Goālpāra, India
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Kalita H.,Institute of Advanced Study in Science and Technology | Boruah D.C.,Goalpara College | Deori M.,Institute of Advanced Study in Science and Technology | Hazarika A.,Institute of Advanced Study in Science and Technology | And 5 more authors.
Frontiers in Pharmacology | Year: 2016

Folklore studies have revealed that Musa balbisiana Colla (MB; Family: Musaceae) has high medicinal properties. The purpose of the present study is to evaluate antihyperglycemic, and antioxidant activity of MB extracts in streptozotocin (STZ) induced diabetic rats. In vitro antioxidant and antidiabetic activity of MB extracts, i.e., root extract (RE), shoot extract and inflorescence extract were determined by using various methods viz 1,-1-diphenyl-2-picrylhydrazyl (DPPH) and a method to assess their possible effect on glucose diffusion across gastrointestinal tract and identify bioactive compound of potent extract. In vivo antilipidemic and antidiabetic activity was evaluated by administrating oral dose of RE for 15 days on STZ- induced diabetic rat. RE showed highest antioxidant activity by scavenging DPPH radical (IC50 32.96 μg/ml) and inhibit 30% glucose movement in vitro. The methanol extract of root showed the presence of calyx [4] arene category of the compound. Furthermore, RE treated rat revealed a reduction in fasting blood glucose (62.5%), serum total cholesterol (36.2%), triglyceride (54.5%), and low-density lipoprotein (50.94%) after 15 days as compared to STZ treated animal. There was an initiation of regenerative structures of the affected organs after 15 days of RE treatment. Histopathological observations clearly differentiate the structural changes in pancreas, liver, and kidney of STZ and RE treated group. The presence of calyx [4] arene class of compound may be responsible for its antioxidant and antidiabetic properties by absorbing glucose in vivo. © 2016 Kalita, Boruah, Deori, Hazarika, Sarma, Kumari, Kandimalla, Kotoky and Devi.

Hazarika A.,Institute of Advanced Study in Science and Technology | Kalita H.,Institute of Advanced Study in Science and Technology | Chandra Boruah D.,Goalpara College | Chandra Kalita M.,Gauhati University | Devi R.,Institute of Advanced Study in Science and Technology
Nutrition | Year: 2016

Objectives: Chronic consumption of high-carbohydrate, high-fat (HCHF) diet induces metabolic syndrome (MetS) and markedly impairs the ultra-structure of organs. To our knowledge, no scientific study has yet to report the effect of withdrawal of an HCHF diet on MetS-associated ultra-structural abnormalities in affected organs and tissues. Therefore, the aim of this study was to investigate the effects of subchronic withdrawal of the HCHF diet, specifically with a pathophysiological approach. Methods: Wister albino rats (N = 72) were divided into three groups: Groups A and B were fed a standard basal diet and an HCHF diet, respectively, for 16 wk. Group C was on an HCHF diet for the initial 12 wk and then returned to basal diet for 4 wk. Histopathological changes in the heart, lungs, liver, spleen, pancreas, small intestine, kidney, white adipose tissue (WAT), skeletal muscle, and hippocampus of the brain were monitored at 4, 8, 12, and 16 wk. Results: Lipid droplets (LDs) in liver, fibrosis in the pancreas, abnormalities in the glomerulus of the kidney, and an increase in the size of adipocytes were observed in groups B and C at week 12. Withdrawal of the HCHF diet in group C showed the onset of regenerative features at the ultra-structural level. HCHF diet-fed rats in group B had higher body weights; raised lipid profiles, blood glucose levels, and insulin resistance than basal diet-fed rats in group A and HCHF to basal diet-fed rats in group C at week 16. Conclusion: An HCHF diet induces ultra-structural abnormalities, which are significantly reversed by subchronic withdrawal of a MetS-inducing HCHF diet, indicating the onset of natural recovery at the ultra-structural level of affected organs. © 2016 Elsevier Inc.

Kalita H.K.,Gauhati University | Talukdar B.,Gauhati University | Baishya R.A.,Gauhati University | Basumatary S.,Gauhati University | And 4 more authors.
Nature Environment and Pollution Technology | Year: 2015

The study was conducted in a society pond of Gandhibasti village of Abhayapuri, Bongaigaon, Assam to assess the impact of duck droppings on water quality and pond productivity. The pond was integrated with ducks (Anas platyrhynchos) to obtain the benefit of duck litters on the pond productivity and fish growth. The mean dry weight of 80 ducks excreta was estimated as 3.864 kg/ha/day, discharging into the pond. 18,000 fingerlings. Indian major carps along with few exotic carp were stocked in the month of April, 2013. Supplementary feed was also given to the fishes in alternate days to ensure their steady growth. All the studied physico-chemical parameters were found within the permissible limit and the growth of fishes was also satisfactory. The maximum growth was recorded in Catla followed by silver carp, common carp, Rohu and Mrigala. © 2015, Technoscience Publications. All rights reserved.

Borah M.,Tezpur University | Borah M.,Goalpara College | Mohanta D.,Tezpur University
Chinese Journal of Physics | Year: 2015

We report on a nonhazardous, low cost, and mass producible composite-hydroxidemediated (CHM) route for obtaining nanoscale barium titanate (BT) cubes. The typical edge-length of the BT nanocubes was found to be ~ 78 nm for a sample subjected to 18h of heat treatment. Essentially, the nanocubes are characterized by well-defined crystal facets and edges as revealed from electron microscopy studies. Facilitated by the composite hydroxide environment, the evolution of nanocubes was believed to be due to the effect of the slow assimilation and the ripening mechanism of seed nanoparticles formed during the initial stage of synthesis. The developed nanocubes are likely to be hollow, having single crystalline facets and a line dislocation density of magnitude ~ 103 μm-2. The optical emission characteristics obtained from photoluminescence (PL) studies have revealed a broad, overall spectra owing to the superimposition of individual contributions that led to radiative emissions of different origin. As compared to defects and self trapped excitons observable in the visible region, the near band edge emission (~ 380 nm) was substantially improved in the case of samples prepared with a longer duration of heat treatment. © 2015 The physical society of the republic of china.

