Facile and fast Na-ion intercalation employing amorphous black TiO_2-x/C composite nanofiber anodes

Lee, Na-Won,Jung, Ji-Won,Lee, Jun-Seo,Jang, Hye-Yeon,Kim, Il-Doo,Ryu, Won-Hee Elsevier 2018 ELECTROCHIMICA ACTA Vol.263 No.-

<P><B>Abstract</B></P> <P>Structural and electronic modification of titanium oxide (TiO<SUB>2</SUB>) nanomaterials induced by the co-introduction of fully disordered glass phase and oxygen vacancies can lead to remarkable advances in the electrode performance in emerging energy storage systems. We report on the effective co-creation of fully amorphous nanofibers (NFs) composed of black TiO<SUB>2-x</SUB> and conductive carbons throughout the NF structure, and evaluate the materials as potential anodes in sodium-ion batteries. The black TiO<SUB>2-x</SUB> nanofiber is successfully fabricated by electrospinning a precursor solution followed by a two-step sequential thermal treatment in an air and reducing atmosphere. The NF electrode could deliver approximately two-fold higher 2nd discharge capacity and an excellent kinetic performance even under high rates compared to that delivered by anatase-structured white TiO<SUB>2</SUB> NFs used as reference, because of (i) an inherent free volume in the glass phase corresponding to the enlarged Na<SUP>+</SUP> sites, (ii) increased electrical conductivity (low bandgap) resulting from the presence of Ti<SUP>3+</SUP>, (iii) introduction of conductive carbon agents around the TiO<SUB>2-x</SUB> domain, and (iv) one-dimensional NF feature allowing numerous Na<SUP>+</SUP> reaction sites at the electrochemical interface. We also elucidate the morphological and structural changes in the nanofibers after discharge and charge by <I>ex-situ</I> characterizations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We succeed in co-creating amorphous nanofiber structure composed of black TiO<SUB>2-x</SUB> and conductive carbons. </LI> <LI> Black TiO<SUB>2-x</SUB>/carbon nanofibers are prepared by electrospinning followed by a two-step thermal treatment. </LI> <LI> Black TiO<SUB>2-x</SUB>/carbon nanofiber delivers excellent electrochemical performance compared to those of anatase TiO<SUB>2</SUB> nanofiber. </LI> <LI> The benefits and reaction mechanism of the black TiO<SUB>2-x</SUB>/carbon nanofiber anode in the Na-ion cell operation is elucidated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

하이퍼 파라미터 최적화 기법을 적용한 이상 거래 탐지 시스템

이원준(Won-Joon Lee),서민혜(Min-Hye Seo),신나라(Na-Ra Shin) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6

This paper proposes new Fraud Detection System with Hyper-parameter Optimization to develop for the limitations of existing FDS. We use Hyper-parmeter Optimization Algorithm that Naïve Evolution Algorithm(based Genetic Algorithm) and Tree-structured Parzen Estimator Algorithm(based Bayesian Optimization Algorithm). The main result of this study is TPE Algorithm shows better AUPRC values in less time than the Naïve Evolution Algorithm on two FDS Data Sets. The contribution of this paper is the improvement of FDS with HPO algorithm.

Genetic Characterization of Haemagglutinin 1 Domain of Influenza B Viruses Isolated in Korea during $1988{\sim}1999$

Shin, Gu-Choul,Na, Byoung-Kuk,Lee, Joo-Yeon,Ahn, Jung-Bae,Park, Jong-Won,Lee, Jin-Soo,Kim, Jee-Hee,Kim, Woo-Joo,Kang, Chun The Korean Society for Microbiology 2003 Journal of Bacteriology and Virology Vol.33 No.4

