We describe a patient with postsurgical anaerobic meningitis due to Peptostreptococcus magnus. In cases of meningitis associated with Peptostreptococcus species reported in the literature, the most common predisposing factors are meningorectal fistulae and head-and-neck surgery. Most patients respond well to appropriate antimicrobial therapy. Surgical intervention may be required in some instan...

The motion of vortices is the only significant source of dissipation in a superconductor, making it a topic of some technological importance. Much of the modern work on vortex dynamics relates to many-vortex interaction effects so it is rather surprising to find that there is still considerable debate about the forces acting on an individual vortex. This debate was sparked by the claim in paper...

Porphyria cutanea tarda (symptomatica) (PCT) is an acquired hepatic porphyria, usually caused, in susceptible people, by liver damage from a high ethanol intake. Clinically, patients have skin fragility, hypertrichosis, photosensitivity and hyperpigmentation, and biochemically there is a high urinary excretion of uroporphyrin, hepatic siderosis, abnormal iron metabolism (Turnbull, Baker, Vernon...

The rapid ID32A kit (bioMérieux Vitek, Inc., Hazelwood, Mo.) was evaluated for its ability to identify Peptostreptococcus species compared with conventional biochemical tests and gas-liquid chromatography (Virginia Polytechnic Institute), the current "gold standard" method. A total of 5 Peptostreptococcus American Type Culture Collection strains and 95 clinical isolates comprising Peptostreptoc...

We investigate the phenomenon of the decay of a supercurrent through homogeneous nucleation of vortex-antivortex pairs in a 2-D like superconductor or superfluid by means of a quantum electrodynamic formulation for the decay of the 2-D vacuum. The case in which both externally-driven current and Magnus force are present is treated exactly, taking the vortex activation energy and its inertial ma...

We here revisit expansion schemes used in nuclear magnetic resonance (NMR) for the calculation of effective Hamiltonians and propagators, namely, Magnus, Floquet, and Fer expansions. While all the expansion schemes are powerful methods there are subtle differences among them. To understand the differences, we performed explicit calculation for heteronuclear dipolar decoupling, cross-polarizatio...

The Magnus series is an infinite series which arises in the study of linear ordinary differential equations. If the series converges, then the matrix exponential of the sum equals the fundamental solution of the differential equation. The question considered in this paper is: When does the series converge? The main result establishes a necessary condition for convergence, which improves on seve...