The spectral and temporal properties of an Ultra-Luminous X-ray source in NGC 6946 (2008)
Devi, A. Senorita, Misra, R., Shanthi, K., Singh, K. Y.
We report variability of the X-ray source, X-7, in NGC 6946, during a 60 ksec Chandra observation when the count rate decreased by a factor of ~1.5 in ~5000 secs. Spectral fitting of the high and low...
Damped harmonic oscillator interpretation of the soft-state power spectra of Cyg X-1 (2008)
We develop a model of an accretion disc in which the variability induced at a given radius is governed by a damped harmonic oscillator at the corresponding epicyclic frequency. That variability...
The dependence of the estimated luminosities of ULX on spectral models (2007)
Devi, A. Senorita, Misra, R., Agrawal, V. K., Singh, K. Y.
Data from {\it Chandra} observations of thirty nearby galaxies were analyzed and 365 X-ray point sources were chosen whose spectra were not contaminated by excessive diffuse emission and not affected...
Use of Medical Library by Medical Students and Teachers in Medical Colleges of Kolkata (2006)
Chatterjee, C, Joardar, G, Bhattachrrya, K, Nandy, S, Misra, R
Bhattacharyya, S., Bhatt, N., Misra, R.
In the inner regions of an accretion disk around a black hole, relativistic protons can interact with ambient matter to produce electrons, positrons and $\gamma$-rays. The resultant steady state...
The non-linear behavior of the black hole system GRS 1915+105 (2006)
Misra, R., Harikrishnan, K. P., Ambika, G., Kembhavi, A. K.
Using non-linear time series analysis, along with surrogate data analysis, it is shown that the various types of long term variability exhibited by the black hole system GRS 1915+105, can be...
A non subjective approach to the GP algorithm for analysing noisy time series (2006)
Harikrishnan, K. P., Misra, R., Ambika, G., Kembhavi, A. K.
We present an adaptation of the standard Grassberger-Proccacia (GP) algorithm for estimating the Correlation Dimension of a time series in a non subjective manner. The validity and accuracy of this...
The Unusual Spectrum of the Ultra Luminous X-ray Source, M82 X-1 (2006)
The results of a spectral analysis, using {\it XMM-Newton} and {\it Chandra} data of the brightest ultra luminous X-ray source in the nearby galaxy M82, are presented. The spectrum of M82 X-1, was...
Interpretation of the Radio/X-ray Knots of AGN Jets within the Internal Shock Model Framework (2005)
The dynamics of relativistically moving blobs ejected out of a central AGN, are considered. It is assumed that the collision between two blobs are completely inelastic, such that the bulk kinetic...
On the incidence of KHz quasi-periodic oscillations in the neutron star system 4U 1636-53 (2004)
Nearly $1.32 \times 10^6$ sec of non-zero count rate data were obtained from five years of {\rm RXTE} observations of the atoll source 4U 1636-53. The data was divided into 10309 segments of 128 sec...
The chaotic behavior of the black hole system GRS 1915+105 (2004)
Misra, R., Harikrishnan, K. P., Mukhopadhyay, B., Ambika, G., Kembhavi, A. K.
A modified non-linear time series analysis technique, which computes the correlation dimension $D_2$, is used to analyze the X-ray light curves of the black hole system GRS 1915+105 in all twelve...
The Effect of Non-Thermal Protons on the High Energy Spectra of Black Hole Binaries (2003)
Bhattacharyya, S., Bhatt, N., Misra, R., Kaul, C. L.
In the inner regions of an accretion disk around a black hole, the presence of non-thermal protons would via p-p collisions produce electrons, positrons and $\gamma$-rays. For such a scenario, the...
A Continuous Injection Plasma Model for the X-Ray/Radio Knots in Kpc-Scale Jets of AGN (2003)
Sahayanathan, S., Misra, R., Kembhavi, A. K., Kaul, C. L.
We consider the evolution of a spherically expanding plasma cloud, where there is continuous injection of non-thermal electrons. We compute the time dependent electron distribution and resultant...
Flux enhancement in the inner region of a geometrically and optically thick accretion disk (2002)
The surface flux (and the corresponding observed flux) of a geometrically thick ``funnel'' shaped disk is computed taking into account the radiation impinging on the surface from other parts of the...
General relativistic spectra from accretion disks around rapidly rotating neutron stars (2002)
Bhattacharyya, S., Bhattacharya, D., Misra, R., Thampan, A.V.
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations). The Physics of Cataclysmic Variables and Related Objects, ASP Conference Proceedings, Vol. 261....
Milicic, A, Misra, R, Agrawal, S, Aggarwal, A, Brown, MA, Wordsworth, BP
Objectives: To investigate the association of the FcgammaRIIIA gene with rheumatoid arthritis (RA) in two genetically distinct groups: a white group from the United Kingdom and a northern Indian...
