307 research outputs found
Photoemission studies of the near Fermi level spectral weight shifts in FeSe1-xTex superconductor
Our valence band photoelectron spectroscopic studies show a temperature
dependent spectral weight transfer near the Fermi level in the Fe-based
superconductor FeSe1-xTex. Using theoretical band structure calculations we
have shown that the weight transfer is due to the temperature induced changes
in the Fe(Se,Te)4 tetrahedra. These structural changes lead to shifts in the
electron occupancy from the xz/yz and x2-y2 orbitals to the 3z2-r2 orbitals
indicating a temperature induced crossover from a metallic state to an Orbital
Selective Mott (OSM) Phase. Our study presents the observation of a temperature
induced crossover to a low temperature OSM phase in the family of Fe
chalcogenides.Comment: 10 pages, 4 figure
Culture‑proven disseminated Mycobacterium Bovis infection (BCG‑Osis) following intravesical BCG immunotherapy in a patient with bladder carcinoma‑in‑situ: ‘Case report’.
We are reporting a case of culture-proven disseminated Mycobacterium Bovis infection (BCG-Osis), involving lung, bone-marrow and urinary tract, after intravesical Bacillus Calmette–Guérin (BCG) immunotherapy for bladder carcinoma-in-situ. A 71-year-gentleman presented with fever shortly after intravesical BCG instillation. He was initially treated for presumed Urinary Tract Infection, but negative urine culture and persistent fever prompted us to consider alternative diagnoses. Empirical treatment for BCG-Osis was commenced after initial negative workup including blood culture, echocardiography, computed tomography (CT) Chest, and Kidney-Ureter-Bladder (KUB). However, he remained febrile and leukopenic, so bone-marrow examination was performed along with repeating CT Chest, which revealed non-caseating granulomas and small nonspecific pulmonary nodules, respectively, supporting our provisional diagnosis. Interestingly, Mycobacterium Bovis was finally isolated from one of his urine specimens, confirming our diagnosis
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LiDAR mapping of tidal marshes for ecogeomorphological modelling in the TIDE project
The European research project TIDE (Tidal Inlets Dynamics and Environment) is developing and validating coupled models describing the morphological, biological and ecological evolution of tidal environments. The interactions between the physical and biological processes occurring in these regions requires that the system be studied as a whole rather than as separate parts. Extensive use of remote sensing including LiDAR is being made to provide validation data for the modelling.
This paper describes the different uses of LiDAR within the project and their relevance to the TIDE science objectives. LiDAR data have been acquired from three different environments, the Venice Lagoon in Italy, Morecambe Bay in England, and the Eden estuary in Scotland. LiDAR accuracy at each site has been evaluated using ground reference data acquired with differential GPS. A semi-automatic technique has been developed to extract tidal channel networks from LiDAR data either used alone or fused with aerial photography. While the resulting networks may require some correction, the procedure does allow network extraction over large areas using objective criteria and reduces fieldwork requirements. The networks extracted may subsequently be used in geomorphological analyses, for example to describe the drainage patterns induced by networks and to examine the rate of change of networks. Estimation of the heights of the low and sparse vegetation on marshes is being investigated by analysis of the statistical distribution of the measured LiDAR heights. Species having different mean heights may be separated using the first-order moments of the height distribution
FOOD CONSUMPTION AND NUTRITIONAL INDICES OF OAK TASAR WORM ANTHERAEA PROYLEI (JOLLY) FED ON QUERCUS GLAUCA
Studies were conducted under laboratory conditions to evaluate the food consumption and nutritional indices for the development of Antheraea proylei larvae fed on Quercus glauca. Larval duration was 5.4±0.489, 6.4±0.48, 7.2±0.4, 9.8±0.74 and 14.2±0.74 days in the 1st, 2nd, 3rd, 4th and 5th instars, respectively. Larvae consumed a total of 28.85 g insect– ¹ day– ¹, egested 4.164 g insect– ¹ day– ¹ and assimilated 24.69 g insect– ¹ day– ¹ of food provided. 82.3% of tissue growth was observed in the 4th and 5th instar larvae. Approximate digestibility (AD) decreased from 91.94% in the first instar larva to 80.79% in the 5th instar larva. Efficiency of conversion of digested food (ECD) into body tissue and efficiency of conversion of ingested food into growth (ECI) increased from 1st instar larva to 5th instar larva. The result obtained in the present study indicate that Q. glauca could serve as an alternate host plant for rearing A. proylei in areas where the main host plant Q. serrata is not found
Fermi surface and band structure of BiPd from ARPES studies
We present a detailed electronic structure study of the non-centrosymmetric
superconductor BiPd based on our angle resolved photoemission spectroscopy
(ARPES) measurements and Density Functional Theory (DFT) based calculations. We
observe a high intensity distribution on the Fermi surface (FS) of this
compound resulting from various electron and hole like bands which are present
in the vicinity of the Fermi energy (E). The near E states are
primarily composed of Bi-6p with a little admixture of Pd-4d
orbitals. There are various spin-orbit split bands involved in the crossing of
E making a complex FS. The FS mainly consists of multi sheets of three
dimensions which disfavor the nesting between different sheets of the FS. Our
comprehensive study elucidates that BiPd could be a s-wave multiband
superconductor
Valence band electronic structure of Nb2Pd1.2Se5 and Nb2Pd0.95S5 superconductors
We present a comparative study of our valence band photoemission results on
Nb2Pd1.2Se5 and Nb2Pd0.95S5 superconductors which is supported by our DFT based
electronic structure calculations. We observe that the VB spectra of both the
compounds are qualitatively similar, except slight difference in the binding
energy position of all features between the two compounds which could be the
result of different electronegativity of Se and S atom. The calculated density
of states reveal that the VB features are mainly composed of Pd Se S hybridized
states. The nature of DOS originating from the distinctly coordinated Pd atoms
is different. Further, the involvement of the various Pd 4d and Nb 4d states in
crossing of Fermi level signifies the multiband character of these compounds.
