762 research outputs found
Duality and Non-Commutative Gauge Theory
We study the generalization of S-duality to non-commutative gauge theories.
For rank one theories, we obtain the leading terms of the dual theory by
Legendre transforming the Lagrangian of the non-commutative theory expressed in
terms of a commutative gauge field. The dual description is weakly coupled when
the original theory is strongly coupled if we appropriately scale the
non-commutativity parameter. However, the dual theory appears to be
non-commutative in space-time when the original theory is non-commutative in
space. This suggests that locality in time for non-commutative theories is an
artifact of perturbation theory.Comment: 7 pages, harvmac; a typo fixe
Opini Mahasiswa terhadap Pelaksanaan Kuliah Kerja Nyata (Kukerta) di Universitas Riau
Field Work Experience (Kukerta) is intrakurikuler program with the main objective to provide education to students. The students of Field Work Experience (Kukerta) as a study conducted in the midst of the scientific community to implement possessed by every student of various disciplines, can then be applied in the middle of society. One of the institutions that implement activities Field Work Experience (Kukerta) is the University of Riau. The results showed that the students opinions is different, some refuse and support the implementation of Kukerta. The students opinions have mutual balance between supporting and rejecting.Key word : Communication, Opinion, Field Work Experience (Kukerta
Late-Stage Molecular Editing Enabled by Ketone Chain-Walking Isomerization
Herein, a method for the isomerization of ketones in a manner akin to the chain-walking reaction of alkenes is described. Widely available and inexpensive pyrrolidine and elemental sulfur are deployed as catalysts to achieve this reversible transformation. Key to the utility of this approach was the elucidation of a stereochemical model to determine the thermodynamically favored product of the reaction and the kinetic selectivity observed. With the distinct selectivity profile of our ketone chain-walking process, the isomerization of various steroids was demonstrated to rapidly access novel steroids with "unnatural" oxidation patterns.ISSN:0002-7863ISSN:1520-512
Condensation in Temporally Correlated Zero-Range Dynamics
Condensation phenomena in non-equilibrium systems have been modeled by the
zero-range process, which is a model of particles hopping between boxes with
Markovian dynamics. In many cases, memory effects in the dynamics cannot be
neglected. In an attempt to understand the possible impact of temporal
correlations on the condensate, we introduce and study a process with
non-Markovian zero-range dynamics. We find that memory effects have significant
impact on the condensation scenario. Specifically, two main results are found:
(1) In mean-field dynamics, the steady state corresponds to that of a Markovian
ZRP, but with modified hopping rates which can affect condensation, and (2) for
nearest-neighbor hopping in one dimension, the condensate occupies two adjacent
sites on the lattice and drifts with a finite velocity. The validity of these
results in a more general context is discussed.Comment: 4 pages, 3 figure
Disentangling genetic and environmental effects on the proteotypes of individuals
Proteotypes, like genotypes, have been found to vary between individuals in several studies, but consistent molecular functional traits across studies remain to be quantified. In a meta-analysis of 11 proteomics datasets from humans and mice, we use co-variation of proteins in known functional modules across datasets and individuals to obtain a consensus landscape of proteotype variation. We find that individuals differ considerably in both protein complex abundances and stoichiometry. We disentangle genetic and environmental factors impacting these metrics, with genetic sex and specific diets together explaining 13.5% and 11.6% of the observed variation of complex abundance and stoichiometry, respectively. Sex-specific differences, for example, include various proteins and complexes, where the respective genes are not located on sex-specific chromosomes. Diet-specific differences, added to the individual genetic backgrounds, might become a starting point for personalized proteotype modulation toward desired features
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