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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
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.
Ramakrishna, Chilakala,Thriveni, Thenepalli,Whan, Ahn Ji The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
In this paper, we reviewed briefly about the barrier materials for the radioactive waste disposal. The primary concept of the radioactive waste disposal is safety. The goal of the radioactive waste management is to assure that the environment is not adversely affected and also public. There are a wide variety of materials are available for the radioactive waste disposal or storage. Among those coal fly ash is one of the significant materials are used as a barrier material. Here we reported, the Calcium sulfo aluminate (CSA) from coal fly ash is effectively suitable for the radioactive waste disposal. This is one of the ways of utilization of waste and manufactured the valuable materials for future indeeds.
Ramakrishna, Chilakala,Thriveni, Thenepalli,Whan, Ahn Ji The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
In this paper, we reported the current technologies of water scaling removal and also water recovery from the flue gases, which are funded by Department of Energy (DOE), USA. Globally, water resources are limited due to the climate change. The potential impacts of climate change is food and water shortages. In the $21^{st}$ century, water shortages and pollution are expected to become more acute as populations grow and concentrate in cities. At present, the water stress increases over 62.0 ~ 75.8% of total water basin area and decreases over 19.7 ~ 29.0%. Many renewable energy sources demand secure water resources. Water is critical for successful climate change mitigation, as many efforts to reduce greenhouse gas emissions depend on reliable access to water resources. Water hardness is one of the major challenge to coal power plants. Department of energy (DOE) funded and encouraged for the development of advanced technologies for the removal of hardness of water (scaling) and also water recovery from the flue gases from coal power plants.
A brief review on Oyster shells origin and sedimentary evolution for the formation of limestone
Ramakrishna, Chilakala,Thriveni, Thenepalli,Whan, Ahn Ji The Korean Society for Energy 2018 에너지공학 Vol.27 No.3
The shell waste biomineralization process has known a tremendous metamorphosis and also the nanostructure with the identification of matrix proteins in oyster shells. However, proteins are represented in minor shell components and they are the major macromolecules that control biocrystal synthesis. Aragonite and calcite were derived from molluscan shells and evaluated the source of carbonate minerals and it helps for the formation of limestone. The oyster shell wastes are large and massive. The paleoecological study of oyster beds has discovered a near-shore and thin Upper Rudeis formation with storm influence during the accumulation of oysters with highly altered by disarticulation, bioerosion, and encrustation. It is possible even in the Paleozoic mollusks provided sufficient carbonate entirely to the source of microcrystalline of limestone. The present review is to discuss paleoecologically a number of oyster shell beds accumulated and sediment to form the different types of limestone during the Middle Miocene time.
( 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
Nanozymes are artificial enzymes that can overcome the drawbacks of natural enzymes and have gained great attention. In this study, Fe-doped graphitic carbon nitride nanosheets were grafted on TEMPO-oxidized cellulose nanofibrils (FeCNNs/TCNF) by EDC-NHS coupling reaction and its peroxidase mimics were explored. FeCNNs were prepared via thermal polymerization (600 ℃ for 2 h) followed by liquid exfoliation (24 h). Amide bond formation between TCNF and FeCNNs was confirmed by the appearance of a peak at 1588 cm-1 in the FTIR spectrum. Peroxidase activity of FeCNNs/TCNF composite was evaluated by H2O2 mediated oxidation of 3,3′,5,5′ -tetramethylbenzidine (TMB). Upon oxidation, colorless TMB was converted to blue colored ox-TMB with a maximum absorption peak at 652 nm. Effect of various reaction conditions on the peroxidase activity was studied and pH 4.0, temperature 40 ℃ and an incubation time 30 min were optimized. Mechanistic studies by radical scavenging experiments revealed the involvement of hydroxyl radicals (ㆍOH) in the peroxidase reaction.
Ramakrishna Gottipati,Susmita Mishra 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Microporous activated carbon (MAC) was prepared from an economically feasible plant precursor i.e. Aegle Marmelos fruit shell by ZnCl2 activation. The MAC prepared at optimum conditions exhibited highmicropore surface area (1339 m2/g) and micropore volume (0.48 cm3/g). Prepared MAC was applied forthe removal of Cr(VI) from aqueous solution. The adsorption equilibrium was well explained by theFreundlich isotherm and the process followed the pseudo-second order kinetics. The results obtainedshowed that the film diffusion was rate controlling mechanism. The prepared MAC showed betteradsorption capacity towards Cr(VI). The process was modeled by using 24 full factorial designs (FFD).
Is Asia a choice for careers in Innovation?
Ramakrishna, Seeram Asian Society for Innovation and Policy 2012 Asian Journal of Innovation and Policy Vol.1 No.2
Asia is becoming a stronghold for innovation careers along with its resurgence in economic, political, and cultural arenas. This transformation happened on the backdrop of growing enrolments in higher education, increasing investments in scientific research & innovation, and innovation supportive policy measures by several Asian countries. Research and Development (R&D) and product customization centres of multinational corporations (MNCs) sited in emerging nations are also instrumental in this transformation.
Ramakrishna, Chilakala,Thenepalli, Thriveni,Huh, Jae-Hoon,Ahn, Ji Whan The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.1
In this paper, we have developed a simple, new and economical carbonation method to synthesize a pure form of aragonite needles using dolomite raw materials. The obtained aragonite Precipitated Calcium Carbonate (PCC) was characterized by XRD and SEM, for the measurement of morphology, particle size, and aspect ratio (ratio of length to diameter of the particles). The synthesis of aragonite PCC involves two steps. At first, after calcinated dolomite fine powder was dissolved in water for hydration, the hydrated solution was mixed with aqueous solution of magnesium chloride at $80^{\circ}C$, and then $CO_2$ was bubbled into the suspension for 3 h to produce aragonite PCC. Finally, aragonite type precipitated calcium carbonate can be synthesized from natural dolomite via a simple carbonation process, yielding product with average particle size of $30-40{\mu}m$.