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Use of various MgO resources for high-purity Mg metal production through molten salt electrolysis and vacuum distillation

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Journal of Magnesium and Alloys 2023年第2期11卷 562-579页

作者： Hyeong-Jun Jeoung Tae-Hyuk Lee youngjae kim jin-young Lee young Min kim Toru HOkabe kyung-Woo Yi Jungshin kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132South Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113South Korea Korea Institute of Materials Science 797 Changwondae-roSeongsan-guChangwonGyeongnam 51508South Korea Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 44241South Korea

A green and effective electrolytic process was developed to produce high-purity Mg metal using primary and secondary resources containing Mg O as a feedstock. The electrolysis of various Mg O resources was conducted using a Cu cathode in MgF2– LiF – KCl molten salt at 1043 K by applying an average current of 1.44 A for 12.5 h. The electrolysis of calcined North Korean magnesite and seawater Mg O clinker yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 89.6–92.4%. The electrolysis of oxidized Mg O-C refractory brick, aged ferronickel slag, and ferronickel slag yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 59.3–92.3%. The vacuum distillation of Mg alloys obtained was conducted at 1300 K for 10 h to produce high-purity Mg metal. After vacuum distillation, Mg metal with a purity of above 99.994% was obtained. Therefore, this study demonstrates the feasibility of the production of high-purity Mg metal from various Mg O resources using a novel electrolytic process with a Cu cathode, followed by vacuum distillation.

关键词： High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation

Production of high-purity Mg metal from dolomite through novel molten salt electrolysis and vacuum distillation

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Journal of Magnesium and Alloys 2023年第4期11卷 1308-1320页

作者： Hyeong-Jun Jeoung Tae-Hyuk Lee jin-young Lee kyung-Woo Yi Jungshin kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132Republic of Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113Republic of Korea School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 46241Republic of Korea

In this study,a novel Mg production process for producing high-purity Mg metal from dolomite was *** the electrolysis of calcined dolomite was conducted using Cu cathode and C anode in MgF_(2)–LiF molten salt at 1083–1173 K by applying an average current of 1.42–1.46 A for 9.50–21.0 h,the current efficiency of 66.4–88.6%was *** produced Mg alloys consisted of MgCu_(2)and Cu(Mg)or MgCu_(2)and CuMg_(2)phases,depending on the Mg concentration in the Mg *** the electrolysis of calcined dolomite was conducted in MgF_(2)–LiF–CaF_(2)molten salt at 1083 K,the current efficiency was 40.9–71.4%,owing to undesired reactions such as electroreduction of Ca^(2+)or/and CO_(3)^(2−)***,the current efficiency increased from 40.9%to 63.2%by utilizing a Pt anode,because the occurrence of CO_(3)^(2−)ions in the molten salt was *** vacuum distillation of the obtained Mg alloys at 1300 K for 10 h,Mg metal with a purity of 99.9996–99.9998%was ***,the feasibility of this novel process for the production of high-purity Mg metal from dolomite was demonstrated.

关键词： High-purity magnesium Dolomite Magnesium oxide Electrolytic process Copper metal cathode Vacuum distillation

Migration routes and differences in migration strategies of Whooper Swans between spring and autumn

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Avian Research 2023年第3期14卷 345-353页

作者： Ji-Yeon Lee hyung-Kyu Nam jin-young Park Seung-Gu kang Nyambayar Batbayar Dong-won kim Jae-Woong Hwang Otgonbayar Tsend Tseveenmyadag Natsagdorj Jugdernamjil Nergui Tuvshintugs Sukhbaatar Wee-Haeng Hur Jeong-Chil Yoo The Korea Institute of Ornithology and Department of Biology Graduate SchoolKyung Hee University26 Kyungheedae-roDongdaemun-guSeoul02447Republic of Korea National Institute of Biological Resources 42 Hwangyeong-roSeo-guIncheon22689Republic of Korea Endangered Species Research Center National Institute of EcologyYeongyang36351Republic of Korea Wildlife Sciences and Conservation Center of Mongolia Union BuildingB-701UNESCO str.Ulaanbaatar14210Mongolia

