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Sathish Sundararajan,Balaji Sivaraman,Venkatesh Rajendran,Sathishkumar Ramalingam 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.3
Agrobacterium-mediated genetic transformation method for recalcitrant indica rice cultivars. For this, mature seeds of commercially important indica rice varieties, ASD16, ADT43, IR 64, and Pusa Basmati were cultured on MS and N6 medium supplemented with 2 mg l-1 2, 4-D + 30 g l-1 sucrose. The calli grown in N6 medium showed better friability and embryogenic response. Out of the four varieties tested, ASD16 and IR64 showed better callusing and embryogenic capacity as compared to ADT43 and Pusa Basmati. For genetic transformation studies, embryogenic calli of all the cultivars were co-cultivated with the Agrobacterium tumefaciens strain LBA 4404 harboring the binary vector pCambia 1305.1 with GUS gene. GUS assay was performed for the putative transformed calli and its activity was found to be qualitatively higher in ASD16 and IR64 than the other two varieties. The best responsive ASD16 transformed calli was regenerated and the putative transgenic lines were regenerated. ASD16 transformed calli were confirmed by GUS assay. PCR analysis confirmed the presence of both GUS and HPT genes in ASD16 transgenic lines.
Sathish K.V.,Sridhar K.N.,Seenappa L.,Manjunatha H.C.,Vidya Y.S.,Chinnappa Reddy B.,Manjunatha S.,Santhosh A.N.,Munirathnam R.,Raj Alfred Cecil,Damodara Gupta P.S.,Sankarshan B.M. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
For the first time Aluminium-BariumeZinc oxide nanocomposite (ZABONC) was synthesized by solution combustion method where calcination was carried out at low temperatures (6000 C) to study the electromagnetic (EM) (X/g) radiation shielding properties. Further for characterization purpose standard techniques like PXRD, SEM, UV-VISIBLE, FTIR were used to find phase purity, functional groups, surface morphology, and to do structural analysis and energy band gap determination. The PXRD pattern shows (hkl) planes corresponding to spinel cubic phase of ZnAl2O4, cubic BaðNO3Þ2, a and g phase of Al2O3 which clearly confirms the formation of complex nano composite. From SEM histogram mean size of nano particles was calculated and is in the order of 17 nm. Wood and Tauc’s relation direct energy band gap calculation gives energy gap of 2.9 eV. In addition, EM (X/g) shielding properties were measured and compared with the theoretical ones using standard procedures (NaI (Tl) detector and multi channel analyzer MCA). For energy above 356 keV the measured shielding parameters agree well with the theory, while below this value slight deviation is observed, due to the influence of atomic/crystallite size of the ZABONC. Hence synthesized ZABONC can be used as a shielding material in EM (X/g) radiation shielding
Sathish K. Ponniah,Zhenhua Shang,M. Aydın Akbudak,Vibha Srivastava,Muthusamy Manoharan 한국식물생명공학회 2017 Plant biotechnology reports Vol.11 No.1
Rice straw is one of the largest biomasses in the world that can potentially be exploited for biofuel. Nevertheless, the association of lignin with cellulose and hemicellulose has hindered the efficient utilization of rice straw for cellulosic biofuel. The objective of this study was to down-regulate key genes involved in lignin biosynthesis pathway, such as hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase (HCT), cinnamoyl CoA reductase (CCR), and cinnamyl alcohol dehydrogenase (CAD), through “terminator-less” constructs to reduce lignin in transgenic rice. Real-time qPCR analyses of the selected T1 transgenic rice plants indicated 36–86% transcript reduction in HCT lines, 75–94% in CCR lines, and 10–85% in CAD lines. Of the nine down-regulated lines (three lines from each genes) subjected to lignin analysis, seven showed significant reduction in total lignin content (HCT-4, HCT-7, CAD-1, CAD-7, CCR-3, CCR-7, and CCR-12) with lignin reduction ranging from 4.6 to 10.8%. The results from this study indicated that truncated gene fragments lacking transcription termination sequence can be used for down-regulation of lignin genes in rice, and the rice straw from these transgenic lines could be useful as feedstock for cellulosic biofuel.
Sathish S.,Nirmala R.,Kim Hak Yong,Navamathavan R. 한국탄소학회 2022 Carbon Letters Vol.32 No.5
In preparation of porous carbon materials microwave oven brightening is one of the warming modes used ever. The various procedures that take place in microwave combustion process include carbonization, incitation, and recovery and thus carbon is defined. This paper compares ideal conditions of traditional warming methods, as well as their implementation potential, losses, and specifications. This porous carbon with heat treatment possesses various properties and they are well suited for energy applications which require constrained space such as hydrogen storage in solid-state and supercapacitors. The enhanced properties are chemical and thermal stability, ready availability, low framework density and ease of processability. The recent trend in class of porous carbons is Activated Carbons that are employed traditionally as adsorbents or catalyst supporters but currently, they found potent applications in fabricating for hydrogen storage materials and supercapacitors. These activated carbons are much enhanced form in class of porous carbon materials and they possess the capability to enable hydrogen economy, where the energy carrier is hydrogen. Therefore, the utility of activated carbons as a source for energy storage experiences a rapid growth at current trend and they possess significant advances. This investigation is based on detailed cost development data and electrical imperativeness applications.
Contact analysis of spherical ball and a deformable flat model with the effect of tangent modulus
Sathish Gandhi, V.C.,Ramesh, S.,Kumaravelan, R.,Thanmanaselvi, M. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
The paper is on contact analysis of a spherical ball with a deformable flat, considering the effect of tangent modulus on the contact parameters of a non-adhesive frictionless elastic-plastic contact. The contact analysis of this model has been carried out using analysis software Ansys and Abaqus. The contact parameters such as area of contact between two consecutive steps, volume of bulged material are evaluated from the formulated equations. The effect of the tangent modulus is considered for determining these parameters. The tangent modulus are accounted between 0.1E and 0.5E of materials E/Y value greater than 500 and less than 1750. Result shows that upto an optimal tangent modulus values the elastic core push up to the free surface in the flat. The simulation is also carried out in Abaqus and result provide evidence for the volume of bulged material in the contact region move up and flow into the free surface of the flat from the contact edge between the ball and flat. The strain energy of the whole model is varied between 20 to 40 percentage of the stipulated time for analysis.
Sathish Kumar, Y.,Unnithan, A.R.,Sen, D.,Kim, C.S.,Lee, Y.S. Elsevier 2015 Colloids and surfaces. A, Physicochemical and engi Vol.477 No.-
Electrospinning is a fabrication process that uses an electric field to control the deposition of polymer fibers onto a target substrate. Nanofiber possess the characteristic features of high length-to-diameter ratio and specific surface areas, enabling it to be used for protective clothing, filter, antibacterial membrane, reinforced composite, and tissue engineering. We have adopted a method of direct in situ electrospinning to produce mats composed of the culture filtrate from low shear modeled microgravity (LSMMG) grown Penicillium chrysogenum with a suitable carrier polymer to aid in its electrospinning. The antibacterial activity of the mat is attributed to the presence of penicillin in the culture filtrate. The presence of penicillin was confirmed by using liquid chromatography-mass spectrometry (LC-MS/MS). The mat was found to be effective against gram positive bacteria like Staphylococcus aureus and Enterococcus faecalis. The process, stability and characterization of the biological properties of such nanofibrous scaffolds are demonstrated.