Although Korean influenza virus isolates have been genetically associated with the vaccine strains of the corresponding year, influenza B viruses have prevailed almost every year in Korea during the past decades. We have 'analyzed the genetic characteristics and evolutionary patterns of the haemagglutinin (HA) 1 domains of influenza B viruses isolated during 1988-1999 using direct RT-PCR and sequencing. Phylogenetic analysis of influenza B viruses isolated in Korea indicated that antigenically and genetically distinguishable strains of the lineage II and lineage III variants had been cocirculated. Variants prevailed in early 1990s are represented in 1996/97 and 1998/99 and some different variants have been co circulated geographically and prevailed concurrently in Korea. All HA1s of Korean isolates have amino acid substitutions mainly in the region between position 124 and 310, which was previously proposed an immunodominant region. Insertion-deletion patterns of the HA gene revealed that Korean influenza B viruses were evolved from Lee40 with different manner between lineage II and III viruses. Lineage III viruses were also divided into two groups as conserved group and inserted group, in relation to Lee40. But lineage II viruses had evolved with directional pattern. Antigenic index proposed that influenza B isolates prevailed since 1996/97 seasons might had emerged from the antigenic variants of a Seo1697-like virus and that new variants might appear from the lineage II viruses resulting in persistent prevalence in Korea.

대학생의 성별에 따른 외모와 취업 스트레스 및 취업불안과의 관계

조미경 ( Mi Kyoung Cho ),최은지 ( Eun Ji Choi ),이지원 ( Ji Won Lee ),이유나 ( Yu Na Lee ),채지영 ( Ji Young Chae ) 서울대학교 간호과학연구소 2013 간호학의 지평 Vol.10 No.2

