Heterogeneous bacterial swarms with mixed lengths.

Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on its constituents. These considerations are particularly significant for understanding realistic bacterial swarms, which typically develop heterogeneities even when grown from a single cell.

Smoking prevention and primary physician's and patient's characteristics.

Objective: To describe relationships between primary physician and patient characteristics and the approach to prevention and quitting of smoking.

Methods: A questionnaire composed of descriptions of cases and clinic activities was given to primary physicians.

Results: Fewer smoking physicians use written materials, yet former smokers more often recommend smoking cessation groups.