Search Results

You are looking at 1 - 4 of 4 items for

  • Author: M.N.V. Prasad x
Clear All Modify Search
Open access

N. Prasad, M. Krishna and V. Babu Naik

Area Wide Implementation of Insecticide Resistance Management Strategies on bt Cotton - A Case Study in India

Insecticide Resistance Management strategies have been formulated with several cost effective, ecofriendly novel approaches and rotation of insecticides based on resistance data for managing the pest complex for stabilizing the cotton ecosystem and improving the social economic status of the cotton growers. Insecticide Resistance Management (IRM) strategies for managing cotton pest complex revealed that sucking and bollworm complex was lower in IRM fields compared to non IRM fields. The strategic positioning of insecticides coupled with ecofriendly technologies led to abundance of natural enemies in cotton ecosystem in IRM fields, while the incidence of these insects was lower in non IRM fields due to insecticidal sprays. Farmers by adopting IRM strategies realized higher net returns by saving in plant protection cost due to less number of insecticidal sprays and increased seed cotton yield.

Open access

Boda Ravi Kiran and M.N.V. Prasad

Abstract

Lead (Pb) is a major inorganic pollutant with no biological significance and has been a global concern. Phytotoxicity of lead induces toxic effects by generating reactive oxygen species (ROS), which inhibits most of the cellular processes in plants. Hydro-ponic experiments were performed with Ricinus communis to investigate the toxicity and antioxidant responses by exposing to different concentrations of lead (0, 200 and 400 µM) for 10 days. Pb stress caused a significant increase in electrolyte leakage, non-enzymatic antioxidants (phenols and flavonoids) and a decrease in the elemental profile of the plant. Histochemical visualization clearly indicates the significant increase of H2O2 production in dose-dependent manner under Pb stress. Likewise, an increase in catalase, guaiacol peroxidase and superoxide dismutase activity was also evident. Ascorbate peroxidase and MDAR, on the other hand, responded biphasically to Pb treatments showing a decrease in concentration. The decline in redox ratio GSH/GSSG was imposed by the indirect oxidative stress of Pb. Hence these findings showed the ameliorative potential of R. communis to sustain Pb toxicity under oxidative stress.

Open access

M.S.N. Murty, G. Suresh Kumar, B.V. Appa Rao and K.A.S.N.V. Prasad

Abstract

In this paper, we provide a way to combine matrix Lyapunov systems with fuzzy sets to form a new system called fuzzy dynamical matrix Lyapunov system and obtain a suffcient condition for the controllability of this system.

Open access

M.V.S. Murali Krishna, N. Durga Prasada Rao, B. Anjeneya Prasad and P.V.K. Murthy

Abstract

It has been found that the vegetable oils are promising substitute, because of their properties are similar to those of diesel fuel and they are renewable and can be easily produced. However, drawbacks associated with crude vegetable oils are high viscosity, low volatility call for low heat rejection combustion chamber, with its significance characteristics of higher operating temperature, maximum heat release, and ability to handle lower calorific value (CV) fuel etc. Experiments were carried out to evaluate the performance of an engine consisting of different low heat rejection (LHR) combustion chambers such as ceramic coated cylinder head-LHR-1, air gap insulated piston with superni (an alloy of nickel) crown and air gap insulated liner with superni insert - LHR-2; and ceramic coated cylinder head, air gap insulated piston and air gap insulated liner - LHR-3 with normal temperature condition of crude rice bran oil (CRBO) with varied injector opening pressure. Performance parameters (brake thermal efficiency, brake specific energy consumption, exhaust gas temperature, coolant load, and volumetric efficiency) and exhaust emissions [smoke levels and oxides of nitrogen [NOx]] were determined at various values of brake mean effective pressure of the engine. Combustion characteristics [peak pressure, time of occurrence of peak pressure, maximum rate of pressure rise] were determined at full load operation of the engine.

Conventional engine (CE) showed compatible performance and LHR combustion chambers showed improved performance at recommended injection timing of 27°bTDC and recommend injector opening pressure of 190 bar with CRBO operation, when compared with CE with pure diesel operation. Peak brake thermal efficiencyincreased relatively by 7%, brake specific energy consumption at full load operation decreased relatively by 3.5%, smoke levels at full load decreased relatively by 11% and NOx levels increased relatively by 58% with LHR-3 combustion chamber with CRBO at an injector opening pressure of 190 bar when compared with pure diesel operation on CE