[BioRuby] Residue contacts

[Fredrik Johansson]

Hello,
I have seen from the documentation that BioRuby makes it possible to
check distances between atoms in a Bio::PDB object. My question then
is : is it also possible to do this on the residue level (distance
defined in some way)? 

Ultimately I want to find all residues found within a specified distance
of a specified residue (i.e. which residues are in contact), so if
BioRuby has THAT method I would be very happy.

Thanks for any answer!

Fredrik