Plane-Symmetric Inhomogeneous Bulk Viscous Cosmological Models with Variable Λ\Lambda

A plane-symmetric non-static cosmological model representing a bulk viscous fluid distribution has been obtained which is inhomogeneous and anisotropic and a particular case of which is gravitationally radiative. Without assuming any {\it adhoc} law, we obtain a cosmological constant as a decreasing function of time. The physical and geometric features of the models are also discussed.Comment: 11 page

Mobile Sink Node with Discerning Motility Approach for Energy Efficient Delay Sensitive Data Communication over Wireless Sensor Body Area Networks

The sensors nearby the static sink drains their energy resources rapidly, since they continuously involve to build routes in Wireless sensor networks, which are between data sources and static sink. Hence, the sensors nearby the sink having limited lifespan, which axing the network lifetime.The mobile-sink strategy that allows the sink to move around the network area to distribute the transmission overhead to multiple sensor nodes. However, the mobile-sink strategy is often tall ordered practice due to the continuous need of establishing routes between source nodes and the mobile sink (MS) at new position occurred due to its random mobility. In regard to above stated argument, this manuscript proposed a novel energy data transmission strategy which is effective for WSN with mobile sink. Unlike the traditional contributions, which relies on mobile sink with random mobility strategies, the proposal defines a discerning path for mobile sink routing between sectioned clusters of the WSN. The proposal of the manuscript titled “Mobile Sink Node with Discerning Motility Approach (MSDMA) for Energy Efficient Data Communication over WBAN”. The method defined in proposed model sections the target network in to multiple geographical clusters and prioritize these clusters by the delay sensitivity of the data transmitted by the sensor nodes of the corresponding clusters. Further, discriminating these clusters by their delay sensitive priority to define mobile sink route. For estimation of the delay sensitive priority of the clusters, set of metrics are proposed. The experimental study carried on simulation to assess the significance of the suggested method. The performance improvement of the suggested method is ascended through comparative analysis performed against benchmark model under divergent metrics

Distribution of total petroleum hydrocarbons in water, sediment and its impact on six commercially important fishes of Kundalika estuary, west coast of India

787-794Kundalika estuary, which opens into the Arabian Sea along the west coast of India, receives effluents from industries situated on its bank. The Total Petroleum Hydrocarbons (TPHs) were studied using fluorescence spectrophotometer in water, sediments and fishes along the Kundalika estuary. The values of TPHs varied in water (2.0-19.1μgL-1) and surface sediments (2.1-16.8μgg-1, dry wt) with maximum concentrations recorded in the upstream region. The concentration of TPHs (dry wt) in the sediment cores collected at mouth, middle and upper parts of the estuary ranged 1.4–4.4 μgg-1, 4.5–27.5 μgg-1 and 6.9–29.1μgg-1, respectively. Sediments with higher mud (silt+clay) content showed higher TPHs enrichment due to the larger specific surface area and showed significant positive correlation between mud and TPHs concentrations. The accumulated TPHs values of fin fishes (0.5-2.2μgg-1; wet wt) were lower than hazardous levels, although there was no statistical significance between TPHs and total length and weight of fish

Some Bianchi Type III String Cosmological Models with Bulk Viscosity

We investigate the integrability of cosmic strings in Bianchi III space-time in presence of a bulk viscous fluid by applying a new technique. The behaviour of the model is reduced to the solution of a single second order nonlinear differential equation. We show that this equation admits an infinite family of solutions. Some physical consequences from these results are also discussed.Comment: 12 pages, no figure. To appear in Int. J. Theor. Phy

Determination of spatio-temporal influences on the distribution of fecal indicator organisms along the north-west coast of India

698-706Coastal ecosystem is susceptible to discharge of untreated sewage waste. The present study is aimed to determine water quality status prevailing along the north-west coast of India by monitoring spatial and temporal variations associated with fecal indicator organisms (FIOs) (namely, total coliforms, fecal coliforms, Escherichia coli and Streptococcus fecalis) along the five designated coastal water sites – Veraval, Hazira, Mumbai, Ratnagiri and Malvan for years (2012-14). Spatial waters illustrated that the concentration of FIOs significantly reduced away from the shoreline. Temporal-based sampling elucidates decreasing trend in fecal loads: Monsoon>post-monsoon>pre-monsoon. Based on the resemblance of water quality characteristics applied by hierarchical cluster analysis, these sites were grouped into three categories: Comparatively less polluted, moderately polluted and highly polluted. Regular trends in coastal FIOs variability, collective information about water quality and environmental factors appear useful for monitoring and management towards pollution encumbered at coastal region