Borah M.,Tezpur University | Borah M.,Goalpara College | Mohanta D.,Tezpur University
Applied Physics A: Materials Science and Processing | Year: 2016

We report on the development of nanostructured barium titanate (BaTiO3, BT) films on ~200-μm-thick Ag substrates by employing a cathodic electrophoretic deposition (EPD) technique, where solid-state-derived BT nanoparticles are used as the starting material. Structural, morphological and compositional analyses of the as-synthesized BT nanoparticles and films were performed by X-ray diffraction, electron microscopy and energy-dispersive spectroscopy studies. The synthesized nano-BT system has an average crystallite size of ~8.1 nm and a tetragonality (c/a) value ~1.003. To reveal current transport mechanism, the BT films possessing microporous structures and surrounded by homogeneously grown islands were assessed in a metal–insulator–metal (MIM) conformation. The forward current conduction was observed to be purely thermionic up to respective voltages of ~1.4 and 2.2 V as for the fresh and 3-day aged samples. On the other hand, direct tunneling (DT)-mediated Ohmic feature was witnessed at a comparatively higher voltage, beyond which Fowler–Nordheim tunneling (FN) dominates in the respective MIM junctions. The magnitude of current accompanied by FN process was observed to be stronger in reverse biasing than that of forward biasing case. The use of microporous BT films can offer new insights as regards regulated tunneling events meant for miniaturized nanoelectronic elements/components. © 2016, Springer-Verlag Berlin Heidelberg.

Sarma D.,Goalpara College | Dutta A.,Gauhati University
Nature Environment and Pollution Technology | Year: 2012

The ecology in terms of physico-chemical and biological properties of Urpod beel and Kumri beel of Goalpara district of Assam were assessed from2001 to 2003. Physico-chemical properties of both the wetlands were observed favourable. Biological properties such as plankton population and primary productivity fluctuated within the permissible limits. However, eutrophication tendency appeared in both the wetlands due to autochthonous and allochthonous input.

Ahmed S.,Goalpara College | Kalita T.K.,Goalpara College
JP Journal of Heat and Mass Transfer | Year: 2010

Combined periodic heat and mass transfer free convection flow of a viscous incompressible fluid past an infinite isothermal vertical porous plate in slip flow regime with homogenous chemical reaction of first order has been studied. Assuming variable suction velocity at the plate, analytical expressions for flow characteristics have been obtained. The effects of fundamental parameters on the flow variables are discussed quantitatively with the aid of graphs for the velocity and concentration profiles as well as the fluctuating parts of skin friction and mass transfer. Comparison between the results of the present analytical model with previously published works provides excellent agreement. It is observed that the chemical reaction decelerates the fluid velocity as well as species concentration, whereas chemical reaction leads to increase the amplitude of skin friction.

Sarma D.,Goalpara College | Das J.,Goalpara College | Dutta A.,Gauhati University
International Journal of Pharma and Bio Sciences | Year: 2012

Present investigation deals with management of Ompok pabo brooders up to maturity for the period of December/2007 to November/2010. Brood fishes of the sizes 12 to 16 cm in total length and 22.19gm to 25.20gm were collected, released and cultured in the polyculture pond with proper management. Essential water quality parameters were monitored regularly and corrected during the period of study. Brooders were fed with earth worm, formulated food, live & trash small fishes, formulated pellet of mixed silk worm pupae and rice polish in appropriate rate and ratio. Maturity was attained at the age of about one year in the stocking pond after rearing for six months. Fully matured brood fishes were measured 21.0 cm to 23.7 cm in total length and 65.0 gm to 75.0 gm in weight. Sexual dimorphism of Males and females could be fully distinguishable from the month of May onwards.

Choudhury D.K.,Gauhati University | Choudhury R.,Goalpara College
Indian Journal of Physics | Year: 2012

In order to obtain analytic solutions of the spin dependent coupled Altarelli-Parisi equations at leading order (LO) in the small x limit we have applied here the method of successive iterations. We have shown that barring the small x limit of the splitting functions at LO, this method does not require any other adhoc assumptions to obtain analytic solutions of the coupled AP equations. We have observed that, after successive iterations our solutions come closer to the exact numerical results. © 2012 IACS.

Ahmed S.,Goalpara College
Latin American Applied Research | Year: 2010

This paper deals with the mixed convection hydromagnetic oscillatory flow and periodic heat transfer of a viscous incompressible and electrically conducting fluid past an infinite vertical porous plate. The plate is subjected to a constant suction velocity and heat absorbing sinks, while the free stream is oscillating with time. A magnetic field of uniform strength is applied in the direction normal to the plate. The transient, nonlinear and coupled governing equations are solved using multiparameter perturbation technique. Approximate solutions have been derived for the velocity and temperature fields as well as mean skin-friction and mean rate of heat transfer. It is found that, the increase in magnetic field strength leads to decrease transient velocity as well as temperature. Further, the amplitude (|H|) as well as phase (tanβ) of the mean rate of heat transfer increases with increasing magnetic field strength (M) for electrolytic solution (Pr=1.0), while a reverse phenomenon is observed for mercury (Pr=0.025).

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