2,030 research outputs found
AD results Swarm B, <i>red: CE</i>, black: Fuzzy, <i>blue: D-SAX</i>, green: SAX.
No full textAD results Swarm B, red: CE, black: Fuzzy, blue: D-SAX, green: SAX.</p
The complete worldsheet S matrix of superstrings on AdS3×S3×T4 with mixed three-form flux
No full textWe determine the off-shell symmetry algebra and representations of Type IIB superstring theory on AdS3×S3×T4 with mixed R-R and NS-NS three-form flux. We use these to derive the non-perturbative worldsheet S matrix of fundamental excitations of the superstring theory. Our analysis includes both massive and massless modes and shows how turning on mixed three-form flux results in an integrable deformation of the S matrix of the pure R-R theory
Integrability and the conformal field theory of the Higgs branch
No full textIn the context of the AdS3/CFT2 correspondence, we investigate the Higgs branch CFT2. Witten showed that states localised near the small instanton singularity can be described in terms of vector multiplet variables. This theory has a planar, weak-coupling limit, in which anomalous dimensions of single-trace composite operators can be calculated. At one loop, the calculation reduces to finding the spectrum of a spin-chain with nearest-neighbour interactions. This CFT2 spin-chain matches precisely the one that was previously found as the weak-coupling limit of the integrable system describing the AdS3 side of the duality. We compute the one-loop dilatation operator in a non-trivial compact subsector and show that it corresponds to an integrable spin-chain Hamiltonian. This provides the first direct evidence of integrability on the CFT2 side of the correspondence
The AdS 3 × S 3 × S 3 × S 1 worldsheet S matrix
No full textWe investigate type IIB strings on AdS 3 × S 3 × S 3 × S 1 with mixed Ramond–Ramond and Neveu–Schwarz–Neveu–Schwarz flux. By suitably gauge-fixing the closed string Green–Schwarz action of this theory, we derive the off-shell symmetry algebra and its representations. We use these to determine the non-perturbative worldsheet S matrix of fundamental excitations in the theory. The analysis involves both massive and massless modes in complete generality. The S matrix we find involves a number of phase factors, which in turn satisfy crossing equations that we also determine. We comment on the nature of the heaviest modes of the theory, but leave their identification either as composites or bound-states to a future investigation
Towards the All-Loop Worldsheet S Matrix for AdS3 × S3 × T4
No full textWe obtain the all-loop worldsheet S matrix for fundamental excitations on AdS3 × S3 × T4 by studying the off-shell symmetry algebra of the superspace action in light cone gauge. The massless modes, unaccounted for in earlier works, are automatically included in our treatment. Their exact dispersion relation is found to be nonrelativistic, of giant-magnon form, and their scattering is naturally well defined. This opens the way to a complete investigation of AdS3/CFT2 integrability
Histoire de l'arbitrage international permanent / par B. Sax
No full textAppartient à l’ensemble documentaire : MAEDIGen0Appartient à l’ensemble documentaire : MAEDI006Appartient à l’ensemble documentaire : MAEDI010Appartient à l’ensemble documentaire : MAEDI012Appartient à l’ensemble documentaire : MAEDI011Avec mode text
Divergent evolution of (betaalpha)8-barrel enzymes.
No full textThe (betaalpha)8-barrel is the most versatile and most frequently encountered fold among enzymes. It is an interesting question how the contemporary (betaalpha)8-barrels are evolutionarily related and by which mechanisms they evolved from more simple precursors. Comprehensive comparisons of amino acid sequences and three-dimensional structures suggest that a large fraction of the known (betaalpha)8-barrels have divergently evolved from a common ancestor. The mutational interconversion of enzymatic activities of several (betaalpha)8-barrels further supports their common evolutionary origin. Moreover, the high structural similarity between the N- and C-terminal (betaalpha)4 units of two (betaalpha)8-barrel enzymes from histidine biosynthesis indicates that the contemporary proteins evolved by tandem duplication and fusion of the gene of an ancestral 'half-barrel' precursor. In support of this hypothesis, recombinantly produced 'half-barrels' were shown to be folded, dimeric proteins
Localization of SAX-3::GFP in PDE neuron.
No full text<p>(A) Quantitation of the abnormal SAX-3::GFP distribution in some mutants. Any SAX-3::GFP distribution that is different from (B) is regarded as abnormal. Asterisks denote statistically significant difference between the wild-type worms and the mutants. **P<0.01, *P<0.05. (B) In wild-type animals, SAX-3::GFP distributed mainly on cell membrane and axons, and was also evenly expressed in the cytoplasm. Scale bar: 5 µm. (C) <i>unc-51(e1189)</i> mutants showed altered SAX-3::GFP distribution in cytoplasm (with aggregates in cell body). Arrow: SAX-3::GFP aggregation. Scale bar: 5 µm. (D) SAX-3::GFP aggregates in the PDE cell body of the <i>unc-51</i> RNAi worm. Arrow: SAX-3::GFP aggregation. Scale bar: 5 µm. ***P<0.001. <i>ngEx</i>31(P<i>dat-1</i>::SAX-3::GFP) or <i>ngIs15</i>(P<i>dat-1</i>::SAX-3::GFP) was crossed to the mutants to examine the membrane localization of SAX-3::GFP. RNAi experiment was performed on <i>rrf-3(pk1426);ngIs15</i>(P<i>dat-1</i>::SAX-3::GFP) worms. Error bars represent standard errors.</p
SYD-1 function requires SAX-3.
No full text<p>(A) The <i>syd-1(ju2)</i> null mutation does not enhance guidance defects in <i>sax-3(ky123)</i> null mutants. (B) The <i>syd-1(ju2)</i> null mutation enhances guidance defects in <i>sax-3(ky200)</i> hypomorphic mutants. For experiments with the <i>sax-3(ky123)</i> null mutants, we scored only severe HSN defects (the axon never reaches the ventral nerve cord). For the <i>sax-3(ky200)</i> hypomorphic mutants, we did not observe any severe HSN axon guidance defects, but only mild defects (the axon trajectory is defective but eventually reaches the ventral nerve cord). Therefore, for experiments with the <i>sax-3(ky200)</i> hypomorphic mutants, we scored mild axon guidance defects. For all experiments, n≥200. Bracket indicates statistically significant difference, Z test for proportions (*p<0.01).</p
A renewed demand for the expertise of EL teachers for all learners
No full text1 online resource (PDF: 2 pages). 2013 Harold B. Allen Award Winner.Mabbott, Ann Sax. (2014). A renewed demand for the expertise of EL teachers for all learners. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/176675
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