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- 저자 : K.N. Chandrashekara (검색결과 3 건)
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K.N. Chandrashekara,R. Raj Kumar,Vikas Kumar,Dhriti Banerjee,Shantanu Kundu,Biswatosh Ghosh,Kaomud Tyagi 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.3
The tea mosquito bug, Helopeltis theivora Waterhouse (Miridae: Heteroptera) is a polyphagous pest that affects a number of economically important crops in India. Partial sequences of mitochondrial cytochrome c oxidase 1 (mtCOI) were used to study host associated genetic variation on H. theivora collected from tea (Camellia sinensis L.), cashew (Anacardiumoccidentale L.), acalypha (Acalypha indica L.) and cocoa (Theobroma cacao L.). The results suggest that host plants have a significant effect on the genetic variation of bugs collected from two wide geographical locations (South India and North-East India). Haplotyping data analysis of mtCOI reveals six host plant specific haplotypes of H. theivorawith minimumgenetic divergence (0.8%) between two haplotypeswithin tea as compared to other plants (2.6–11.1%). Further phylogenetic (NJ, ML and BA) analysis evidence three host specific distinct clades. The most surprising result that emerged from our studies is the harmony between clustering of H. theivora and host plant phylogeny. The results indicate that host plants do have selection pressure and substantial effect on genetic variation in H. theivora and such adaptive evolution may have repercussions for IPM (Integrated Pest Management) strategies of H. theivora in India.
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Chandrika B.M.,Manjunatha Holaly Chandrashekara Shastry,Sridhar K.N.,Ambika M.R.,Seenappa L.,Manjunatha S.,Munirathnam R.,Lourduraj A.J. Clement 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
Barium Bismuth Oxide Borate (BBOB) has been synthesized for the first time using solution combustion technique. SEM analysis reveal flower shape of the nanoparticles. The formation of the nanoparticles has been confirmed through XRD & FTIR studies which gives the physical and chemical structure of the novel material. The UV light absorption is observed in the range 200e300 nm. The present study highlights the radiation shielding ability of BBOB for different radiations like X/Gamma rays, Bremsstrauhlung and neutrons. The gamma shielding efficiency is comparable to that of lead in lower energy range and lesser than lead in the higher energy range. The bremsstrauhlung exposure constant is comparably larger for BBOB NPs than that of concrete and steel however it is lesser than that of lead. The beauty of BBOB nanoparticles lies in, high absorption of radiations and low emission of secondary radiations when compared to lead. In addition, the neutron shielding parameters like scattering length, absorption and scattering cross sections of BBOB are found to be much better than lead, steel and concrete. Thus, BBOB nanoparticles are highly efficient in absorbing X/Gamma rays, neutrons and bremsstrauhlung radiations
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Green synthesis of Lead–Nickel–Copper nanocomposite for radiation shielding
Chandrika B.M.,Manjunatha Holaly Chandrashekara Shastry,Munirathnam R.,Sridhar K.N.,Seenappa L.,Manjunatha S.,Lourduraj A.J. Clement 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12
For the first time Pb, Ni, and Cu nanocomposites were synthesized by versatile solution combustion synthesis using extract as a reducing agent, to study the potential applications in X-ray/gamma, neutron, and Bremsstrahlung shielding. The synthesized Lead–Nickel–Copper (LNC) nanocomposites were characterized by PXRD, SEM, UV–VIS, and FTIR for the confirmation of successful synthesis. PXRD analysis confirmed the formation of multiphase LNC NCs and the Scherrer equation and the W-H plot gave the average crystal sizes of 19 nm and 17 nm. Surface morphology using SEM and EDX confirmed the presence of LNC NCs. Strong absorption peaks were analyzed by UV visible spectroscopy and the direct energy gap is found to be 3.083 eV. Functional groups present in the LNC NCs were analyzed by FTIR spectroscopy. X-ray/gamma radiation shielding properties were measured using NaI(Tl) detector coupled with MCA. It is found to be very close to Pb. Neutron shielding parameters were compared with traditional shielding materials and found LNC NCs are better than lead and concrete. Secondary radiation shielding known as Bremsstrahlung shielding characteristics also studied and found that LNC NCs are best in secondary radiation shielding. Hence LNC NCs find shielding applications in ionizing radiation such as X-ray/gamma and neutron radiation
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