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Enhancement of Au–Ag–Te contents in tellurium-bearing ore minerals via bioleaching

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 262-270页

作者： Nag-Choul choi Kang Hee Cho Bong Ju Kim soonjae Lee Cheon young Park Department of Rural Systems Engineering Seoul National University Department of Earth and Environmental Sciences Korea University Department of Energy and Resource Engineering Chosun University

The purpose of this study was to enhance the content of valuable metals, such as Au, Ag, and Te, in tellurium-bearing minerals via bioleaching. The ore samples composed of invisible Au and Au paragenesis minerals(such as pyrite, chalcopyrite, sphalerite and galena) in combination with tellurium-bearing minerals(hessite, sylvanite and Tellurobismuthite) were studied. Indigenous microbes from mine drainage were isolated and identified as Acidithiobacillus ferrooxidans, which were used in bioleaching after adaption to copper. The effect of the microbial adaption on the bioleaching performance was then compared with the results produced by the non-adaptive process. The microbial adaption enhanced the Au–Ag–Te contents in biological leaching of tellurium-bearing ore minerals. This suggests that bioleaching with adapted microbes can be used both as a pretreatment and in the main recovery processes of valuable metals.

关键词： tellurium-bearing mineral bioleaching adaptation Au–Ag–Te Acidithiobacillus ferrooxidans

Ultrasound-guided intra-articular corticosteroid injection in a patient with manubriosternal joint involvement of ankylosing spondylitis:A case report

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World Journal of Clinical Cases 2023年第9期11卷 2043-2050页

作者： Min-Hee choi In-young Yoon Won-Joong Kim Department of Anesthesiology and Pain Medicine Ewha Womans University Mokdong HospitalSeoul 07985South Korea

BACKGROUND Manubriosternal joint(MSJ)disease is a rare cause of anterior chest pain but can be a major sign of systemic arthritic *** patients with ankylosing spondylitis(AS),a type of systemic arthritis,chest pain can be due to MSJ involvement and can be improved by ultrasound-guided corticosteroid injection into the *** SUMMARY A 64-year-old man visited our pain clinic complaining of anterior chest *** were no abnormal findings on lateral sternum X-ray,but arthritic changes in the MSJ were observed on single-photon emission computed tomography-computed *** performed additional laboratory tests,and he was finally diagnosed with *** pain relief,we performed ultrasound-guided intra-articular(IA)corticosteroid injections into the *** the injections,his pain nearly *** For patients complaining of anterior chest pain,AS should be considered,and single-photon emission computed tomography-computed tomography can be helpful in *** addition,ultrasound-guided IA corticosteroid injections may be effective for pain relief.

关键词： Ankylosing spondylitis Anterior chest pain Manubriosternal joint Single-photon emission computed tomography-computed tomography Case report

Installing a molecular truss beam stabilizes MOF structures

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npj Computational Materials 2022年第1期8卷 1110-1118页

作者： Hong Ki Kim Jong-Yeong Jung Gyumin Kang Mu-Hyun Baik Eun-young choi Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Center for Catalytic Hydrocarbon Functionalizations Institute for Basic Science(IBS)Daejeon34141Republic of Korea Korea Science Academy of KAIST 105-47 Baegyanggwanmun-roBusanjin-guBusan47162Republic of Korea

Enhancing the stability and durability of metal-organic frameworks(MOFs)is vital for practical applications because many promising MOF materials suffer from phase transitions and/or structural decompositions with humidity being a particularly damaging *** mechanical engineering,the frame of buildings and furniture can be stabilized significantly by installing a truss *** the same principle,we functionalized the organic component of MOF-5 to contain a carbazole moiety that can act as a molecular truss beam by reaching across the corner and forming a stableπ–πinteraction with a phenyl group on the edge position of the *** structural support enhanced the stability of the MOF substantially,allowing the designed MOF to maintain compositional integrity under steam conditions at 90℃for~5 *** unmodified MOF-5 shows clear signs of structural collapse after~1 h.

