,Kim, Eun-Geun,Park, Kyung Ock,Kim, Hyejin,Kim, Haeun,Jung, Hyunju,Kim, Taeyoung,Choi, Myungjin,Kim, Hee Chan,Ryoo, Sungweon,Jung, Yong-Gyun,Kwon, Sunghoon Springer-Verlag 2016 Applied microbiology and biotechnology Vol.100 No.5
<P>Tuberculosis (TB) is a major global health problem, and multi-drug-resistant TB (MDR-TB) and extensively drug-resistant TB (XDR-TB) are spreading throughout the world. However, conventional drug susceptibility test (DST) methods, which rely on the detection of the colony formation on a solid medium, require 1-2 months to the result. A rapid and accurate DST is necessary to identify patients with drug-resistant TB and treat them with appropriate drugs. Here, we used microscopic imaging of Mycobacterium tuberculosis (MTB) immobilized in an agarose matrix for a rapid DST. The agarose matrix, which was molded in a microfluidic chip, was inoculated with MTB, and TB drugs in liquid culture medium diffused throughout the agarose to reach the MTB immobilized in the agarose matrix. After the responses of MTB to drugs were tracked with an automated microscopic system, an image-processing program automatically determined the susceptibility and resistance of MTB to specific doses of TB drugs. The automatic DST system was able to assess the drug susceptibility of various drug-resistant clinical TB strains within 9 days with an accuracy comparable to that of conventional method. Our rapid DST method based on microscopic time-lapse imaging greatly reduces the time required for a DST and can be used to rapidly and accurately treat TB patients.</P>
Diagnostic imaging of malignant insulinoma in a dog
Choi, Jihye,Keh, Seoyeon,Kim, Sungsoo,Lee, Su-Hyung,Kim, Hyejin,Choi, Heeyeon,Lim, Younji,Kim, Hyunwook,Kim, Ahyoung,Kim, Dae-Yong The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.3
Endocrine test data from a 13-year old intact female Maltese was indicative of the presence of an insulinoma, however ultrasonography identified a pancreatic mass only after 10 months after the first admission. Following identification of both pancreatic tumor and hepatic metastasis on computed tomography (CT), surgical excision of the mass was attempted. However, total excision failed because of tumor adhesion to adjacent large vessels. The pancreatic mass was monitored over the next 25 months via ultrasonography, CT, and positron emission tomography-computed tomography (PET-CT). Histopathological and immunohistochemical data confirmed the diagnosis of insulinoma with hepatic metastasis.
Hyejin Choi,Sangdon Ryu,Daye Mun,Woongji Lee,An Na Kang,Mingeun Kang,Hayoung Kim,Daniel Lee,Sangnam Oh,Younghoon Kim 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Bacillus coagulans is a gram-positive, spore-forming and potential probiotic bacterium in food industry. Spore-forming bacteria is enable to survive in the host"s gastrointestinal tract functioning as probiotics that could play a beneficial role in the host health. We evaluated the probiotic characteristics including acid, bile and heat tolerance of B. coagulans SRCM121381 isolated from human breast milk. SRCM121381 showed high resistance to acid and bile, heat tolerance. We employed FIMM (Fermentor for Intestine Microbiota Model) system to evaluate effects of SRCM 121381 on the microbial dynamics in gut environments. SRCM121381 resulted in increased population of Romboutsia and Turicibacter at the genus level, while the abundance of Escherichia decreased significantly. We added SRCM 121381 with starter strains for Gouda cheese using micro-cheese platform and evaluated on the change of cheese flavor. SRCM121381 increased acetic acid (Vinegar) and decreased esters and ketone as undesirable flavor such as bitter taste. Our results propose that potential probiotic bacterium B. coagulans SRCM121381 could be applied on dairy foods as an adjunct starter with flavor productivity.
Dongwon Choi,Hyejin Bang,Bartosz W. Wojdynski,Yen-I Lee,Kate M. Keib,Camila Espina,Kacy Kim 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Viral video advertising as a branded entertainment has shown its potential to overcome consumer skepticism by spreading the brand message through individuals’ social connection. Although brand placement prominence and brand disclosure may be critical factors that influence forwarding intention in the viral video ad context, less research has examined these relationship. To fill these gaps, this study aims 1) to examine the psychological mechanisms through which the brand placement prominence influences consumers’ forwarding intention of viral video advertising, and 2) to investigate the potential moderating role of brand disclosure timing. This study shows that the level of brand prominence in a viral video ad is an important factor influencing viewers’ forwarding intention sequentially mediated by persuasion knowledge, critical processing and enjoyment. The moderating role of brand disclosure timing investigated in the current study suggests that when the branded viral video has a high level of brand prominence, post brand disclosure leads to a higher forwarding intention compared to the prior brand disclosure.