freezing C. elegans

[Eugene Leitl]

We're about to culture some C. elegans, specifically to select them
for freeze-tolerance.

What is your oppinion as to which freeze-hardy strain to use best?

Is the following freezing protocol still current?
http://www.dartmouth.edu/artsci/bio/ambros/protocols/MGH_protocols/koelle_prot/X
0006_freezing_worms.html

Is the following bulk culture protocol any good?
http://www.dartmouth.edu/artsci/bio/ambros/protocols/other/liquid_culture.html

TIA,

Eugene Leitl