The Co content of kamacite is also much lower than the concentrations observed in OCs (below detection limit of 0.18 wt% versus 0.44 37 wt%).
Accordingly, when the concentration of α-ketoglutarate falls below a certain threshold (28% of the concentration observed in the normal cells, Fig. S 1), the cells reside in the steady state characterized by higher glucose uptake rates, with the carbon flux shifting towards lactate formation.
Such levels would also fall well below the 40 uM concentrations observed in the wildtype strain during growth in the same media, however data regarding the concentration of AI-2 necessary to result in signaling of C. jejuni is currently unavailable and thus interpretation of the biological meaning of these levels in hampered.
After extraction and dilution, these concentrations correspond to 0.023 0.140 nM used in the bioassay, which are well below threshold concentrations observed for single contaminants previously reported (Legler et al. 1999; Schrader and Cooke 2003).
However, it should be stressed that liver fat concentrations observed in healthy men at baseline and after fructose overfeeding were still far below concentrations observed in patients with NAFLD (70).
The minimum concentration observed for all 23 compounds was below the detection limit of the instrument.
Obatoclax, on the other hand readily induced apoptosis, regardless of BCL2A1 and ABCB1 protein expression, at concentrations below the dose limiting toxicity concentration observed in phase 1 clinical trial [ 39].
Over the past 15 years, several studies with chemical mixtures (e.g., hormonally active chemicals or pesticides) at concentrations near or below the no observed effect concentration (NOEC) or the NOAEL have reported potentially harmful biologic responses (Cavieres et al. 2002; Rajapakse et al. 2002; Welshons et al. 2003).
Considering this effect culmination enables to link long-term effects of repeated low-dose toxicant pulses at concentrations that should have no effect on the number of individuals within a population (i.e., below the no observed effect concentration for each individual pulse).
It is often suggested that low concentrations of environmental pollutants are of no concern because, in most circumstances, concentrations are below the No Observed Effect Levels (NOEL); i.e. environmental levels of each individual chemical have been shown to be below the minimum concentrations known to induce a physiological response.
