In the 1980s the class underwent a transition from plywood to fibreglass hulls.

The entire class underwent a technical upgrade in 1988 at the Hunslet-Barclay works in Kilmarnock.

As of September 2009, both classes are undergoing rehabilitation.

This class of peptides undergoes self assembling on a surface and form monolayers just few nanometers thick.

"The middle class has undergone a powerful transformation in the last generation," Professor Warren said in an interview.

It is well known that this class of dynamical systems may undergo very interesting and complex phenomena of nonlinear parametric resonance.

Though the coupe's physical appearance changed little over these years, the class underwent a name change several times.

The class underwent refits during each ship's seventh or eighth year of operation, and again at the fifteenth year (which is ongoing until 2012).

One class of 375 men attended the one-week session last week; a second class of 375 are undergoing training this week.

Each class of product may undergo different types of preclinical research.