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Duraisamy Kalpana,이양수,Krishnamoorthy Srikanth,PB Tirupathi Pichiah,차연수 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
The cultural filtrates of Klebsiella pneumoniae cultured under normal gravity and low shear modeledmicrogravity were potentially used to biosynthesize gold nanoparticles using the precursor gold III chloride trihydrate. The gold nanoparticles produced were spherical, of size between 16-36 and 24-50 nm with the cultural filtratesof normal and low shear modeled microgravity respectively. The characteristic plasmon resonance of gold nanoparticlesoccurred between 535-550 nm in the spectral analysis. XRD reflections (1 1 1), (2 0 0), (2 2 0), (3 1 1) indicatethe face centered cubic and crystalline nature of the biosynthesized gold nanoparticles. The FTIR study proposesthat proteins excreted into the cultural filtrate were involved in the synthesis and stabilization of gold nanoparticles. The in vitro cytotoxicity on 3T3L1, H9c2 and HepG2 cell lines showed the nontoxic and biocompatible nature ofbiosynthesized gold nanoparticles.
Kalpana, Duraisamy,Cha, Hyo-Jung,Choi, Tae-Ki,Lee, Yang-Soo The Plant Resources Society of Korea 2011 한국자원식물학회지 Vol.24 No.6
Mulberries have importance in the sericulture industry as food for Bombyx mori, silkworm reared for its silk. Korean Morus alba have many cultivars and, for the protection of these cultivars and for utilization in plant-breeding programs, genetic information and the diversity among cultivars are essential. This study with 14 mulberry genotypes was undertaken using RAPD and ISSR fingerprinting to discover the genetic divergences between cultivars. Polymorphism rate among the cultivars produced by RAPD primer was found to be 64.48% and 66.29% relative to ISSR primer. The genetic relationships among the cultivars were identified using a dendrogram constructed with the UPGMA clustering method. Nei's method was used to calculate the genetic dissimilarity coefficients between each pair of genotypes, and the highest dissimilarity coefficient of 0.246 was exhibited between Suwon and Hwanggum cultivars. To determine the efficiency of each primer, a polymorphic index was calculated, and the robustness of the dendrogram was checked using cophenetic correlation coefficient. The results of this study can be utilized for the improvement of mulberry varieties in plant-breeding programs.
( Duraisamy Kalpana ),( Hyo Jung Cha ),( Moon Ki Park ),( Yang Soo Lee ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.3
Spaceflights results in the reduction of immune status of human beings and increase in the virulence of microorganisms, especially gram negative bacteria. The growth of Klebsiella pneumoniae is enhanced by catecholamines and during spaceflight, elevation in the levels of cortisols occurs. So it is necessary to know the changes in physiology, virulence, antibiotic resistance and gene expression of K. pneumoniae under microgravity conditions. The present study was undertaken to study effect of simulated microgravity on growth, morphology, antibiotic resistance and cross stress resistance of K. pneumoniae to various stresses. The susceptibility of simulated microgravity grown K. pneumoniae to ampicillin, penicillin, streptomycin, kanamycin, hygromycin and rifampicin were evaluated. The growth of bacteria was found to be fast compared with normal gravity grown bacteria and no significant changes in the antibiotic resistance were found. The bacteria cultured under microgravity conferred cross stress resistance to acid, temperature and osmotic stress higher than the normal gravity cultured bacteria but the vice versa was found in case of oxidative stress.
Decolorization of Isolan Dark Blue dye by Irpex lacteus
Duraisamy Kalpana,Cha Hyo Jung,Han Jung Hoon,Yang Soo Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Effluents containing dye is of highly problematic because when they are released in environment they exhibit toxic effects on organisms and reduce the sunlight penetration. Bioremediation of textile dyes are environment friendly and cost competitive. The present study was carried to decolorize the Isolan dark blue dye by the white rot fungi Irpex lacteus. The decolorization reactions were carried at different pH 5.0, 6.0, 7.0. 8.0, 9.0, and at different temperatures 20°C, 25°C, 30°C and 35°C. Decolorization of the dye was also carried at different concentrations ranging from 50-250㎎/l. The percentage of decolorization was checked for every 12 hours and it was found that the dye was decolorized completely at the maximum of fourth day with all the parameters tested. The alkaline pH increased the decolorization rate than the acidic and neutral pH. The temperature had no significant influence on the decolorization rate the decolorization percentage was similar at the temperatures 25°C, 30°C and 35°C and it was slow at the 20°C. The dye was completely decolorized at the third day for concentrations of 50㎎/l and 100㎎/l whereas the 150, 200 and 250㎎/l concentrations were decolorized completely on the fourth day. The decolorization of the dye was confirmed by the UV spectrum analysis. The present study suggests that the fungus Irpex lacteus can be effectively used for the bioremediation of the Isolan dark blue dye.
