The following is a case of Charles Bonnet syndrome in an 86-year-old woman who presented with visual hallucinations. The differential diagnosis of visual hallucinations is broad and emergency physicians should be knowledgeable of the possible etiologies.

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Charles Weissmann’s new office, squeezed into the corner of a London laboratory, seems in every sense too small for him. An imposing physical presence, his intellect also dominates the space with the kind of energy that can scarcely veil its impatience. Weissmann, best known today for his contributions to the molecular biology of prion diseases such as scrapie and BSE, came to work at Imperial ...

In 1868 in England, Charles Darwin [5] proposed his pangenesis [6] theory to describe the units of inheritance between parents and offspring and the processes by which those units control development in offspring. Darwin coined the concept of gemmules, which he said referred to hypothesized minute particles of inheritance thrown off by all cells of the body. The theory suggested that an organis...

Kevin A. Wepasnick , Billy A. Smith , Kaitlin E. Schrote , Hannah K. Wilson , Stephen R. Diegelmann , D. Howard Fairbrother a,d,e,* a Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, United States b Department of Chemistry, College of Notre Dame of Maryland, 4701 North Charles Street, Baltimore, MD 21210, United States c Department of Chemical a...

1 Department of Clinical Biochemistry and Pathobiochemistry, Charles University 2 Medical School and University Hospital Motol, Prague. 2 Institute of Microbiology, v.v.i. Academy of Sciences of the Czech Republic, Vídeňská 1083, 142 20 Prague. 3 Department of Forensic Medicine and Toxicology, Charles University 1 Medical School , Prague. 4 Neurosurgery Department, Charles University 3 Medical ...

When G is a rooted graph where each edge may independently succeed with probability p, we consider the expected number of vertices in the operational component of G containing the root. This expected value EV (G;p) is a polynomial in p. We present several distinct equivalent formulations of EV (G;p), unifying prior treatments of this topic. We use results on network resilience (introduced by Co...

Edge-intersection graphs of paths in grids are graphs that can be represented with vertices as paths in grids and edges between the vertices of the graph exist whenever two grid paths share a grid edge. This type of graphs is motivated by applications in conflict resolution of paths in grid networks. In this paper, we continue the study of edge-intersection graphs of paths in a grid, which was ...

We show that evaluating the Tutte polynomial for the class of bicircular matroids is #Phard at every point (x, y) except those in the hyperbola (x − 1)(y − 1) = 1 and possibly those on the lines x = 0 and x = −1. Since bicircular matroids form a rather restricted subclass of transversal matroids, our results can be seen as a partial strengthening of a result by Colbourn, Provan and Vertigan, na...

The minimum number of rows in covering arrays (equivalently, surjective codes) and radius-covering arrays (equivalently, surjective codes with a radius) has been determined precisely only in special cases. In this paper, explicit constructions for numerous best known covering arrays (upper bounds) are found by a combination of combinatorial and computational methods. For radius-covering arrays,...