"Wcsjohn" > wrote in message =
...

> ... I have spent much time Googling with the string "emil hansen"=20
> techniques yeast "serial dilution" and many variations, adding
> in "laboratory" "microbiology" and "beer".

Google "streak-plate". You may find, for instance,
http://www.austin.cc.tx.us/microbugz/18streakiso.html

Another such technique is "pour-plate". That is consistent
with "serial dilution" but is more appropriate to counting
microorganisms than to isolating single colonies.

Those techniques are appropriate to microbiological labs,
but hardly to kitchens.

"Wcsjohn" > wrote in message =
...

> ... a little off-topic ...

Bread and beer can be made with very little knowledge of=20
microbiology. But posters to this thread may be interested in
http://aem.asm.org/cgi/content/full/64/7/2616
and the references given there.

Be sure you understand all that before you attempt to bake
another loaf of bread.