353 research outputs found
Bosonization in Higher Dimensions
Using the recently discovered connection between bosonization and duality
transformations (hep-th/9401105 and hep-th/9403173), we give an explicit
path-integral representation for the bosonization of a massive fermion coupled
to a U(1) gauge potential (such as electromagnetism) in d space (D=d+1
spacetime) dimensions. The bosonic theory is described by a rank d-1
antisymmetric Kalb-Ramond-type gauge potential. We construct the bosonized
lagrangian explicitly in the limit of large fermion mass. We find that the
resulting action is local for d=2 (and given by a Chern-Simons action), but
nonlocal for d larger than 3. By coupling to a statistical Chern-Simons field
for d=2, we obtain a bosonized formulation of anyons. The bosonic theory may be
further dualized to a theory involving purely scalars, for any d, and we show
this to be governed by a higher-derivative lagrangian for which the scalar
decouples from the U(1) gauge potential.Comment: (We had omitted some references and had misspelled `aficionados')
plain TeX, 11 pages, McGill-94/33, NEIP-94-006, OSLO-TP 10-9
Evaluation of the anticorrosive properties of environmental friendly inorganic corrosion inhibitors pigments
Bosonization and Duality in Arbitrary Dimensions: New Results
A generic massive Thirring Model in three space-time dimensions exhibits a
correspondence with a topologically massive bosonized gauge action associated
to a self-duality constraint, and we write down a general expression for this
relationship.
We also generalize this structure to dimensions, by adopting the
so-called doublet approach, recently introduced. In particular, a non-
conventional formulation of the bosonization technique in higher dimensions (in
the spirit of ), is proposed and, as an application, we show how fermionic
(Thirring-like) representations for bosonic topologically massive models in
four dimensions may be built up.Comment: Revised version, to appear in Phys. Rev.
Analysis Of The Ergosterol Biosynthesis Pathway Cloning, Molecular Characterization And Phylogeny Of Lanosterol 14 α-demethylase (erg11) Gene Of Moniliophthora Perniciosa
The phytopathogenic fungus Moniliophthora perniciosa (Stahel) Aime & Philips-Mora, causal agent of witches’ broom disease of cocoa, causes countless damage to cocoa production in Brazil. Molecular studies have attempted to identify genes that play important roles in fungal survival and virulence. In this study, sequences deposited in the M. perniciosa Genome Sequencing Project database were analyzed to identify potential biological targets. For the first time, the ergosterol biosynthetic pathway in M. perniciosa was studied and the lanosterol 14α-demethylase gene (ERG11) that encodes the main enzyme of this pathway and is a target for fungicides was cloned, characterized molecularly and its phylogeny analyzed.ERG11 genomic DNA and cDNA were characterized and sequence analysis of the ERG11 protein identified highly conserved domains typical of this enzyme, such as SRS1, SRS4, EXXR and the heme-binding region (HBR). Comparison of the protein sequences and phylogenetic analysis revealed that the M. perniciosa enzyme was most closely related to that of Coprinopsis cinerea.374683693Aime, M.C., Phillips-Mora, W., The causal agents of witches’ broom and frost pod rot of cacao (chocolate, Theobroma cacao) from a new lineage of Marasmiaceae (2005) Mycologia, 97, pp. 1012-1022Albertini, C., Thebaud, G., Fournier, E., Leroux, P., Eburicol 14α-demethylase gene (CYP51) polymorphism and speciation in Botrytis cinerea (2002) Mycol Res, 106, pp. 1171-1178Altschul, S.F., Gish, W., Miller, W., Myersewand Lipman, D.J., Basic local alignment search tool (1990) J Mol Biol, 215, pp. 403-410Bak, S., Kahn, R.A., Oisen, C.E., Halkier, B.A., Cloning and expression in Escherichia coli of the obtusifoliol 14α-demethylase of Sorghum bicolor (L.) 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237: Long term results of allogeneic stem cell transplant for CML in pediatric patients A study of 50 cases transplanted over 20 years in a single institution
Sistema de visão por infravermelho próximo para monitoramento de processos de soldagem a arco
Condensed matter and AdS/CFT
I review two classes of strong coupling problems in condensed matter physics,
and describe insights gained by application of the AdS/CFT correspondence. The
first class concerns non-zero temperature dynamics and transport in the
vicinity of quantum critical points described by relativistic field theories. I
describe how relativistic structures arise in models of physical interest,
present results for their quantum critical crossover functions and
magneto-thermoelectric hydrodynamics. The second class concerns symmetry
breaking transitions of two-dimensional systems in the presence of gapless
electronic excitations at isolated points or along lines (i.e. Fermi surfaces)
in the Brillouin zone. I describe the scaling structure of a recent theory of
the Ising-nematic transition in metals, and discuss its possible connection to
theories of Fermi surfaces obtained from simple AdS duals.Comment: 39 pages, 12 figures; Lectures at the 5th Aegean summer school, "From
gravity to thermal gauge theories: the AdS/CFT correspondence", and the De
Sitter Lecture Series in Theoretical Physics 2009, University of Groninge
Hypotensive effect and endothelium-dependent vascular action of leaves of Alpinia purpurata (Vieill) K. Schum
The aims of this study were to evaluate the chemical profile, vascular reactivity, and acute hypotensive effect (AHE) of the ethanolic extract of leaves of Alpinia purpurata (Vieill) K. Schum (EEAP). Its chemical profile was evaluated using HPLC-UV, ICP-OES, and colorimetric quantification of total flavonoids and polyphenols. The vascular reactivity of the extract was determined using the mesenteric bed isolated from WKY. AHE dose-response curves were obtained for both EEAP and inorganic material isolated from AP (IAP) in WKY and SHR animals. Cytotoxic and mutagenic safety levels were determined by the micronucleus test. Rutin-like flavonoids were quantified in the EEAP (1.8 ± 0.03%), and the total flavonoid and polyphenol ratios were 4.1 ± 1.8% and 5.1 ± 0.3%, respectively. We observed that the vasodilation action of EEAP was partially mediated by nitric oxide (·NO). The IAP showed the presence of calcium (137.76 ± 4.08 μg mg-1). The EEAP and IAP showed an AHE in WKY and SHR animals. EEAP did not have cytotoxic effects or cause chromosomic alterations. The AHE shown by EEAP could result from its endothelium-dependent vascular action. Rutin-like flavonoids, among other polyphenols, could contribute to these biological activities, and the calcium present in EEAP could act in a synergistic way
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