Multipurpose Polyurethane Antimicrobial Metal Composite Films via Wet Cast Technology
Rajkumar Nirmala,김학용,Duraisamy Kalpana,Rangaswamy Navamathavan,이양수 한국고분자학회 2013 Macromolecular Research Vol.21 No.8
We report on the preparation and characterization of polyurethane (PU) film containing metal particles and their antibacterial activity. The utilized PU films containing metal particles were prepared by a simple solvent evaporation method. The surface morphology, structure and optical properties of the resultant products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and UV-vis spectroscopy. The antibacterial activity was tested against four common food borne pathogenic bacteria, namely, Staphylococcus aureus, Escherichia coli, Salmonella typhimurium,and Klebsiella pneumoniae by minimum inhibitory concentration (MIC) method. Our results demonstrated that no bactericidal activity was detected for the pristine PU film. Further on, antibacterial activity was observed to be more pronounced for the PU films containing metal particles which were attributed to the presence of metal in the PU thin films. Overall, this study demonstrates the fabrication of cheap, stable and effective material with excellent antimicrobial activity that can be utilized to inhibit the microbial growth associated with food stuff.
Bactericidal Efficacy of Electrospun Rosin/Poly(ε-caprolactone) Nanofibers
Rajkumar Nirmala,김학용,백우일,Rangaswamy Navamathavan,김태우,Duraisamy Kalpana,박미라,박수진 한국고분자학회 2014 Macromolecular Research Vol.22 No.2
Poly(ε-caprolactone) (PCL)-containing rosin nanofibers were prepared via electrospinning technique forbiomedical applications. To improve the biocompatibility properties, rosin was blended into PCL to prepare nanofibers. Nanofibers mats were prepared with different concentrations of rosin. The morphology, structure, and thermalproperties of the resultant PCL/rosin nanofibers were analyzed using scanning electron microscopy (SEM), X-raydiffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), andthermogravimetry (TGA) analysis. SEM images revealed that the nanofibers were well-oriented and had good incorporationof rosin. FTIR results indicated the various bonding groups of PCL/rosin nanofibers with stable structure. TGA analysis revealed that the onset degradation temperature was decreased with increasing rosin content in thenanofibers. The bactericidal activity of PCL/rosin nanofibers was also investigated. These results indicate that thePCL blended with rosin nanofibers can be utilized as a promising candidate material for many biomedical applications.
Antimicrobial activity of electrospun polyurethane nanofibers containing composite materials
Rajkumar Nirmala,Hak Yong Kim,박수진,Duraisamy Kalpana,Rangaswamy Navamathavan,박미라 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
We report on the preparation and characterization of electrospun polyurethane nanofibers containing silver,cactus, rosin and Scutellariae Radix. The utilized polyurethane nanofibers containing different composite materialswere prepared by a simple dip coating method. The morphology, structure and thermal characteristics of as-preparedcomposite nanofibers were studied by scanning electron microscopy, X-ray diffraction, Fourier transform infrared, Ramanspectroscopy and thermogravimetric analysis. The antimicrobial activity of the composite nanofibers was tested againsttwo common food borne pathogenic bacteria, Staphylococcus aureus and Escherichia coli, by the minimum inhibitoryconcentration method. Our results demonstrated that more pronounced antimicrobial activities were observed for thecomposite nanofibers. Overall, the fabrication of cheap, stable and effective material with excellent antimicrobial activitycan be utilized to inhibit the microbial growth associated with food stuff.