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- 검색키워드
- 저자 : Velmurugan, (검색결과 59 건)
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Velmurugan, P.,Shim, J.,Oh, B. T. Springer Science + Business Media 2016 Research on chemical intermediates Vol.42 No.6
<P>This study evaluated the performance of amine-functionalized mesoporous hollow spheres obtained using corn cob (an agriculture byproduct) nanosilica as support material for amine immobilization (NH2-MHS) for removal of Congo Red (CR) dye from aqueous solution. Physical characteristics of adsorbents were studied using zeta potential, N-2 adsorption-desorption isotherms, surface area, high-resolution transmission electron microscopy, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. The effects of various physiochemical parameters such as pH (3-9), different adsorbents, temperature (15, 25, and 35 A degrees C), initial dye concentration (10-500 mg/L), and adsorbent dosage (0.1-1.0 g) on the CR removal efficiency were investigated. The equilibrium adsorption data were well fit by the Freundlich model. The maximum adsorption capacity of CR onto NH2-MHS according to the Langmuir isotherm model was 98.72 mg/g at 35 A degrees C and pH 7. The adsorption kinetics were well fit using a pseudo-second-order kinetic model.</P>
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Evaluation of intracellular lipid bodies in Chlamydomonas reinhardtii strains by flow cytometry
Velmurugan, N.,Sung, M.,Yim, S.S.,Park, M.S.,Yang, J.W.,Jeong, K.J. Elsevier Applied Science 2013 Bioresource technology Vol.138 No.-
A comparative study of Chlamydomonas reinhardtii wild type CC124 and a cell wall-less mutant sta6-1 is described using FACS in conjunction with two different lipophilic fluorescent dyes, Nile Red and BODIPY 505/515. The results indicate that BODIPY 505/515 is more effective for the vital staining of intracellular lipid bodies and single cell sorting than Nile Red. While BODIPY 505/515 stained cells continued to grow after single cell sorting using FACS, Nile Red stained cells failed to recover from sorting. In addition, a comprehensive study was performed to establish a quantitative baseline for future studies for either lipid accumulation and/or microalgal growth by measuring various parameters such as cell count, size, fatty acid contents/composition, and optical/confocal images of the wild type and mutant.
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Velmurugan, Palanivel,Shim, Jaehong,Seo, Sang-Ki,Oh, Byung-Taek THE KOREAN FIBER SOCIETY 2016 FIBERS AND POLYMERS Vol. No.
This study evaluated the extraction of two colors of dye (yellow and brown) from Coreopsis tinctoria flower petals using ultrasound and the dyeing of leather with the extracted dyes as a source of nontoxic and eco-friendly dye. The results showed an increase in the dye extraction values with increasing time at 100 W ultrasonic power at <TEX>$80^{\circ}C$</TEX> for 1 h. Leather dyeing was optimized with the aid of ultrasound and magnetic stirring. The optimum leather dyeing conditions, with respect to the dye uptake, dye penetration and intensity of the color, were determined to be 12 % dye concentration, 100 W power, 1,000 rpm, and pH 7.0 for 60 min at <TEX>$80^{\circ}C$</TEX>. It was shown that sonication improves dye exhaustion from a 90 % to 60 % rating for 1 h of dyeing time. The dyed leather was assessed by reflectance measurements and compared with visual assessment data. The fastness properties of dyed leather samples showed good fastness against washing, light, and dry and wet rubbing. The strength properties were not significantly altered and the bulk properties, such as softness, were found to be improved by the use of Coreopsis tinctoria yellow and brown dyes using an ultrasonic and magnetic stirring dyeing process.