A New Class of Inhomogeneous String Cosmological Models in General Relativity

A new class of solutions of Einstein field equations has been investigated for inhomogeneous cylindrically symmetric space-time with string source. To get the deterministic solution, it has been assumed that the expansion ($\theta$) in the model is proportional to the eigen value $\sigma^{1}_{1}$ of the shear tensor $\sigma^{i}_{j}$. Certain physical and geometric properties of the models are also discussed.Comment: 12 pages, no figure. Submitted to Astrophys. Space Sci. arXiv admin note: substantial text overlap with arXiv:0705.090

Bianchi Type-II String Cosmological Models in Normal Gauge for Lyra's Manifold with Constant Deceleration Parameter

The present study deals with a spatially homogeneous and anisotropic Bianchi-II cosmological models representing massive strings in normal gauge for Lyra's manifold by applying the variation law for generalized Hubble's parameter that yields a constant value of deceleration parameter. The variation law for Hubble's parameter generates two types of solutions for the average scale factor, one is of power-law type and other is of the exponential form. Using these two forms, Einstein's modified field equations are solved separately that correspond to expanding singular and non-singular models of the universe respectively. The energy-momentum tensor for such string as formulated by Letelier (1983) is used to construct massive string cosmological models for which we assume that the expansion ($\theta$) in the model is proportional to the component $\sigma^{1}_{~1}$ of the shear tensor $\sigma^{j}_{i}$. This condition leads to $A = (BC)^{m}$, where A, B and C are the metric coefficients and m is proportionality constant. Our models are in accelerating phase which is consistent to the recent observations. It has been found that the displacement vector $\beta$ behaves like cosmological term $\Lambda$ in the normal gauge treatment and the solutions are consistent with recent observations of SNe Ia. It has been found that massive strings dominate in the decelerating universe whereas strings dominate in the accelerating universe. Some physical and geometric behaviour of these models are also discussed.Comment: 24 pages, 10 figure

Generation of Bianchi type V cosmological models with varying Λ\Lambda-term

Bianchi type V perfect fluid cosmological models are investigated with cosmological term $\Lambda$ varying with time. Using a generation technique (Camci {\it et al.}, 2001), it is shown that the Einstein's field equations are solvable for any arbitrary cosmic scale function. Solutions for particular forms of cosmic scale functions are also obtained. The cosmological constant is found to be decreasing function of time, which is supported by results from recent type Ia supernovae observations. Some physical aspects of the models are also discussed.Comment: 16 pages, 3 figures, submitted to CJ

Effect of pyridoxamine on chemical modification of proteins by carbonyls in diabetic rats: characterization of a major product from the reaction of pyridoxamine and methylglyoxal

Abstract Advanced glycation end products (AGEs) from the Maillard reaction contribute to protein aging and the pathogenesis of ageand diabetes-associated complications. The a-dicarbonyl compound methylglyoxal (MG) is an important intermediate in AGE synthesis. Recent studies suggest that pyridoxamine inhibits formation of advanced glycation and lipoxidation products. We wanted to determine if pyridoxamine could inhibit MG-mediated Maillard reactions and thereby prevent AGE formation. When lens proteins were incubated with MG at 37°C, pH 7.4, we found that pyridoxamine inhibits formation of methylglyoxal-derived AGEs concentration dependently. Pyridoxamine reduces MG levels in red blood cells and plasma and blocks formation of methylglyoxallysine dimer in plasma proteins from diabetic rats and it prevents pentosidine (an AGE derived from sugars) from forming in plasma proteins. Pyridoxamine also decreases formation of protein carbonyls and thiobarbituric-acid-reactive substances in plasma proteins from diabetic rats. Pyridoxamine treatment did not restore erythrocyte glutathione (which was reduced by almost half) in diabetic animals, but it enhanced erythrocyte glyoxalase I activity. We isolated a major product of the reaction between MG and pyridoxamine and identified it as methylglyoxal-pyridoxamine dimer. Our studies show that pyridoxamine reduces oxidative stress and AGE formation. We suspect that a direct interaction of pyridoxamine with MG partly accounts for AGE inhibition. Ó 2002 Elsevier Science (USA). All rights reserved