The program DCDT+ is a Windows implementation of Walter
Stafford's DCDT algorithm integrated with non-linear curve fitting to derive
sedimentation and diffusion coefficients (or molecular mass) for up to
5 components in a mixture, using a user interface similar to that in SVEDBERG.
It comes with context-sensitive Help, tutorials, and "how-to" guides.
A complete program description may be found at http://www.jphilo.mailway.com
The program itself may be downloaded for a 30-day free trial from that
site.