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Search Results: 1 - 10 of 463581 matches for " A. Banerjee "
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Pathology of cerebrovascular disease.
Banerjee A
Neurology India , 2000,
Self-assembling cyclic systems as drug carriers
A. Banerjee,A. Yadav
Applied Nanoscience , 2013, DOI: 10.1007/s13204-012-0154-0
Abstract: Self-assembling cyclic systems have been of interest to researchers for over a decade now, and their wide variety applications have been explored from electronic devices to medicinal purposes. But still their discovery for newer innovative applications remains as valuable as before. In this study, ab initio Hartree–Fock molecular orbital calculations have been performed on peptidic and peptidomimetic cyclic compounds to identify characteristics required in compounds for efficient self-aggregation. The effect of these characteristics in determining the pore size and length of nanotube has been studied. Effect of backbone and substituents on environment of outer and inner surface and carriage properties has been studied in detail. Self-aggregating compounds (Ala)12 and (Ala)10 have been predicted to form a tubular structure with dimensions in nanoscale. They have been predicted to work as novel drug carriers having inert outer wall and inner pore. A peptidic self-aggregating compound (Ala)12 has been studied and suggested as carrier for antibiotic gentamicin to exemplify carriage properties of the designed compound. Such novel self-aggregatory systems are expected to help simplify the drug delivery process and increase bioavailability of various drugs.
In Silico Design of a Peptidomimetic Carrier for Levodopa
A. Banerjee,A. Yadav
International Journal of Biomedical Science , 2011,
Abstract: Ab initio molecular orbital calculations at the Hartree Fock level utilizing 6-31G basis set have been performed on small cyclic peptides and peptidomimetic compounds to explore their utility as carriers of levodopa (L-3,4-dihydroxyphenylalanine) to enhance its brain bioavailability. A cyclic peptidomimetic compound with hydrophobic CH2NH backbone is suggested as possible carrier. This carrier is predicted to efficiently carry Levodopa held by non covalent interactions encompassed in its cyclic backbone without chances of expulsion before delivery inside brain. Carrier is expected to undergo passive diffusion alongwith the drug held inside. Once inside the brain, drug may be delivered enzymatically or non enzymatically.
Optical Control of Millmeter-wave Lateral Double-Drift Region Silicon IMPATT Device
A. Acharyya,S. Banerjee,J. P. Banerjee
Radioengineering , 2012,
Abstract: The effect of optical illumination on lateral Double-Drift Region (DDR) structure of Silicon Impact Avalanche Transit Time (IMPATT) device is investigated in this paper. The device is designed to operate at mm-wave W-band frequency. The optical modulation of DC and RF properties of lateral DDR IMPATT device is studied by a simulation technique which incorporates the dependence of normalized difference of photocurrent density at the depletion layer edges on the intensity of optical illumination and surface density of photon flux. The simulation results are compared with those obtained for a conventional vertical DDR Si IMPATT structure under similar optical and electrical operating conditions. The results show that the optical control is more effective in lateral IMPATT structure than in its vertical counterpart as regards reduction of output power and shifting of optimum frequency. When light is incident on hole drift layer of the lateral structure the output power reduces by 18.7% while the optimum frequency shifts upwards by 2.48%. Under similar conditions the power reduces by 10.9% and optimum frequency shifts upwards by 0.75% in vertical structure.
Large-Signal Simulation of 94 GHz Pulsed Silicon DDR IMPATTs Including the Temperature Transient Effect
A. Acharyya,S. Banerjee,J. P. Banerjee
Radioengineering , 2012,
Abstract: In this paper large-signal modeling and simulation has been carried to study the frequency chirping due to temperature transients and the large-signal power and efficiency of pulsed silicon Double-Drift Region (DDR) Impact Avalanche Transit Time (IMPATT) device operating at 94 GHz. A large-signal simulation method based on non-sinusoidal voltage excitation incorporating the transient thermal effect has been developed by the authors. Results show that the device is capable of delivering a peak pulsed power output of 17.5 W with 12.8% efficiency when the voltage modulation is 60%. The maximum junction temperature rise is 350.2 K for a peak pulsed bias current of 6.79 A with 100 ns pulsewidth and 0.5 percent duty cycle; whereas the chirp bandwidth is 8.3 GHz.
Status of dermatology in the coal Belts of eastern India
Sen A,Banerjee Kalyan,Banerjee Raghubir
Indian Journal of Dermatology, Venereology and Leprology , 1996,
Abstract: Health survey of 2 major coal mines in Eastern India reveals that skin lesions are very common. Out of usual skin lesions occupational dermatitis tops the list. Health statistics show that dermatological problems are the third major health hazard in mines.
Lymphocutaneous sporotrichosis treated with three different modalities
Banerjee S,Jaiswal A
Indian Journal of Dermatology, Venereology and Leprology , 2003,
Abstract: Three cases of lymphocutaneous sporotrichosis were treated with three different modalities and oral saturated solution of potassium iodide was found to be best modality.
Tapeto retinal degeneration (progressive retinitis punctata albescens) with anterior and posterior lenticonus (a case report)
Banerjee B,Das A
Indian Journal of Ophthalmology , 1972,
A case of 27 year old male with recurrent neurological deficit.
Banerjee A,Prabhakar S
Neurology India , 1999,
Changeover from Glassy ferromagnetism of the orbital domain state to long range ferromagnetic ordering in La{_{0.9}}Sr_{0.1}MnO{_3}
K. Mukherjee,A. Banerjee
Physics , 2007, DOI: 10.1103/PhysRevB.77.024430
Abstract: An attempt is made to resolve the controversy related to the low temperature phase (ground state) of the low-doped ferromagnetic (FM)- insulator(I) manganite through bulk magnetic measurements on La${_{0.9}}$Sr$_{0.1}$MnO${_3}$ sample. It is shown that the FM phase, formed out of well defined transition in the low-doped system, becomes inhomogeneous with decrease in temperature. This inhomogeniety is considered to be an outcome of the formation of orbital domain state of e$_g$-electrons having hole rich (metallic) walls separating the hole deficient (insulating) regions. The resulting complexity brings in metastability and glassy behaviour within the FM phase at low temperature, however, with no resemblance to spin glass, cluster glass or reentrant phases. It shows ageing effect without memory but magnetic relaxation shows signatures of inter-cluster interaction. The energy landscape picture of this glassy phase is described in terms of hierarchical model. Further, it is shown that this inhomogeneity disappear in La${_{0.9}}$Sr$_{0.1}$MnO$_{3.08}$ where, the orbital domain state is destroyed by self doping resulting in reduction of Mn$^{3+}$ and hence e$_g$-electrons. The ferromagnetic phase of the non-stoichiometric sample, does not show glassy behaviour. It neither follows 'hierarchical model' nor 'droplet model' generally used to explain glassy or inhomogeneous systems. Its magnetic response can be explained simply from the domain wall dynamics of otherwise homogeneous ferromagnet.
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