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Suman,C.S.Pundir 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Commercially available cholesterol esterase, cholesterol oxidase and peroxidase have been co-immobilized onto alkylamine glassinitial activity. The co-immobilized enzyme system showed maximum activity at pH 7.0, when incubated at 37.C for 12 min. Amethod was developed for total serum cholesterol determination employing co-immobilized enzymes. There was a linear rela-tionship betweenA520 and cholesteryl acetate concentration ranging from 5mg to 50 mg/dl reaction mixture. The minimum de-tection limit of the method is 50 mg/dl. Within day and between day coecient of variation were< 1.0% and < 6%, respectively. Ar¼ 0:83) was found between the total serum cholesterol obtained by the present method and commercial Enzo-kitmethod employing free enzymes. Among the various serum substances tested at their physiological concentrations; Testosterone, vitD and progesterone caused 59%, 41% and 39% inhibition, while NaCl, KCl, CuSO4, creatinine, NaHCO3, albumin and estrogenhad practically no eect.. 2002 Elsevier Science B.V. All rights reserved.
Suman Laxmi Narayan,De Souvik,Sharma Gaurav,Mandal Udita,Bhattacherjee Rashmi,Banerjee Dhriti,Suman Devi Shankar 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Biological control of larval mosquitoes is in great demand due to the development of resistance against synthetic insecticides, environmental toxicity and the inability to protect habitats from further oviposition. In the present study, three botanical essential oils (BEOs) – citronella, eucalyptus, and pine oils – were formulated for the assessment of larvicidal and oviposition repellent efficacies against Culex quinquefasciatus Say, the filaria vector. The GC–MS profiling of BEOs showed the presence of 16 – 19 compounds covering 87.7–93% of oil composition. The resistance status of Culex quinquefasciatus population was evaluated with temephos (LC 50 = 0.001 ppm, LC 90 = 0.01 ppm). Larval bioassay of emulsifiable concentrate (EC) formulations prepared from eucalyptus and pine oils showed promising efficacy (LC 50 = 22.7 and 23.2 ppm) and LC 90 (63.8 and 62.4 ppm) compared to citronella oil EC (LC 50 = 43.4 ppm and LC 90 = 199.0 ppm). The field trials of eucalyptus + pine (1:1 ratio) EC showed 100% larval mortality for 3 weeks at 300 ppm compared to 2 weeks of individual oils. Further, the oviposition attraction index (OAI) for ECs of eucalyptus, pine, and their combination showed complete protection of breeding habitats from oviposition at 1st week and − 0.9 to − 1.0 OAI at 2nd week with slight reduction to − 0.5 at 3rd week. Citronella EC provided shortest larvicidal and oviposition repellent efficacy under the field con ditions. The promising mosquitocidal activities of EC formulations of eucalyptus and pine or their combination suggest them as potential biocontrol vector control candidates over citronella oil.
Application of Cavity Expansion Theory for Evaluating Skin Friction of Tapered Piles in Sands
Suman Manandhar,Noriyuki Yasufuku,Kiyoshi Omine 한국지반공학회 2012 international journal of geo-engineering Vol.4 No.3
This paper discusses the effects of tapered pile penetration in sandy soils after having obtained evidence of its merits over straight-sided cylindrical piles in evaluating skin friction. Experimental model tests confirmed that a slight increase in the angle of tapering also led to a major increase in skin friction. Based on this evidence, the authors adopted an analytical solution to evaluate the skin friction of tapered piles, The cylindrical cavity expansion theory is an appropriate analytical closed-form solution in determining the skin friction of tapered piles at different phases of soils at different relative densities, A new arrangement was inserted by introducing a stress-dilatancy relationship in the ideal elastic-plastic model of cavity expansion application, n general. for easy computation, he angle of internal friction or dilatancy angle is assumed to he constant to compute the skin friction. This drawback was improved upon and both properties considered in evaluating skin friction at each depth iteratively. This paper assesses the results of paranietric studies on different types of model tests, prototype tests and real type pile tests in order to predict the proposed model. The proposed extended model validates the determination of skin friction using a stress-dilatancy relationship.
Suman Tripathi,Maheshwar Sharon,N.N. Maldar,Jayashri Shukla,Madhuri Sharon 한국탄소학회 2013 Carbon Letters Vol.14 No.4
The synthesis of carbon nanomaterials (CNMs) by a chemical vapor deposition method using three different plant oils as precursors is presented. Because there are four param-eters involved in the synthesis of CNM (i.e., the precursor, reaction temperature of the furnace, catalysts, and the carrier gas), each having three variables, it was decided to use the Taguchi optimization method with the ‘the larger the better’ concept. The best parameter regarding the yield of carbon varied for each type of precursor oil. It was a temperature of 900°C + Ni as a catalyst for neem oil; 700°C + Co for karanja oil and 500°C + Zn as a catalyst for castor oil. The morphology of the nanocarbon produced was also impacted by different parameters. Neem oil and castor oil produced carbon nanotube (CNT) at 900°C; at lower temperatures, sphere-like structures developed. In contrast, karanja oil produced CNTs at all the assessed temperatures. X-ray diffraction and Raman diffraction analyses confirmedthat the nanocarbon (both carbon nano beads and CNTs) produced were graphitic in nature.