关键词： beam moiety durability

MicroRNA miR-252-5p regulates the Notch signaling pathway by targeting Rab6 in Drosophila wing development

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Insect Science 2023年第5期30卷 1431-1444页

作者： Do-Hwan Lim Min-Seok choi Ji Won Jeon young Sik Lee School of Systems Biomedical Science Soongsil UniversitySeoulRepublic of Korea College of Life Sciences and Biotechnology Korea UniversitySeoulRepublic of Korea Institute of Animal Molecular Biotechnology Korea UniversitySeoulRepublic of Korea

The Notch signaling pathway plays a central role in the development of various ***,dysregulation of microRNAs(miRNAs),which are crucial regulators of gene expression,can disrupt signaling pathways at all stages of *** Notch signaling is involved in wing development in Drosophila,the mechanism underlying miRNA-based regulation of the Notch signaling pathway is ***,we report that loss of Drosophila miR-252 increases the size of adult wings,whereas the overexpression of miR-252 in specific compartments of larval wing discs leads to patterning defects in the adult *** miR-252 overexpression-induced wing phenotypes were caused by aberrant Notch signaling with intracellular accumulation of the full-length Notch receptor during development,which could be due to defects in intracellular Notch trafficking associated with its recycling to the plasma membrane and autophagy-mediated ***,we identified Rab6 as a direct target of miR-252-5p;Rab6 encodes a small Ras-like GTPase that regulates endosomal trafficking *** with this finding,RNAi-mediated downregulation of Rab6 led to similar defects in both wing patterning and Notch ***,co-overexpression of Rab6 completely rescued the wing phenotype associated with miR-252 overexpression,further supporting that Rab6 is a biologically relevant target of miR-252-5p in the context of wing ***,our data indicate that the miR-252-5p-Rab6 regulatory axis is involved in Drosophila wing development by controlling the Notch signaling pathway.

关键词： Drosophila miR-252-5p Notch signaling Rab6 wing development

Estimation of deformed laser heat sources and thermal analysis on laser assisted turning of square member

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Journal of Central South University 2012年第2期19卷 402-407页

作者： KIM Jae-hyun KIM Kwang-sun choi Jun-young LEE Choon-man Department of Mechanical Design and Manufacturing Engineering Changwon National University

Laser assisted machining （LAM） has difficulties in estimating temperature after applying a LAM process due to its very small heat input area, large energy and movement. In particular, in the case of laser assisted turning （LAT） process, it is more difficult to estimate the temperature after preheating because it has a shape of ellipse when a laser heat source is rotated. A prediction method and thermal analysis method for heat source shapes were proposed as a square shaped member was preheated. The temperature distribution was calculated according to the rotation of the member. Compared with the results of the former study, the maximum temperature of the calculation results, 1 407.1 ℃, is 8.5 ℃ higher than that of the square member, which is 1 398.6 ℃. In a LAT process for a square member, the maximum temperature is 1 850.8 ℃. It is recognized that a laser power control process is required because square members show a maximum temperature that exceeds a melting temperature at around a vertex of the member according to the rotation.

关键词： laser assisted machining laser assisted turning laser preheating laser power control

Uncertainty analysis of flow rate measurement for multiphase flow using CFD

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Acta Mechanica Sinica 2015年第5期31卷 698-707页

作者： Joon-Hyung Kim Uk-Hee Jung Sung Kim Joon-Yong Yoon young-Seok choi Department of Mechanical Design Engineering Hanyang University Thermal & Fluid System R&BD Group Korea Institute of Industrial Technology Energy System Engineering University of Science and Technology

The venturi meter has an advantage in its use,because it can measure flow without being much affected by the type of the measured fluid or flow ***,it has excellent versatility and is being widely applied in many *** flow of a liquid containing air is a representative example of a multiphase flow and exhibits complex flow *** particular,the greater the gas volume fraction（GVF）,the more inhomogeneous the flow *** a result,using a venturi meter to measure the rate of a flow that has a high GVF generates an *** this study,the cause of the error occurred in measuring the flow rate for the multiphase flow when using the venturi meter for analysis by *** ensure the reliability of this study,the accuracy of the multiphase flow models for numerical analysis was verified through comparison between the calculated results of numerical analysis and the experimental *** a result,the Grace model,which is a multiphase flow model established by an experiment with water and air,was confirmed to have the highest ***,the characteristics of the internal flow Held about the multiphase flow analysis result generated by applying the Grace model were analyzed to find the cause of the uncertainty occurring when measuring the flow rate of the multiphase flow using the venturi meter.A phase separation phenomenon occurred due to a density difference of water and air inside the venturi,and flow inhomogeneity happened according to the flow velocity difference of each *** was confirmed that this flow inhomogeneity increased as the GVF increased due to the uncertainty of the flow measurement.

关键词： Multiphase flow Measurement Numerical analysis Venturi meter Gas volume fraction(GVF) Uncertainty Multiphase flow model Grace model

Intermittent, low-dose, antiandrogen monotherapy as an alternative therapeutic option for patients with positive surgical margins after radical prostatectomy

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Asian Journal of Andrology 2018年第3期20卷 270-275页

作者： Kyung Hwa choi Seung Ryeol Lee young Kwon Hong Dong Soo Park Department Urology CHA Bundang Medical Center CHA University Seongnam Korea.

