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Thangavelu, M.,R. Narasimha, R.,Adithan, A.,A., C.,Jong-Hoon, K.,Thotapalli Parvathaleswara, S. Elsevier 2016 Colloids and Surfaces B Vol.143 No.-
<P>Composite scaffolds of nano-hydroxyapatite with demineralized bone matrix were prepared and they were graft copolymerized for better bone regeneration and drug delivery applications. The graft copolymers were characterized for their physiochemical properties using conventional methods like FTIR, TGA, XRD and SEM. The scaffolds were seeded with 3T3 and MG63 cells for studying their biocompatibility and their temporal expression of ALP activity, the rate of calcium deposition and their gene expression of collagen type I (Coll-1), osteopontin (OP), osteonectin (ON), and osteocalcin (OC) were studied. In vivo studies were conducted using sub-cutaneous implantation models in male Wister rats for 6 months. Periodic radiography and post-autopsy histopathology was analysed at 15 days, 1, 2, 3, 4, 5, and 6 months. The obtained in vitro results clearly confirm that the bone scaffolds prepared in this study are biocompatible, superior osteoinductivity, capable of supporting growth, maturation of MG 63 osteoblast like cells; the gene expression profile revealed that the material is capable of supporting the in vitro growth and maturation of osteoblast-like cells and maturation. The in vivo results stand a testimony to the in vitro results in proving the biocompatibility and osteoinductivity of the materials. (C) 2016 Elsevier B.V. All rights reserved.</P>
Development of New Robust Bivoltine Silkworm Hybrid $SR2{\times}SR5$ for Rearing throughout the Year
Rao, P. Sudhakara,Nayaka, A. R. Narasimha,Mamatha, M.,Sowmyashree, T. S.,Bashir, Ifat,Ilahi, Irfan Korean Society of Sericultural Science 2007 International Journal of Industrial Entomology Vol.14 No.2
A Silkworm breeding programme was designed to develop a robust but productive bivoltine silkworm hybrid of Bombyx mori L. suitable for rearing throughout the year in tropical climate by utilizing indigenous polyvoltine and productive bivoltine breeds. The breeding was carried out under high temperature ($36^{\circ}C{\pm}1^{\circ}C$) and low humidity ($50{\pm}5%$) conditions in the environmental chamber. By $F_{12}$, three oval and three dumbbell breeds were isolated with higher survival and productive merits. These breeds were utilized in the hybrid evaluation along with other popular breeds. Based on combining ability test results, the hybrid $SR_2{\times}SR_5$ was selected for large scale testing and evaluated in different seasons. The evaluation studies indicated that the hybrid has higher viability and productive merits and it is suitable to rear throughout the year. The hybrid $SR_2{\times}SR_5$ recorded a survival of 92.0%, cocoon shell weight of 0.417 g, cocoon shell percentage of 23.0 and a filament length of 1042 meters under hot and dry conditions of environmental chamber compared to the control thermo-tolerant hybrid $CSR18{\times}CSR19$.
Abdul Kadar C. H,Muhammad Faisal,N. Maruthi,Narasimha Raghavendra,B. P. Prasanna,S. R. Manohara 한국고분자학회 2022 Macromolecular Research Vol.30 No.9
This paper presents the suitability of polyaniline/zinc tungstate (PANI/ ZnWO4) nanocomposites with tunable electrical properties for a range of multifunctional applications. In-situ oxidative polymerization method was employed to synthesize the PANI/ZnWO4 nanocomposites with different mass percentages of the dispersant ZnWO4 (10%, 20%, 30%, and 40%). The structural features of the samples were analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy, and Raman spectroscopy techniques. Frequency-dependent electrical conductivity studies and dielectric responses were investigated for PANI/ZnWO4 nanocomposites in the range of 100 Hz - 1 MHz. PANI/ZnWO4 nanocomposites showed tunability in the observed high dielectric constant owing to the conductivity relaxation with varying dispersant concentrations. The electromagnetic interference shielding effectiveness (EMI-SE) of the PANI/ZnWO4 nanocomposites were found to be increased from -14 dB to -21 dB with enhancing wt% of ZnWO4 in the PANI matrix. The composite samples displayed practically relevant shielding effectiveness in the entire microwave, Xband covering 8 to 12 GHz. The overall attenuation of the incident EM energy was around 99%, which is highly suitable for diverse EMI shielding applications. The nature of mild steel (MS) metal corrosion in 5 M HCl solution in the unprotected and protected system was studied by using SEM, AC impedance spectroscopy, potentiodynamic polarization (Tafel plots), and atomic absorption spectroscopy (AAS) techniques. The preliminary results indicate the mixed-type anticorrosion behavior. The AAS, AC impedance spectroscopy, and SEM results support the potentiodynamic polarization results.
