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Vasudevan A.,Selvaraj N.,Ganapathi A.,Anbazhagan V. Ramesh,Choi, C.W. The Korean Society of Plant Biotechnology 2006 식물생명공학회지 Vol.33 No.4
Effects of ethylene inhibitors like silver nitrate $(AgNO_3)$, cobalt chloride $(CoCl_2)$ and Salicylic acid (SA) on multiple shoot induction and their impact on ethylene production using embryonal cotyledon cultures of Cucumis sativus L. were examined. The optimum concentration of $AgNO_3\;(40{\mu}M),\;CoCl_2\;(20{\mu}M)\;and\;SA\;(20{\mu}M)$, separately, induced maximum number of shoots on Murashige and Skoog's (MS) medium supplemented optimally with $4.44{\mu}M$ BA and $0.25{\mu}M$ NAA. Among the three ethylene inhibitors tested, $AgNO_3$ produced maximum number of shoots when compared to $CoCl_2$ and SA Ethylene production was monitored in all the treatments with $AgNO_3/CoCl_2/SA$ and it was observed that the treatment with $AgNO_3$ alone showed increase in ethylene production when compared to $CoCl_2$ and SA Even though ethylene concentration was the highest in $AgNO_3$ treated explants, maximum number of shoots was obtained.
COVERING CHARACTERIZATION OF LOCALLY UNIFORM SPACES
Vasudevan, R.,Goel, C.K. Department of Mathematics 1978 Kyungpook mathematical journal Vol.18 No.1
In this paper locally uniform spaces have been characterized through covers. It has been shown that both the approaches are equivalent.
Vasudevan Venkatachalam,Sathish Dorairaj,Ajithan Chandrasekaran,Sathish Selvam,Manickavasagam Markandan 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.4
The production of transgenic watermelon through Agrobacterium tumefaciens-mediated transformation with in vitro regen- eration system is a time-consuming, labor-intensive and genotype-dependent process. To acquire large number of transgenic watermelons in a shorter period of time, the half-seed explants were infected with Agrobacterium strain EHA 105 harboring pCAMBIA1301 with bar and gus genes. The factors affecting in planta transformation efficiency, such as co-cultivation duration, acetosyringone concentration, sonication duration and vacuum infiltration were assessed in the present study. The half-seed explants were sonicated for 3 min and 2 min vacuum infiltrated in Agrobacterium suspension and co-cultivated for 3 days with 100 µM acetosyringone showed maximum transformation efficiency. The transformed watermelon plants were selected against BASTA® and GUS, PCR, Southern hybridization analysis confirmed the transgene integration. The amenability of this established protocol was analyzed on four genotypes, in which the response of all genotypes was posi- tive, whereas Arka manik showed the higher transformation efficiency of 17%. The transformation protocol developed in the present study is efficient, economical and expeditious without the taking part of any tissue culture phases and produce a large number of transgenic lines within a short period of 56 days.
A Decoupled Approach to the Situation of Converter Controlled Induction Machine Drive Dynamics
Vasudevan, Krishna,Rao, P.Sasidhara The Korean Institute of Electrical Engineers 1997 Journal of Electrical Engineering and Information Vol.2 No.4
A unified, modular and decoupled approach for the simulation of converter fed induction machine systems is presented. The system under consideration could have semiconductor devices connected to the stator or the rotor of the induction machine for the purpose of controlling its performance. The machine model, however is invariant to these aspects. The model spans the circuit and equation domains of description thus allowing he advantages of both these domains of descriptions to be utilized. The results obtained using this machine and switch model for a VSI fed induction machine (stator fed, rotor shorted0 are compared with those from laboratory experiment to establish the validity and accuracy of th approach. Results for a slip energy recovery system are also presented and compared with those of earlier workers to establish the performance of the models and algorithms in he doubly-fed mode of operation of induction machine systems.
Synthesis, Optical and Electrical Studies of Nonlinear Optical Crystal: L-Arginine Semi-oxalate
Vasudevan, P.,Sankar, S.,Jayaraman, D. Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
L-Arginine semi-oxalate (LASO) single crystal has been grown by solution growth technique at room temperature. The crystal structure and lattice parameters were determined for the grown crystal by single crystal X-ray diffraction studies. Photoluminescence studies confirm the violet fluorescence emission peak at 395 nm. Optical constants like band gap, refractive index, reflectance, extinction coefficient and electric susceptibility were determined from UV-VIS-NIR spectrum. The dielectric constant, dielectric loss and ac conductivity of the compound were calculated at different temperatures and frequencies to analyze the electrical properties. The solid state parameters such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Nonlinear optical property was discussed to confirm the SHG efficiency of the grown crystal.
Quasi-Symmetric Wheatstone Bridge Zinc Oxide Nanorod UV Detectors
Vasudevan, Arun,Soyoun Jung,Taeksoo Ji,Ang, Simon S. IEEE 2014 IEEE SENSORS JOURNAL Vol.14 No.9
<P>Zinc oxide (ZnO) nanorod-based ultraviolet (UV) detectors have high responsivity at room temperature due to carrier generation assisted by the depletion region formed by oxygen adsorbed on the surface of nanorods. As such, the amount of oxygen adsorbed on the ZnO nanorod surface and the number of electron-hole pairs that reaches the depletion region on the surface can change the response of the detector. In this paper, the transient responses of metal-semiconductor-metal ZnO nanorod-based UV detectors based on a quasi-symmetric Wheatstone bridge configuration were investigated. Responsivity, defined as the ratio of the Wheatstone bridge detector output current to the total power of the UV light incident on the active area of the detector, as high as 54 A/W was obtained in some of these UV detectors at 30 °C. It was found that the responsivity and the temperature effects on the UV response of the Wheatstone bridge ZnO nanorod UV detectors can be tailored by the difference in the diameters and lengths of the rods grown in the two quadrants.</P>