Jabalpur, India

Rani Durgavati University

Jabalpur, India

Rani Durgavati University , also known as University of Jabalpur, is a government university in Jabalpur, Madhya Pradesh, India. It was named after the queen Rani Durgavati. It is the main university of this city and has been graded as B++ by the National Assessment and Accreditation Council . Wikipedia.

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Verma K.K.,Rani Durgavati University
Analytical Chemistry | Year: 2017

Relative to many other areas in chemistry, analytical chemistry appears singularly lagging behind in India despite the commendable growth it had shown in the past both in teaching and research. Certain presumptions in policy making and current educational practices are believed to be the crux of the problem. © 2017 American Chemical Society.

Nair M.,M.R.Research | Sandhu S.S.,Rani Durgavati University | Sharma A.K.,M M University
Current Cancer Drug Targets | Year: 2014

With the recent emergence of novel technologies, the field of biomarker discovery has been the subject of intense research and activity. Major advances in cancer control will be greatly aided by early detection for the diagnosis and treatment of cancer in its pre-invasive state. Cancer being a diverse disease involves alterations in three classes of genes viz. (proto) oncogenes, tumour suppressor genes and DNA repair genes offering a wide variety of opportunities for the development of biomarkers. The emergence of innovative technologies in genomics, proteomics, metabolomics and imaging allows researchers to facilitate inclusive analysis of cancer cells. These approaches have already demonstrated its power to discriminate cancer cells from normal cells and to identify specific genetic elements involved in cancer progression. Cancer evolves via manifold pathways and is a culmination of a variety of genetic, molecular and clinical events. In the past few years, several reports have led to identification of novel cancer signatures via high throughput biology. Current review gives an overview of the bioinformatics tools, cancer database and available software package tools and further summarizes about different strategies involved in Omics research (genomics, proteomics, metabolomics) for the development of cancer biomarkers. We also discuss about the current and emerging biomarkers in breast cancer with fundamental insight into different markers used in breast cancer detection. In addition, we focus upon the systematic integration of various omic data for accelerating cancer biomarker discovery with evidence based cancer management. The above strategies may lead to significant improvement in cancer screening, prognosis and management of therapeutic response in cancer patients. © 2014 Bentham Science Publishers.

Chandra V.K.,Chhatrapati Shivaji Institute of Technology | Chandra B.P.,Rani Durgavati University | Jha P.,Rani Durgavati University
Applied Physics Letters | Year: 2013

The long time dream of mechanoluminescence (ML) research to fabricate mechanoluminescence white light sources and mechanoluminescence displays seems to be turning into reality after the recent demonstration of highly bright and durable mechanoluminescent flexible composite films with a brightness of ≈120 cd/m2 and durability over ≈100 000 repeated mechanical stresses by using a combination of copper-doped zinc sulfide (ZnS:Cu) particles and polydimethylsiloxane. The present paper explores that self-recovery of mechanoluminescence of deforming piezoelectric semiconductors takes place by trapping of drifting charge carriers in the presence of piezoelectric field. This may be useful in enhancing the intensity and durability of ML devices. © 2013 AIP Publishing LLC.

Chandra V.K.,Chhatrapati Shivaji Institute of Technology | Chandra B.P.,Rani Durgavati University | Jha P.,Rani Durgavati University
Applied Physics Letters | Year: 2013

The luminescence induced by elastic deformation of solids, called the phenomenon of elastico-mechanoluminescence (EML), is observed in several materials. For applied pressure in the range of 17 MPa, certain crystals emit intense EML, which can be seen in day light with naked eye. In the present paper, we explore that, as the piezoelectric constant near the photo-generated electric dipoles formed by trapping of charge carriers in crystals is several times higher as compared to that at normal sites, the piezoelectrically induced detrapping of charge carriers and EML emission may take place for less value of the pressure applied onto the crystals. © 2013 AIP Publishing LLC.

