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Articles by N. Joshi
Total Records ( 2 ) for N. Joshi
  N. Joshi , A. Ravindran and V. Mahajan
  Genetic improvement of onion (Allium cepa L.) by conventional methods of hybridization is slow due to its highly heterozygous, outcrossing and biennial nature. To augment this process induced mutagenesis could serve as a useful tool. Keeping this in view, the present study was conducted to test the efficacy of Ethyl Methane Sulphonate (EMS) and Sodium Azide (SA) in inducing variability in onion. For this purpose, seeds of six onion varieties were soaked in solutions of different concentrations of EMS (0.1, 0.15, 0.2, 0.25%) and SA (0.1, 0.3, 0.5, 0.7%) for 4 h and their sensitivity towards these mutagens was assessed in terms of seed germination and seedling growth. Significant differences (p<0.01) were observed in the varieties and treatments with respect to the traits studied. Lower dose (0.1%) of both SA and EMS showed stimulatory effect on germination potential of seeds of all except variety-4 and variety-5. Shoot length was enhanced over control in variety-3 and variety-5 at 0.1% SA and variety-4 at 0.1% EMS. Root length was slightly higher than control in variety-3 and variety-4 at 0.1% SA and 0.1% EMS, respectively. Reduction in all the three traits was observed at higher doses of EMS and SA in all the varieties. The reduction in shoot and root length was more pronounced under SA treatment than EMS. Also, germination process was more sensitive to mutagens than the seedling growth. The present study demonstrated that both mutagens at low dose could be suitable for the creation of variability in onion.
  O.G. Penyazkov , K.L. Sevrouk , V. Tangirala and N. Joshi
  Oxidation of ethylene/air mixtures has been investigated behind reflected shock waves in a shock tube of 76 mm in diameter. Experiments were performed within the temperature range of 1060–1520 K, pressures of 5.9–16.5 atm, and stoichiometries of Φ = 0.5, 1.0, and 2.0. Emissions of OH (308.9 nm), CH (431.5 nm) and C2 (516.5 nm) molecules, pressures and ion current records were implemented to measure ignition times of the mixture along the centreline of the tube and in the boundary layer. Empirical correlations for ethylene ignition times have been deduced from the experimental data. Auto-ignition modes (strong, transient and weak) and ignition limits of the mixtures were identified comparing velocities of reflected shock wave and reaction front at different locations from the reflecting wall. Extensive database for validations of high-temperature ethylene reaction mechanism and numerical methods for reaction flow simulations has been obtained from experimental observations.
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