1-dimensinal dimer adsorption model
n= average total number of heads per lattice site
n_1= average number of dimers bound with one head
n_d= average number dimers bound with both heads
heads per lattice site 
Parameters
All reaction rates are given in inverse seconds
- k1+ c Association rate for the first head
 - k2+b Association rate for the second head at the left 
of the first one
 - k2+f Association rate for the second head at the right 
of the first one
 - k2-b Dissociation rate for the left head of a double-bonded dimer
 - k2-f Dissociation rate for the right head of a double-bonded dimer
 - k1- Dissociation rate for a single-bonded dimer
 
Dimensionless ratios:
K1=k1+/k1-
K2=k2+f/k2-f=k2+b/k2-b
Predefined parameter sets
Three parameter sets showing interesting cases can be retrieved through
buttons at the bottom.  These include:
-  Irreversible decoration: No dissociation, binding
of the second head on both sides much faster than the binding first
one.
 -  Explicit diffusion: K1=0.1, K2=1000, symmetric association of the second head
 -  No explicit diffusion: K1=0.1, K2=1000, association of the second head only to one side
 
(C) Andrej Vilfan, Aug. 1999