Jha P.,Rani Durgavati University | Chandra B.P.,Rani Durgavati University
Luminescence | Year: 2014

Mechanoluminescence (ML) is a type of luminescence induced by any mechanical action on solids. The light emissions induced by elastic deformation, plastic deformation and fracture of solids are called elastico ML (EML), plastico ML (PML) and fracto ML (FML), respectively. Whereas nearly 50% of all organic molecular solids and inorganic salts exhibit FML, only a few solids exhibit EML and PML. The EML and FML of certain solids areso intense that they can be seen during daylight with the naked eye. Mechanolumnescence has a great potential for use in different types of mechano-optical devices such as stress sensors, damage sensors, impact sensors, fracture sensors and safety management monitoring systems. This article reports a survey of the literature from 1605 to 2013. Mechanoluminescence is studied by physicists, chemists, material scientists, geologists, medical scientists, engineers and technologists, among others and researchers will certainly benefit from the literature survey on ML given here. In addition, the field of mechanoluminescence may attract the interest of many new researchers. Copyright © 2014 John Wiley & Sons, Ltd.

Sharma A.,Rani Durgavati University | Bhattacharya A.,Rani Durgavati University
Journal of Molecular Catalysis B: Enzymatic | Year: 2010

Phenomenal rise in CO2 concentration have led to disastrous consequences. The present study endeavors the biomimetic sequestration of CO2 into CaCO3 using biological catalyst; carbonic anhydrase (CA) purified from Pseudomonas fragi, Micrococcus lylae and Micrococcus luteus 2 along with a comparative evaluation of their efficiency against commercial bovine carbonic anhydrase (BCA). At pH range 8.0-9.0 and temperature range 35-45 °C, maximum stability was observed for CA from M. luteus 2 followed by P. fragi CA, M. lylae CA and BCA. P. fragi CA demonstrated maximum stability as function of time with respect to pH and temperature. The anionic inhibitors, Cl-, SO4 2-, NO 3 -, HCO3 and toxic metal ions viz., lead, arsenic and mercury showed varied inhibitory profile against the four different CAs. The level of inhibition was significantly higher for BCA and M. luteus 2 CA compared to P. fragi CA and M. lylae CA. Calcium estimation was found to be a reliable method for the determination of sequestration efficiency. Indigenous CAs and their consortia exhibited enhanced CO2 sequestration competence compared to commercial BCA. Sequestration efficiency at 45 °C, under process parameters was found to be maximum for CA consortia (61%) and minimum for commercial BCA (17.8%) indicating its potential application in an onsite scrubber. © 2010 Elsevier B.V. All rights reserved.

Ramrakhiani M.,Rani Durgavati University | Nogriya V.,Rani Durgavati University
Journal of Luminescence | Year: 2013

Nanocrystalline cadmium selenide(CdSe) powder as well as nanocomposites of CdSe in poly vinyl alcohol (PVA) matrix were prepared by chemical method and characterized by TEM and XRD. Hexagonal phase has been observed with size depending on preparation conditions. Absorption spectra of powder samples give a peak and then monotonous increase in absorption at shorter wavelengths where as nanocomposites show only absorption edge. Powder samples were excited by 300 nm UV light and photoluminescence (PL) spectra show single peak between 345 and 400 nm. It is seen that as the particle size is reduced the intensity of luminescence increases. In case of nanocomposites, PL was excited by 475 nm light and emission spectra show two peaks at 525 and 575-585 nm. Electroluminescence (EL) study of CdSe nanopowder and CdSe/PVA nanocomosite show that the emission starts at a threshold voltage and then increases with voltage. Lower threshold and higher brightness have been observed for smaller particles. Current is found to increase linearly with voltage indicating ohmic nature. The EL spectrum of CdSe/PVA nanocomposites shows only one broad peak at 580 nm similar to PL. The relation between brightness and voltage indicates that EL is produced by acceleration-collision mechanism. The investigations have revealed that intensity of photo- as well as electro-luminescence can be increased by reducing the size of CdSe nanocrystals. Nanocrystalline CdSe powder shows better photoluminescence but for electroluminescence nanocomposite is beneficial. © 2011 Elsevier B.V.

