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Ceria–zirconia mixed oxides: Synthetic methods and applications
Devaiah, Damma,Reddy, Lankela H.,Park, Sang-Eon,Reddy, Benjaram M. Taylor Francis 2018 Catalysis reviews: science and engineering Vol.60 No.2
<P>The primary objective of this review was to illustrate the significance of ceria-zirconia (CZ) mixed oxides as catalysts and catalyst supports as employed for a wide variety of catalytic applications both in the liquid and gaseous phases. In particular, we were interested in bringing together the recent literature pertaining to these mixed oxides with catalysis perspective. The most prominent application of CZ mixed oxides is in three-way catalysis (TWC) as oxygen storage and release material for several years by replacing cerium dioxide as it shows better efficiency and a high thermal stability. Doping with zirconium oxide, as it is alone a non-reducible oxide, makes the CZ mixed oxide a highly reactive, thermally stable, and more reducible with elevated oxygen storage capacity (OSC) that are important for TWC applications. Apart from the TWC use, the CZ mixed oxides have a huge number of applications, as a direct component or a support, ranging from water-gas shift reaction, reforming of hydrocarbons, dehydration of alcohols, CO2 utilization, catalytic combustion of pollutants, fine chemicals production, photocatalysis, and so on. All these applications are mainly dependent on three parameters of the mixed oxides, namely, OSC or redox nature, acid-base properties, and crystalline phases. Besides, most of the applications are influenced by the physical properties such as specific surface area, pore volume, pore diameter, crystallite size, and so on. In this review, many details pertaining to the synthesis of these mixed oxides by various conventional and non-conventional methods, their characterization by several techniques, and their application for various reactions of energy and environmental significance, as reported in the literature, are assessed.</P>
Damma Devaiah,Benjaram M. Reddy,Deshetti Jampaiah,Pranjal Saikia 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
A facile coprecipitation and deposition precipitation method were used for synthesis of nanosizedCe0.8Tb0.2O2-δ (CT) and Ce0.8Tb0.2O2-δ/TiO2 (CTT) solid solutions, respectively. The synthesized materialswere characterized by various state-of-the-art techniques and evaluated for CO oxidation activity. Formation of CT solid solution was confirmed by XRD and Raman, and nanocrystalline nature by TEM. Characterization results further suggested formation of a new pyrochlore phase between TiO2 and TbO2at 1073 K, and the presence of Ce3+ associated with lattice defects in all samples. Catalytic results showedthat CT calcined at 773 K exhibits a high activity and correlates well with physicochemicalcharacteristics.
Expression of esterase gene in yeast for organophosphates biodegradation
Kambiranda, Devaiah M.,Asraful-Islam, Shah Md.,Cho, Kye Man,Math, Renukaradhya K.,Lee, Young Han,Kim, Hoon,Yun, Han Dae Elsevier 2009 Pesticide biochemistry and physiology Vol.94 No.1
<P><B>Abstract</B></P><P>Organophosphates are esters of phosphoric acid and can be hydrolyzed and detoxified by carboxylesterase and phosphotriesterase. In this work esterase enzyme (Est5S) was expressed in yeast to demonstrate the organophosphorus hydrolytic activity from a metagenomic library of cow rumen bacteria. The esterase gene (<I>est</I>5S) is 1098bp in length, encoding a protein of 366 amino acid residues with a molecular weight of 40kDa. Est5S enzyme was successfully produced by <I>Pichia pastoris</I> at a high expression level of approximately 4.0g L<SUP>−1</SUP>. With <I>p</I>-nitrophenol butyrate as the substrate, the optimal temperature and pH for enzyme activity were determined to be 40°C and pH 7.0, respectively. The esterase enzyme was tested for degradation of chlorpyrifos (CP). TLC results obtained inferred that CP could be degraded by esterase enzyme (Est5S) and HPLC results revealed that CP could be efficiently degraded up to 100ppm. Cadusafos (CS), coumaphos (CM), diazinon (DZ) dyfonate (DF), ethoprophos (EP), fenamiphos (FM), methylparathion (MPT), and parathion (PT) were also degraded up to 68, 60, 80, 40, 45, 60, 95, and 100%, respectively, when used as a substrate with Est5S protein. The results highlight the potential use of this enzyme in the cleanup of contaminated insecticides.</P>
Review of More Electric Engines for Civil Aircraft
Yixiong Liu,Da Mo,Devaiah Nalianda,Yiguang Li,Ioannis Roumeliotis 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.4
More electric engines (MEEs) and more electric aircraft are mainly implemented to address the global warming issue and make engines more fuel efficient. Developing technology has made them applicable. This paper presents a detailed introduction to the MEE for civil aircraft, including its architecture, characteristics and performance, as well as the potential benefits of fuel consumption and emissions reduction. It is obvious that the adoption of electric components, such as active magnet bearings, electric starters and generators and electric fuel pumps, is beneficial. It is especially advantageous when mechanical, hydraulic and pneumatic systems with great weight and complex structures are eliminated. Moreover, the exploration of electric propulsion systems indicates that the potential profits are large and tempting. The challenges and technology bottlenecks for MEEs are also discussed. With the further development of battery and motor technology, the MEE will undoubtedly play a dominant role in the civil aircraft market.
