Perioperative mortality in coronary artery bypass grafting is usually caused by reduced left ventricular function due to regional myocardial ischemia or infarction. Post-operative graft occlusion is a well-known problem in coronary surgery. A sensitive tool to detect graft occlusion and monitor myocardial function may give the opportunity to reviseâ€¦ (More)

We suggest to endow Mumfordâ€™s GIT quotient scheme with a stack structure, by replacing Proj(âˆ’) of the invariant ring with its stack theoretic analogue. We analyse the stacks resulting in this way from classically studied invariant rings, and in particular for binary forms of low degree. Our viewpoint is that the stack structure carries interesting geometricâ€¦ (More)

Using the Serre construction, we give examples of stable rank 2 vector bundles on principally polarized abelian threefolds (X,Î˜) with Picard number 1. The Chern classes (c1, c2) of these examples realize roughly one half of the classes that are a priori allowed by the Bogomolov inequality and Riemann-Roch (the latter gives a certain divisibility condition).â€¦ (More)