OBJECTIVE To compare the prevalence of an incomplete circle of Willis in patients with migraine with aura, migraine without aura, and control subjects, and correlate circle of Willis variations with alterations in cerebral perfusion. METHODS Migraine with aura, migraine without aura, and control subjects were prospectively enrolled in a 1∶1∶1 ratio. Magnetic resonance angiography was performe...

Language and culture are now deemed to be co-constitutive; hence English language teaching (ELT) textbooks should incorporate cultural aspects and promote intercultural competence. However, careful decisions should be made as regards to the cultural content of materials and the ways in which culture is represented. This study was an attempt to deconstruct the patterns of cultural representation...

Circle packings (and more generally patterns) as discrete analogs of conformal mappings is a fast developing field of research on the border of analysis and geometry. Recent progress was initiated by Thurston’s idea [T] about the approximation of the Riemann mapping by circle packings. The corresponding convergence was proven by Rodin and Sullivan [RS]; many additional connections with analytic...

Circular-arc graphs are the intersection graphs of open arcs on a circle. Circle graphs are the intersection graphs of chords on a circle. These graph classes have been the subject of much study for many years and numerous interesting results have been reported. Many subclasses of both circular-arc graphs and circle graphs have been defined and different characterizations formulated. In this su...

BACKGROUND Previous studies have proposed correlation between variants of the cerebral arterial circle (also known as circle of Willis) and some cerebrovascular diseases. Differences in the incidence of these diseases in different populations have also been investigated. The study of variations in the anatomy of the cerebral arterial circle may partially explain differences in the incidence of ...

OBJECTIVE To explore the impact of quality circles on job satisfaction, absenteeism, and turnover among hospital nurses in Taiwan. DESIGN A quasi-experimental research design. SETTING In November 1995, a study was initiated to establish quality circles in a 500-bed community hospital in Taiwan. After the administrative process and a pilot study, three of the experimental units began impleme...

Circle graphs are intersection graphs of chords in a circle and kpolygon graphs are the intersection graphs of chords in a convex ksided polygon where each chord has its endpoints on distinct sides. Every k-polygon graph is a circle graph and every circle graph is a kpolygon graph for some k. The polygon number ψ(G) of a circle graph G is the minimum k such that G is a k-polygon graph and the p...

To a rhombic embedding of a planar graph with quadrilateral faces and vertices colored black and white there is an associated isoradial circle pattern C 1 with centers of circles at white vertices and radii equal to the edge length. Let C 2 be another circle pattern such that the rhombi correspond to kites of intersecting circles with the same intersection angles. We consider the mapping g C wh...

conclusions species identification of trichophyton is crucially important for epidemiological and phylogenetic purposes and for genotype delineation. rca based on its polymorphisms can be used to generate identification barcodes and as an alternative to dna sequencing; it is a very fast, specific, and economical tool for species identification. results of the 61 putative trichophyton clinical i...

Objectives: To examine the influence of enhanced expectancies on motor learning, we manipulated learners' expectancies by providing criteria for “success” that were relatively easy or difficult to meet. Design: Experimental design with two groups. Method: Two groups of non-golfers practiced putting golf balls to a target from a distance of 150 cm. The target was surrounded by a large (14 cm dia...