본 연구는 대학생의 성별에 따른 외모만족도, 외모관심도, 면접에서의 외모비중, 취업 스트레스, 취업불안을 파악하기 위해 수도권 4년제 대학에 재학 중인 3, 4학년 남녀 대학생 각 85명씩, 총 170명을 대상으로 수행되었다. 본 연구결과, 외모 만족도는 남학생이 여학생보다 의미 있게 높게 나타났으며, 특히 일반적 특성에서 종교와 외모관리 여부에서 남학생이 여학생보다 의미 있게 높았다. 이것은 외모에 관심이 많은 여학생들이 남학생들에 비해 외모에 대한 만족정도가 낮고 더 많은 갈등을 느끼고 있다고 보고한 선행 연구14)의 결과와 일치하였고, 이는 여학생이 남학생보다 외모를 자신의 가치를 높이는 중요한 수단으로 인식하고 있음을 반영하였다. 이러한 현상은 대중매체를 통해 주입된 외모지상주의의 영향이 크며, 외모를 개인의 경쟁력이라고 생각하는 우리나라의 전반적인 사회풍조와 무관하다고 볼 수 없다. 본 연구결과, 외모만족도가 낮은 여학생에서 외모관심도가 높게 나타날 것이라고 예상된 결과대로 여학생이 남학생보다 의미 있게 높았고, 특히 외모관리여부에서 여학생이 남학생보다 외모관심도가 높게 나타났다. 이는 Song15)과 Mellor 등16)의 결과와 일치하였다. 본 연구결과, 연령에 따른 외모관심도는 연령이 어릴수록, 학년이 높을수록 외모관심도 평균은 높았지만, 통계적으로 유의한 차이를 보이지 않았다. 이는 Kim17)의 연구에서 학년이 어릴수록 외모관심도가 높다고 보고한 것과 다소 일치하지만, Lee18)와 Kim17)에서 나온 결과인 연령이 높을수록 외모관심도가 높게 나타난 것과 다소 상이한 결과를 나타냈다. 이것은 본 연구가 대학교 3, 4학년 학생들만을 대상으로 한 것이고, 본 연구의 4학년 학생들 중 21%는 간호대 학생으로서 이미 취업을 한 상태이므로, 취업을 위한 외모관심도는 한창 취업불안이 높은 3학년 학생들이 더 높았을 것으로 사료된다. Kim17)의 연구에서 학년이 어릴수록 외모관심도가 높다고 보고한 것은 요즘 대학생들의 가장 큰 고민인 취업으로 인하여 대학생들의 취업에 대한 불안과 스트레스가 높고, 그 결과 선배들의 취업 준비와 취업 현황을 지켜보고 있는 하위학년이 취업과 관련 있는 외모에 높은 관심을 나타낸 것으로 보인다. 취업준비를 하는 대학생들에서는 취업과 관련된 외모관심도가 연령과 학년에 따라 다르게 나타날 수 있으므로, 취업여부가 결정되기 전에 자료를 수집하여 비교하는 것이 필요할 것이라 사료된다. 또한 취업불안으로 인해 외모 관리에 신경을 많이 쓰는 미취업 학생들과 취업한 선배들 간에 취업에 필요한 정보를 공유하는 것이 도움이 될 것이라고 생각한다. 본 연구에서 면접에서의 외모비중은 성별에서는 차이가 없었으나 성별과 면접 시 외모비중간의 상호작용효과는 유의한 차이가 있는 것으로 나타났다. 국내에서 면접관들이 주의 깊게 보는 사항에 관한 설문에서 1위가 외적 이미지가 83%를 차지하고 그 외 입사열정, 인성, 설득력 있는 답변 및 상황대처 능력, 눈 마주침 순으로 나온 연구결과19)와 면접에서의 외모 효과에 대한 내용은 일맥상통하지만, 성별과 면접 시 외모비중의 상호작용효과에 대한 비교 논문이 없어서 성별과 면접시 외모비중의 상호작용효과에 따른 비교는 직접적으로 할 수 없는 상황이다. MBA 면접상황에서 외모의 효과를 실험한 연구에서는 비록 외모가 직접적으로 면접점수에 영향을 미치지는 못하지만, 외모와 의사소통능력의 상호작용으로 면접점수에 영향을 주는 것으로 보고한 연구20)도 있어서 면접자와 피면접자의 면접 평가에 대한 비교연구가 필요하리라 생각된다. 또한 최근 대학생들의 취업준비 행동에 대한 연구가 증가하고 있는데 Suk과 Choi21)에 의하면 취업을 위한 준비행동으로 학생들이 대부분 자격증 획득을, Park과 Ban22)에 의하면 대학생의 절반 이상이 재학 중에 외국어 시험을 준비하고 응시한다고 하였다. 하지만 취업준비행동과 외모관리에 대한 연구는 미흡하여 그 관계를 알기가 어려웠다. 따라서 대학생들의 취업준비행동에 있어서 외모관리와의 관련성을 파악하는 연구가 필요하고, 취업을 위해 긍정적인 외적 이미지 확립과 취업에서 필요한 외모관리를 위한 정보제공이 취업자를 대상으로 이루어져야 할 것이다. 본 연구에서 취업 스트레스는 성별에 따라 유의한 차이는 없었으나, 일반적 특성에서 학년과 성별, 취업여부와 성별, 면접 시 외모비중과 성별 간에는 유의한 상호작용효과를 나타냈다. 성별에 따라 취업 스트레스에 차이가 없었던 결과는 Kim23)의 연구와는 일치하였으나, Suk과 Choi21)의 연구에서는 남학생의 72%가 학교의 위상이 취업에 크게 영향을 끼친다고 생각하여 취업 스트레스가 남학생이 여학생보다 더 높게 나타난 결과와 Shin과 Chang24)의 연구에서 대학 4학년 학생을 대상으로 조사한 취업 스트레스에서 여학생이 남학생보다 더 높았다고 보고한 결과와는 상이하였다. 본 연구의 대상자는 보건계열 3학년 학생비율이 높고 4학년 학생의 58%가 취업이 된 상태였기 때문에 취업 스트레스는 학년에 따른 차이를 보이지 않은 반면, Kim23)의 연구에서는 연구대상자가 일반대학 학생들로 남학생과 4학년 학생 비율이 높았고, 자료수집기간에 취업 준비의 막바지에 있는 4학년 학생들이 3학년 학생들에 비해 유의하게 높은 취업 스트레스를 보고한 것으로 사료된다. 본 연구에서 취업 스트레스는 3학년에서는 여학생이 높았고, 4학년에서는 남학생이 높게 나타남으로써 학년과 성별 간 상호작용효과를 나타냈다. 이는 본 연구의 대상자인 여학생은 전수가 간호대 학생이었고, 남학생의 경우는 간호대학생과 다른 학과 학생이 섞여 있음으로 여학생에서는 선배들의 취업준비와 결과를 지켜보면서 얼마 남지 않은 취업준비기간에 대한 부담감이 작용했기 때문으로 생각되며, 남학생에서는 대부분이 간호학과가 아닌 다른 보건계열 학생들로서 본격적인 취업준비기간이 아니었기 때문으로 생각되어진다. 본 연구결과, 취업불안은 성별에 따라 유의한 차이는 없었으나, 학년과 성별, 취업여부와 성별, 외모관리여부와 성별, 면접 시 외모비중과 성별 간에는 상호작용효과가 나타났다. 학년에 따라 여학생에서는 3학년이, 남학생에서는 4학년이 취업불안이 더 높게 나타남으로써 Kim과 Choi25)의 일반대학생을 대상으로 한 연구에서 3학년에 비해 4학년에서 취업불안을 더 많이 느낀다는 결과와 다소 일치하였다. 본 연구에서 성별에 따른 취업불안의 차이는 없었으나 여학생의 취업불안이 전체 평균 66.51±23.22, 남학생이 70.19±21.80로 남학생의 취업불안의 평균이 높았던 것에 반해 남자보다 여자가 취업불안이 높다고 보고한 연구결과26)와는 상반된 결과를 보여주고 있었다. 이것은 위에서 언급하였듯, 여학생의 경우가 남학생보다 취업이 더 많이 이루어졌기 때문으로 생각된다. 대학생의 취업불안, 우울, 자살생각을 본 연구25)에서 같은 척도로 측정된 취업불안의 평균이 평균 75.6±22.4와 비교하였을 때, 본 연구에서의 취업불안이 조금 낮은 평균을 보여주고 있는 데, 이는 연구대상자들이 보건계열학과의 학생들로 비교적 일반 대학생들에 비해 취업이 용이하기 때문에 취업불안이 약간 낮게 나타난 것으로 사료된다. 