Guwahati University

Guwāhāti, India

Guwahati University

Guwāhāti, India

Time filter

Source Type

Devi M.,Guwahati University | Barbara A.K.,Guwahati University | Ruzhin Y.Y.,IZMIRAN | Hayakawa M.,University of Electro - Communications
Surveys in Geophysics | Year: 2012

The purpose of this paper is to review current activities for the identification of earthquake (EQ) precursors and their epicentres. Starting with a brief description on the background to approaches using ultra-low (ULF), extremely low (ELF), very low/low (VLF/LF), medium (MF), high (HF), very high frequency (VHF) etc. radio waves for short-term EQ prediction, the paper concentrates on those characteristics of anomalous VHF reception from frequency-modulation (FM) radio transmissions and broadcast television (TV) signals in relation to EQ precursors. The possible ways to identify an impending EQ and its epicentre position as defined and observed by workers from a variety of studies fall within the purview of the paper. In attempts to find pre-EQ energy exchange and coupling processes between the lithosphere and atmosphere, the paper highlights some relevant observations of surface latent heat flux, sonic detection and ranging (SODAR) echograms and LF propagation. Explanations on possible causes leading to such anomalous reception are reviewed with reported results in association with pre-seismic induced modifications to tropospheric and ionospheric parameters. © 2012 Springer Science+Business Media B.V.

Choudhury D.K.,Guwahati University | Choudhury D.K.,Physics Academy of North East | Pathak K.K.,Arya Vidyapeeth College
International Journal of Modern Physics A | Year: 2014

Considering the allowed range of slope ρ2 and curvature C of Isgur-Wise function for B meson, we obtain an allowed range of strong coupling constant αs as well as the QCD scale parameter Λ in a specific prescription. The allowed range of Λ is then used to obtain the theoretical bounds on Vcb in a potential model. The recent available data of Vcb are found to lie within this computed range 0.0375 ≤|Vcb|≤0.0410. © 2014 World Scientific Publishing Company.

Devi L.S.,Guwahati University | Bhattacharya C.,Banaras Hindu University | Chatterjee A.,University of Calcutta | Borthakur S.K.,Guwahati University | Irabanta Singh N.,Manipur University
International Journal of PharmTech Research | Year: 2014

Different biochemical reactions in our body generate free radicals and these are capable of damaging crucial biomolecules. Mushrooms have the capacity to destroy such free radicals formed in our body as they possess antioxidant properties. The purpose of this study was to determine the antioxidant activities of mushroom, Pleurotus cornucopiae collected from Eastern Himalayan region. Antioxidant activity was determined using reducing power assay, DPPH radical scavenging assay, chelating effect of ferrous ion and total antioxidant capacity assay. Ethanolic fraction from the above mentioned edible mushroom was also tested for total phenol, flavonoid, β-carotene, lycopene and ascorbic acid content. Findings showed that most of the EC50 values were more than 2 mg /ml except DPPH radical scavenging test. The extract exhibited 50% DPPH radical scavenging activity at only 1.5 mg /ml concentration. Estimated putative antioxidant components was in order of phenol > ascorbic acid > flavonoids > β-carotene > lycopene. Result implies that P. cornucopiae can be a potential source of natural antioxidants which may be used as a food supplement to treat various oxidative stress related diseases.

Mahesh P.,CSIR - Central Electrochemical Research Institute | Catherine J.K.,CSIR - Central Electrochemical Research Institute | Gahalaut V.K.,CSIR - Central Electrochemical Research Institute | Kundu B.,CSIR - Central Electrochemical Research Institute | And 17 more authors.
Gondwana Research | Year: 2012

We analyze GPS data from 26 sites located on the Indian plate and along its boundary. The large spatial coverage of the Indian plate by these sites and longer data duration helped us in refining the earlier estimates of the Euler pole for the Indian plate rotation. Our analysis suggests that the internal deformation of the Indian plate is very low (<1-2mm/year) and the entire plate interior region largely behaves as a rigid plate. Specifically, we did not infer any significant difference in motion on sites located north and south of the Narmada Son failed rift region, the most prominent tectonic feature within the Indian plate and a major source of earthquakes. Our analysis also constrains the motion across the Indo-Burmese wedge, Himalayan arc, and Shillong Plateau and Kopili fault in the NE India. © 2012 International Association for Gondwana Research.

