Astros Minor League Roster Moves/Transactions

There have been a few roster moves from the last couple of days that I haven't had a chance to report yet so here goes:

OKLAHOMA CITY
6/19 - LHP Patrick Urckfitz assigned from Corpus Christi to Oklahoma City
6/21 - RHP Jake Buchanan added to the 40-man roster and called up to Houston (RHP Jose Cisnero moved to the 60-day DL to make room for him)
6/21 - RHP Paul Clemens optioned to Oklahoma City

CORPUS CHRISTI
6/19 - LHP Mitch Lambson assigned from Lancaster to Corpus Christi

LANCASTER
6/19 - 1B Brandon Meredith activated from the DL

GREENEVILLE
6/20 - RHP Brock Dykxhoorn assigned to Greeneville (the 6th rounder tweeted out earlier today that he had signed)
6/20 - RHP Robert Kahana assigned to Greeneville (32nd rounder who has presumably signed)

Here is the updated draft listing with all the signings I know about.