A Compton Up-scattering Model for Soft Lags in the Lower Kilohertz QPO in 4U1608-52 (2001)
Lee, H. C., Misra, R., Taam, R. E.
An empirical Compton up-scattering model is described which reproduces both the fractional amplitude (RMS) vs. energy and the soft time lags in the 830 Hz QPO observed in 4U1608-52 on Mar. 3, 1996. A...
Disparate associations of the FcgammaRIIIa 158/V variant with RA in two diverse populations (2001)
Milicic, A, Misra, R, Brown, MA, Wordsworth, BP
No abstract available.
General relativistic spectra of accretion disks around rotating neutron stars (2000)
Bhattacharyya, S., Misra, R., Thampan, A. V.
General relativistic spectra from accretion disks around rotating neutron stars in the appropriate space-time geometry for several different equation of state, spin rates and mass of the compact...
Hydrodynamical winds from two-temperature plasma in X-ray binaries (2000)
Lin, David J., Misra, R., Taam, Ronald E.
Hydrodynamical winds from a spherical two-temperature plasma surrounding a compact object are constructed. The mass-loss rate is computed as a function of electron temperature, optical depth and...
Bhattacharyya, S., Thampan, A. V., Misra, R., Datta, B.
We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of general relativity....
Comparisons of various model fits to the Iron line profile in MCG-6-30-15 (1999)
The broad Iron line in MCG-6-30-15 is fitted to the Comptonization model where line broadening occurs due to Compton down-scattering in a highly ionized optically thick cloud. These results are...
Comparisons of various model fits to the iron line profile in MCG-6-30-15 (1998)
The broad Iron line in MCG-6-30-15 is fitted to the Comptonization model where line broadening occurs due to Compton down-scattering in a highly ionized optically thick cloud. These results are...
Evidence for advective flow from multi-wavelength observations of Nova Muscae (1998)
We model the UV/optical spectrum of the black hole binary Nova Muscae as a sum of black body emissions from the outer region of an accretion disk. We show for self-consistency that scattering effects...
Broadening of the Iron emission line in MCG-6-30-15 by Comptonization (1997)
We show that the Iron K emission line from MCG-6-30-15 could be broadened due to Comptonization by a surrounding highly ionized cloud with radius $\sim 10^{14}$ cms. We calculate the temperature of...
A fit to the simultaneous broadband spectrum of Cygnus X-1 using the transition disk model (1997)
Misra, R., Chitnis, V. R., Melia, F.
We have used the transition disk model to fit the simultaneous broad band ($2-500$ keV) spectrum of Cygnus X-1 from OSSE and Ginga observations. In this model, the spectrum is produced by saturated...
Broadening of the iron emission line in MCG-6-30-15 bY comptonization (1997)
We show that the Iron K emission line from MCG-6-30-15 could be broadened due to Comptonization by a surrounding highly ionized cloud with radius $\sim 10^{14}$ cms. We calculate the temperature of...
Effect of photo-crystallization on the photoconductivity of a-Se85Te 15 (1990)
Kumar, A., Misra, R., Goel, S., Tripathi, S.K.
The present paper reports the steady state and transient photoconductivity in amorphous Se85Te15 thin films before and after photo-crystallization which is induced by shining white light (3 000 Lux)...
Effect of photo-crystallization on the photoconductivity of a-Se85Te 15 (1990)
Kumar, A., Misra, R., Goel, S., Tripathi, S.K.
The present paper reports the steady state and transient photoconductivity in amorphous Se85Te15 thin films before and after photo-crystallization which is induced by shining white light (3 000 Lux)...
Effect of photo-crystallization on the photoconductivity of a-Se85Te 15 (1990)
Kumar, A., Misra, R., Goel, S., Tripathi, S.K.
The present paper reports the steady state and transient photoconductivity in amorphous Se85Te15 thin films before and after photo-crystallization which is induced by shining white light (3 000 Lux)...
Colonic Bacteria Express an Ulcerative Colitis pANCA-Related Protein Epitope
Cohavy, O., Bruckner, D., Gordon, L. K., Misra, R., Wei, B., Eggena, M. E., ...
Bacteria are a suspected pathogenic factor in inflammatory bowel disease, but the identity of the relevant microbial species remains unresolved. The pANCA autoantibody is associated with most cases...
Assembly-defective OmpC mutants of Escherichia coli K-12.
Xiong, X, Deeter, J N, Misra, R
Novel ompC(Dex) alleles were utilized to isolate mutants defective in OmpC biogenesis. These ompC(Dex) alleles also conferred sensitivity to sodium dodecyl sulfate (SDS), which permitted the...
Kloser, A W, Laird, M W, Misra, R
A novel genetic scheme allowed us to isolate extragenic suppressor mutations that restored mutant OmpF assembly. One group of these mutations, termed asmB for assembly suppressor mutation B,...
