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Rathika, Chinniah,Murali, Vijayan,Dhivakar, Mani,Kamaraj, Raju,Malini, Ravi Padma,Ramgopal, Sivanadham,Balakrishnan, Karuppiah Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5
Background: Human leukocyte antigen (HLA) genes have been implicated in cervical cancer in several populations. Objectives: To study the predispositions of HLA alleles/haplotypes with cervical cancer. Materials and Methods: Clinically diagnosed and PAP smear confirmed cervical cancer patients (n 48) and age matched controls (n 47) were genotyped for HLA-A,-B,-DRB1* and DQB1* alleles by PCR-SSP methods. Results: The frequencies of alleles DRB1*04 (OR=2.57), DRB1*15 (OR=2.04), DQB1*0301 (OR=4.91), DQB1*0601 (OR=2.21), B*15 (OR=13.03) and B*07 (OR=6.23) were higher in cervical cancer patients than in the controls. The frequencies of alleles DRB1*10 (OR=0.22) and B*35 (OR=0.19) were decreased. Strong disease associations were observed for haplotypes DRB1*15-DQB1*0601 (OR=6.56; p< $3.5{\times}10^{-4}$), DRB1*14-DQB1*0501 (OR=6.51; p<0.039) and A*11-B*07 (OR=3.95; p<0.005). The reduced frequencies of haplotypes DRB1*10-DQB1*0501 (OR=0.45), A*03-B*35 (OR=0.25) and A*11-B*35 (OR= 0.06) among patients suggested a protective association. HLA-C* typing of 8 patients who possessed a unique three locus haplotype 'A*11-B*07-DRB1*04' (8/48; 16.66%; OR=6.51; p<0.039) revealed the presence of a four locus haplotype 'A*11-B*07-C*01-DRB1*04' in patients (4/8; 50%). Amino acid variation analysis of susceptible allele DQB1*0601 suggested 'tyrosine' at positions ${\beta}9$ and ${\beta}37$ and tyrosine-non-tyrosine genotype combination increased the risk of cervical cancer. Conclusions: Strong susceptible associations were documented for HLA alleles B*15, B*07, DRB1*04, DRB1*15, DQB1*0301, DQB1*0601 and haplotypes DRB1*15-DQB1*0601 and DRB1*14-DQB1*0501. Further, protective associations were evidenced for alleles B*35 and DRB1*10 and haplotypes A*11-B*35 and DRB1*10-DQB1*0501 with cervical cancer in South India.
Rathika, R.,Byung-Taek, Oh,Vishnukumar, B.,Shanthi, K.,Kamala-Kannan, S.,Janaki, V. De Gruyter 2018 E-Polymers Vol.18 No.4
<P><B>Abstract</B></P><P>The role of polypyrrole-cellulose (PPy-Ce) nanocomposite for the removal of Ni(II) from aqueous solution was investigated by batch experiments. The PPy-Ce nanocomposite was prepared by chemical oxidate polymerization of pyrrole monomer with cellulose. Transmission electron micrography (TEM) showed the size of the particles varied from 80 to 95 nm. The characteristic C-O, O-H, C-N and C-C vibrations in the Fourier transform infrared (FTIR) spectra indicate that the cellulose successfully integrated with the pyrrole. Influence of experimental variables such as pH, contact time, adsorbent dose and initial Ni(II) concentration were optimized using the response surface methodology (RSM) based Box-Behnken design (BBD). The optimal conditions for maximum removal of Ni(II) were pH 8, time 65 min, adsorbent dose 0.3 mg/l and Ni(II) concentration 50 mg/l. The maximum removal efficiency under optimized conditions was >94%. The results indicate that BBD could be used to optimize experimental conditions for metal removal from aqueous solution.</P>
Rathika, R.,Kovendhan, M.,Joseph, D. Paul,Pachaiappan, Rekha,Kumar, A. Sendil,Vijayarangamuthu, K.,Venkateswaran, C.,Asokan, K.,Jeyakumar, S. Johnson Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.11
Swift heavy ion (SHI) beam irradiation can generate desirable defects in materials by transferring sufficient energy to the lattice that favours huge possibilities in tailoring of materials. The effect of Ag<sup>15+</sup> ion irradiation with energy 200 MeV on spray deposited V<sub>2</sub>O<sub>5</sub> thin films of thickness 253 nm is studied at various ion doses from 5 × 10<sup>11</sup> to 1 × 10<sup>13</sup> ions/㎠. The XRD results of pristine film confirmed orthorhombic structure of V<sub>2</sub>O<sub>5</sub> and its average crystallite size was found to be 20 nm. The peak at 394 cm<sup>-1</sup> in Raman spectra confirmed O-V-O bonding of V<sub>2</sub>O<sub>5</sub>, whereas 917 cm<sup>-1</sup> arise because of distortion in stoichiometry by a loss of oxygen atoms. Raman peaks vanished completely above the ion fluence of 5 × 10<sup>12</sup> ions/㎠. Optical studies by UV-Vis spectroscopy shows decrement in transmittance with an increase in ion fluence up to 5 × 10<sup>12</sup> ions/㎠. The red shift is observed both in the direct and indirect band gaps until 5 × 10<sup>12</sup> ions/㎠. The surface topography of the pristine film revealed sheath like structure with randomly distributed spherical nano-particles. The roughness of film decreased and the density of spherical nanoparticles increased upon irradiation. Irradiation improved the conductivity significantly for fluence 5 × 10<sup>11</sup> ions/㎠ due to band gap reduction and grain growth.