Long-distance migratory birds travel more rapidly in spring than in autumn,as they face temporal breeding ***,several species travel slower in spring owing to environmental influences,such as food availability and wind *** trackers were attached to 17 Whooper Swans(Cygnus cygnus) inhabiting northeastern Mongolia,to determine their migration routes and stopover sites in spring and *** between spring and autumn migrations,migration-influencing parameters,and the effect of spring stopover site temperatures were *** swans completed perfect tours between their wintering and breeding sites,and these data were used for *** migration lasted 57 days,with 49.2 days spent at 3.7 stopover *** migration lasted 21.5 days,with 17.5 days spent at 1.0 stopover ***,the swans traveled more rapidly in autumn than in *** distance,number of stopovers,migration speed,and straightness were important migration determinants in both spring and *** distance,stopover duration,number of stopovers,daily travel speed,travel duration,and migration speed differed significantly between spring and *** spring migration,the temperature at the current stopover sites and that at the future stopover sites displayed significant variations(t=1585.8,df=631.6,p <0.001).These findings are critical for the conservation and management of Whooper Swans and their key habitats in East Asian regions,and the data are anticipated to make a particularly significant contribution toward developing detailed management plans for the conservation of their key habitats.

关键词： Key stopover sites Migration characteristics Migration route Migration strategy Tracking Whooper Swan

Prognostic value of 18-fluorodeoxyglucose positron emission tomography-computed tomography in resectable colorectal cancer

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World Journal of Gastroenterology 2012年第36期18卷 5072-5077页

作者： Jang Eun Lee Sang Woo kim jin Su kim Kyu Yong Choi won kyung kang seong taek oh Ie Ryung Yoo Sung Hoon kim Department of Internal Medicine Seoul St.Mary's HospitalCollege of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea Department of Surgery College of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea Department of Radiology Seoul St.Mary's HospitalCollege of MedicineThe Catholic University of South KoreaSeoul 137-701South Korea

AIM:To assess the prognostic value of preoperative 18 fluorodeoxyglucose positron emission tomography(FDG-PET)/computed tomography(CT) in patients with resectable colorectal ***:One hundred sixty-three patients with resectable colorectal cancer who underwent FDG-PET/CT before surgery were *** data including pathologic stage at presentation,histology,treatment,disease-free survival and the maximum standardized uptake value(SUVmax) of the primary tumor on FDG-PET/CT were retrospectively *** follow up duration was 756(range,419-1355).The primary end point was disease-free ***:Twenty-five of 163 patients(15.3%) had *** median SUVmax values of the recurrence and no-recurrence groups were 8.9(range,5-24) and 8.2(range,0-23,P = 0.998).Receiver operating characteristic(ROC) curve analysis showed no significant association between SUVmax and recurrence(area under the curve = 0.5,P = 0.998,95% CI:0.389-0.611).Because a statistically significant value was not found,SUVmax was dichotomized at its median of *** disease-free survival curve was analyzed using the median SUVmax(8.6) as the cut *** and multivariate analysis did not provide evidence that disease-free survival rates for the subgroups defined by the median SUVmax were significantly different(P = 0.52,P = 0.25).CONCLUSION:Our study suggests that the high FDG uptake of primary mass in resectable colorectal cancer doesn't have a significant relationship with tumor recurrence and disease-free survival.

关键词：正电子发射断层扫描脱氧葡萄糖手术切除大肠癌价值计算机断层扫描电脑预后

Expression of a High Mobility Group Protein Isolated from Cucumis sativus Affects the Germination of Arabidopsis thaliana under Abiotic Stress Conditions

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Journal of Integrative Plant Biology 2008年第5期50卷 593-600页

作者： Ji young Jang kyung jin Kwak Hunseung kang Department of Plant Biotechnology Agricultural Plant Stress Research Center and Biotechnology Research InstituteCollege of Agriculture and Life SciencesChonnam National UniversityGwangju 500-757Korea

Although high mobility group B （HMGB） proteins have been identified from a variety of plant species, their importance and functional roles in plant responses to changing environmental conditions are largely unknown. Here, we investigated the functional roles of a CsHMGB isolated from cucumber （Cucumis sativus L.） in plant responses to environmental stimuli. Under normal growth conditions or when subjected to cold stress, no differences in plant growth were found between the wild-type and transgenic Arabidopsis thaliana overexpressing CsHMGB. By contrast, the transgenic Arabidopsis plants displayed retarded germination compared with the wild-type plants when grown under high salt or dehydration stress conditions. Germination of the transgenic plants was delayed by the addition of abscisic acid （ABA）, implying that CsHMGB affects germination through an ABA-dependent way. The expression of CsHMGB had affected only the germination stage, and CsHMGB did not affect the seedling growth of the transgenic plants under the stress conditions. The transcript levels of several germination-responsive genes were modulated by the expression of CsHMGB in Arabidopsis. Taken together, these results suggest that ectopic expression of a CsHMGB in Arabidopsis modulates the expression of several germinationresponsive genes, and thereby affects the germination of Arabidopsis plants under different stress conditions.