또한 본 연구에서 취업여부에 따라 취업한 학생들에 비해 미취업 학생들이 취업불안이 높은 것으로 나타났는데, 취업 전에 취업불안이 높은 것은 당연한 결과로 사료된다. 본 연구결과 남녀 대학생 모두 취업 불안이 높을수록 취업 스트레스가 높은 것으로 나타났고, 남학생에서는 외모 관심도가 높을수록, 여학생에게서는 면접 시 외모비중이 높다고 인지할수록 취업 불안이 높은 것으로 나타났다. 이를 통해 남녀 대학생의 취업 불안에 외모 요인이 영향을 미치고 있음을 알 수 있었으며, 이는 취업에 있어 면접 시 외모에 대한 평가로 취업유무가 좌우된다고 생각하기 때문인 것으로 사료된다. 이러한 결과는 Shin27)의 연구에서 면접관이 지원자의 용모를 면접 평가의 중요한 기준으로 보기 때문에 외모관리에 대한 스트레스가 취업 스트레스로 이어진 것이라고 볼 수 있다. Cho28)의 비서전공자 대상의 취업 관련 변인에 관한 탐색적 연구에서 졸업생들이 취업에 영향을 미쳤다고 인식하는 중요도의 순서는 인성, 자격증 순으로 나타났고, 그 다음으로 외국어, 학력, 외모는 동일한 순위로 나타났다. 또한 Yang 등29)의 지원자와 면접관의 상호비교를 중심으로 승무원 채용을 위한 평가항목에 대한 연구에서 승무원 채용과정을 살펴보면, 다양한 면접관과 다양한 면접 방법을 활용함으로써 채용과정에서 면접이 차지하는 비중이 매우 높았고, 항공사별 승무원 채용 기준으로 단정한 이미지와 용모를 인재 상으로 제시하고 있었다. 본 연구에서 취업면접시의 이미지가 면접의 성과에 크게 영향을 미치고 있는 사회현상4-7,27-29)에 따라 취업불안과 취업 스트레스가 높은 사람들은 취업 면접 시 취업하기 위한 기관에서 원하는 이미지를 만들기 위해 노력하므로 취업기관별 어떠한 이미지를 추구하는지에 대한 연구가 향후에 진행되어야 할 것이다. Purpose: The purpose of this study was to evaluate the differences between the level of satisfaction and concern regarding appearance according to gender, the importance of appearance in job interviews, and the influence appearance has on job-seeking stress and anxiety under the ever-increasing pressure on students to secure employment so that appropriate psychological interventions can be provided to undergraduates. Methods: The survey was conducted on 170 third and fourth year undergraduates in Gyeonggi province from August 31st to September 6th, 2012 to figure out the correlations and differences in variables of appearance satisfaction and concern, and the importance of appearance in job interviews and job-seeking stress and anxiety according to the differences in gender. Data were analyzed by descriptive statistics, independent t-test, two-way ANOVA, and Pearson`s correlation analysis. Results: 1. There was difference between the genders for appearance satisfaction and concern. The level of satisfaction was higher in male students while concerns regarding appearance were higher in female students. There was no gender difference regarding the importance of appearance in job interviews, job-seeking stress, and job-seeking anxiety. 2. For the concerns in appearance, there was a significant difference between the genders in appearance management, and gender and the importance of appearance in job interviews showed significant interactive effects. Stress and anxiety from job-seeking did not show significant differences between the genders, but there were common significant interactive effects between gender and grades, gender and employment, and gender and the importance of appearance in job interviews. 3. Both male and female students showed higher job-seeking stress as their job-seeking anxiety was higher. Job-seeking anxiety was higher in male students who had higher concern in appearance, and in female students who placed more emphasis on the importance of appearance in job interviews. Conclusion: As female students perceived appearance in job interviews as important more than male students, their job-seeking anxiety was higher, while male students who showed higher concern in appearance also showed higher level of anxiety in job-seeking. As job-seeking anxiety was higher, job-seeking stress was also higher according to the entire participants, based on this result, methods to decrease job-seeking anxiety should be suggested.

