28 research outputs found
Non-abelian T-duality, Ramond Fields and Coset Geometries
We extend previous work on non-abelian T-duality in the presence of Ramond
fluxes to cases in which the duality group acts with isotropy such as in
backgrounds containing coset spaces. In the process we generate new
supergravity solutions related to D-brane configurations and to standard
supergravity compactifications.Comment: 35 pages, Late
Non-Abelian T-duality and consistent truncations in type-II supergravity
For a general class of SO(4) symmetric backgrounds in type II-supergravity,
we show that the action of non-Abelian T-duality can be described via
consistent truncation to seven dimensional theories with seemingly massive
modes. As such, any solution to these theories uplifts to both massive type IIA
and IIB supergravities presenting an invertible map between the two. For
supersymmetric backgrounds, we show that for spinors transforming under SO(4)
the non-Abelian T-duality transformation breaks the original supersymmetry by
half. We use these mappings to generate the non-Abelian T-duals of the
maximally supersymmetric pp-wave, the Lin, Lunin, Maldacena geometries and
spacetimes with Lifshitz symmetry.Comment: 41 pages, references added, published versio
The Genetics and Genomics of Virus Resistance in Maize
Viruses cause significant diseases on maize worldwide. Intensive agronomic practices, changes in vector distribution, and the introduction of vectors and viruses into new areas can result in emerging disease problems. Because deployment of resistant hybrids and cultivars is considered to be both economically viable and environmentally sustainable, genes and quantitative trait loci for most economically important virus diseases have been identified. Examination of multiple studies indicates the importance of regions of maize chromosomes 2, 3, 6, and 10 in virus resistance. An understanding of the molecular basis of virus resistance in maize is beginning to emerge, and two genes conferring resistance to sugarcane mosaic virus, Scmv1 and Scmv2, have been cloned and characterized. Recent studies provide hints of other pathways and genes critical to virus resistance in maize, but further work is required to determine the roles of these in virus susceptibility and resistance. This research will be facilitated by rapidly advancing technologies for functional analysis of genes in maize