1,834 research outputs found
On -close Sperner systems
For a set of positive integers, a set system is said to be -close Sperner, if for any pair of distinct
sets in the skew distance belongs to . We reprove an extremal result of Boros,
Gurvich, and Milani\v c on the maximum size of -close Sperner set systems
for and generalize to and obtain slightly weaker bounds for
arbitrary . We also consider the problem when might include 0 and
reprove a theorem of Frankl, F\"uredi, and Pach on the size of largest set
systems with all skew distances belonging to
Ubiquitination of tombusvirus p33 replication protein plays a role in virus replication and binding to the host Vps23p ESCRT protein
AbstractPost-translational modifications of viral replication proteins could be widespread phenomena during the replication of plus-stranded RNA viruses. In this article, we identify two lysines in the tombusvirus p33 replication co-factor involved in ubiquitination and show that the same lysines are also important for the p33 to interact with the host Vps23p ESCRT-I factor. We find that the interaction of p33 with Vps23p is also affected by a “late-domain”-like sequence in p33. The combined mutations of the two lysines and the late-domain-like sequences in p33 reduced replication of a replicon RNA of Tomato bushy stunt virus in yeast model host, in plant protoplasts, and plant leaves, suggesting that p33-Vps23p ESCRT protein interaction affects tombusvirus replication. Using ubiquitin-mimicking p33 chimeras, we demonstrate that high level of p33 ubiquitination is inhibitory for TBSV replication. These findings argue that optimal level of p33 ubiquitination plays a regulatory role during tombusvirus infections
The asymptotic geometry of -monopoles
This article investigates the asymptotics of -monopoles. First, we
prove that when the underlying -manifold has polynomial volume growth
strictly faster than , finite intermediate energy monopoles with
bounded curvature have finite mass. The second main result restricts to the
case when the underlying -manifold is asymptotically conical. In this
situation, we deduce sharp decay estimates and that the connection converges,
along the end, to a pseudo-Hermitian--Yang--Mills connection over the
asymptotic cone. Finally, our last result exhibits a Fredholm setup describing
the moduli space of finite intermediate energy monopoles on an asymptotically
conical -manifold.Comment: 80 pages. v2: added 4 new sections, new results, including a third
main result; previous sections fully revised, exposition improved, corrected
typos and reworked some proof
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