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( Aftabuzzaman ),( Yong-il Cho ) 한국동물위생학회 2021 한국동물위생학회지 (KOJVS) Vol.44 No.2
Caseous lymphadenitis, caused by Corynebacterium pseudotuberculosis has been a predominant disease among small ruminants on farms, causing significant losses for farm producer in the larger part of goat rearing nations across the world, for over a century. However, the control measures have not been very effective due to the chronic and usually subclinical nature of the infection. This has caused significant financial losses due to chronic ill-thrift, carcass condemnation, decreased meat yields and low reproduction as well as animal welfare. The current status of caseous lymphadenitis, with updated reseach information to the etiology, pathogenesis, clinical signs, identification, prevalence, prevention and vaccination are delineated in the review.
Aftabuzzaman, M.,Kim, Chang Ki,Kowalewski, Tomasz,Matyjaszewski, Krzysztof,Kim, Hwan Kyu Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.35
<P>To date, the facile preparation of ruthenium nanoparticles homogeneously dispersed in mesoporous carbons remains a big challenge. Here, a poly(butyl acrylate)-<I>b</I>-polyacrylonitrile block copolymer was dissolved in dimethyl sulfoxide with ruthenium(iii) acetylacetonate (Ru(acac)3) and then pyrolyzed after electrospinning. Ru(acac)3 was confined in the polymer network and converted to RuO2, which was further reduced to Ru nanoparticles (Ru-NPs) at high temperature, eventually producing well-dispersed Ru-NPs embedded in STMCs (Ru-NPs@STMCs). The as-prepared Ru-NPs@STMCs show many attractive features, such as spherical shape with a high surface area, numerous active species (Ru and N), and an interconnected structure with meso/micropores, resulting in fast mass transport and ion diffusion pathways. The synergetic effect of Ru-NPs and STMCs gives rise to excellent electrochemical performance, with a very high specific gravimetric capacitance of 656.25 F g<SUP>−1</SUP> at a scan rate of 10 mV s<SUP>−1</SUP>, good rate capability, and excellent long-term cycling stability (almost 100% retention after 5000 cycles). To our knowledge, this performance is one of the best results reported for Ru/carbon-based materials and is comparable to that of other RuO2/carbon-based materials. This study not only gives insights into the design and construction of novel nanocomposites for high-performance supercapacitors but also provides a new approach to engineering metal/carbon composites applicable to energy storage and energy conversion devices.</P>
( Md. Aftabuzzaman ),( Hector Espiritu ),( Seon-ho Kim ),( Lovelia Mamuad ),( Su-jeong Jin ),( Sang-suk Lee ),( Yong-il Cho ) 한국동물위생학회 2021 한국동물위생학회지 (KOJVS) Vol.44 No.4
The study characterized Trueperella pyogenes (T. pyogenes) from caseous lymphadenitis (CLA) in Korean native goats (KNG). CLA samples (n=191) were obtained from abattoir-slaughtered KNG. Pus were obtained and Corynebacterium pseudotuberculosis was detected by PCR using PLD gene. Three PLD-negative samples (1.57%) from supramammary lymph node were subjected to bacterial culture. Isolates were identified using 16S rRNA and biochemically characterized by APIZYM. Phylogenetic and biochemical analyses identified the isolates as T. pyogenes, and have shown separate clusters and varied enzyme reaction, suggesting genotypic and phenotypic diversity. This first report of T. pyogenes -induced CLA in KNG provided information for further investigations.
Mohammad Aftabuzzaman,김환규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this study, Ru-doped nanostructured carbons (Ru-NCs) were prepared by direct stabilization and carbonization of poly(butyl acrylate)-b-polyacrylonitrile (PBA-b-PAN) block copolymer and Ru(acac)<sub>3</sub>, where PAN acts as semi-graphitic carbon source and PBA act as porous template. The resulting Ru-NCs shows ultra-low charge transfer resistance (R<sub>ct</sub> = 0.034 Ω cm<sup>2</sup>) in cobalt(bpy)<sub>3</sub><sup>3+/2+</sup> reduction reaction, indicating very high electro-catalytic ability. Even though a transparent CE, covering small fraction of FTO substrate with Ru-NCs shows lower charge transfer resistance (R<sub>ct</sub> = 0.55 Ω cm<sup>2</sup>) compared to Pt (R<sub>ct</sub> = 1.00 Ω cm<sup>2</sup>). The Ru-NCs CE exhibited superior power conversion efficiency (11.67%) to the Pt CE (11.49%), when employed in SGT-021/cobalt (bpy)<sub>3</sub><sup>3+/2+</sup>-based DSSC. Furthermore, a remarkable power conversion efficiency of 10.13% and 8.64% from front and rear illumination, respectively, were obtained when Ru-NCs CEs employed in a bifacial DSSC.
Mohammad Aftabuzzaman,김환규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We have fabricated a three-dimensional hierarchical porous carbon (3D-HPC) substrate from poly(butyl acrylate)-b-polyacrylonitrile (PBA-b-PAN) block-copolymer, which contain interconnected mesopores/micropores and N-heteroatom. This distinct feature helps to disperse Pt single atom uniformly all over the matrix. The as-prepared Pt-single atom at 3D-HPC (Pt1-3D-HPC) displays exceptional catalytic properties towards oxygen and tri-iodide reduction reaction. The Pt1-3D-HPC electrode exhibit low charge transfer resistance and enhanced power conversion efficiency as counter electrode compared to reference electrode (Pt). Also, Pt1-3D-HPC electrode exhibit the improved catalytic perfotmance towards oxygen reduction reaction, with higher Eonset (1.11 V), E1/2 (0.89 V) and diffusion limiting current compared to reference 20% Pt/C electrode (Eonset,1.05 V and E1/2, 0.89 V).