关键词： abiotic stress cucumber Cucumis sativus high mobility group protein transgenic Arabidopsis plant.

Treatment of pediatric average-risk medulloblastoma using craniospinal irradiation less than 2500 cGy and chemotherapy: single center experience in Korea

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World Journal of Pediatrics 2017年第4期13卷 367-373页

作者： Jong hyung Yoon kyung Duk Park hyoung jin kang Hyery kim Ji won Lee Seung-Ki kim Kyu-Chang Wang Sung-Hye Park Il Han kim Hee young Shin Department of Pediatrics Cancer Research InstituteSeoul National University College of MedicineSeoul Department of Pediatrics Hallym University College of medicineChuncheon Sacred Heart HospitalChuncheonKorea Departments of Neurosurgery Seoul National University College of MedicineSeoul Pathology Seoul National University College of MedicineSeoul Radiation Oncology Seoul National University College of MedicineSeoul

Background:Although craniospinal irradiation (CSI) of 2340 cGy plus tumor booster with chemotherapy have been established as a standard treatment of childhood average-risk (AvR) medulloblastoma (MBL) in Western counties,there are a few recent reports in outcomes ofAvR MBL using this strategy in Korean and other Asian *** investigated the outcome of the Korean children with AvR MBL who were treated with CSI <2500 cGy and ***:Between January 2001 and December 2010,clinical characteristics and outcomes of 42 patients who were diagnosed with AvR MBL postoperatively and treated with radiation including CSI <2500 cGy and chemotherapy in Seoul National University Children's Hospital were ***:Their median age was 9 years (range:3-18.8),and 29 were *** subtypes were classic type in 28 patients,nodular/desmoplastic in 7,and large cell/anaplastic (LCA) in *** the patients received adjuvant radiotherapy (CSI with median 2340 cGy and booster) and multiagent chemotherapy as the first-fine *** a median follow-up of 54 months,12 patients experienced relapse or progression of the *** 3-and 5-year disease-free survival (DFS) rates were 78.0%±6.5% and 75.0%±6.9%,respectively,and overall survival (OS) rates were 85.3%±5.6% and 76.8%±6.9%,*** LCA subtype was associated with poorer DFS (P=0.023) and OS (P=0.008),compared with non-LCA ***:The outcomes of children and adolescents with AvR MBL treated with radiation including CSI <2500 cGy and chemotherapy,are compatible to those in Western countries;however,the LCA subtype has a poor outcome with this strategy.

关键词： average-risk craniospinal irradiation medulloblastoma

Compatible taper and stem volume equations for Larix kaempferi(Japanese larch) species of South Korea

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Journal of Mountain Science 2017年第7期14卷 1341-1349页

作者： Nova D.DOYOG young jin LEE Sun Joo LEE jin taek kang Sung Yong kim Department of Forest Resources College of Industrial Science Kongju National University National Institute of Forest Science

In this study, compatible taper and stem volume equations were developed for Larix kaempferi species of South Korea. The dataset was split into two groups: 80% of the data were used in model fitting and the remaining 20% were used for validation. The compatible MB76 equations were used to predict the diameter outside bark to a specific height, the height to a specific diameter and the stem volume of the species. The result of the stem volume analysis was compared with the existing stem volume model of Larix kaempferi species of South Korea which was developed by the Korea Forest Research Institute and with a simple volume model that was developed with fitting dataset in this study. The compatible model provided accurate prediction of the total stem volume when compared to the existing stem volume model and with a simple volume model. It is concluded that the compatible taper and stem volume equations are more convenient to use and therefore it is recommended to be applied in the Larix kaempferi species of South Korea.

关键词：日本落叶松材积方程韩国兼容锥度体积模型品种模型拟合

Actinomycosis of the appendix mimicking appendiceal tumor:A case report

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World Journal of Gastroenterology 2010年第3期16卷 395-397页

作者： Sang-Yun Lee Hee-jin Kwon jin-Han Cho Jong-young oh kyung-jin Nam jin-Hwa Lee seong-Kuk Yoon Myong-jin kang jin-Sook Jeong Department of Radiology Dong-A University Hospital Department of Pathology Dong-A University Hospital

Actinomycosis is an uncommon chronic infectious disease. Common sites of involvement include the cervicofacial, thoracic and abdominopelvic regions. In abdominopelvic actinomycosis, the ileocecal region, including the appendix, is the most commonly involved site. In some reports, limited appendiceal actinomycosis has revealed a thickened appendiceal wall with peri-appendiceal inflammation as acute appendicitis or perforated appendicitis. We experienced pathologically confirmed intraluminal limited appendiceal actinomycosis without peri-appendiceal infiltration. Here, we report the computed tomography and ultrasound findings.

