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Search Results: 1 - 10 of 411 matches for " Sagarika Chakrabarty "
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Development of a marketable rice based herbal porridge suitable for diabetics from Scoparia dulcis  [PDF]
Subhashinie Senadheera, Sagarika Ekanayake
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.49B014
Abstract:

Consumption of herbal leafy porridges is a reputed dietary remedy among Sri Lankans in treating diabetes. The aim of the study was to develop a rice based herbal porridge [rice: fresh leaves: scraped coconut kernel 13 - 15: 25 - 30: 10 - 13 (w/w/w)] commercially with Scopariadulcis leaves which has proven antidiabetic effects and low GI (fresh porridge) which benefits diabetics. Two porridges with the same ingredient ratio were produced with different particle sizes. Porridge produced with 100% fine particles (extruded rice, leaves and scraped coconut mixed with rice powder) elicited a high GI for normal (92 ± 22) and diabetic (97 ± 20) subjects. The second porridge prepared with the minimum amount of extruded rice with other ingredients mixed with boiled and dried intact rice grains had a medium GI (normal 58 ± 11, diabetics 61 ± 11). A significant reduction (p < 0.05) in the peak blood glucose was observed in diabetic subjects for porridge 2 (12.4%) compared to porridge 1 (0.7%) when compared to glucose. The reason could be the significantly high (p<0.05) amount of larger particles (>0.5 mm) (63%) and minimum amount of extruded fine particles in porridge 2 compared to porridge 1 (1.3%).

Livestock Antibiotic Effects on Nitrification, Denitrification, and Microbial Community Composition in Soils  [PDF]
Sagarika Banerjee, Elisa D’Angelo
Open Journal of Soil Science (OJSS) , 2013, DOI: 10.4236/ojss.2013.35024
Abstract:

The broiler (Gallus gallus domesticus) industry in the United States and several other countries routinely includes subtherapeutic levels of antibiotics such as roxarsone, virginiamycin, and bacitracin in the feed to improve bird growth yields. Large fractions of the antibiotics fed to the birds are excreted in manure (litter), which is often applied to soils to improve fertility. Some concerns with this practice are antibiotic-induced alterations in microbially-mediated nutrient cycling, which could influence plant productivity and environmental quality. To investigate this possibility, a series of lab experiments were conducted to determine the effects of increasing levels of the three livestock antibiotics on nitrification, denitrification, and microbial community composition (fatty acid methyl ester profiles) of soils collected along a catena. Roxarsone and virginiamycin significantly influenced microbial community composition and inhibited nitrification in the soils, but only at levels that were several-fold higher than expected in poultry litter-applied soils. Bacitracin did not affect microbial growth, microbial community composition, or nitrification at any concentration tested (up to 500 mg·kg-1). None of the antibiotics influenced denitrification at environmentally-relevant concentrations. Amounts of antibiotics in soil solution were greatly reduced by sorption, which followed Freundlich models in the concentration range of 1 - 500 mg·L-1. Results from this study indicated that addition of roxarsone, virginiamycin, or bacitracin to these soils at environmentally-relevant concentrations would not likely impact microbial community composition, nitrification or denitrification due to intrinsic resistance/insensitivity of microorganisms to these antibiotics and reductions in the bioavailable amounts due to sorption by soil surfaces.

New Integrators and Differentiators Using a MMCC  [PDF]
Palaniandavar Venkateswaran, Rabindranath Nandi, Sagarika Das
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.33040
Abstract: Using the new building block Multiplication-Mode Current Conveyor (MMCC), some inverting/non-inverting type integrator and differentiator designs are presented, wherein the time constant (τ) is tuned electronically. The MMCC is implemented by a readily available chip-level configuration using a multiplier (ICL 8013) and a current feedback amplifier (AD-844 IC) CFA. Detailed analysis, taking into account the device non-idealities, had been carried out that indicates slight deviations affecting the values of the nominal time constant but the design is practically insensitive to the port mismatch errors (ε). Satisfactory response on wave conversion, for signal frequencies up to 600 Khz had been verified with both hardware circuit test and PSPICE macromodel simulation.
Selective Filters and Tunable Sinusoid Oscillator Using a CDBA  [PDF]
Rabindranath Nandi, Palaniandavar Venkateswaran, Sagarika Das
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.42030
Abstract:

