Browsing Prof. Indrani Bose by Issue Date

Now showing items 1-20 of 22

    • Reaction-diffusion processes on random and scale-free networks 

      Banerjee, Subhasis; Mallick, S.B.; Bose, Indrani (WORLD SCIENTIFIC PUBL CO PTE LTD, 2004-10-01)
      We study the discrete Gierer-Meinhardt model of reaction-diffusion on three different types of networks: regular, random and scale-free. The model dynamics lead to the formation of stationary Turing patterns in the steady ...

    • Graded and binary responses in stochastic gene expression 

      Karmakar, Rajesh; Bose, Indrani (IOP Publishing Ltd., 2004-12-01)
      Recently, several theoretical and experimental studies have been undertaken to probe the effect of stochasticity on gene expression (GE). In experiments, the GE response to an inducing signal in a cell, measured by the ...

    • Spin gap antiferromagnets: Materials and phenomena 

      Bose, Indrani (CURRENT SCIENCE ASSN, 2005-01-10)
      There are several interacting spin systems which have a gap in their spin excitation spectra. The gap does not occur due to anisotropies present in the system but is quantum mechanical in origin. We give a brief overview ...

    • Motifs in gene transcription regulatory networks 

      Bose, Indrani; Ghosh, Bhaswar; Karmakar, Rajesh (ELSEVIER SCIENCE BV, 2005-02-01)
      A brief overview is given of the structure and evolution of gene transcription regulatory networks (GTRNs) of simple organisms like Escherichia coli and yeast Saccharomyces cerevisiae. A prominent motif appearing in the ...

    • Noise characteristics of feed forward loops 

      Ghosh, Bhaswar; Karmakar, Rajesh; Bose, Indrani (IOP PUBLISHING LTD, 2005-03-01)
      A prominent feature of gene transcription regulatory networks is the presence in large numbers of motifs, i.e., patterns of interconnection, in the networks. One such motif is the feed forward loop (FFL) consisting of three ...

    • Thermal entanglement properties of small spin clusters 

      Bose, Indrani; Tribedi, Amit (AMER PHYSICAL SOC, 2005-08-01)
      Exchange interactions in spin systems can give rise to quantum entanglement in the ground and thermal states of the systems. We consider a spin tetramer, with spins of magnitude 1 2, in which the spins interact via ...

    • Gene copy number and cell cycle arrest 

      Ghosh, B.; Bose, Indrani (IOP PUBLISHING LTD, 2006-03-01)
      The cell cycle is an orderly sequence of events which ultimately lead to the division of a single cell into two daughter cells. In the case of DNA damage by radiation or chemicals, the damage checkpoints in the G1 and G2 ...

    • Entangled spin clusters: Some special features 

      Tribedi, A.; Bose, Indrani (AMERICAN PHYSICAL SOC, 2006-07-01)
      In this paper, we study three specific aspects of entanglement in small spin clusters. We first study the effect of inhomogeneous exchange coupling strengths on the entanglement properties of the S= 1 2 antiferromagnetic ...

    • Stochastic model of transcription factor-regulated gene expression 

      Karmakar, R.; Bose, Indrani (IOP PUBLISHING LTD, 2006-09-01)
      We consider a stochastic model of transcription factor (TF)-regulated gene expression. The model describes two genes, gene A and gene B, which synthesize the TFs and the target gene proteins, respectively. We show through ...

    • Bistability: a universal theme 

      Bose, Indrani (Indian Society of Cell Biology, 2007-01-01)
      T he concept of bistability is well-established in the study of dynamical systems [1]. The key feature of a dynamical system is that the state of the system changes as a function of time. The living cell offers several ...

    • Positive feedback, stochasticity and genetic competence 

      Karmakar, R.; Bose, Indrani (IOP PUBLISHING LTD, 2007-03-01)
      A single gene, regulating its own expression via a positive feedback loop, constitutes a common motif in gene regulatory networks and signalling cascades. Recent experiments on the development of competence in the bacterial ...

    • GENE EXPRESSION IS NOISY 

      Bose, Indrani (Indian Science News Association, 2007-04-01)
      Gene expression, leading to protein synthesis, involves biochemical events which are probabilistic in nature. The stochastic effects are prominent when the number of participating molecules is small or the transitions ...

    • Quantum critical point and entanglement in a matrix-product ground state 

      Tribedi, A.; Bose, Indrani (Elsevier B.V., 2007-04-03)
      In this paper, we study the entanglement properties of a spin-1 model, the exact ground state of which is given by a matrix product (MP) state. The model exhibits a critical point transition at a parameter value a=0. The ...

    • The p53-MDM2 network: From oscillations to apoptosis 

      Bose, Indrani; Ghosh, B. (INDIAN ACAD SCIENCES,, 2007-08-01)
      The p53 protein is well-known for its tumour suppressor function. The p53-MDM2 negative feedback loop constitutes the core module of a network of regulatory interactions activated under cellular stress. In normal cells, ...

    • Entanglement and fidelity signatures of quantum phase transitions in spin liquid models 

      Tribedi, A.; Bose, Indrani (AMER PHYSICAL SOC, 2008-03-01)
      We consider a spin ladder model which is known to have matrix product states as exact ground states with spin liquid characteristics. The model has two critical-point transitions at the parameter values u=0 and. We study ...

    • Functional characteristics of a double positive feedback loop coupled with autorepression 

      Banerjee, S.; Bose, Indrani (IOP PUBLISHING LTD, 2008-12-01)
      We study the functional characteristics of a two-gene motif consisting of a double positive feedback loop and an autoregulatory negative feedback loop. The motif appears in the gene regulatory network controlling the ...

    • Spin- 1 2 Heisenberg ladder: Variation of entanglement and fidelity measures close to quantum critical points 

      Tribedi, A.; Bose, Indrani (AMER PHYSICAL SOC, 2009-01-05)
      We consider a two-chain, spin-1/2 antiferromagnetic Heisenberg spin ladder in an external magnetic field H. The spin ladder is known to undergo second-order quantum phase transitions (QPTs) at two critical values H(c1) and ...

    • Entanglement in a molecular three-qubit system 

      Pal, Amit Kumar; Bose, Indrani (IOP PUBLISHING LTD, 2010-01-13)
      We study the entanglement properties of a molecular three-qubit system described by the Heisenberg spin Hamiltonian with anisotropic exchange interactions and including an external magnetic field. The system exhibits ...

    • Motion of bound domain walls in a spin ladder 

      Bose, Indrani; Pal, A. K. (Springer, 2010-09-01)
      The elementary excitation spectrum of the spin-1/2 antiferromagnetic (AFM) Heisenberg chain is described in terms of a pair of freely propagating spinons. In the case of the Ising-like Heisenberg Hamiltonian spinons can ...

    • Phenotypic Heterogeneity in Mycobacterial Stringent Response 

      Ghosh, Sayantari; Sureka, Kamakshi; Ghosh, Bhaswar; Bose, Indrani; Basu, Joyoti; Kundu, Manikuntala (Biomed Central, 2011-01-27)
      Background: A common survival strategy of microorganisms subjected to stress involves the generation of phenotypic heterogeneity in the isogenic microbial population enabling a subset of the population to survive under ...