Zaman F.A.,CRH Medical | Sheikh S.,BN College | Das K.C.,Guwahati University | Zaman G.S.,King College | Pal R.,CRH Medical
Journal of Natural Science, Biology and Medicine | Year: 2014

Context: Tuberculosis (TB) affects the economically productive age group and has emerged as a disease of significant socioeconomic global burden. Aims: The aim of this study is to identify epidemiological factors responsible for TB and the clinico-social correlates influencing their compliance. Subjects and Methods: All new smear positive TB (NSP-TB) patients registered in Dhubri District Tuberculosis Center-Tuberculosis Unit during 2007 in Assam were included in this study. The study was performed by interview technique using a pre-tested questionnaire. Results: Nearly 90.76% of the participants were in the age group of 15-55 years and were predominantly unskilled workers and sole earning member of their family. 83.33% of the patients had symptoms of cough for more than 3 weeks and most of them (98.15%) lived in overcrowded houses. More than half of the patients had X-ray examination as their initial approach to diagnosis. More males (59.18%) than females (40.82%) reported to the health institution within first 6 weeks after the onset of symptom and among them 91.84% were declared cured after completion of therapy and while, only 40% of the patients initiating treatment after 6 weeks of the onset of symptoms were declared cured after completion of therapy. Conclusions: The prevalence of NSP-TB cases was more among the illiterate and underprivileged population who needs counseling and motivation for early intervention. © Journal of Natural Science, Biology and Medicine.

PubMed | Indian Institute of Chemical Biology IICB, Dibrugarh University, Guwahati University and Indian Institute of Technology Guwahati
Type: Journal Article | Journal: Expert opinion on drug delivery | Year: 2016

A curcumin-docetaxel co-loaded nanosuspension with increased anti-breast cancer activity was developed. Curcumin is a potential anticancer agent with p-glycoprotein (p-gp) inhibiting activity may be co-administered with docetaxel as a nanosuspension to enhance its anticancer effect by increasing the oral bioavailability and decreasing drug efflux.Nanosuspensions of curcumin and docetaxel were prepared by precipitation-homozenisation technique and evaluated for particle size, polydispersity, zeta potential and drug release. The in vitro MTT assay was conducted using MCF-7 for anti-breast cancer activity. The in vivo biodistribution by radiolabeling and tumor inhibition study was conducted in mice.Homogenous nanosuspensions of 8020nm were obtained with increased solubility. The drugs as nanosuspensions showed higher cytotoxicity on MCF-7 cell line compared to their suspensions due to the increased in vitro cellular uptake. Due to this increased solubility, sensitization of tumor cells and inhibition of p-gp the in-vivo results showed greater tumor inhibition rate of up to 70% in MCF-7 treated mice. Histopathological results showed higher apoptotic activity and reduced level of angiogenesis.The in vitro and in vivo study of the nanosuspensions has shown that Co-administration of Curcumin as a p-gp inhibitor with docetaxel may have the potential to increase the anti-breast cancer efficacy of both drugs.

Debnath R.K.,Guwahati University | Kalita A.,Indian Institute of Technology Guwahati | Mondal B.,Indian Institute of Technology Guwahati | Ganguli J.N.,Guwahati University
Asian Journal of Chemistry | Year: 2014

Five benzoxazine were synthesized by Mannich condensation reaction between 2,4-ditert-butyl phenol, formaldehyde and different amines in one pot synthesis. The benzoxazines were characterized by elemental analysis, spectral and crystal structure determination. The synthesis process requires considerable less time and three of the five benzoxazines are new and reported for the first time. © 2014, Chemical Publishing Co. All rights reserved.

Saikia N.,Guwahati University | Ahmed S.A.S.,Guwahati University
Physica Scripta | Year: 2011

The extended transformation method has been applied to the exactly solvable stipulated Morse potential and trigonometric Scarf potential, to generate a set of exactly solvable quantum systems (QSs) in any chosen dimension. Bound state solutions of the exactly solvable potentials are given. The generated QSs are generally of Sturmian form. We also report a system case-specific regrouping technique to convert a Sturmian QS to a normal QS. A second-order application of the transformation method is given. The normalizability of the generated QSs is generally given in Sturmian form. © 2011 The Royal Swedish Academy of Sciences.

Aryl/alkyl(2,2′-bis-3-methylindolyl)methanes and aryl(bis-3,3′- indolyl)methanes are synthesized in high yield using ionic liquids mediated by microwave. Reaction conditions and product recovery are simple and ionic liquids could be recycled. © 2012 Elsevier B.V. All rights reserved.

PubMed | Dr B Borooah Cancer Institute and Guwahati University
Type: Journal Article | Journal: Annals of medical and health sciences research | Year: 2014

The incidence of gall bladder cancers in this part of the world is high and the spatial variation in occurrence of gall bladder cancers can be identified by using geographical information system.Data set containing the address information of gall bladder cancer patients from the District of Kamrup, India was obtained from cancer registry of a regional cancer center. The data set consisted of patients registered during the period of January 2010 to December 2012. The ArcGIS 10.0 used for the present analysis and the population density map of the District was prepared by using LandScan, 2008.There were isolated areas with very high density of cases and low population density termed as hot spots. Alternatively there were areas with very high population density and lesser number of cases with gall bladder cancers.This type of an analysis using GIS provides evidence to conduct joint research by epidemiologists and specialists from environmental and geological sciences in tandem.

Loading Guwahati University collaborators
Loading Guwahati University collaborators