Swamy, K. C. Narayana,Devaiah, M. C.,Govindan, R. 한국잠사학회 1993 한국잠사곤충학회지 Vol.35 No.1
Adding a non-fluorescent dye, Rhodamine-B, to the adult diet of uzi fly, Exorista bombycis(Louis) has shown to be a useful method for making the eggs for flight range experiments. The method is timesaving and the dye is safe to handle and the marked eggs are easy to detect. Flies fed on the diet added with dye did not have much negative effect on adult mortality and fecundity, but egg hatchability was affected.
Kye Man Cho,Devaiah M Kambiranda,Seong Weon Kim,Renukaradhya K Math,Woo Jin Lim,Su Young Hong,Han Dae Yun 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.6
Kimbab is the most popular ready-to-eat (RTE) food in Korea. A rapid detection method based on multiplex PCR technique was developed for detection of major food-borne pathogens like Salmonella spp., Shigella spp., Bacillus cereus, Listeria monocytongenes, and Staphylococcus aureus. Specific bands were obtained as 108 bp (Sau, S. aureus), 284 bp (Sal, S. enterica, S. enteritids, and S. typhmurium), 404 bp (Lmo, L. monocytogenes), 475 bp (Bce, B. cereus), and 600 bp (Shi, S. flexineri and S. sonnei). Visible cell numbers varied from 4.14-5.03, 3.61-4.47, and 4.10-5.11 log CFU/g in randomly collected June, July, and August samples, respectively. Among the 30 kimbab samples obtained 83.3% samples were contaminated and 16.7% samples were free from contamination. The highest rate of contamination was with S. aureus (56.7%) followed by B. cereus (43.3%), Salmonella spp. (36.7%), Shigella spp. (13.3%), and L. monocytogenes (6.7%). The identification of the pathogenic species could be faster using one polymerase chain reaction (PCR) and the ability to test for food-borne pathogenic species in kimbab will save time and increase the ability to assure its quality.
Cho, Kye-Man,Lee, Sun-Mi,Math, Renukaradhya K.,Islam, Shah Md. Asraful,Kambiranda, Devaiah M.,Kim, Jong-Min,Yun, Myoung-Geun,Cho, Ji-Joong,Kim, Jong-Ok,Lee, Young-Han,Kim, Hoon,Yun, Han-Dae The Korean Society for Microbiology and Biotechnol 2008 Journal of microbiology and biotechnology Vol.18 No.12
Bacterial diversity and the composition of individual communities during the composting process of swine and mushroom cultural wastes in a field-scale composter (Hazaka system) were examined using a PCR-based approach. The composting process was divided into six stages based on recorded temperature changes. Phylogenetic analysis of eighty 16S rRNA sequences from uncultured composting bacterial groups revealed the presence of representatives from three divisions, including plant pathogenic bacteria, high-molecule-degrading bacteria and spore-forming bacteria. The plant pathogen A. tumefaciens gradually decreased in abundance during the composting process and eventually disappeared during the thermophilic and cooling stage. A bacterium homologous to Bacillus humi first appeared at the early thermophilic stage and was established at the intermediate thermophilic, post-thermophilic, and cooling stages. It was not possible to isolate the B. humi during any of the stages using general culture techniques.