IR@NEIST - North East Institute of Science and Technology (CSIR)
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Nanomolar Detection of Glutamate at a Biosensor Based on Screen-Printed Electrodes Modified with Carbon Nanotubes
Get PDFThe flow injection analysis (FIA) of monosodiuml-glutamate (MSG) was performed electrochemically using a biosensor
based on screen-printed electrodes containing carbon nanotubes (CNT). The sensor was fabricated by simply
adsorbing glutamate oxidase (GlutOx) on the electrode surface. The resulting device displayed excellent electroanalytical
properties toward the determination ofl-glutamate in a wide linear range (0.01–10mM) with low detection
limit (10 nM, S/N
!3), fast response time ( 5 s), and good operational and long-term stability. The CNT-modified
screen-printed electrodes have a potential to be of general interest for easy preparation of electrochemical sensors
and biosensors relevant for biomedical applications
Copolymers of bulky fumarate: synthesis and their properties
Get PDFThe free radical copolymerization of di-n-docosyl
fumarate with vinyl acetate and n-alkyl (meth)acrylates was
carried out in toluene at 70°C using benzoyl peroxide as an
initiator. 1H NMR and carbon analysis was used to
determine the copolymer compositions. Monomer reactivity
ratios for high conversion polymerization were calculated by
Fineman-Ross, Kelen-Tüdös and conversion extension
Kelen-Tüdös methods. Gel permeation chromatography
was used to determine the molecular weights and polydispersity
indexes. In order to determine the stability of
polymers against thermal degradation, the kinetics and
mechanism of the thermal degradation of copolymers were
investigated by differential scanning calorimetry and thermogravimetric
analysis techniques. The energy of activation
of the degradation process was determined by several
thermogravimetric analysis models
Estimation of crustal discontinuities from reflected seismic waves recorded at Shillong and Mikir Hills Plateau, Northeast India
Get PDFIn this study, an attempt is made to determine
seismic velocity structure of the crust and upper mantle
beneath the Shillong-Mikir Hills Plateau in northeast India
region. The principle of the technique is to relate seismic
travel times with crustal thickness above the Conrad and
Moho discontinuities. Broadband digital waveforms of the
local earthquakes make a precise detection of the seismic
phases possible that are reflected at these discontinuities.
The results show that the Conrad discontinuity is at 18–20
(±0.5) km beneath the Shillong-Mikir Hills Plateau and
the Moho discontinuity is at 30 ± 1.0 km beneath the
Shillong Plateau and at 35 ± 1.0 km beneath the Mikir
Hill
Potential Rhodium and Ruthenium Carbonyl Complexes of Phosphine-Chalcogen (P-O/S/Se) donor ligands and Catalytic applications,
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Improvement of the mechanical strength of alumina performs by coating with montmorillonite / LDH ge
Get PDFAcompositematerialwaspreparedfrommontmorilloniteandMg–AlLDH.Theseoppositelychargedparticles
form thixotropic gels with distinctflow and micro-structural properties. The stability of the gel was
dependent on the montmorillonite/LDH ratio. Novel advanced ceramic materials were designed by coating
ceramic preforms with these gels. During calcination these gels decompose to metal oxides, aluminosilicates
and spinel. On calcination at 1400 °C, MgO formed from the LDH of the gel reacted with the aluminosilicate
formed by the decomposition of the montmorillonite. A non-porous dense matrix was formed with well
grown crystals of MgAl2O4 spinel embedded in the aluminosilicate matrix. When the ceramic preforms like
porous alumina tube were dip coated with the gel andfired at 1400 °C, the molten aluminosilicate infiltrated
into the pores of the aluminum oxide carrying spinel crystals. These spinel crystals settled in the pores and
increased the mechanical strength of the alumina tubes. The compressive strength was increased by around
94% and the mechanical extension in the z-direction in the coated body by 4% compared to the uncoated
counterpart
Geotechnical properties of the bank sediments along the Dhansiri River channel,Assam
Get PDFThe bank sediments along the extremely meandered Dhansiri River channel, a south bank tributary of the
mighty Brahmaputra River, with erosion potentiality have been investigated to evaluate its certain geotechnical
characteristics. The study has shown that the bank sediments are basically composed of CL and ML types of soil. These
types of sediments are very much prone to liquefaction which in turn related to erosion susceptibility. The bank stability
analysis has differentiated the studied stretch into unstable, at risk and stable zones. Most of the erosion affected
zones along the channel reach under study are located within the unstable or at risk zones. The field study around
Butalikhowa, Barguriagaon, Golaghat and Duchmuagaon areas along the channel with active erosion activity has supported
our contention and practical utility of the present study. It is expected that such type of study will help in providing
certain inevitable baseline information for various channel management practices for this extremely flood prone areas
of Northeast India
