44 research outputs found
Entomopathogenic Fungi for the Management of Calopepla leayana on Gmelina arborea
No full textEntomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae were isolated and identified as natural pathogens of Calopepla leayana. Both the species of fungi were effective against the larval and adult stages of C. leayana causing white and green muscardine diseases respectively. It was also found that B. bassiana was more pathogenic to the pest as compared to M. anisopliae. The susceptibility of larvae and adults was negatively associated with the age and positively associated with the fungal spore concentration. In all the stages from I instar to adult, the highest mortality was observed in 10% of 1x109 spores/ml concentration of B. bassiana among 1, 2.5, 5 & 10% of 1x109 spores/ml concentration. It was also reflected in probit analysis that the concentration of spores required to kill fifty percent of the population was ranges from 0.09% to 5.98% of 1x109 spores/ml concentration of B. bassiana and 1.02% to 9.72% of 1x109 spores/ml concentration of M. anisopliae. The larvae of I instar have shown highest mortality, which gradually decreased with the increase in age or decrease in the concentration of fungal spores. Mass production of B. bassiana using different substrates was attempted to harvest ample amount of spores. This study revealed that spore production was directly proportional to the mycelial weight and incubation period. From the seven substrates tested, wheat flour was identified as one of the suitable substrates for the mass production of B. bassiana. A field trial was conducted to test their efficacy under field conditions. 72-93% mortality was observed in field conditions.-----------------------------------------------------------------------------------------------------Division of Bioprospecting, Institute of Forest Genetics and Tree Breeding, Coimbatore-641002, Tamilnadu, India*Corresponding author, Email: [email protected] This Article As: N. Senthilkumar and S. Murugesan. 2010. Entomopathogenic Fungi for the Management of Calopepla leayana on Gmelina arborea. J. Ecobiotechnol. 2(3): 01-0
An analysis on problems in implementing nais (national agriculture insurance scheme) with special reference to erode block
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Crystal growth, piezoelectric, non-linear optical and mechanical properties of lithium hydrogen oxalate monohydrate single crystal
No full textBarA-UvrY two-component system regulates virulence of uropathogenic E. coli CFT073.
No full textUropathogenic Escherichia coli (UPEC), a member of extraintestinal pathogenic E. coli, cause ∼80% of community-acquired urinary tract infections (UTI) in humans. UPEC initiates its colonization in epithelial cells lining the urinary tract with a complicated life cycle, replicating and persisting in intracellular and extracellular niches. Consequently, UPEC causes cystitis and more severe form of pyelonephritis. To further understand the virulence characteristics of UPEC, we investigated the roles of BarA-UvrY two-component system (TCS) in regulating UPEC virulence. Our results showed that mutation of BarA-UvrY TCS significantly decreased the virulence of UPEC CFT073, as assessed by mouse urinary tract infection, chicken embryo killing assay, and cytotoxicity assay on human kidney and uroepithelial cell lines. Furthermore, mutation of either barA or uvrY gene reduced the production of hemolysin, lipopolysaccharide (LPS), proinflammatory cytokines (TNF-α and IL-6) and chemokine (IL-8). The virulence phenotype was restored similar to that of wild-type by complementation of either barA or uvrY gene in trans. In addition, we discussed a possible link between the BarA-UvrY TCS and CsrA in positively and negatively controlling virulence in UPEC. Overall, this study provides the evidences for BarA-UvrY TCS regulates the virulence of UPEC CFT073 and may point to mechanisms by which virulence regulations are observed in different ways may control the long-term survival of UPEC in the urinary tract
A simple VOF-CSF multi-fluid flow solver
No full textA Volume of Fluid (VOF)-Youngs model for the solution of an incompressible immiscible two-phase flows is presented. The solver computes the flow field by solving the family of Navier Stokes equations using SIMPLE algorithm and tracks the position of interface between two fluids with different fluid properties by Piecewise Linear Interface Construction (PLIC) Method. The suitability of the SIMPLE type implementation is assessed by investigating the dynamics of air bubbles in water and comparing results with predictions achieved by the FLUENT CFD software
