Prof. Indrani Bose
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Recent Submissions
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Noise characteristics of feed forward loops
(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 ... -
Spin gap antiferromagnets: Materials and phenomena
(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
(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 ... -
Graded and binary responses in stochastic gene expression
(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 ... -
Reaction-diffusion processes on random and scale-free networks
(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 ... -
Gene copy number and cell cycle arrest
(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 ... -
Thermal entanglement properties of small spin clusters
(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 ... -
Bistability: a universal theme
(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
(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 ... -
Stochastic model of transcription factor-regulated gene expression
(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 ... -
Entangled spin clusters: Some special features
(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 ... -
Entanglement and fidelity signatures of quantum phase transitions in spin liquid models
(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 ... -
The p53-MDM2 network: From oscillations to apoptosis
(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, ... -
GENE EXPRESSION IS NOISY
(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
(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 ... -
Spin- 1 2 Heisenberg ladder: Variation of entanglement and fidelity measures close to quantum critical points
(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 ... -
Functional characteristics of a double positive feedback loop coupled with autorepression
(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 ... -
Entanglement in a molecular three-qubit system
(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 ... -
Quantum discord in the ground and thermal states of spin clusters
(IOP PUBLISHING LTD, 2011-02-28)Quantum discord (QD) is a general measure of bipartite quantum correlations with a potential role in quantum information processing tasks. Spin clusters serve as ideal candidates for the implementation of some of the ... -
Motion of bound domain walls in a spin ladder
(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 ...
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