PAM used in the research was from Daqing for oil production.
The polymer had a molecular weight of 1.6×107.
Two different liquid media were used for the isolation. One was
mineral salts medium (MSM) supplemented with 200mgL−1 of
yeast extract and 100mgL−1 of PAM (MSMYP). The other wasMSM
supplemented with 60mgL−1 of PAM as the sole carbon source
(MSMP).