关键词： Actinomyces Actinomycosis Appendiceal neoplasms Appendicitis

Randomized controlled trial to evaluate the efficacy and safety of fexuprazan compared with esomeprazole in erosive esophagitis

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World Journal of Gastroenterology 2022年第44期28卷 6294-6309页

作者： kang Nyeong Lee oh young Lee Hoon Jai Chun jin Il kim Sung Kook kim Sang Woo Lee kyung Sik Park Kook Lae Lee Suck Chei Choi Jae-young Jang Gwang Ha kim In-kyung Sung Moo In Park Joong Goo Kwon Nayoung kim Jae Jun kim Soo Teik Lee Hyun Soo kim Ki Bae kim Yong Chan Lee Myung-Gyu Choi Joon seong Lee Hwoon-Yong Jung Kwang Jae Lee Jie-Hyun kim Hyunsoo Chung Department of Internal Medicine Hanyang University College of MedicineSeoul 04763South Korea Department of Internal Medicine Korea University Anam HospitalSeoul 02841South Korea Department of Internal Medicine The Catholic University of KoreaYeouido ST.Mary’s HospitalSeoul 07260South Korea Department of Internal Medicine Kyungpook National University HospitalDaegu 41944South Korea Department of Internal Medicine Korea University Ansan HospitalAnsan-si 15355South Korea Department of Internal Medicine Keimyung University Dongsan HospitalDaegu 42601South Korea Department of Internal Medicine Seoul Metropolitan Government Seoul National University Boramae Medical CenterSeoul 07061South Korea Department of Internal Medicine Wonkwang University HospitalIksan 54538South Korea Department of Internal Medicine KyungHee University Medical CenterSeoul 02447South Korea Department of Internal Medicine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University HospitalBusan 47241South Korea Department of Internal Medicine KKonkuk University Medical CenterSeoul 05030South Korea Department of Internal Medicine Kosin University Gaspel HospitalBusan 49267South Korea Department of Internal Medicine Daegu Catholic University Medical CenterDaegu 42471South Korea Department of Internal Medicine Seoul National University Bundang HospitalSeongnam-si 13620Gyeonggi-doSouth Korea Department of Internal Medicine Samsung Medical CenterSeoul 06351South Korea Department of Internal Medicine Chonbuk National University HospitalJeonju-si 54907South Korea Department of Internal Medicine Chonnam National University HospitalGwangju 61469South Korea Department of Internal medicine Chungbuk National University School of MedicineCheong Ju 28644South Korea Department of Internal Medicine Severance HospitalSeoul 03722South Korea Department of Internal Medicine The Catholic University of KoreaSeoul ST.Mary’s HospitalSeoul 06591South Korea Digestive Disease Center Soon

BACKGROUND Fexuprazan,a novel potassium-competitive acid blocker,reversibly suppresses the K+/H+-ATPase enzyme in proton pumps within gastric parietal ***’s suppression of gastric acid was maintained in healthy individuals for 24 h in a dose-dependent *** To compare fexuprazan to esomeprazole and establish its efficacy and safety in patients with erosive esophagitis(EE).METHODS Korean adult patients with endoscopically confirmed EE were randomized 1:1 to receive fexuprazan 40 mg or esomeprazole 40 mg once daily for eight *** primary endpoint was the proportion of patients with healed EE confirmed by endoscopy at week *** secondary endpoints included the healing rate of EE at week 4,symptom response,and quality of life *** profiles and serum gastrin levels were compared between the *** Of the 263 randomized,218 completed the study per protocol(fexuprazan 40 mg,n=107;esomeprazole 40 mg,n=111).Fexuprazan was non-inferior to esomeprazole regarding the healing rate at week 8[99.1%(106/107)vs 99.1%(110/111)].There were no between-group differences in the EE healing rate at week 4[90.3%(93/103)vs 88.5%(92/104)],symptom responses,and quality of life ***,serum gastrin levels at weeks 4 and 8 and drug-related side effects did not significantly differ between the *** Fexuprazan 40 mg is non-inferior to esomeprazole 40 mg in EE healing at week *** suggest that fexuprazan is an alternative promising treatment option to PPIs for patients with EE.

关键词： Gastroesophageal reflux Esophagitis Proton pump inhibitors Heartburn Quality of life