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STUDY ON ENDOCRINOLOGICAL PROFILE OF HIV INFECTED MALE PATIENTS FROM EASTERN INDIA
Mandal Sanjay K,Paul Rudrajit,Bandyopadhyay Dipanjan,Basu Asish K
International Research Journal of Pharmacy , 2013, DOI: 10.7897/2230-8407.04347
Abstract: Human Immunodeficiency virus (HIV) infectionis associated with a variety of endocrine problems. Hypoadrenalism, hypothyroidism and hypogonadism are commonly found singly or in combination. Especially, male hypogonadism is very common in this population and may lead to weight loss, lethargy and other co morbidities. We undertook this cross sectional observational study to evaluate endocrine profile in HIV infected males in a sample Eastern Indian population. We also studied for any correlation of the endocrine dysfunctions with their immune status. We studied the blood hormone profiles along with blood CD4 counts. The bloods were drawn in fasting state and analysed using suitable high sensitivity assays. Standard statistical methods were used. We had 48 patients in our study. Among them, 33% had hypogonadism, 20% had hypothyroidism and 15 patients had diabetes. The hypogonadism was mainly hypogonadotropic. In other studies across the globe also, hypogonadism in HIV positive males is found to be significant. Our diabetic patients were not on protease inhibitors. We found some patients who had multiple endocrine dysfunctions. HIV infection is often associated with endocrine abnormalities. This aspect of the disease must be addressed during routine care of these patients. Hormone replacement must be individualized and may be needed for prolonged periods.
AN EFFICIENT METHOD OF MOBILE IP BASED HANDOFF MECHANISM FOR WLAN-GPRS INTEGRATED NETWORK
Sibaram Khara,,Asish K. Mukhopadhyay
Journal of Theoretical and Applied Information Technology , 2007,
Abstract: This paper proposes a new technique for Mobile IP (MIP) registration by WLAN host (WH) of the Internet through GPRS network. The home agent (HA) of WH resides in the Internet. The gateway GPRS Support Node (GGSN) provides foreign agent (FA) functionality for WH in GPRS. After successful attachment with GPRS network in roaming scenario, WH needs two mandatory passes for MIP registration with HA. In first pass, it establishes PDP context in GPRS network and in second pass, it sends MIP registration request to FA at GGSN. This two-pass registration causes substantial delay for handoff from WLAN to GPRS. To minimize this delay, we propose a one-pass MIP registration technique through GPRS network by modifying the activate-PDP-context request (APCR) message. In this scheme, the APCR message carries MIP-registration request in its information field to GGSN. Therefore, FA at GGSN can process MIP registration packet before completion of PDP context in GPRS network. Thus, both PDP context creation and MIP registration are accomplished in one pass of signaling. This technique reduces handoff delay from WLAN to GPRS minimizing the control signals. We observed from simulation results that the proposed one-pass technique reduces handoff delay by 18% compared to that of two-pass method proposed in [8]
Structural, Magnetic and Electron Transport Properties of Ordered-Disordered Perovskite Cobaltites
Asish K. Kundu,B. Raveau
Physics , 2010,
Abstract: Rare earth perovskite cobaltites are increasingly recognized as materials of importance due to rich physics and chemistry in their ordered-disordered structure for the same composition. Apart from colossal magnetoresistance effect, like manganites, the different forms of cobaltites exhibit interesting phenomena including spin, charge and orbital ordering, electronic phase separation, insulator-metal transition, large thermoelectric power at low temperature. Moreover, the cobaltites which display colossal magnetoresistance effect could be used as read heads in magnetic data storage and also in other applications depending upon their particular properties. The A-site ordereddisordered cobaltites exhibit ferromagnetism and metal-insulator transitions as well as other properties depending on the composition, size of A-site cations and various external factors such as pressure, temperature, magnetic field etc. Ordered cobaltites, having a 112-type layered structure, are also reported to have an effectively stronger electron coupling due to layered A-site cationic ordering. Most importantly for the present article we focus on La-Ba-Co-O based ordered-disordered perovskite phases, which exhibit interesting magnetic and electron transport properties with ferromagnetic transition, TC ~ 177K, and it being the first member of lanthanide series. Zener double exchange mechanism considered to be crucial for understanding basic physics of the ferromagneticmetallic phase, yet does not explain clearly the insulating-type phase. In terms of electron transport the ferromagnetic-metallic or insulating/semiconducting states have been discussed in the present article with different types of hopping model.
