The author of this program is Dietmar Tietz (Dietmar.Tietz@uni-giessen.de).
Please contact him for questions or suggestions.

ElphoFit 2.31 is freeware and was developed at the National Institutes of
Health, Bethesda, Maryland, USA.

ElphoFit is scientific computer software for the evaluation of electrophoretic
mobility data based on linear or nonlinear Ferguson plots [log(mobility)
vs. polymer concentration].  The program uses a Newton-Gauss
Marquardt-Levenberg curve-fitting algorithm and a mathematical
approach based on the "random space walk of a particle through a fiber
network" (extended Ogston model).  The program allows one to
estimate particle- as well a polymer-specific parameters.  Output is in
the format of tables (including statistical parameters) and graphics.  The
program package provides samples of data, log and pict files as well as a
Read-me Introduction with references to published articles which
explain the underlying rationales and the operation of the program in
great detail.  All references are available upon request from the
program author.

ElphoFit 2.31 has been used in application to proteins, small
and large DNA, viruses, conjugated vaccines and polystyrene particles
(used as size standards).  Mobility data originating from ordinary,
capillary and Serwer-type 2-D agarose electrophoresis have been
evaluated.