Kar, Mithilesh,Rao, P. Sudhakara,Kishore, S.,Kumar, T. Selva,Gopal, Nisha,Nayaka, A.R. Narasimha,Chandrasekaran, K. Korean Society of Sericultural Science 2009 International Journal of Industrial Entomology Vol.18 No.1
A study has been made to know the effect of a phytoecdysteroid 'Sampoorna' on uniform maturation of silkworms during spinning and its effect on diseased silkworms infected by major silkworm disease viruses, Bombyx mori nuclear polyhedrosis virus (BmNPV) and Bombyx mori infectious flacherie virus (BmIFV). In the present investigation, the effect of the phytoecdysteroid "Sampoorna" on Grasserie disease caused by BmNPV have shown an average cocoon melting of 11.91% with a disease incidence of 5.83%. The values of 't' test for different treatments of BmNPV indicated low survival rate and cocoon traits were drastically reduced. Another major disease Flacherie caused by BmIFV has shown considerable levels of larval disease incidence (22-32%) and cocoon melting (3-7.67%) with an average melting of 12.95% and 20.24% disease incidence. There is a drastic reduction in survival rate, cocoon yield and other economic traits. The control batches were indicated negligible values for disease incidence and cocoon melting with Sapoorna application and without the inoculation of the two disease-causing viruses. The application of Sampoorna on already infected batches with major pathogens triggered high mortality and disease incidence and melting percentage was also significantly increased with reduced economic traits. Hence, it is suggested that application of Sampoorna in infected batches should be done only in the extreme conditions of rearing. Application of Sampoorna on healthy batches led to uniform maturation and improvement in productivity with the added advantage of better quality cocoons and labour saving.
Mithilesh Kar,P. Sudhakara Rao,S. Kishore,T. Selva Kumar,Nisha Gopal,A. R. Narasimha Nayaka,K. Chandrasekaran 한국잠사학회 2009 International Journal of Industrial Entomology Vol.18 No.1
A study has been made to know the effect of a phytoecdysteroid `Sampoorna` on uniform maturation of silkworms during spinning and its effect on diseased silkworms infected by major silkworm disease viruses, Bombyx mori nuclear polyhedrosis virus (BmNPV) and Bombyx mori infectious flacherie virus (BmIFV). In the present investigation, the effect of the phytoecdysteroid "Sampoorna" on Grasserie disease caused by BmNPV have shown an average cocoon melting of 11.91% with a disease incidence of 5.83%. The values of `t` test for different treatments of BmNPV indicated low survival rate and cocoon traits were drastically reduced. Another major disease Flacherie caused by BmIFV has shown considerable levels of larval disease incidence (22-32%) and cocoon melting (3-7.67%) with an average melting of 12.95% and 20.24% disease incidence. There is a drastic reduction in survival rate, cocoon yield and other economic traits. The control batches were indicated negligible values for disease incidence and cocoon melting with Sapoorna application and without the inoculation of the two disease-causing viruses. The application of Sampoorna on already infected batches with major pathogens triggered high mortality and disease incidence and melting percentage was also significantly increased with reduced economic traits. Hence, it is suggested that application of Sampoorna in infected batches should be done only in the extreme conditions of rearing. Application of Sampoorna on healthy batches led to uniform maturation and improvement in productivity.