Coherent stochastic resonance in one dimensional diffusion with one reflecting and one absorbing boundaries
Asish K. Dhara,Tapan Mukhopadhya
Physics , 2000,
Abstract: It is shown that the single-step periodic signal (periodic telegraph signal) can not produce coherent stochastic resonance for diffusion on a segment with one absorbing and one reflecting end points while the multi-step periodic signal does. The general features of this process are exihibited. The resonant frequency is found to decrease and the mean first passage time at resonant frequency increases linearly, as we increase the length of the medium. The cycle variable is shown to be the proper argument to express the first passage time density function at resonance. A formula for first passage time density function at resonance is derived in terms of two universal functions, which clearly isolates its dependence on the length of the medium.
Coherent stochastic resonance in the case of two absorbing boundaries
Asish K. Dhara,Tapan Mukhopadhyay
Physics , 1999, DOI: 10.1103/PhysRevE.60.2727
Abstract: The coherent stochastic resonance is observed and studied with multi-step periodic signal in continuous medium having two absorbing boundaries. The general features of this process are exihibited. The universal features at the resonance point are demonstrated. The kinetic behaviors around the resonance point are also presented.
Application of Multiple Linear Regression and Manova to Evaluate Health Impacts Due to Changing River Water Quality  [PDF]
Sudevi Basu, K. S. Lokesh
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.55076
Abstract:

Rivers are important systems which provide water to fulfill human needs. However, excessive human uses over the years have led to deterioration in quality of river causing, causing health problems from contaminated water. This study focuses on the application of statistical techniques, Multiple Linear Regression model and MANOVA to assess health impacts due to pollution in Cauvery river stretch in Srirangapatna. In this study, using Multiple Linear Regression, it is found that health impact level is 60.8% dependent on water quality parameters of BOD, COD, TDS, TC and FC. The t-statistics and their associated 2-tailed p-values indicate that COD and TDS produces health impacts compared to BOD, TC and FC, when their effects are put together across all the six sampling stations in Srirangapatna. Further Pearson correlation Matrix shows highly significant positive correlation amongst parameters across all stations indicating possibility of common sources of origin that might be anthropogenic. Also graphs are plotted for individual parameters across all stations and it reveals that COD and TDS values are significant across all sampling stations, though their values are higher in impact stations, causing health impacts.

Dissipative dynamics of fission in the framework of asymptotic expansion of Fokker-Planck equation
Asish K. Dhara,Sailajananda Bhattacharya,Kewal Krishan
Physics , 2000, DOI: 10.1007/s100500050383
Abstract: The dynamics of fission has been formulated by generalising the asymptotic expansion of the Fokker-Planck equation in terms of the strength of the fluctuations where the diffusion coefficients depend on the stochastic variables explicitly. The prescission neutron multiplicities and the mean kinetic energies of the evaporated neutrons have been calculated and compared with the respective experimental data over a wide range of excitation energy and compound nuclear mass. The mean and variance of the total kinetic energies of the fission fragments have been calculated and compared with the experimental values.
Features of first passage time density function for coherent stochastic resonance in the case of two absorbing boundaries
Asish K. Dhara,S. R. Banerjee
Physics , 2000,
Abstract: Coherent stochastic resonance is explained in terms of first passage time density functions. Scaling relation between first passage time density functions at resonance for different lengths of the medium is obtained. A formula for first passage time density function at resonance is derived in terms of two universal functions, which demonstrates the universal feature of coherent stochastic resonance. A simple approximate expression for first passage time density function at resonance is proposed which is shown to explain the behavior at resonance fairly accurately.
Synchronization under periodic modulation of potential wells in a two-state stochastic system
Asish K. Dhara,S. R. Banerjee
Physics , 1999,
Abstract: We analyse the effect of synchronization between noise and periodic signal in a two-state spatially extended system analytically. Resonance features are demonstrated. To have the maximum cooperation between signal and noise, it is shown that noise strength at resonance should increase linearly with the frequency of the signal. The time scale of the process at resonance is also shown to increase linearly with the period of the signal.
Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals
S. Basu,P. K. Basu
Journal of Sensors , 2009, DOI: 10.1155/2009/861968
Abstract: Methane is an important gas for domestic and industrial applications and its source is mainly coalmines. Since methane is extremely inflammable in the coalmine atmosphere, it is essential to develop a reliable and relatively inexpensive chemical gas sensor to detect this inflammable gas below its explosion amount in air. The metal oxides have been proved to be potential materials for the development of commercial gas sensors. The functional properties of the metal oxide-based gas sensors can be improved not only by tailoring the crystal size of metal oxides but also by incorporating the noble metal catalyst on nanocrystalline metal oxide matrix. It was observed that the surface modification of nanocrystalline metal oxide thin films by noble metal sensitizers and the use of a noble metal catalytic contact as electrode reduce the operating temperatures appreciably and improve the sensing properties. This review article concentrates on the nanocrystalline metal oxide methane sensors and the role of noble metals on the sensing properties.
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