This paper describes a novel genetic method used to isolate mutations that alter proper assembly of OmpF in the outer membrane. The thermolabile nature of assembly intermediates allowed selection of...
Assembly of LamB and OmpF in deep rough lipopolysaccharide mutants of Escherichia coli K-12.
Laird, M W, Kloser, A W, Misra, R
Assembly of the OmpF and LamB proteins was kinetically retarded in deep rough lipopolysaccharide mutants of Escherichia coli K-12. OmpF assembly was affected at the step of conversion of metastable...
A mutant of Escherichia coli K-12 which produces a new outer membrane protein, OmpG, was isolated and genetically and biochemically characterized. The presence of OmpG allows growth on maltodextrins...
Isolation and characterization of OmpC porin mutants with altered pore properties.
The LamB protein is normally required for the uptake of maltodextrins. Starting with a LamB- OmpF- strain, we have isolated mutants that will grow on maltodextrins. The mutation conferring the Dex+...
Genetic identification of the pore domain of the OmpC porin of Escherichia coli K-12.
We have isolated and characterized 31 mutations in the ompC gene which allow Escherichia coli to grow on maltotriose (Dex+) in the absence of the LamB and OmpF porins. These ompC(Dex) mutations...
Mutation in the tolC locus greatly reduces normal synthesis of OmpF, a major porin protein of Escherichia coli K-12. Experiments that use ompF-ompC chimeric genes demonstrate that a tolC mutation...
A variety of chemically synthesized oligonucleotides designed on the basis of amino acid and/or nucleotide sequence data were used to detect a large number of novel reverse transcriptase coding...
Misra, R, Matera, A G, Schmid, C W, Rush, M G
An abundant class of HeLa extrachromosomal circular DNA containing the transposon-like element, THE-1, is shown to arise via site specific recombination. The chromosomal locus from which these...
Hazel, T G, Misra, R, Davis, I J, Greenberg, M E, Lau, L F
The rat pheochromocytoma cell line PC12 can be induced by growth factors to undergo proliferation and neuronal differentiation. These cells also have excitable membranes that can be depolarized by...
DiGiovanni, L, Haynes, S R, Misra, R, Jelinek, W R
We have isolated eight cDNA clones complementary to the human Kpn I repeat and determined the base sequence of three. We have also determined a portion of the base sequences of three human Kpn I...
Srivastava, S C, Raza, S K, Misra, R
Synthesis of 1,N6-etheno-2'-deoxyadenosine, 3,N4-etheno-2'-deoxycytidine, and further chemistry on both deoxy and ribo series etheno nucleosides produces the corresponding phosphoramidites. These...
Sampson, B. A., Misra, R., Benson, S. A.
Using a genetic selection for mutations which allow large maltodextrins to cross the outer membrane of Escherichia coli in the absence of the LamB maltoporin, we have obtained and characterized two...
Colonic Bacteria Express an Ulcerative Colitis pANCA-Related Protein Epitope
Cohavy, O., Bruckner, D., Gordon, L. K., Misra, R., Wei, B., Eggena, M. E., ...
Bacteria are a suspected pathogenic factor in inflammatory bowel disease, but the identity of the relevant microbial species remains unresolved. The pANCA autoantibody is associated with most cases...
Assembly-defective OmpC mutants of Escherichia coli K-12.
Xiong, X, Deeter, J N, Misra, R
Novel ompC(Dex) alleles were utilized to isolate mutants defective in OmpC biogenesis. These ompC(Dex) alleles also conferred sensitivity to sodium dodecyl sulfate (SDS), which permitted the...
Kloser, A W, Laird, M W, Misra, R
A novel genetic scheme allowed us to isolate extragenic suppressor mutations that restored mutant OmpF assembly. One group of these mutations, termed asmB for assembly suppressor mutation B,...
This paper describes a novel genetic method used to isolate mutations that alter proper assembly of OmpF in the outer membrane. The thermolabile nature of assembly intermediates allowed selection of...
Assembly of LamB and OmpF in deep rough lipopolysaccharide mutants of Escherichia coli K-12.
Laird, M W, Kloser, A W, Misra, R
Assembly of the OmpF and LamB proteins was kinetically retarded in deep rough lipopolysaccharide mutants of Escherichia coli K-12. OmpF assembly was affected at the step of conversion of metastable...
A mutant of Escherichia coli K-12 which produces a new outer membrane protein, OmpG, was isolated and genetically and biochemically characterized. The presence of OmpG allows growth on maltodextrins...
Isolation and characterization of OmpC porin mutants with altered pore properties.
The LamB protein is normally required for the uptake of maltodextrins. Starting with a LamB- OmpF- strain, we have isolated mutants that will grow on maltodextrins. The mutation conferring the Dex+...