550 research outputs found

    Annotation of Five Genes in the DNA Mismatch Repair Pathway of Kytococcus Sedentarius

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    Annotation of Five Genes in DNA Mismatch Repair Pathway of Kytococcus Sedentarius Joseph M. Gawron, Rama Dey-Rao, Ph.D., Stephen T. Koury, Ph.D. Department of Biotechnical and Clinical Laboratory Sciences, School of Medicine and Biomedical Sciences, State University of New York University at Buffalo, 26 Cary Hall, 3435 Main Street, Buffalo, NY 14214 Background information: Kytococcus sedentarius is an opportunistic pathogen that can survive on and inside humans. Understanding the genetics of this organism and its biologic pathways can lead to better treatments in addition to possible uses of the gene protein products it produces. Purpose: The purpose of this study was to use in silico gene annotation to characterize five genes in the DNA mismatch repair pathway of K. sedentarius. Methods: This study used the IMG-ACT website to record data in a digital notebook. The gene details page was accessed for basic information on each gene. Databases such as BLAST, CDD, TIGRFAM, PDB, PSORT-B, MetaCyc, and Prosite were used to collect qualitative and quantitative data for the five genes, including similar genes in other organisms, functional families, crystal structures, localization, and the presence of necessary functional residues. Websites like Phylogeny.fr, Pfam, KEGG, TMHMM, SignalP, Web Logo, and Phobius were used to generate diagrams that used in the analysis. Conclusions: The proposed annotations for all five genes were confirmed. The genes were found to be phylogenetically conserved between K. sedentarius and multiple orthologs. Keywords: Gene annotation, Kytococcus sedentarius, DNA mismatch repair, BLAST, orthologs, horizontal gene transfer, DNA sequence conservatio

    Noisy quantum Monty Hall game

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    The influence of spontaneous emission channel and generalized Pauli channel on quantum Monty Hall Game is analysed. The scheme of Flittney and Abbott is reformulated using the formalism of density matrices. Optimal classical strategies for given quantum strategies are found. The whole presented scheme illustrates how quantum noise may change the odds of a zero-sum game.Comment: 10 pages, 3 figure

    Noise Effects in Quantum Magic Squares Game

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    In the article we analyse how noisiness of quantum channels can influence the magic squares quantum pseudo-telepathy game. We show that the probability of success can be used to determine characteristics of quantum channels. Therefore the game deserves more careful study aiming at its implementation.Comment: 5 figure

    Unintegrated gluon distributions and Higgs boson production in proton-proton collisions

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    Inclusive cross sections for Higgs boson production in proton-proton collisions are calculated in the formalism of unintegrated gluon distributions (UGDF). Different UGDF from the literature are used. Although they were constructed in order to describe the HERA deep-inelastic scattering F2F_2 data, they lead to surprisingly different results for Higgs production. We present both two-dimensional invariant cross section as a function of Higgs rapidity and transverse momentum, as well as corresponding projections on rapidity or transverse momentum. We quantify the differences between different UGD's by applying different cuts on interrelations between transverse momentum of Higgs and transverse momenta of both fusing gluons. We focus on large rapidity region. The interplay of the gluon-gluon fusion and weak-boson fusion in rapidity and transverse momentum is discussed. We find that above pTp_T \sim 50-100 GeV the weak-gauge-boson fusion dominates over gluon-gluon fusion.Comment: 32 pages, 18 figures, corrected version, restructured, misprints removed, discussion added, new figure added, in print in EPJ

    Extending scientific computing system with structural quantum programming capabilities

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    We present a basic high-level structures used for developing quantum programming languages. The presented structures are commonly used in many existing quantum programming languages and we use quantum pseudo-code based on QCL quantum programming language to describe them. We also present the implementation of introduced structures in GNU Octave language for scientific computing. Procedures used in the implementation are available as a package quantum-octave, providing a library of functions, which facilitates the simulation of quantum computing. This package allows also to incorporate high-level programming concepts into the simulation in GNU Octave and Matlab. As such it connects features unique for high-level quantum programming languages, with the full palette of efficient computational routines commonly available in modern scientific computing systems. To present the major features of the described package we provide the implementation of selected quantum algorithms. We also show how quantum errors can be taken into account during the simulation of quantum algorithms using quantum-octave package. This is possible thanks to the ability to operate on density matrices

    Numerical simulations of mixed states quantum computation

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    We describe quantum-octave package of functions useful for simulations of quantum algorithms and protocols. Presented package allows to perform simulations with mixed states. We present numerical implementation of important quantum mechanical operations - partial trace and partial transpose. Those operations are used as building blocks of algorithms for analysis of entanglement and quantum error correction codes. Simulation of Shor's algorithm is presented as an example of package capabilities.Comment: 6 pages, 4 figures, presented at Foundations of Quantum Information, 16th-19th April 2004, Camerino, Ital

    Nonphotonic electrons at RHIC within ktk_t-factorization approach and with experimental semileptonic decay functions

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    We discuss production of nonphotonic electrons in proton-proton scattering at RHIC. The distributions in rapidity and transverse momentum of charm and bottom quarks/antiquarks are calculated in the ktk_t-factorization approach. We use different unintegrated gluon distributions from the literature. The hadronization of heavy quarks is done by means of Peterson and Braaten et al. fragmentation functions. The semileptonic decay functions are found by fitting recent semileptonic data obtained by the CLEO and BABAR collaborations. We get good description of the data at large transverse momenta of electrons and find a missing strength concentrated at small transverse momenta of electrons. Plausible missing mechanisms are discussed.Comment: 16 pages, 11 figure

    Inclusive production of J/ψJ/\psi meson in proton-proton collisions at BNL RHIC

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    Inclusive cross sections for J/ψJ/\psi production in proton-proton collisions were calculated in the ktk_t-factorization approach for the RHIC energy. Several mechanisms were considered, including direct color-singlet mechanism, radiative decays of χc\chi_c mesons, decays of ψ\psi', open-charm associated production of J/ψJ/\psi as well as weak decays of B mesons. Different unintegrated gluon distributions from the literature were used. We find that radiative χc\chi_c decays and direct color-singlet contributions constitute the dominant mechanism of J/ψJ/\psi production. These process cannot be consistently treated within collinear-factorization approach. The results are compared with recent RHIC data. The new precise data at small transverse momenta impose stringent constraints on UGDFs. Some UGDFs are inconsistent with the new data. The Kwieci\'nski UGDFs give the best description of the data. In order to verify the mechanism suggested here we propose J/ψJ/\psi -- jet correlation measurement and an independent measurement of χc\chi_c meson production in π+π\pi^+ \pi^- and/or K+KK^+ K^- decay channels. Finally, we address the issue of \J spin alignment.Comment: 26 pages, 20 figures, the text was slightly modified, the title was modified, more discussion was added, one figure was removed, one was adde

    A Simplified Cellular Automaton Model for City Traffic

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    We systematically investigate the effect of blockage sites in a cellular automaton model for traffic flow. Different scheduling schemes for the blockage sites are considered. None of them returns a linear relationship between the fraction of ``green'' time and the throughput. We use this information for a fast implementation of traffic in Dallas.Comment: 12 pages, 18 figures. submitted to Phys Rev
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