Paramolar tubercle이 융합된 상악 제2소구치의 비외과적 근관치료

최다경(Da-Kyung Choi),장훈상(Hoon-Sang Chang),황윤찬(Yun-Chan Hwang),황인남(In-Nam Hwang),오원만(Won-Mann Oh),박찬(Chan Park),이빈나(Bin-Na Lee1) 대한턱관절교합학회 2021 구강회복응용과학지 Vol.37 No.4

오공약침의 안전성에 대한 임상적 연구

소기숙,최회강,박소영,고강훈,김성남,이옥자,윤민영,문형철,김성철,이정훈,나원경,So, Ki-suk,Choi, Hoi-kang,Park, So-young,Koh, Kang-hun,Kim, Sung-nam,Lee, Ok-ja,Yun, Min-young,Mun, Hyung-chul,Kim, Sung-chul,Lee, Jung-hun,Na, Won-kyung 대한침구의학회 2004 대한침구의학회지 Vol.21 No.1

Objective: Recently scolopendrid aquacupuncture has been a good effect on pain control but it has not been known about clinical safety. So, In order to prove the clinical safety of scolopendrid aquacupuncture, We have observed the physical reac-tion and clinical pathology test after scolopendrid aquacupuncture treatment. Methods: We analyzed physical reaction and clinical pathology test before and after Scolopendrid aquacupuncture treatment of 30 patients suffering from pain, who admitted department of Acupunture and Moxibustion, College of Oriental Medicine, Won-Kwang University Kwangju hospital. Results & Conclusions: The results were summarized as follows. 1) The distribution of sex was 14 males and 16 females, and the average of patients age was 46.2 years. 2) The distribution of symptom was lumbago, lumbago with radiating pain, nuchal pain and knee joint pain. 3) In the 30 patients treated with Scolopendrid aquacupuncture, hematologic test did not show remarkable change. 4) In the 30 patients treated with Scolopendrid aquacupuncture, Liver function test(AST, ALT, ALP) showed a slight decrease on the contrary, and abnormal rate showed a decrease of 1.0%(from 3.3% to 2.3%) compared with previous study. 5) In the 30 patients treated with Scolopendrid aquacupuncture, Renal function test(BUN, Cr) and abnormal rate(from 2.5% to 2.0%) showed a slight decrease on the contrary. 6) In the 30 patients treated with Scolopendrid aquacupuncture. Electrolyte were normal range before & after treatment. 7) In the results of the Urine analysis of 30 patients, Leukocyte, Protein. Glucose, Keton, Bilirubin, U-bilinogen were not detected before and after Scolopendrid aquacupuncture treatment, and the rest almost made no difference. 8) In the Physical reactions, all of the patients complained of pain of body partially, only one patient showed reddish and itch, but symptoms like those were entirely disappeared within 24 hours and whole body pain, swelling, headache, dizziness, fatigue and nausea was not observed.