Jha P.,Rani Durgavati University | Chandra B.P.,Rani Durgavati University
Journal of Luminescence | Year: 2013

The present paper reports the impulsive excitation of mechanoluminescence (ML) in SrAl2O4:Eu, Dy phosphor prepared by solid state reaction technique in a reduced atmosphere of 95% Ar+5% H2. The phosphors prepared exhibit such as intense ML that it can be seen in day light with naked eye. When a sample consisting of compact mass of the phosphor is deformed impulsively by the impact of a moving piston, then initially the mechanoluminescence intensity increases linearly with time, attains a peak value Im at a particular time tm, and later on it decreases with time, initially at a fast rate and then at a slow rate. The peak ML intensity Im and total ML intensity IT increase quardratically with the applied pressure and impact velocity. The ML spectra of SrAl2O4:Eu, Dy are found to be similar to the photoluminescence spectra. This result indicates that the ML is emitted from the Eu2+ ions as photoluminescence does. The ML intensity decreases with successive impact of the load onto the phosphors, whereby the diminished ML intensity can be recovered approximately by UV-irradiation. retain - >In the impulsive excitation, the complete recovery of ML intensity does not take place because the probability of radiative transition of luminescence centres formed near the newly created surfaces may decrease due the formation of surface traps. The values of tm, fast decay time and slow decay time do not change significantly with the impact velocity vo. The piezoelectrically- induced detrapping model is able to explain the characteristics of ML. According to this model, the local piezoelectric field near the activators causes the detrapping of electrons trapped in the negative oxygen vacancy and subsequently the detrapped electrons moving in the conduction band are captured by the Eu3+ ion, whereby the excited Eu2+ ions are produced and the subsequent de-excitation of excited Eu2+ ions gives rise to the light emission. It seems that, in addition to the change in crystal structure, in UV-irradiated SrAl2O4:Eu, Dy crystals, some localized electric dipoles present in the vicinity of Eu2+ ions may also enhance the piezoelectric constants of the crystals. The day light visible mechanoluminescence in SrAl2O4:Eu, Dy phosphors may be used for designing the impact stress and impact velocity sensors. Furthermore, the present investigation may be useful for determining the rise time of unknown pressure pulses and for determining the lifetime of charge carriers in shallow traps. The intense ML pulses may also be used in some specific photocatalytic reaction. The present study may also be helpful in preparing the ML-based light source by increasing the trap-depth of shallow traps. If the ML emission in certain materials will be in the ultraviolet range, then the ML pulses of short duration may be used to excite the phosphorescence and determining the decay time. © 2013 Elsevier B.V.

Sharma A.,Rani Durgavati University | Bhattacharya A.,Rani Durgavati University | Shrivastava A.,Rani Durgavati University
Enzyme and Microbial Technology | Year: 2011

The present study deals with immobilization of purified CA and whole cell of Pseudomonas fragi, Micrococcus lylae, and Micrococcus luteus 2 on different biopolymer matrices. Highest enzyme immobilization was achieved with P. fragi CA (89%) on chitosan-KOH beads, while maximum cell immobilization was achieved with M. lylae (75%) on chitosan-NH 4OH beads. A maximum increase of 1.08-1.18 fold stability between 35 and 55°C was observed for M. lylae immobilized CA. The storage stability was improved by 2.02 folds after immobilization. FTIR spectra confirmed the adsorption of CA on chitosan-KOH beads following hydrophilic interactions. Calcium carbonate precipitation was achieved using chitosan-KOH immobilized P. fragi CA. More than 2 fold increase in sequestration potential was observed for immobilized system as compared to free enzyme. XRD spectra revealed calcite as the dominant phase in biomimetically produced calcium carbonate. © 2011 Elsevier Inc.

Chandra B.P.,Rani Durgavati University | Chandra V.K.,Chhatrapati Shivaji Institute of Technology | Jha P.,Rani Durgavati University
Applied Physics Letters | Year: 2014

The concepts of piezoelectric field dependence of the detrapping probability and lifetime of charge carriers in traps are developed. The charge carriers in traps become unstable after a particular piezoelectric field whereby more number of charge carriers are detrapped with increasing piezoelectric field. The detrapped electrons tunnel to the energy level of the hole-captured activator ions lying adjacent to the conduction band or tunnel to conduction band. Subsequently, luminescence is induced by the electron-hole recombination. Using these concepts microscopic theory of elastico-mechanoluminescent smart materials is explored. Present study may be useful in tailoring intense elastico-mechanoluminescent materials needed for different applications. © 2014 AIP Publishing LLC.

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