- Village and Post Neemgone tahshil mitauli district lakhimpur kheri
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Cardiomyocyte dysfunction in patients with end-stage heart failure with reduced ejection fraction (HFrEF) stems from mitochondrial dysfunction that contributes to an energetic crisis. Mitochondrial dysfunction reportedly relates to... more
Cardiomyocyte dysfunction in patients with end-stage heart failure with reduced ejection fraction (HFrEF) stems from mitochondrial dysfunction that contributes to an energetic crisis. Mitochondrial dysfunction reportedly relates to increased markers of oxidative stress, but the impact of reversible thiol oxidation on myocardial mitochondrial function in patients with HFrEF has not been investigated. In the present study, we assessed mitochondrial function in ventricular biopsies from patients with end-stage HFrEF in the presence and absence of the thiol reducing agent dithiothreitol (DTT). Isolated mitochondria exposed to DTT had increased enzyme activity of complexes I (p = 0.009) and III (p = 0.018) of the electron transport system, while complexes II (p = 0.630) or IV (p = 0.926) showed no changes. However, increased enzyme activity did not carry over to measurements of mitochondrial respiration in permeabilized bundles. Oxidative phosphorylation conductance (p = 0.439), maximal ...
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Aquilaria malaccensis Lam. is commonly known as Agarwood which is distributed in the Indo-malesian genus Aquilaria of family Thymelaeaceae known to produce resin-impregnated heartwood that is fragrant and highly valuable. Agarwood is... more
Aquilaria malaccensis Lam. is commonly known as Agarwood which is distributed in the Indo-malesian genus Aquilaria of family Thymelaeaceae known to produce resin-impregnated heartwood that is fragrant and highly valuable. Agarwood is reputed to be the most expensive wood in the world. Twenty two open pollinated families in A. malaccensis were selected and evaluated for growth attributes and genetic divergence. The experiment was conducted at Forest College and Research Institute, Tamil Nadu Agricultural University; Mettupalayam situated at 11° 19’ N longitude, 76° 56’ E latitude at 300 MSL during January - December 2010. The study indicates significant differences among the selected families for various growth attributes. Among the twenty two progenies evaluated, three progenies viz., NHJA, KHOW-1 and CHEK-1 exhibited consistent superiority over growth periods for shoot length, collar diameter and number of branches. Genetic divergence studies resulted in grouping of the selected fa...
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The effect of 190MeV 107Ag ion irradiation on antiphase boundaries (APBs) of epitaxial Fe3O4 thin films (thickness∼ 70nm) grown on MgO (100) oriented substrate has been investigated. The X-ray diffraction shows that at low fluence values... more
The effect of 190MeV 107Ag ion irradiation on antiphase boundaries (APBs) of epitaxial Fe3O4 thin films (thickness∼ 70nm) grown on MgO (100) oriented substrate has been investigated. The X-ray diffraction shows that at low fluence values upto 5× 1011ions/cm2, ...
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Present work aims to investigate effect of 100 MeV oxygen ion irradiation on the vibrational modes of zinc ferrite nanoparticles. Nanosize zinc ferrite systems of different crystallite size ranging from 12-62 nm were irradiated at the... more
Present work aims to investigate effect of 100 MeV oxygen ion irradiation on the vibrational modes of zinc ferrite nanoparticles. Nanosize zinc ferrite systems of different crystallite size ranging from 12-62 nm were irradiated at the fluence of 1×10(13) and 5×10(13) ions/cm(2). High resolution transmission electron micrograph study indicates the structural disorder induced by ion irradiation. Bands corresponding to various vibrational modes in Fourier transform infrared spectra exhibit changes and are affected by the crystallite size/microstructure of pristine samples. The irradiation induced changes are dominated for sample ZF1000.
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Low-temperature magnetic properties of single phase NdCo1−xNixO3(x = 0.3−0.5) have been studied using ac and dc magnetic susceptibility measurements. Nickel substituted samples have been found to exhibit a different magnetic state at low... more
Low-temperature magnetic properties of single phase NdCo1−xNixO3(x = 0.3−0.5) have been studied using ac and dc magnetic susceptibility measurements. Nickel substituted samples have been found to exhibit a different magnetic state at low temperature as compared to pristine NdCoO3. The temperature dependent dc magnetization M (T) revealed the presence of a sharp cusp occurring at characteristic temperatures TP, for x = 0.3, 0.4, 0.5. Below TP, clear effect of magnetic field can be seen in M (T) curves and TP decreases with increasing magnetic field as well as Ni substitution content. The isothermal magnetization measurements at low temperatures shows small unsaturated hysteresis loop at lowest temperature (10 K). The ac susceptibility results show a clear frequency dependent feature. These results are analyzed to distinguish superparamagnetic and spin glass behavior by using Néel-Arrhennius, Vogel-Fulcher law, and power law fitting. This analysis ruled out the superparamagnet like st...
