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Case report of a novel association between anti-p200 pemphigoid and acquired haemophilia A
Xuan Qi Koh,Kong Bing Tan,Enno Schmidt,Detlef Zillikens,Nisha Suyien Chandran 대한피부과학회 2023 Annals of Dermatology Vol.35 No.1
Anti-p200 pemphigoid is an uncommon subepidermal autoimmune bullous disease that,unlike many other autoimmune bullous diseases, has not previously been associated withhematological diseases. The diagnosis of anti-p200 pemphigoid in a patient with congruentclinical features requires the demonstration of subepidermal blistering, with linear depositionof immunoglobulin (Ig) G and/or C3 at the dermoepidermal junction on direct immunofluorescence,and a floor-binding pattern on indirect immunofluorescence. In addition,the detection of antibodies against p200 antigen via immunoblotting is ideal but not readilyaccessible in many facilities, leading to a potential under-recognition and under-diagnosisof this condition. In this case report, we describe a 53-year-old gentleman with recently diagnosedacquired hemophilia A who developed a concurrent vesiculobullous eruption andwas evaluated to have anti-p200 pemphigoid. Both of his conditions were controlled withimmunosuppression via prednisolone and cyclophosphamide. While we acknowledge thecontemporaneous occurrence of both diseases in this patient may be a mere coincidence, it isimportant to recognize the possibility of this association given the potential clinical significance. Whether the activity of one disease parallels the other will require further evaluation.
Acanthamoeba healyi: Expressed gene profiles with enhanced virulence after mouse-brain passage
Xuan, Y.H.,Hong, Y.C.,Lee, Y.S.,Kang, S.W.,Yu, H.S.,Ahn, T.I.,Chung, D.I.,Kong, H.H. Academic Press 2009 Experimental parasitology Vol.123 No.3
The virulence of Acanthamoeba can be attenuated by long-term in vitro cultivation, and can be recovered by serial mouse-brain passage via intranasal inoculation. Recovery is concomitant with changes in expression of virulence-related genes. To investigate the virulence factors of Acanthamoeba, expressed sequence tags (ESTs) from two kinds of cDNA libraries-long-term in vitro cultivated A. healyi (OLD) and three times mouse-brain passaged A. healyi (MBP)-were compared using reciprocal BLAST analysis, eukaryotic orthologous groups (KOG) assignment, and gene annotation. A total of 938 (OLD) and 1033 (MBP) ESTs were sequenced and resulted in the assembling of 718 OLD and 833 MBP unique sequences. Comparison of the KOG analysis revealed a relatively higher percentage of MBP ESTs in genes related to transcription (K group), amino acid transport and metabolism (E group), coenzyme transport and metabolism (H group), and secondary metabolites biosynthesis, transport and metabolism (Q group). However, a higher percentage of unidentified MBP ESTs (57.9%) than OLD ESTs (28.9%) was evidence of the limited understanding of virulence-related factors of Acanthamoeba. Characterization of the genes expressed during brain passage in mice will be useful in clarifying the pathogenesis of granulomatous amoebic encephalitis by Acanthamoeba.
Zhang, Feng-Jun,Kong, Cui,Li, Xuan,Sun, Xian-Yang,Xie, Wen-Jie,Oh, Won-Chun The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.3
Ternary MoS<sub>2</sub>/graphene (G)-TiO<sub>2</sub> photocatalysts were prepared by a simple hydrothermal method. The morphology, phase structure, band gap, and catalytic properties of the prepared samples were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, UV-vis spectrophotometry, and Brunauer-Emmett-Teller surface area measurement. The H<sub>2</sub> production efficiency of the prepared catalysts was tested in methanol-water mixture under visible light. MoS<sub>2</sub>/G-TiO<sub>2</sub> exhibited the highest activity for photocatalytic H<sub>2</sub> production. For 5 wt.% and 1 wt.% MoS<sub>2</sub> and graphene (5MT-1G), the production rate of H<sub>2</sub> was as high as 1989 µmol<sup>-1</sup>h<sup>-1</sup>. The catalyst 5MT-1G showed H<sub>2</sub> production activity that was ~ 11.3, 5.6, and 4.1 times higher than those of pure TiO<sub>2</sub>, 1GT, and 5MT, respectively. The unique structure and morphology of the MoS<sub>2</sub>/G-TiO<sub>2</sub> photocatalyst contributed to its improved hydrogen production efficiency under visible light.
Acoustic emission monitoring of damage progression in CFRP retrofitted RC beams
Nair, Archana,Cai, C.S.,Pan, Fang,Kong, Xuan Techno-Press 2014 Structural monitoring and maintenance Vol.1 No.1
The increased use of carbon fiber reinforced polymer (CFRP) in retrofitting reinforced concrete (RC) members has led to the need to develop non-destructive techniques that can monitor and characterize the unique damage mechanisms exhibited by such structural systems. This paper presented the damage characterization results of six CFRP retrofitted RC beam specimens tested in the laboratory and monitored using acoustic emission (AE). The focus of this study was to continuously monitor the change in AE parameters and analyze them both qualitatively and quantitatively, when brittle failure modes such as debonding occur in these beams. Although deterioration of structural integrity was traceable and can be quantified by monitoring the AE data, individual failure mode characteristics could not be identified due to the complexity of the system failure modes. In all, AE was an effective non-destructive monitoring tool that can trace the failure progression in RC beams retrofitted with CFRP. It would be advantageous to isolate signals originating from the CFRP and concrete, leading to a more clear understanding of the progression of the brittle damage mechanism involved in such a structural system. For practical applications, future studies should focus on spectral analysis of AE data from broadband sensors and automated pattern recognition tools to classify and better correlate AE parameters to failure modes observed.
Preparation and Properties of Green Environment-Friendly Drilling Polymer Mud
Zhang, Feng-Jun,Sun, Xian-Yang,Li, Xuan,Kong, Cui,Liu, Jin,Chen, Qian-Bao,Oh, Won-Chun Materials Research Society of Korea 2019 한국재료학회지 Vol.29 No.11
In this paper, a water-based green polymer mud is synthesized by simple compounding method. Effects of different kinds of tackifiers, their molecular weight on the viscosity of polymer mud and the effects of different fluid loss additives on mud fluid loss are studied. The results show that when polystyrene and anionic polyacrylamide with molecular weight of 8 ~ 10 million are used as the main thickening ingredient, polymer mud with high viscosity and high stability can be obtained. When the prepared polymer mud is formulated as NPAM: PEO: Hydroxypropyl cellulose(HPC) : Water = 42:10:10:100000 (unit: kg), the viscosity can reach 20.6 s, the filtration loss in 7.5 min is 24 mL, and the sand content is only 0.1 %. Compared with traditional bentonite mud, the green environment-friendly polymer mud has the advantages of small amount of waste, low environmental pollution, and low pulping cost, and can meet the construction needs for most topography and geomorphology drilling engineering.