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Petri announced in the spring that he would retire after his current term.

It remains the receptive petri dish to any and all sorts of colonies of humanity that finally managed to find one another.

If one or both ran, it would likely help Petri by splitting the conservative vote in a primary.

Observers think Grothman would be well-positioned in a Republican primary, provided the 73-year-old Petri even runs.

Tom Petri is an institution in Wisconsin politics but the 35-year-veteran of Capitol Hill faces a tough path to re-election.

Petri dish or cleaned photographic plates for sputum examination.

These petri dishes, so called after their inventor, are the traps in which we collect and study bacteria.

Place three sterile Petri dishes in a row on the surface of the glass plate and number them 1, 2, and 3, from left to right.

Pour each tube into a separate Petri dish and allow it to solidify.

Transfer each slice of egg by means of a pair of sterilised forceps to a Petri dish or large capsule.

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