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Research Interests: Geochemistry, Condensed Matter Physics, Materials Science, Hysteresis, Superconductors, and 13 moreSquid, Ion, Single Crystal, Irradiation, Magnetization, Interdisciplinary Engineering, Magnetometer, Critical Temperature, Ion Irradiation, Hysteresis Loop, high temperature superconductor (HTS), Point Defect, and Magnetic Hysteresis
Corrosion behavior of polymer-derived ceramics (PDCs) was investigated in aqueous hydrofluoric acid (HF) and sodium salts (NaCl or Na2SO4). Two oxides (SiCO and SiCNO-(Hf)) and two non-oxide PDCs (SiCN and SiCN-(B)) were examined in this... more
Corrosion behavior of polymer-derived ceramics (PDCs) was investigated in aqueous hydrofluoric acid (HF) and sodium salts (NaCl or Na2SO4). Two oxides (SiCO and SiCNO-(Hf)) and two non-oxide PDCs (SiCN and SiCN-(B)) were examined in this study. The HF acid corroded the oxide PDCs, whereas non-oxide PDCs resisted acid corrosion. Nevertheless, the degradation is slow in some cases to extend the engineering ceramic materials lifespans. The PDCs composites were hot corroded by NaCl or Na2SO4. The Na-salt attacked the PDCs, producing corrosion layers. The cross-sectional X-ray elemental analysis and microstructure surveillance exhibited that the corroded layers comprised of distinct regions. The corrosion mechanism is discussed in line with the experimental discoveries.
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Tin dioxide (SnO2) thin films were deposited on a well cleaned sapphire single crystal substrate by rf magnetron sputtering technique. After deposition, films were irradiated by swift heavy ion (SHI) irradiation at various ion fluences.... more
Tin dioxide (SnO2) thin films were deposited on a well cleaned sapphire single crystal substrate by rf magnetron sputtering technique. After deposition, films were irradiated by swift heavy ion (SHI) irradiation at various ion fluences. We present the X-ray absorption spectra (XAS) at the oxygen K- and Sn M5,4, edge. The XAS pattern reveals the broadening of O K- and
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A typical giant magnetoresistive (GMR) sample viz. La0.7Pb0.3MnO3 has been irradiated by 50MeVLi3+ ion beam. Irradiated samples have been studied from the measurement of resistivity down to 77K in presence of 1.5T magnetic field. Although... more
A typical giant magnetoresistive (GMR) sample viz. La0.7Pb0.3MnO3 has been irradiated by 50MeVLi3+ ion beam. Irradiated samples have been studied from the measurement of resistivity down to 77K in presence of 1.5T magnetic field. Although magnetoresistance is not maximum at Tim as the samples are polycrystalline, however, a small peak like structure has been found around Tim. The peak is
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... Ravi Kumar c & HH Joshi d pages 666-674. ... Phys. Stat. Sol. (a), 134: 263–271. [CrossRef]; 6. Chhantbar, MC, Trivedi, UN, Tanna, PV, Shah, HJ, Vara, RP, Joshi, HH and Modi, KB 2004. Ind. J. Phys., 78A: 321–326. 7. Potakova, VA,... more
... Ravi Kumar c & HH Joshi d pages 666-674. ... Phys. Stat. Sol. (a), 134: 263–271. [CrossRef]; 6. Chhantbar, MC, Trivedi, UN, Tanna, PV, Shah, HJ, Vara, RP, Joshi, HH and Modi, KB 2004. Ind. J. Phys., 78A: 321–326. 7. Potakova, VA, Zverev, ND and Romanov, VP 1972. Phys. Stat. ...
Research Interests: Condensed Matter Physics, Chemistry, Heat Treatment, Radiation Effects, Absorption spectroscopy, and 13 moreThermal history, Energy Dispersive X-Ray Analysis, Infrared, Ion, X ray diffraction, Spinel, Irradiation, IR Spectroscopy, Structural Properties, Lattice Constant, Crystallite, Ion Irradiation, and Heavy Ions
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A study of the electronic structure and magnetic properties of Co doped ZnO thin films synthesized by ion implantation followed by swift heavy ion irradiation is presented using near-edge x-ray absorption fine structure (NEXAFS) and x-ray... more
A study of the electronic structure and magnetic properties of Co doped ZnO thin films synthesized by ion implantation followed by swift heavy ion irradiation is presented using near-edge x-ray absorption fine structure (NEXAFS) and x-ray magnetic circular dichroism (XMCD) measurements. The spectral features of NEXAFS at the Co L(3,2)-edge show entirely different features than that of metallic Co clusters and other Co oxide phases. The atomic multiplet calculations are performed to determine the valence state, symmetry and the crystal field splitting, which show that in the present system Co is in the 2+ state and substituted at the Zn site in tetrahedral symmetry with 10Dq = -0.6 eV. The ferromagnetic character of these materials is confirmed through XMCD spectra. To rule out the possibilities of defect induced magnetism, the results are compared with Ar annealed and Ar-ion implanted pure ZnO thin films. The presented results confirm the substitution of Co at the Zn site in the ZnO matrix, which is responsible for room temperature ferromagnetism.