Simulation modelling and thin layer drying kinetics of untreated pineapple using modified hybrid solar dryer with thermal storage
No full textEnergy utilization is an important indication of economic growth and has been directly related to energy consumption. In tropical countries like India, post-harvest losses on fresh perishable fruits are significant, resulting in recurring seasonal shortages. As a result, a modified evacuated tube collector (ETC) based hybrid photovoltaic thermal (PVT) passive-mode solar dryer equipped with sensible thermal storage material shortly called Modified Hybrid Solar Dryer (MHSD), is developed as a potential low-cost technology alternative for drying fruits in Southern region of India. This research compares the drying performance of MHSD and forced convection solar dryer (FCSD) dryers to that of the standard open sun drying (OSD) technique. Compared to the OSD technique, the economic performance of the MHSD and FCSD dryers is examined. The initial moisture content of pineapple slices is determined to be 91 % (wb). The safe moisture content is achieved in 8 h utilizing MHSD coupled with sensible heat storage material (SHSM), while FCSD and sun drying required 19 and 32 h, respectively. The introduction of SHSM improves the drying potential, resulting in a significant reduction in drying time. According to the statistical analysis of the data, the Midilli et al. model is determined to be the best fit to represent the drying kinetics of untreated pineapple slices in a modified hybrid solar dryer with SHSM, FCSD, and open sun drying. The experiment is conducted on three different drying techniques. The MHSD dryer utilises freely-available solar energy to dry the fruit crops. In contrast, the Forced Convection Solar Dryer (FCSD) uses both solar photovoltaic and electricity sources. The results showed that solar-dried pineapple in MHSD with SHSM is more effectively preserved without losing size, shape, colour, appearance, texture, flavour, and quality than solar-dried pineapple in FCSD or sun-dried pineapple pulp. The economic study of an ETC-based hybrid PVT passive-mode solar dryer with SHSM yields a payback period of two years, which is extremely short given the 25-year lifespan
Research Trends of Chennai Mathematical Institute (CMI) during 2005-2019: A Study reflected on Web of Science data base
No full textThe present study examines the publication pattern of Chennai Mathematical Institute (CMI) during 2005 - 2019 using Web of Science (WOS) database from Clarivate Analytics. 632 articles were published during the study period, more number of articles published in 2019 with 94 (14.87%) and highest number of papers published in physical review letters journal which havs more h-index (567), average annual growth rate of CMI publications was 18.48. Researchers are interested with joint authorship rather than solo authorship pattern. Arun K G is the most prolific author with 94 records and USA is the top collaborative country for CMI with 164(25.95%) records
ANALYSIS OF WORKFLOW ON DESIGN PROJECTS IN INDIA
No full textProposal: The increase in privately funded infrastructure construction in India had compelled project owners to demand highly compressed project schedules due to political risks and early revenue generation. As a result, many of the contracts are based on EPC (Engineering Procurement and Construction) contract enabling the contractor to plan and control the EPC phases. Sole responsibility for the three phases has facilitated the use of innovative approaches such as fast-track construction and concurrent engineering in order to minimize project duration.
As a part of a research study to improve design processes, the first author spent a year as an observer in two design projects which was done by a leading EPC contractor in India. Both projects required accelerated design and fast-track construction. The first project involved the detailed design of a coal handling unit for a power plant and second the preliminary phase of a large airport design project. The research team had the mandate to analyze the design process and suggest changes to make it more efficient.
On the first project, detailed data on the design/drawing workflow was collected and analyzed. The paper presents the analysis of the data identifying the bottlenecks in the process and compares the analysis results with the perceptions of the design team. On the second project, the overall organizational structure for coordinating the interfaces between the design processes was evaluated. The paper presents a structured method to organize the interface and interactions between the various design disciplines. The details of the method proposed, implementation issues and outcomes of implementation are also discussed
