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Shiv Nadar University

(SoNS) School of Natural Sciences

We discuss several PT -symmetric deformations of superderivatives. Based on these various possibilities, we propose new families of complex PT -symmetric deformations of the supersymmetric Korteweg-de Vries equation. Some of these new models are mere fermionic extensions of the former in the sense that they are formulated in terms of superspace-valued superfields containing bosonic and fermionic fields, breaking however the supersymmetry invariance. Nonetheless, we also find extensions, which may be viewed as new supersymmetric Korteweg-de Vries equation. Moreover, we show that these deformations allow for a non-Hermitian Hamiltonian formulation. © 2008 IOP Publishing Ltd.

Physics

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Fulltext

Journal of Physics A: Mathematical and Theoretical

PT -symmetric extensions of the supersymmetric Korteweg-de Vries equation

Bridging the domains of cheminformatics and bioinformatics in the post-genomic era requires the convergence of goals, tools, techniques and annotations. This article reviews recent research at the interface of the domains that shows evidence of this convergence. While graph theoretical representations have long been used to develop simple topological descriptions of molecules, graph theory-based network concepts are also widely employed in systems biology. Shape and conformation are important for understanding intermolecular interactions, and several structure-based cheminformatic descriptors have been developed and applied to drug-like molecules and biomolecules. Data fusion methods and shared ontologies can also help integrate data from multiple sources in order to generate a holistic picture of the shared molecular informatics domain. © The Thomson Corporation.

Chemistry

Current Opinion in Drug Discovery and Development

Bioinformatics and cheminformatics: Where do the twain meet?

Two different coumarin derivatives have been connected via an imine linkage to obtain a new fluorescence signaling system. This compound itself does not show any emission due to rapid isomerization around the C=N bond. However, in the presence of a Mg(II) ion, this isomerization is stopped because of bonding to the metal ion resulting in high-intensity (∼550-fold) emission. Other metal ions like Li(I), Ca(II), and Zn(II) show very little emission, while biologically relevant transition-metal ions do not show any emission. In this way, the Mg(II) ion can be detected in the presence of these ions. © 2008 American Chemical Society.

Inorganic Chemistry

A coumarin-derived fluorescence probe selective for magnesium

This study deals with control of pest population in agricultural ecosystem using sterile insect technique (SIT). A three-dimensional stage-structured model of the pest under the release of sterile male has been considered. This article also considers the effect of this technique under immigration of wild insects in the control area. Moreover, the deterministic model is extended to a stochastic one allowing random fluctuations around the positive interior equilibrium. The stochastic stability properties of the model are investigated, both analytically and numerically. The thresholds of sterile males that obtained from our study might be helpful to understand and implement the technique properly. Copyright © Taylor & Francis Group, LLC.

Mathematics

Stochastic Analysis and Applications

A stage-structured stochastic model of sterile male under immigration

We report here the synthesis, characterization, and organic thin-film transistor (OTFT) mobilities of 4,7-bis(5-(5-hexylthiophen-2-yl)thiophen-2-yl) benzo[1,2,5]thiadiazole (DH-BTZ-4T). DH-BTZ-4T was prepared in one high-yield step from commercially available materials using Suzuki chemistry and purified by column chromatography. OTFTs with hole mobilities of 0.17 cm2/(Vs) and on/off current ratios of 1 × 105 were prepared from DH-BTZ-4T active layers deposited by vacuum deposition. As DH-BTZ-4T is soluble in common solvents, solution processed devices were also prepared by spin coating yielding preliminary mobilities of 6.0 × 10-3 cm 2/(Vs). The promising mobilities and low band gap (1.90 eV) coupled with solution processability and ambient stability makes this material an excellent candidate for application in organic electronics. © 2008 American Chemical Society.

Chemistry of Materials

High-mobility organic thin film transistors based on benzothiadiazole- sandwiched dihexylquaterthiophenes

We have synthesized Mn-doped CdS nanocrystals (NCs) with size ranging from 1.8-3 nm. Photo-luminescence (PL) spectra of the doped NCs differ from that of the undoped NCs with an additional peak due to Mn d-d transitions. Electron paramagnetic resonance spectra along with X-ray absorption spectroscopy and PL spectra confirm the incorporation of Mn in the CdS lattice. The fact that emissions from surface states and the Mn d levels occur at two different energies, allowed us to study the PL lifetime decay behaviour of both kinds of emissions. {\textcopyright} Indian Academy of Sciences.

Bulletin of Materials Science

Luminescence in Mn-doped CdS nanocrystals

Life Sciences

Microbiological Research

Erratum to "In silico mining in expressed sequences of Neurospora crassa for identification and abundance of microsatellites". [Microbiol. Res. 162 (2007) 250-256] (DOI:10.1016/j.micres.2006.05.012)

The mechanism of DNA replication initiation and progression is poorly understood in the parasites, including human malaria parasite Plasmodium falciparum. Using bioinformatics tools and yeast complementation assay, we identified a putative homologue of Saccharomyces cerevisiae origin recognition complex subunit 5 in P. falciparum (PfORC5). PfORC5 forms distinct nuclear foci colocalized with the replication foci marker proliferating cell nuclear antigen (PfPCNA) and co-immunoprecipitates with PCNA during early-to-mid trophozoite stage replicating parasites. Interestingly, these proteins separate from each other at the non-replicating late schizont stage, citing the evidence of the presence of both PCNA and ORC components in replication foci during eukaryotic DNA replication. PfORC1, another ORC subunit, colocalizes with PfPCNA and PfORC5 at the beginning of DNA replication, but gets degraded at the late schizont stage, ensuring the regulation of DNA replication in the parasites. Further, we have identified putative PCNA-interacting protein box in PfORC1 that may explain in part the colocalization of PfORC and PfPCNA. Additionally, use of specific DNA replication inhibitor hydroxyurea affects ORC5/PCNA foci formation and parasitic growth. These results strongly favour replication factory model in the parasites and confer great potential to understand the co-ordination between ORC and PCNA during eukaryotic DNA replication in general. © 2008 The Authors.

Molecular Microbiology

Plasmodium falciparum origin recognition complex subunit 5: Functional characterization and role in DNA replication foci formation

We show that the complex -symmetric periodic potential V(x) = -(iξsin 2x + N)2, where ξ is real and N is a positive integer, is quasi-exactly solvable. For odd values of N ≥ 3, it may lead to exceptional points depending upon the strength of the coupling parameter ξ. The corresponding Schrödinger equation is also shown to go over to the Mathieu equation asymptotically. The limiting value of the exceptional points derived in our scheme is consistent with known branch-point singularities of the Mathieu equation. © 2008 IOP Publishing Ltd.

A complex periodic QES potential and exceptional points

We study theoretically the spin reorientation transition in thin epitaxial films of NiO grown on Ag and MgO. Experimentally, the Ni spins point out-of-plane for films grown on the MgO substrate and in-plane for those on the Ag substrate. We successfully explain these opposite trends in the ground state moments for the two cases and simulate the isotropic x-ray absorption spectrum (XAS) for bulk NiO, in good agreement with experiments, on the basis of cluster configuration interaction calculations based on a NiO6 cluster. {\textcopyright} 2008 American Institute of Physics.