Containing sprawl is a major preoccupation of many urban planners, who view sprawl as responsible for driving up environmental costs and congestion. Nevertheless, many economists see benefits to sprawl, allowing households access to larger and cheaper properties. This Round Table examines the...

This Test Guideline is designed to assess the toxicity of substances to freshwater aquatic plants of the genus Lemna (duckweed). Exponentially growing plant cultures of the genus Lemna (Lemna gibba and Lemna minor usually) are allowed to grow as monocultures in, at least, five concentrations of...

The Sahara-Sahel has seen recurrent episodes of instability. However, the recent Libyan and Malian crises have intensified the level of violence. These episodes have restructured the geopolitical and geographical dynamics of the region. Cross-border or regional, these contemporary crises require...