Suman Swapan,Rajak Dilip K.,Ansari Ziaul Haque 한국자원공학회 2023 Geosystem engineering Vol.26 No.5
Electronic (e-)waste viz. the spent fluorescent lamps can be a rich source of rare earth elements (REEs) for the secondary supply of them. This article reports a comparative study on mineral acid leaching and, then, compared an alkali diffusion-acid leaching process for higher efficiency of yttrium and europium. Using a direct acid leach process, 2 M HNO3 yielded a better dissolution efficiency of REEs at the moderate temperature of 60°C and in the presence of H2O2in comparison to 91% and 87% leaching efficiency with 2.0 M H2SO4. On the other hand, the alkali-fused phosphor mass leached in 2.0 M H2SO4 without H2O2 addition showed remarkable progress in dissolution efficiency, yielding >99% and >98% of yttrium and europium in the leach liquor. Furthermore, the leaching kinetics of the alkali-diffused phosphor showed the best fit with the logarithmic rate law. The apparent activation energy was calculated to be 43.3 kJ/mol and 35.1 kJ/mol for yttrium and europium, indicating two different mechanisms during the leaching process by following the chemical- and diffusion-controlled reactions, respectively.
Characterization of 1,3-Propanediol Oxidoreductase (DhaT) from Klebsiella pneumoniae J2B
Suman Lama,노수문,설은희,Balaji Sundara Sekar,Satish Kumar Ainala,Jayaraman Thangappan,송효학,승두영,박성훈 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6
1,3-propanediol oxidoreductase (DhaT) of Klebsiella pneumoniae converts 3-hydroxypropionaldehyde (3-HPA) to 1,3-propanediol (1,3-PD) during microbial production of 1,3-PD from glycerol. In this study, DhaT from newly isolated K. pneumoniae J2B was cloned, expressed, purified, and studied for its kinetic properties. It showed, on its physiological substrate 3-HPA, higher activity than similar aldehydes such as acetaldehyde, propionaldehyde and butyraldehyde. The turnover numbers (kcat, 1/s) were estimated as 59.4 for the forward reaction (3-HPA to 1,3-PD at pH 7.0) and 10.0 for the reverse reaction (1,3-PD to 3-HPA at pH 9.0). The Michaelis constants (Km, mM) were 0.77 (for 3-HPA) and 0.03 (for NADH) for the forward reaction (at pH 7.0), and 7.44 (for 1,3-PD) and 0.23 (for NAD+) for the reverse reaction (at pH 9.0). Between these forward and reverse reactions, the optimum temperature and pH were significantly different (37°C and 7.0 vs. 55°C and 9.0, respectively). These results indicate that, under physiological conditions, DhaT mostly catalyzes the forward reaction. The enzyme was seriously inhibited by heavy metal ions such as Ag+ and Hg2+. DhaT was highly unstable when incubated with its own substrate 3-HPA, indicating the necessity of enhancing its stability for improved 1,3-PD production from glycerol.
Review of State-of-the-Art Sensor Applications Using Mechanoluminescence Microparticles
Suman Timilsina,김지식,김재환,김기우 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.9
The term mechanoluminescence (ML) refers to the light emission from various organic and inorganic materials in response to mechanical stimuli such as friction, tension, fracture, and compression. Recently, this interesting luminescence phenomenon has enabled us to explore various advanced sensor applications. In this review article, the overall ML mechanism that arises under different experimental conditions is discussed thoroughly. The recent research achievements of state-of-the-art sensors based on ML microparticles such as SrAl2O4:Eu,Dy (SAO), ZnS:Cu, and ZnS:Mn are then reviewed. As a new functional smart material, SAO ML microparticles can be used in possible substitutive and substantial methods for structural health monitoring (SHM) systems, owing to their relative simplicity but effectiveness in detecting arrested or propagating crack tips, and in assessing the in-situ structural state by means of fracture parameters such as stress intensity factors. The applicability of ML paint and thin films on various types of ceramics and concretes as fracture sensors is reviewed. The research on sensors based on different ML microparticles such as noncontact torque sensors based on ZnS:Cu, flexible pressure sensors and impact sensors using ZnS:Mn is also reviewed in this article. Potential applications using ML microparticles are also briefly discussed.