1,410 research outputs found
Supersymmetric Yang-Mills, octonionic instantons and triholomorphic curves
In four-dimensional gauge theory there exists a well-known correspondence
between instantons and holomorphic curves, and a similar correspondence exists
between certain octonionic instantons and triholomorphic curves. We prove that
this latter correspondence stems from the dynamics of various dimensional
reductions of ten-dimensional supersymmetric Yang-Mills theory. More precisely
we show that the dimensional reduction of the (5+1)-dimensional supersymmetric
sigma model with hyperkaehler (but otherwise arbitrary) target X to a
four-dimensional hyperkaehler manifold M is a topological sigma model
localising on the space of triholomorphic maps M -> X (or hyperinstantons).
When X is the moduli space M_K of instantons on a four-dimensional hyperkaehler
manifold K, this theory has an interpretation in terms of supersymmetric gauge
theory. In this case, the topological sigma model can be understood as an
adiabatic limit of the dimensional reduction of ten-dimensional supersymmetric
Yang-Mills on the eight-dimensional manifold M x K of holonomy Sp(1) x Sp(1) in
Spin(7), which is a cohomological theory localising on the moduli space of
octonionic instantons.Comment: 26 pages, LaTeX2e (A comment and a corresponding acknowledgement
added and a reference ammended
GaHV-2 ICP22 protein is expressed from a bicistronic transcript regulated by three GaHV-2 microRNAs
International audienceHerpesviruses have a lifecycle consisting of successive lytic, latent and reactivation phases. Only three infected cell proteins (ICPs) have been described for the oncogenic Marek's disease virus (or Gallid herpes virus 2, GaHV-2): ICP4, ICP22 and ICP27. We focus here on ICP22, confirming its cytoplasmic location and showing that ICP22 is expressed during productive phases of the lifecycle, via a bicistronic transcript encompassing the US10 gene. We also identified the unique promoter controlling ICP22 expression, and its core promoter, containing functional responsive elements including E-box, ETS-1 and GATA elements involved in ICP22 transactivation. ICP22 gene expression was weakly regulated by DNA methylation and activated by ICP4 or ICP27 proteins. We also investigated the function of GaHV-2 ICP22. We found that this protein repressed transcription from its own promoter and from those of IE ICP4 and ICP27, and the late gK promoter. Finally, we investigated posttranscriptional ICP22 regulation by GaHV-2 microRNAs. We found that mdv1-miR-M5-3p and -M1-5p downregulated ICP22 mRNA expression during latency, whereas, unexpectedly, mdv1-miR-M4-5p upregulated the expression of the protein ICP22, indicating a tight regulation of ICP22 expression by microRNAs
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Benchmark enclosure fire suppression experiments - phase 1 test report.
A series of fire benchmark water suppression tests were performed that may provide guidance for dispersal systems for the protection of high value assets. The test results provide boundary and temporal data necessary for water spray suppression model development and validation. A review of fire suppression in presented for both gaseous suppression and water mist fire suppression. The experimental setup and procedure for gathering water suppression performance data are shown. Characteristics of the nozzles used in the testing are presented. Results of the experiments are discussed
An algebraic Birkhoff decomposition for the continuous renormalization group
This paper aims at presenting the first steps towards a formulation of the
Exact Renormalization Group Equation in the Hopf algebra setting of Connes and
Kreimer. It mostly deals with some algebraic preliminaries allowing to
formulate perturbative renormalization within the theory of differential
equations. The relation between renormalization, formulated as a change of
boundary condition for a differential equation, and an algebraic Birkhoff
decomposition for rooted trees is explicited
El contagio de el Peñón que acredita los famosos Tropheos de la Facultad Médica : individual descripción de la constitución pestilente que padeció aquella Plaza en el año 1743
Edición facsímil de la publicación original impresa en Málaga, en 1744 por Thomas Exarch, Juan de Figueroa y Joseph Serrano
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