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Velmurugan, Natarajan,Lee, Hyun-Mi,Cha, Hyo-Jung,Lee, Yang-Soo De Gruyter 2017 Botanica marina Vol.60 No.4
<P>An efficient and unique proteomic response is important for fungi to survive in marine environments polluted with polycyclic aromatic hydrocarbons (PAHs). The marine-derived fungus Paecilomyces sp. strain SF-8 was isolated from the soil of salt production sites and was found to remove different PAHs. The PAH-treated strain SF-8 was characterized using elemental analysis and Fourier transform infrared spectroscopy. Paecilomyces sp. strain SF-8 successfully removed 88% of anthracene, 75% of phenanthrene, 67.5% of benzo[a] anthracene, and 99.3% of benzo[b] fluoranthene. In order to gain insight into the molecular response to PAHs in strain SF-8, proteomics analysis of different cells treated with different PAHs was performed. Comprehensive proteomic analysis revealed that the molecular response of the fungus towards PAH was compound specific. Functional classifications showed heightened regulation of major enzymes involved in cellular function and metabolism, and PAH degradation. The key control protein (salicylaldehyde dehydrogenase) of PAH degradation was specifically over-expressed. Our results collectively demonstrated the influence of PAHs in fungal cellular functioning, development and metabolism.</P>
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Velmurugan. S,P.Ezhumalai,E.A. Mary Anita 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.7
Recent advances in Cognitive Radio Networks (CRN) have elevated them to the status of a critical instrument for overcoming spectrum limits and achieving severe future wireless communication requirements. Collaborative spectrum sensing is presented for efficient channel selection because spectrum sensing is an essential part of CRNs. This study presents an innovative cooperative spectrum sensing (CSS) model that is built on the Firefly Algorithm (FA), as well as machine learning artificial neural networks (ANN). This system makes use of user grouping strategies to improve detection performance dramatically while lowering collaboration costs. Cooperative sensing wasn't used until after cognitive radio users had been correctly identified using energy data samples and an ANN model. Cooperative sensing strategies produce a user base that is either secure, requires less effort, or is faultless. The suggested method's purpose is to choose the best transmission channel. Clustering is utilized by the suggested ANN-FA model to reduce spectrum sensing inaccuracy. The transmission channel that has the highest weight is chosen by employing the method that has been provided for computing channel weight. The proposed ANN-FA model computes channel weight based on three sets of input parameters: PU utilization, CR count, and channel capacity. Using an improved evolutionary algorithm, the key principles of the ANN-FA scheme are optimized to boost the overall efficiency of the CRN channel selection technique. This study proposes the Artificial Neural Network with Firefly Algorithm (ANN-FA) for cognitive radio networks to overcome the obstacles. This proposed work focuses primarily on sensing the optimal secondary user channel and reducing the spectrum handoff delay in wireless networks. Several benchmark functions are utilized We analyze the efficacy of this innovative strategy by evaluating its performance. The performance of ANN-FA is 22.72 percent more robust and effective than that of the other metaheuristic algorithm, according to experimental findings.The proposed ANN-FA model is simulated using the NS2 simulator, The results are evaluated in terms of average interference ratio, spectrum opportunity utilization, three metrics are measured: packet delivery ratio (PDR), end-to-end delay, and end-to-average throughput for a variety of different CRs found in the network.
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One-step phyto-mediated fabrication of silver nanoparticles and its anti-microbial properties
Velmurugan Palanivel,Sung-Chul Hong,Veera Ravi Arumugam,Sivakumar Subpiramaniyam,Pyong-In Yi,Seong-Ho Jang,Jeong-Min Suh,Eun-Sang Jung,Je-Sung Park Techno-Press 2023 Advances in nano research Vol.14 No.4
This manuscript describes the one-step eco-friendly green fabrication of silver nanoparticles (AgNPs) through the in-situ bio-reduction of an aqueous solution of silver nitrate using Syzygium aromaticum leaf extract. UV-vis spectroscopy shows a characteristic SPR peak around 442 nm. FTIR spectroscopy showed that the AgNPs were capped with bioactive phyto-molecules. TEM images revealed oval and spherical particles with a mean diameter of ~12.6 nm. XRD analysis revealed crystalline and face-cantered cubic AgNPs. The phytosynthesized AgNPs showed broad-spectrum anti-microbial activity against two foodborne pathogenic bacteria, Listeria monocytogenes and Staphylococcus aureus. The AgNPs showed a prominent ability to inhibit biofilms formed by L. monocytogenes and S. aureus in laboratory conditions through a crystal violet assay. The results suggest that the AgNPs could be a novel nanotool to develop effective antimicrobial and anti-biofilm agents in food preservation.