R. Rathika,S. Austin Suthanthiraraj 한국고분자학회 2016 Macromolecular Research Vol.24 No.5
A new series of magnesium-ion conducting solid polymer blend electrolytes based on an optimized blend ratio (90:10) of poly(ethylene oxide) (PEO) and poly(vinylidene fluoride) (PVDF) doped with different concentrations of magnesium bis (trifluoromethane sulfonimide) salt, Mg [(CF3SO2)2N2)] has been prepared by solution casting technique, using dimethylformamide (DMF) as the common solvent. The increase in the amorphous phase with an increase in salt concentration of the prepared blended polymer electrolytes has also been nurtured from the results obtained from X-ray diffraction (XRD) and scanning electron microscopic (SEM) analyses. The electrical transport characteristics were evaluated by means of electrochemical impedance spectroscopy (EIS) and the maximum ionic conductivity obtained at room temperature (298 K) was found to be 1.2×10-5 S cm-1 in the case of the blend containing 15 wt% salt. A detailed investigation concerning the mechanism of magnesium ion transport in the optimized polymer blend electrolyte over the frequency range of 1 MHz to 20 Hz has also been carried out in terms of electrical conductivity spectra, dielectric properties and electrical modulus spectra at room temperature.
R. Rathika,M. Kovendhan,D. Paul Joseph,K. Vijayarangamuthu,A. Sendil Kumar,C. Venkateswaran,K. Asokan,S. Johnson Jeyakumar 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.8
Spray deposited Molybdenum trioxide (MoO3) thin film of thickness nearly 379 nm were irradiated with 200 MeV Ag15þ ion beam at different fluences (Ø) of 5 1011,1 1012,5 1012 and 1 1013 ions/cm2. The X-ray diffraction (XRD) pattern of the pristine film confirms orthorhombic structure and the crys-tallinity decreased after irradiation with the fluence of 5 1011 ions/cm2 due to irradiation induced defects and became amorphous at higher fluence. In pristine film, Raman modes at 665, 820, 996 cm1 belong to MoeO stretching, 286 cm1 belong to MoeO bending mode and those below 200 cm1 are associated with lattice modes. Raman peak intensities decreased upon irradiation and vanished completely for the ion fluence of 5 1012 ions/cm2. The percentage of optical transmittance of pristine film was nearly 40%, while for irradiated films it decreased significantly. Red shift was observed for both the direct and indirect band gaps. The pristine film surface had densely packed rod like structures with relatively less porosity. Surface roughness decreased significantly after irradiation. The electrical trans-port properties were also studied for both the pristine and irradiated films by Hall effect. The results are discussed.
Ganesan, S.,Mathew, Vinod,Rathika, R.,Muthuraaman, B.,Maruthamuthu, P.,Suthanthiraraj, S. Austin,Kim, Jaekook Elsevier 2018 Materials science and engineering B. Advanced Func Vol.229 No.-
<P>The present study reports on a novel polymer blend electrolyte system comprised of poly(ethylene oxide), poly (vinylidene fluoride) and poly (methyl methacrylate) (PEO/PVdF/PMMA) with potassium iodide, iodine and novel and cost effective organic compounds such as 1-(2-(2-(2-(2-(benzoate)ethoxy)ethoxy)ethoxy)ethoxy) benzene (BEB) and 1-(2-(2-(2-(2-(1}1-pyrazol-1-yl)ethoxy)ethoxy)ethoxy)ethyl)-1H-pyrazole (PEP) for dye-sensitized solar cell applications. The influence of the synthesized organic compounds on the ionic and photovoltaic characteristics of the electrolytes was studied. In specific, the PEO/INdF/PMMA/ICVI2/PEP blend electrolyte exhibited high ionic conductivity of 6.3 x 10(-4) S cm(-1) and the corresponding DSSC demonstrated an enhanced conversion efficiency of 9%. The high photovoltaic conversion efficiency of the cell with the PEP-doped system can be attributed to the higher conductivities in the polymer electrolyte associated with the greater cross-linking and the increased I-/I-3(-) transportation along the interaction of the tetra ethylene glycol derivative, salt and the polymer matrix.</P>
Govarthanan, Muthusamy,Selvankumar, Thangasamy,Manoharan, Koildhasan,Rathika, Rajiniganth,Shanthi, Kuppusamy,Lee, Kui-Jae,Cho, Min,Kamala-Kannan, Seralathan,Oh, Byung-Taek Dove Medical Press 2014 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.9 No.-
<P>Synthesis of silver nanoparticles (AgNPs) with biological properties is of vast significance in the development of scientifically valuable products. In the present study, we describe simple, unprecedented, nontoxic, eco-friendly, green synthesis of AgNPs using an Indian traditional farming formulating agent, panchakavya. Silver nitrate (1 mM) solution was mixed with panchakavya filtrate for the synthesis of AgNPs. The nanometallic dispersion was characterized by surface plasmon absorbance measuring 430 nm. Transmission electron microscopy showed the morphology and size of the AgNPs. Scanning electron microscopy–energy-dispersive spectroscopy and X-ray diffraction analysis confirmed the presence of AgNPs. Fourier transform infrared spectroscopy analysis revealed that proteins in the panchakavya were involved in the reduction and capping of AgNPs. In addition, we studied the antibacterial activity of synthesized AgNPs. The synthesized AgNPs (1–4 mM) extensively reduced the growth rate of antibiotic resistant bacteria such as <I>Aeromonas</I> sp., <I>Acinetobacter</I> sp., and <I>Citrobacter</I> sp., according to the increasing concentration of AgNPs.</P>