Effect of Intraoperative Mitomycin C on the Surgical Outcomes of Ahmed Glaucoma Valve Implantation with Ciliary Sulcus Tube Placement

Na Eun Kim(Na Eun Kim),Sung Sik Kim(Sung Sik Kim),Jihei Sara Lee(Jihei Sara Lee ),Kwanghyun Lee(Kwanghyun Lee),Hyoung Won Bae(Hyoung Won Bae),Sang Yeop Lee(Sang Yeop Lee),Wungrak Choi(Wungrak Choi),Ch 대한안과학회 2023 Korean Journal of Ophthalmology Vol.37 No.3

Purpose: To evaluate the effect of intraoperative mitomycin C (MMC) on the surgical outcomes of ciliary sulcus (CS) Ahmed glaucoma valve (AGV) tube placement. Methods: A retrospective review of medical records of 54 consecutive patients who underwent AGV implantation with tube placed in CS was performed. Consecutive cases operated without the use of intraoperative MMC from 2017 to 2019 were compared with consecutive cases operated with MMC from 2019 to 2021. Surgical failure was defined as intraocular pressure (IOP) exceeding 21 mmHg in two consecutive visits after postoperative 3 months or ≤30% IOP reduction, IOP ≤5 mmHg in two consecutive visits, or loss of light perception. Kaplan-Meier survival analysis and log-rank test were performed to compare the surgical failure rates. Results: A total of 54 eyes of 54 patients were investigated. Mean follow-up period after AGV implantation was 1.4 ± 0.8 years. The MMC group showed significantly lower IOP during the 1st postoperative month (20.5 ± 8.6 mmHg vs. 15.8 ± 6.4 mmHg, p = 0.027), but the difference did not persist 6 months after the surgery (p = 0.805). The mean number of postoperative antiglaucoma medications was significantly lower in the MMC group in the 1st postoperative month (p = 0.047) but no difference was found at 6 months. No statistical difference was noted in the rates of postoperative complications. Kaplan- Meier survival analysis showed comparable survival rates between MMC group and no MMC group (p = 0.356). Conclusions: The intraoperative use of MMC significantly lowered IOP in the 1st postoperative month but did not increase 6 months success rates in patients receiving AGV tube placement in CS.

Effect of biochemical and biomechanical factors on vascularization of kidney organoid-on-a-chip

Lee Han Na,Choi Yoon Young,Kim Jin Won,Lee Young Seo,최지욱,Kang Taewook,Kim Yong Kyun,Chung Bong Guen 나노기술연구협의회 2021 Nano Convergence Vol.8 No.35

Kidney organoids derived from the human pluripotent stem cells (hPSCs) recapitulating human kidney are the attractive tool for kidney regeneration, disease modeling, and drug screening. However, the kidney organoids cultured by static conditions have the limited vascular networks and immature nephron-like structures unlike human kidney. Here, we developed a kidney organoid-on-a-chip system providing fluidic flow mimicking shear stress with optimized extracellular matrix (ECM) conditions. We demonstrated that the kidney organoids cultured in our microfluidic system showed more matured podocytes and vascular structures as compared to the static culture condition. Additionally, the kidney organoids cultured in microfluidic systems showed higher sensitivity to nephrotoxic drugs as compared with those cultured in static conditions. We also demonstrated that the physiological flow played an important role in maintaining a number of physiological functions of kidney organoids. Therefore, our kidney organoid-on-a-chip system could provide an organoid culture platform for in vitro vascularization in formation of functional three-dimensional (3D) tissues.