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Velmurugan, P.,Kim, J.I.,Kim, K.,Park, J.H.,Lee, K.J.,Chang, W.S.,Park, Y.J.,Cho, M.,Oh, B.T. Elsevier Sequoia 2017 Journal of photochemistry and photobiology. B, Bio Vol.173 No.-
The main objective of this study was to extract natural colorant from purple sweet potato powder (PSPP) via a water bath and ultrasound water bath using acidified ethanol (A. EtOH) as the extraction solvent. When optimizing the colorant extraction conditions of the solvents, acidified ethanol with ultrasound yielded a high extraction capacity and color intensity at pH2, temperature of 80<SUP>o</SUP>C, 20mL of A. EtOH, 1.5g of PSPP, time of 45min, and ultrasonic output power of 75W. Subsequently, the colorant was extracted using the optimized conditions for dyeing of textiles (leather, silk, and cotton). This natural colorant extraction technique can avoid serious environmental pollution during the extraction and is an alternative to synthetic dyes, using less solvent and simplified abstraction procedures. The extracted purple sweet potato natural colorant (PSPC) was used to dye leather, silk, and cotton fabrics in an eco-friendly approach with augmented antibacterial activity by in situ synthesis of silver nanoparticles (AgNPs) and dyeing. The optimal dyeing conditions for higher color strength (K/S) values were pH2 and 70<SUP>o</SUP>C for 45min. The colorimetric parameters L<SUP>*</SUP>, a<SUP>*</SUP>, b<SUP>*</SUP>, C, and H were measured to determine the depth of the color. The Fourier transform infrared spectroscopy (FTIR) spectra of undyed control, dyed with PSPC and dyed with blend of PSPC and AgNPs treated leather, silk and cotton fabric were investigated to study the interaction among fiber type, nanoparticles, and dye. The structural morphology of leather and silk and cotton fabrics and the anchoring of AgNPs with elemental compositions were investigated by scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). The dry and wet rubbing fastness for dye alone and dye with nanoparticles were grade 4-5 and 4, respectively. Thus, the results of the present study clearly suggest that in situ synthesis of AgNPs along with dyeing should be considered in the development of antimicrobial textile finishes.
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Velmurugan, Palanivel,Iydroose, Mahudunan,Lee, Sang-Myung,Cho, Min,Park, Jung-Hee,Balachandar, Vellingiri,Oh, Byung-Taek Association of Microbiologists of India 2014 Indian journal of microbiology Vol.54 No.2
<P>This study reveals a green process for the production of multi-morphological silver (Ag NPs) and gold (Au NPs) nanoparticles, synthesized using an agro-industrial residue cashew nut shell liquid. Aqueous solutions of Ag(+) ions for silver and chloroaurate ions for gold were treated with cashew nut shell extract for the formation of Ag and Au NPs. The nano metallic dispersions were characterized by measuring the surface plasmon absorbance at 440 and 546?nm for Ag and Au NPs. Transmission electron microscopy showed the formation of nanoparticles in the range of 5-20?nm for silver and gold with assorted morphologies such as round, triangular, spherical and irregular. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analyses of the freeze-dried powder confirmed the formation of metallic Ag and Au NPs in crystalline form. Further analysis by Fourier transform infrared spectroscopy provided evidence for the presence of various biomolecules, which might be responsible for the reduction of silver and gold ions. The obtained Ag and Au NPs had significant antibacterial activity, minimum inhibitory concentration and minimum bactericidal concentration on bacteria associated with fish diseases.</P>
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