We examine the T-duality relation between 1 + 1 NCOS and the DLCQ limit of type IIA string theory. We show that, as long as there is a compact dimension, one can meaningfully define an ‘NCOS’ limit of IIB/A string theory even in the absence of D-branes (and even if there is no B-field). This yields a theory of closed strings with strictly positive winding, which is T-dual to DLCQ IIA/B without ...

We study decoupling limits and S-dualities for noncommutative open string/ Yang-Mills theory in a gravity setup by considering an SL(2, Z) invariant super-gravity solutions of the form ((F, D1), D3) bound state of type IIB string theory. This configuration can be regarded as D3-brane solution with both electric and magnetic fields turned on along one of the spatial directions of the brane and p...

Recombination plays a fundamental role in meiosis. Non-exchange gene conversion (non-crossover, NCO) may facilitate homologue pairing, while reciprocal crossover (CO) physically connects homologues so they orientate appropriately on the meiotic spindle. In males, X-Y homologous pairing and exchange occurs within the two pseudoautosomal regions (PARs) together comprising <5% of the human sex chr...

Recently it was shown that NCOS theories are part of a ten-dimensional theory known as Non-relativistic Wound string theory. We clarify the sense in which gravity is present in this theory. We show that Wound string theory contains exceptional unwound strings, including a graviton, which mediate the previously discovered instantaneous long-range interactions, but are negligible as asymptotic st...

Meiotic DNA double-strand breaks (DSBs) initiate crossover (CO) recombination, which is necessary for accurate chromosome segregation, but DSBs may also repair as non-crossovers (NCOs). Multiple recombination pathways with specific intermediates are expected to lead to COs and NCOs. We revisited the mechanisms of meiotic DSB repair and the regulation of CO formation, by conducting a genome-wide...

Accurate segregation of homologous chromosomes of different parental origin (homologs) during the first division of meiosis (meiosis I) requires inter-homolog crossovers (COs). These are produced at the end of meiosis I prophase, when recombination intermediates that contain Holliday junctions (joint molecules, JMs) are resolved, predominantly as COs. JM resolution during the mitotic cell cycle...

We examine magnetic and electric near horizon regions of maximally supersymmetric Dbrane and NS5-brane bound states and find transformations between near horizon regions with worldvolume dual magnetic and electric fluxes. These point to dual formulations of NCYM, NCOS and ODp theories in the limit of weak coupling and large spatial or temporal noncommutativity length scale in terms of weakly co...

The dual supergravity description of the flow between (2,0) five–brane theory and the noncommutative five–brane (OM) theory is examined at critical five– brane field strength. The self–duality of the field strength is shown to arise as a consequence of the supergravity solution. Open membrane solutions are examined in the background of the five–brane giving rise to an M analogue of the noncommu...

The dual supergravity description of the flow between (2,0) five–brane theory and the noncommutative five–brane (OM) theory is examined at critical five– brane field strength. The self–duality of the field strength is shown to arise as a consequence of the supergravity solution. Open membrane solutions are examined in the background of the five–brane giving rise to an M analogue of the noncommu...