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Banumathi Ramakrishna,Rohan Yewale,Kavita Vijayakumar,Patta Radhakrishna,Balakrishnan Siddartha Ramakrishna 대한병리학회 2020 Journal of Pathology and Translational Medicine Vol.54 No.3
IgG4-related disease of the stomach is a rare disorder, and only a few cases have been reported. We present two cases that were identified over a 2-month period in our center. Two male patients aged 52 and 48 years presented with mass lesion in the stomach, which were clinically thought to be gastrointestinal stromal tumor, and they underwent excision of the lesion. Microscopic examination revealed marked fibrosis, which was storiform in one case, associated with diffuse lymphoplasmacytic infiltration and an increase in IgG4-positive plasma cells on immunohistochemistry. Serum IgG4 level was markedly elevated. Although rare, IgG4-related disease should be considered in the differential diagnosis of gastric submucosal mass lesions.
Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
In this paper, we investigated the alternative sources of limestone. Oyster shell waste originated from aquaculture that causes a major disposal landfill problem in coastal sectors in southeast Korea. Their inadequate disposal causes a significant environmental problems araised. Bio mineralization leads to the formation of oyster shells and consists $CaCO_3$ as a major phase with a small amount of organic matter. It is a good alternative material source instead of natural lime stone. The utilization of oyster shell waste for industrial applications instead of natural limestone is major advantage for conservation of natural limestone. The present work describes the limestone and oyster shells hydraulic activity and chemical composition and characteristics are most similar for utilization of oyster shell waste instead of natural limestone.
The brief review on Coal origin and distribution of rare earth elements in various Coal Ash Samples
Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.2
Rare earth elements together with Y and Sc (REEs) are essential in the development of technology for clean and efficient use of energy. In recent years coal deposits have much attention and attracted as a promising alternative raw sources for rare earth elements, not only because the REEs concentrations in many coals or coal ashes are equal to or higher than those found in conventional types of REEs ores but also because of the world wide demand for REEs in recent years has been greater than supply. In the coal ashes, REEs are mainly associated with carbonates, silicates and aluminosilicates in ashes at 800 and $1100^{\circ}C$. These elements are known to be powerful environmental tracers in natural biogeochemical compartments. In this study, to reviewed the REEs originating and distribution patterns in coal ash samples from the bedrock and/or soil weathering that were entrapped by lichens and mosses was investigated. The REEs patterns of different organisms species allowed minor influence of the species to be highlighted compared to the regional lithology.
Extraction of Precipitated Calcium Carbonate from Oyster Shell waste and Its Applications
Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
In this paper, we reported that the influence of advanced functional mineral filler calcium carbonate ($CaCO_3$) extracted from oyster shell waste, which are rich mineral sources of $CaCO_3$. Oyster Shells, available in abundance, have no eminent use and are commonly regarded as waste. Their improper disposal causes a significant level of environmental concern and also results in a waste of natural resources. Recycling shell waste could potentially eliminate the disposal problem, and also turn an otherwise useless waste into high value added products. Oyster shell waste calcination process to produce pure lime (CaO) which have good anti-microbial property for waste water treatment and then focuses on its current applications to treat the coffee waste and its effluents for biological treatment and utilization as a fertilizers.
( Ramakrishna Dadigala ),( Rajkumar Bandi ),( Chan-woo Park ),( Song-yi Han ),( Azelia Wulan Cindradewi ),( Jeong-ki Kim ),( Gu-joong Kwon ),( Seung-Hwan Lee ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.2
Preparation of Pd nanoparticles (PdNPs) on cellulose nanofibrils (CNF) by a rapid microwave approach is reported here. Variation of solution pH revealed that the neutral pH is optimal for the maximum adsorption of Pd<sup>2+</sup> ions on CNF surface. Subsequent reduction of Pd<sup>2+</sup> ions was achieved using ethylene glycol (EG) as reducing agent under microwave irradiation. Effect of EG amount and microwave irradiation time was also studied. Comparative experiments under conventional heating revealed that 2 h of time is required for complete reduction whereas the microwave irradiation offered in just 120 s. In transmission electron microscopic images PdNPs exhibited spherical morphology and homogenously deposited on CNF with uniform size distribution. Binding interactions between PdNPs and CNF were studied by fourier transform infrared and x-ray photoelectron spectroscopy analysis. X-ray diffraction patterns unveiled the face centered cubic (FCC) crystal structure of PdNPs. Peroxidase mimicking activity of the nanohybrid (PdNPs/CNF) was studied by catalyzing the H<sub>2</sub>O<sub>2</sub> mediated oxidation of 2,2’-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS). Change in the solution color from colorless (ABTS) to blue (ox-ABTS) provides a visual sensing platform for the rapid detection of toxic chemicals and biomolecules.
( Ramakrishna Dadigala ),( Rajkumar Bandi ),( Song-yi Han ),( Chan-woo Park ),( Jeong-ki Kim ),( Seung-woo Cho ),( Seo-young Ma ),( Gu-joong Kwon ),( Seung-hwan Lee ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
Cellulose nanofibrils-supported Pd nanoparticles (PdNPs/CNF) with good enzyme mimicking activities were explored for H2O2 assisted dye degradation. Efficient and rapid method of PdNPs/PCNF preparation is demonstrated by adjusting the pH and microwave irradiation. Optimized conditions for PdNPs/PCNF preparation were found to be pH 7, 3 mM PdCl2, 3 M ethylene glycol and 120 s of microwave irradiation. Enzyme mimicking study by catalyzing the oxidation of 3,3´,5,5´- tetramethylbenzidine (TMB) to a blue colored oxidized TMB (ox-TMB) in the absence and presence of H2O2 revealed the oxidase and peroxidase activities of PdNPs/PCNF, respectively. Further, it exhibited lower Km and higher Vmax values, compared to natural horseradish peroxidase enzyme and specific activities of 415 and 277 U/g for peroxidase and oxidase, respectively. PdNPs/PCNF offered 99.64% degradation of 10 ppm methylene blue within 12 min at 0.4 M H2O2, and pH 5.0 with the rate constant of 0.468 min-1. The catalyst can be easily recovered and reused for up to 10 cycles with above 90% activity. Radical scavenging experiments revealed the involvement of hydroxyl (ㆍOH) and superoxide radicals (-Oㆍ2) in dye degradation.
Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
The objective of this research paper is to discuss the waste coffee residue disposal and its environmental effects on the environment. As we know, coffee is one of the most demand and swallowed beverages in the world, which leads to large quantities of solid waste. Which can be toxic and a lot of environmental problems occur. In developing countries, there is a lack of proper coffee waste residue management. The coffee beans and residues contain several organic compounds. The wastewater from coffee industry emitted several pollutants (highly concentrated) and it contaminates the soil, ground waters, aquatic life, and also human health. Hence it is essential to treat the coffee waste residues. Mean while, oyster shell waste and its disposal also a big environmental challenge in the coastal regions of southeast Korea. In this paper, we focused the treatment of coffee waste residue with oyster shell waste powder. Primarily, oyster shells are calcinated at higher temperatures and investigated the calcined CaO powder as an anti microbic agent to the bacteria presented in coffee waste residues. We successfully applied calcium oxide from oyster shell waste, as an antimicrobic agent.