The aim of the present study was to determine whether oncologic outcomes and adverse events associated with active on/off intermittent antiandrogen monotherapy （daily bicalutamide, 50 mg per day） are comparable with those of standard external beam radiation therapy （EBRT） or combined androgen blockade （CAB） therapy in prostate cancers with positive surgical margins after radical prostatectomy. Two hundred twenty-three patients with positive surgical margins post-radical prostatectomy who underwent active surveillance （AS, n = 32）, EBRT without hormone therapy （n = 55）, intermittent antiandrogen monotherapy without EBRT （IAAM, n= 50）, or CAB without EBRT （n = 86）, between 2007 and 2014, were reviewed retrospectively. Pathologic outcomes, biochemical recurrence rates, radiological disease progression, and adverse events were collected from medical records. Biochemical recurrence rates, biochemical recurrence-free survival rates, and radiological recurrence were not different between the groups （P = 0.225, 0.896, and 0.284, respectively）. Adverse event rates and severities were lower for IAAM compared with EBRT or CAB （both P 〈 0.05）, but were comparable to those for AS （P = 0.591 and 0.990, respectively）. Grade ：〉3 adverse events were not reported in the IAAM or AS groups. Erectile dysfunction and loss of libido rates were lower in the IAAM group compared with the EBRT and CAB groups （P = 0.032）. Gastrointestinal complications were more frequently reported in the EBRT group （P = 0.008）. Active on/off IAAM treatment might be an appropriate treatment option for patients with positive surgical margins after radical prostatectomy. Furthermore, regarding oncologic outcomes, IAAM was comparable to standard EBRT but had a milder adverse event profile.

关键词： androgen receptor antagonists disease progression margins of excision prostatectomy prostatic neoplasms

Stabilization of the Anatase Phase of Ti_(1-x)Sn_(x)O_(2) (x < 0.5) Nanofibers

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Nano Research 2010年第4期3卷 256-263页

作者： Kandasami Asokan Jae young Park Sunwoo choi Changhwan Chang Sang Sub Kim School of Materials Science and Engineering Inha UniversityIncheon 402-751Republic of Korea Inter-University Accelerator Centre Aruna Asaf Ali MargNew Delhi 110067India Department of Materials Test and Analysis Research Institute of Industrial Science and TechnologyPohang 790-600Republic of Korea

We experimentally investigate the stabilization of the anatase phase of Ti_(1-x)Sn_(x)O_(2)(x<0.5)nanofibers when synthesized by an electrospinning *** as-spun nanofibers became nano-grained,polycrystalline nanofibers after calcination and the diameters of the nanofibers depend on Sn *** of the anatase phase in Ti-rich compositions and incorporation of Sn ions were confirmed by X-ray diffraction,Raman,X-ray absorption near-edge structure,and photoluminescence(PL)*** from the PL study also demonstrated the tunable nature of the optical properties,with the emission maximum shifting towards higher wavelength with increasing Sn concentration.

关键词： Electrospinning nanofiber Ti_(1-x)Sn_(x)O_(2) X-ray absorption near-edge structure(XANES)

Dietary composition of birds in isolated ecosystems:a case study of Black Wood Pigeon in Republic of Korea

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Ecosystem Health and Sustainability 2020年第1期6卷 117-126,116页

作者： soon Kyoo choi Yung Chul Park Sung Wan Park Jae Woong Kim Woo Yuel Kim Division of Forest Science Kangwon National UniversityChuncheonRepublic of Korea Department of Biology Kyungpook National UniversityDaeguRepublic of Korea Earth Ecological Environment Research Institute DaejeonRepublic of Korea Division of National Ecosystem Survey Research NIESeocheonRepublic of Korea

We studied the feeding ecology of the Black Wood Pigeon(Columba janthina),a species endemic to the East Asian Pacific Islands,and determined the species’dietary composition and food preferences on Ulleung Island,South Korea,through field *** March 2016 to February 2018,the diversity of food items consumed was low,with the 10 most common plant species(from a total of 33)accounting for over 80%.Food availability varied depending on plant abundance,but this influence was minimized because of factors such as delayed fruit *** were the most favored food items(60-68%)but were replaced by nuts and weed seeds during the spring and winter *** composition and food preferences were related to the abundance of food items based on their phenology,but a steady,high preference for Aphananthe aspera was observed throughout the study *** abundance of Prunus takesimensis in June was correlated with changes in the Black Wood Pigeon *** study is the first to assess the feeding ecology of Black Wood Pigeons using field observations and suggests that the availability of different food items affects population changes on the East Asian Pacific islands.

关键词： Dietary composition feeding preference field observations fruit phenology seasonal variation