Research Interests: Materials Engineering, Physics, Condensed Matter Physics, Materials Science, Nanotechnology, and 15 moreMedicine, Magnetic Properties, CO oxidation, Ion Implantation, Electronic Structure, XANES, Fine Structure Constant, Room Temperature, Magnetic Circular Dichroism, Ferromagnetism, Zno Thin Film, X ray Absorption, Crystal field, Ion Irradiation, and Heavy Ions
This article reports the study on a new generation bioactive ceramic, based on MgKPO(4) (Magnesium Potassium Phosphate, abbreviated as MKP) for biomedical applications. A series of heat treatment experiments on the slip cast silica... more
This article reports the study on a new generation bioactive ceramic, based on MgKPO(4) (Magnesium Potassium Phosphate, abbreviated as MKP) for biomedical applications. A series of heat treatment experiments on the slip cast silica (SiO(2)) containing MKP ceramics were carried out at 900, 1,000 and 1,100 degrees C for 4 h in air. The density of the slip cast ceramic increases to 2.5 gm/cm(3) upon heat treatment at 900 degrees C. However, no significant change in density is measured upon heat treatment to higher temperature of 1,000 and 1,100 degrees C. On the basis of XRD results, the presence of K(2)MgSi(5)O(12) and dehydrated MgKPO(4) were confirmed and complementary information has also been obtained using FT-IR and Raman spectroscopy. In order to confirm the in vitro cytocompatibility property, the cell culture tests were carried out on selected samples and the results reveal good cell adhesion and spreading of L929 mouse fibroblast cells. MTT assay analysis with L929 cells confirmed non-cytotoxic behavior of MKP containing ceramics and the results are comparable with sintered HAp ceramics. It is expected that the newly developed MKP based materials could be a good substitute for hydroxyapatite (HAp or HA) based bioceramics.
Research Interests: Materials Engineering, Materials Science, Biomedical Engineering, Hydroxyapatite, Cell Adhesion, and 15 moreMaterials, Heat Treatment, Medicine, Cell Culture, Ceramics, Magnesium, Mice, Animals, Ceramic, Fourier transform infrared spectroscopy, Materials Testing, Cell Survival, Biomedical Application, MTT assay, and fibroblasts
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Research Interests: Chemistry, Organic Chemistry, Catalysis, Medicine, Escherichia coli, and 15 moreIodine, Bacteria, Staphylococcus aureus, Staphylococcus epidermidis, Gram Positive Bacteria, Antibacterial activity, MDR Salmonella typhi, Bacillus subtilis, Pyrimidine, Microbial Sensitivity Tests, Antibacterial Agent, Molecular Structure, Pharmacology and pharmaceutical sciences, Salmonella Typhi, and Minimum Inhibitory Concentration
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We have studied the structural and superconducting properties of MgB2 thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of... more
We have studied the structural and superconducting properties of MgB2 thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature (Tc0) of 34 K and a zero-field critical current density (Jc) of 1.3×106 A/cm2 were obtained. The irreversibility field was ∼8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB2 Josephson junction technologies.
Research Interests: Engineering, Physics, Condensed Matter Physics, Materials Science, Superconductivity, and 11 moreScience, Applied Physics, Transmission Electron Microscopy, Nanocrystalline Material, Pulsed Laser Deposition, Thin Film, Physical sciences, Superconductors, Grain size, Cross Section, and Low Temperature
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Exploiting hyperlink information has revolutionized search algorithms for the Web [8, 2]. Asthe Web grows, its link structure, along with content, evolves at a rapid rate. Consequently,large-scale static hyperlink-based ranking... more
Exploiting hyperlink information has revolutionized search algorithms for the Web [8, 2]. Asthe Web grows, its link structure, along with content, evolves at a rapid rate. Consequently,large-scale static hyperlink-based ranking computations become too expensive to be performedfrequently.
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Abstract A strong query for a target document with respect to an index is the smallest query for which the target document is returned by the index as the top result for the query. The strong query problem was first studied more than a... more
Abstract A strong query for a target document with respect to an index is the smallest query for which the target document is returned by the index as the top result for the query. The strong query problem was first studied more than a decade ago in the context of measuring search engine overlap. Despite its simple-to-state nature and its longevity in the field, this problem has not been sufficiently addressed in a formal manner.