Clinical inquiry. Chronic urticaria: what diagnostic evaluation is best?

Chronic urticaria affects 1% of the general population and is usually defined as the presence of hives (with or without angioedema) for at least 6 weeks.¹

The keys to a successful security project.

Poor planning of a security project can result in cost overruns and, sometimes, an unsuccessful project, the authors report. Based on their experience in dealing with vendors, contractors, and management, they present in this article the planning steps that should be taken to insure successful completion of the project from its beginning to its integration.

Redox speciation of copper in rainwater: temporal variability and atmospheric deposition.

Copper speciation was determined in 68 rainwater samples collected in Wilmington, NC, from August 25, 2000, to September 24, 2002. Volume-weighted average concentrations of Cu(total), dissolved Cu(II), and dissolved Cu(I) were 5.3, 3.