Huge Perirenal Hematoma which Caused Renal Dysfunction after Percutaneous Needle Biopsy in Transplanted Kidney

( Won Ik Jang ),( Hyun Jun Ju ),( Dae Eun Choi ),( Ki Ryang Na ),( Kang Wook Lee ),( Young Tai Shin ) 대한내과학회 2011 대한내과학회 추계학술발표논문집 Vol.2011 No.1

Introduction: Percutaneous biopsy of the kidney is a standard procedure to evaluate renal parenchymal disease in native kidneys and in renal transplants. The percutaneous approach using real-time ultrasound guidance and automated biopsy device is the standard method of obtaining tissue in patients without complications. This procedure remains safe with a few risks to the patients and provides adequate tissue for diagnosis in at least 95% of cases. However, serious complications, although rare, may occur in 2.7% of the patients and the majority of these are related to bleeding. We report a case of huge perirenal hematoma with renal dysfunction after percutaneous needle renal biopsy in transplanted kidney. Case: A 63-year old man presented with fever, chill, rhinorrhea from 3 days ago. He underwent a kidney transplant operation donated from his wife last year. He had been on regular hemodialysis for 3 years due to hypertensive ESRD.He was diagnosed upper respiratory tract infection and had been taken conservative management. Ultrasound sonograghy revealed no structural abnormality in transplanted kidney. The CBC showed WBC 13,270 /uL,Hb13.5 g/dl, platelet 135,000 cells/uL. The coagulation profile was normal. The blood chemistry revealed a serum creatinine level of 3.0 mg/dL from 1.1 mg/dL last 1 month. His urine output was good. He was performed a percutaneous ultrasound-guided allograft renal biopsy on the 3rd day in hospital. We had used 16G automated gun needle and gotten 5 pieces of tissue. The histologic diagnosis was acute rejection type IA. On 4 days after biopsy, his serum creatinine elevated up to 8.2 mg/dL and his urine output decreased to 300 ml/day. Abdominal computed tomography angiography showed a 8.5 X 2.8 cm hematoma at lateral aspect of transplanted kidney. Tc-99m DTPA Renal Perfusion &Renogram showed marked decreased perfusion and excretion in transplanted kidney. We intended radiologic intervention of drainage catheter insertion to perirenal hematoma, but the procedure failed. He performed acute hemodialysis two days. His serum creatinine decreased to 1.7 mg/dL and urine output increased to 2,700 ml/day after 5 days from acute hemodialysis. On the 22nd day in hospital, He was discharged.

Pre-validation study of alternative developmental toxicity test using mouse embryonic stem cell-derived embryoid bodies

Lee, Jae-Hwan,Park, Seon Young,Ahn, Changhwan,Kim, Cho-Won,Kim, Ji-eun,Jo, Na Rae,Kang, Hee Young,Yoo, Yeong-Min,Jung, Eui-Man,Kim, Eun Mi,Kim, Ki-Suk,Choi, Kyung-Chul,Lee, Sung Duck,Jeung, Eui-Bae Elsevier 2019 Food and chemical toxicology Vol.123 No.-

<P><B>Abstract</B></P> <P>The embryoid body test (EBT) is a developmental toxicity test method that assesses the half inhibitory concentrations of substances in the area of embryoid bodies (EBs), and in the viability of mouse embryonic stem cells (ESCs) and fibroblasts (3T3 cells) following chemical exposure for three and four days, respectively. In the previous study, the EBT showed more advanced than the embryonic stem cell test (EST) from the European Centre for the Validation of Alternative Methods (ECVAM) applying cardiac differentiation of mouse ESCs, because the EBT greatly reduced the exposure time, labor, and amount of materials required, and misclassification of embryotoxic potential. This pre-validation study evaluated the predictive accuracy of the EBT using 26 coded test substances by two steps: intra-laboratory and inter-laboratory reproducibility tests. Since some substances have different embryotoxic potentials at different pregnancy periods, in this study, a new prediction model consisting of non-toxic and toxic classes was used, instead of the existing prediction model assessing embryotoxicants in four classes. The results of the intra- and inter-laboratory tests were highly accurate (above 80%) when substances were classified using the predictive model. In conclusion, EBT can accurately classify various embryotoxicants in a short time with less effort and greater validation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The experiment was conducted to verify the embryo body test (EBT) method. </LI> <LI> Predictive models were created for two classifications (non-toxic and toxic). </LI> <LI> Experimental results showed high accuracy (above 80%). </LI> <LI> EBT can be used to classify embryotoxicants in the short term. </LI> </UL> </P>