In addition, we find a temperature dependent pseudogap in Nb2Pd0.95S5 which is
absent in Nb2Pd1.2Se5
Valence band electronic structure of Pd based ternary chalcogenide superconductors
We present a comparative study of the valence band electronic structure of Pd
based ternary chalcogenide superconductors Nb2Pd0.95S5, Ta2Pd0.97S6 and
Ta2Pd0.97Te6 using experimental photoemission spectroscopy and density
functional based theoretical calculations. We observe a qualitatively
similarity between valence band (VB) spectra of Nb2Pd0.95S5 and Ta2Pd0.97S6.
Further, we find a pseudogap feature in Nb2Pd0.95S5 at low temperature, unlike
other two compounds. We have correlated the structural geometry with the
differences in VB spectra of these compounds. The different atomic packing in
these compounds could vary the strength of inter-orbital hybridization among
various atoms which leads to difference in their electronic structure as
clearly observed in our DOS calculations
Molecular Docking of Known Carcinogen 4- (Methyl-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK) with Cyclin Dependent Kinases towards Its Potential Role in Cell Cycle Perturbation
Cell cycle is maintained almost all the times and is controlled by various regulatory proteins and their complexes (Cdk+Cyclin) in different phases of interphase (G1, S and G2) and mitosis of cell cycle. A number of mechanisms have been proposed for the initiation and progression of carcinogenesis by abruption in cell cycle process. One of the important features of cancer/carcinogenesis is functional loss of these cell cycle regulatory proteins particularly in CDKs and cyclins. We hypothesize that there is a direct involvement of these cell cycle regulatory proteins not only at the genetic level but also proteins level, during the initiation of carcinogenesis. Therefore, it becomes significant to determine inconsistency in the functioning of regulatory proteins due to interaction with carcinogen 4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK). Hence, we investigated the interaction efficiency of NNK, against cell cycle regulatory proteins. We found a different value of ΔG (free energy of binding) among the studied proteins ranging between -3.29 to -7.25 kcal/mol was observed. To validate the results, we considered Human Oxy-Hemoglobin at 1.25 Å Resolution, [PDB_ID:1HHO] as a +ve control, (binding energy -6.06 kcal/mol). Finally, the CDK8 (PDB_ID:3RGF) and CDK2 (PDB_ID:3DDP) regulatory proteins showing significantly strong molecular interaction with NNK -7.25 kcal/mol, -6.19 kcal/mol respectively were analyzed in details. In this study we predicted that CDK8 protein fails to form functional complex with its complementary partner cyclin C in presence of NNK. Consequently, inconsistency of functioning in regulatory proteins might lead to the abruption in cell cycle progression; contribute to the loss of cell cycle control and subsequently increasing the possibility of carcinogenesis
Observation of Dirac-like surface state bands on the top surface of BiSe
Two quintuple layers of strong topological insulator Bi2Se3 are coupled by a
Bi bilayer in BiSe crystal. We investigated its electronic structure using
angle resolved photoelectron spectroscopy to study its topological nature.
Dirac like linearly dispersive surface state bands are observed on the 001
surface of BiSe and Sb doped BiSe, similar to Bi2Se3. Moreover, the lower part
of the SSBs buries deep in the bulk valence band. Overlap region between the
SSBs and BVB is large in Sb doped system and the SSBs deviate from the Dirac
like linear dispersion in this region.
These results highlight the role of interlayer coupling between the Bi
bilayer and the Bi2Se3 QLs.
Furthermore, we observed a large intensity imbalance in the SSBs located at
the positive and negative k parallel directions. This asymmetry pattern
gradually reverses as the excitation energy scans from low 14eV to high 34eV
value. However, we did not observe signal of surface magnetization resulting
from the intensity imbalance in SSBs due to hole-generated uncompensated spin
accumulation in the photoexcitation process. The main reason for this could be
the faster relaxation process for photo hole due to the presence of the Bi
bilayer between the adjacent Bi2Se3 QLs. The observed photon energy dependent
intensity variation could be a signature of the mixing between the spin and the
orbit texture of the SSBs
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