However, since no experiments were carried out using the same inocula as experiment 2, together with a low glucose concentration, the value of μmax for experiment 2 is not known.
Also, the features of the environment used in the E. coli long-term experiment (including fairly low glucose concentration and the absence of physical structure) were chosen, in part, to minimize this potential complication, in order to focus on the most fundamental dynamics of evolution.
She conducted an experiments with high glucose, low glucose, high glucose with IL 1, and low glucose with IL 1, measuring the release of glycoaminoglycan (GAG), a sugar-like molecule, released from the (IL-1) protein.
Because iNOS expression was present already in directly isolated GK islets next experiments were conducted at low glucose to avoid interference with in vitro glucose-induced iNOS stimulation [7].
In our study, the only environment in which the mutations are demonstrably beneficial is that of the original evolution experiment (high temperature and low glucose).
The decrease in phosphorylation relative to total Adr1 in low glucose was less than two-fold (average of two experiments, standard deviation of 0.4), so SNF1 was required for the full decrease in serine 98 phosphorylation normally seen in low glucose.
DMEM (low glucose, 335 ± 30 mOsm/L) was used for all experiments.
During the whole experiment this culture medium consisted of low glucose (1000 mg/l l = 5.55 mM) D-MEM (Gibco, Grand Island, NY), supplemented with 10% fetal calf serum (containing 0.5 mM glucose), 50 μg/ml gentamicin, 1.5 μg/ml fungizone.
This was also observed in the growth experiments on melibiose for cells precultured on low glucose concentrations.
Importantly, experiments knocking down BRAFV600E performed in serum free and low glucose medium also resulted in an increased of p-AMPKα levels (Fig 3D).
