Topics in Noncommutative Geometry Inspired Physics

In this review article we discuss some of the applications of noncommutative geometry in physics that are of recent interest, such as noncommutative many-body systems, noncommutative extension of Special Theory of Relativity kinematics, twisted gauge theories and noncommutative gravity.Comment: New references added, Published online in Foundations of Physic

Chronic meningococcemia presenting with recurrent painful rash and poly-arthralgia without fever

Chronic meningococcemia is an uncommon disorder, representing a diagnostic challenge. Classically, this pathology would be considered in young adults with a history of episodes of fever, disseminated cutaneous vasculitis and arthralgia. Exact and rapid diagnosis is often further challenged by the fact that routine microbiological investigations frequently failed to identify incriminated micro-organism, Neisseria meningitidis. Here we present the case of a young man not presenting with the classical triad.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Rigid Orthogonal Bis-TEMPO Biradicals with Improved Solubility for Dynamic Nuclear Polarization

The synthesis and characterization of oxidized bis-thioketal-trispiro dinitroxide biradicals that orient the nitroxides in a rigid, approximately orthogonal geometry are reported. The biradicals show better performance as polarizing agents in dynamic nuclear polarization (DNP) NMR experiments as compared to biradicals lacking the constrained geometry. In addition, the biradicals display improved solubility in aqueous media due to the presence of polar sulfoxides. The results suggest that the orientation of the radicals is not dramatically affected by the oxidation state of the sulfur atoms in the biradical, and we conclude that a biradical polarizing agent containing a mixture of oxidation states can be used for improved solubility without a loss in performance.National Institutes of Health (U.S.) (grant EB002804)National Institutes of Health (U.S.) (grant EB002026)National Institutes of Health (U.S.) (grant GM095843)European Commission (Design Study project Bio-DNP)Deutsche Forschungsgemeinschaft (postdoctoral fellowship