The realization of some new selective filters using single current differencing buffered amplifier (CDBA) and few RC components is presented. The same topology provides lowpass (LP), bandpass (BP) and highpass (HP) characteristics with appropriate choice and location of the RC components in the circuit. Incorporation of a suitable feedback loop through a voltage buffer unity-gain cell yields a tunable sinusoid oscillator. Effects of the device port mismatch errors (ε) and parasitic z-node capacitance (Cz) of the CDBA element are shown to be insignificant and corresponding sensitivities are extremely low. Satisfactory experimental verifications of the filter quality (Q) and oscillator tuning range (500 KHz ≤ fo ≤ 5 MHz) are carried out.

Complement component C5a Promotes Expression of IL-22 and IL-17 from Human T cells and its Implication in Age-related Macular Degeneration
Baoying Liu, Lai Wei, Catherine Meyerle, Jingsheng Tuo, H Nida Sen, Zhiyu Li, Sagarika Chakrabarty, Elvira Agron, Chi-Chao Chan, Michael L Klein, Emily Chew, Frederick Ferris, Robert B Nussenblatt
Journal of Translational Medicine , 2011, DOI: 10.1186/1479-5876-9-111
Abstract: Human peripheral blood mononuclear cells (PBMCs) were isolated from the blood of exudative form of AMD patients using a Ficoll gradient centrifugation protocol. Intracellular staining and enzyme-linked immunosorbent assays were used to measure protein expression. Apoptotic cells were detected by staining of cells with the annexin-V and TUNEL technology and analyzed by a FACS Caliber flow cytometer. SNP genotyping was analyzed by TaqMan genotyping assay using the Real-time PCR system 7500.We show that C5a promotes interleukin (IL)-22 and IL-17 expression by human CD4+ T cells. This effect is dependent on B7, IL-1β and IL-6 expression from monocytes. We have also found that C5a could protect human CD4+ cells from undergoing apoptosis. Importantly, consistent with a role of C5a in promoting IL-22 and IL-17 expression, significant elevation in IL-22 and IL-17 levels was found in AMD patients as compared to non-AMD controls.Our results support the notion that C5a may be one of the factors contributing to the elevated serum IL-22 and IL-17 levels in AMD patients. The possible involvement of IL-22 and IL-17 in the inflammation that contributes to AMD may herald a new approach to treat AMD.Age related macular degeneration (AMD) is clinically characterized by degenerative changes in the macula, the region of the retina that permits fine central vision. One of the key pathological features of AMD is the development of large drusen, extracellular deposits located between Bruch's membrane and the retinal pigment epithelium (RPE). These large drusen and the associated RPE changes are the major risk factors for the development of advanced AMD, which can be classified into two subtypes: dry (geographic atrophic) and wet (neovascular) [1]. Inflammation has been suggested to play an important role in AMD pathogenesis [2,3].Genetic studies have demonstrated strong associations between AMD and several gene variants in genes coding for complement proteins, including complement factor H
Inverse Bayesian Estimation of Gravitational Mass Density in Galaxies from Missing Kinematic Data  [PDF]
Dalia Chakrabarty, Prasenjit Saha
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.41002
Abstract:

In this paper, we focus on a type of inverse problem in which the data are expressed as an unknown function of the sought and unknown model function (or its discretised representation as a model parameter vector). In particular, we deal with situations in which training data are not available. Then we cannot model the unknown functional relationship between data and the unknown model function (or parameter vector) with a Gaussian Process of appropriate dimensionality. A Bayesian method based on state space modelling is advanced instead. Within this framework, the likelihood is expressed in terms of the probability density function (pdf) of the state space variable and the sought model parameter vector is embedded within the domain of this pdf. As the measurable vector lives only inside an identified sub-volume of the system state space, the pdf of the state space variable is projected onto the space of the measurables, and it is in terms of the projected state space density that the likelihood is written; the final form of the likelihood is achieved after convolution with the distribution of measurement errors. Application motivated vague priors are invoked and the posterior probability density of the model parameter vectors, given the data are computed. Inference is performed by taking posterior samples with adaptive MCMC. The method is illustrated on synthetic as well as real galactic data.

Electronically Tunable Dual-Input Integrator Employing a Single CDBA and a Multiplier: Voltage Controlled Quadrature Oscillator Design
R. Nandi,Mousiki Kar,Sagarika Das
Active and Passive Electronic Components , 2009, DOI: 10.1155/2009/835789
Abstract: A new dual-input differential input active integrator using a current differencing buffered amplifier (CDBA) is proposed. A multiplier element is appropriately used in the circuit whose control voltage () tunes the integrator time constant () electronically. The design of a voltage controlled quadrature oscillator (VCQO) based on the proposed integrator had been satisfactorily implemented. A new type of measurement for the tuning error of the oscillator based on the Nyquist plot is presented that shows an error of only 2% at ≈ 1 MHz with Total Harmonic Distortion (THD) less than 3%.
Synchronous adenocarcinoma and mucosa-associated lymphoid tissue lymphoma of the colon
Devi Padmalaya,Pattanayak Lucy,Samantaray Sagarika
Saudi Journal of Gastroenterology , 2011,
Abstract: Mucosa-associated lymphoid tissue (MALT) tumors are a distinct subtype of non-Hodgkin′s lymphoma. Synchronous appearance of adenocarcinoma and colonic MALT lymphoma in the same patient is quite rare. In the present report, we describe a 68-year-old female who presented with a history of bleeding per rectum. She had no history of fever, loss of weight or drenching night sweats. Rectal examination revealed no abnormality. Colonoscopy showed a large ulceroproliferative mass arising from the hepatic flexure, biopsy of which came out to be adenocarcinoma of colon. A right hemicolectomy was performed and microscopic study revealed the tumor type to be synchronous adenocarcinoma with lymphoma. The final diagnosis of this patient turned out to be a synchronous manifestation of both colonic adenocarcinoma and colonic MALT lymphoma. Although the patient remains asymptomatic two years after surgery, the case highlights the therapeutic dilemma that prevails in the definitive management in such scenarios.
Cellular Automata Rules and Linear Numbers
Birendra Kumar Nayak,Sudhakar Sahoo,Sagarika Biswal
Physics , 2012,
Abstract: In this paper, linear Cellular Automta (CA) rules are recursively generated using a binary tree rooted at "0". Some mathematical results on linear as well as non-linear CA rules are derived. Integers associated with linear CA rules are defined as linear numbers and the properties of these linear numbers are studied.
TETRABUTYLAMMONIUM BROMIDE (TBAB) IS AN IMPORTANT COMPANION IN ORGANIC CHEMISTRY-A REVIEW
RINKU CHAKRABARTY
Indian Streams Research Journal , 2013,
Abstract: (A) Uptake of the reactive gas e.g. Me N on realistic aqueous interface (H2O/D2O) is 3increased in the presence of fulvalic acid and tetrabutyl ammonium mixture due to their strong dopant interaction. (B) The bimetallic aluminium(salen) complex together with tetrabutylammonium bromide act as effective catalyst for the synthesis of cyclic carbonates from epoxides and 2, 3carbon dioxide. Thus the problem of global warming caused by carbon dioxide is somehow controlled as carbon dioxide has been consumed by these reactions.
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