901 research outputs found
Mini-walls for Bridgeland stability conditions on the derived category of sheaves over surfaces
For the derived category of bounded complexes of sheaves on a smooth
projective surface, Bridgeland and Arcara-Bertram constructed Bridgeland
stability conditions parametrized by . In this paper, we show that the set of mini-walls in
of a fixed numerical type is locally finite. In addition, we strengthen a
result of Bayer by proving that the moduli of polynomial Bridgeland semistable
objects of a fixed numerical type coincides with the moduli of -semistable objects whenever is larger than a universal constant
depending only on the numerical type. We further identify the moduli of
polynomial Bridgeland semistable objects with the Gieseker/Simpson moduli
spaces and the Uhlenbeck compactification spaces.Comment: 26 page
On blowup formulae for the S-duality conjecture of Vafa and Witten
This is the first part of two papers. In this part, we prove the blowup
formulae for virtual Hodge polynomials of Gieseker moduli spaces of rank-2
stable sheaves and Uhlenbeck compactification spaces over algebraic surfaces.
In particular, we verify the blowup formulae for the S-duality conjecture of
Vafa-Witten, i.e. the blowup formulae for the Euler numbers of instanton moduli
spaces over algebraic surfaces.Comment: 24 page
Detecting peroxiredoxin hyperoxidation by one-dimensional isoelectric focusing
The activity of typical 2-cys peroxiredoxin (Prxs) can be regulated by hyperoxidation with a consequent loss of redox activity. Here we developed a simple assay to monitor the level of hyperoxidation of different typical 2-cys prxs simultaneously. This assay only requires standard equipment and can compare different samples on the same gel. It requires much less time than conventional 2D gels and gives more information than Western blotting with an antibody specific for hyperoxidized peroxiredoxin. This method could also be used to monitor protein modification with a charge difference such as phosphorylation
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