It is worth noting that the previously mentioned PGSE NMR experiments were carried out at concentrations above that which is usually used in single-site catalysis, and the existence of these aggregates at lower, more relevant, concentrations is more unlikely.
However, because the experiment was conducted abiotically with a relatively high reaction rate and within an artificial medium, the sensitivity of geophysical methods to calcium carbonate precipitation at lower, field relevant rates and in the presence of field derived sediments warrants further evaluation.
The frequency of nocturnal hypoglycaemia was also lower in relevant patients before transfer (0.7 vs 0.9 episodes per patient-year).
Much of the in vivo uptake work used for these predictions expose fish to very high water concentrations and extrapolates back to these lower environmentally relevant values.
However, increased metastasis occurred only upon administration of a very high sunitinib dose, but not when lower, clinically relevant doses were used.
Although these studies indicate a weak estrogenic activity with effects beyond 10 μg/L, negative impacts on sexual differentiation in aquatic vertebrates were also reported at lower, environmentally relevant concentrations.
Thus, the increased flexibility of thermophilic proteins at higher temperature mimics the flexibility of mesophilic active sites at their lower physiologically relevant temperature, and this comparative flexibility is associated with optimal protein function.
Although higher concentrations of resveratrol (~100 μM) induces cell death in cancer cells [ 24], the current study suggest that lower physiologically relevant dose of resveratrol (~1 μM) prevent the migration and invasion of cancer cells from the primary site.
These four fundamental issues are problematic for risk assessment methods used by regulatory agencies, because they challenge the traditional use of extrapolation from high-dose testing to predict responses at the much lower environmentally relevant doses.
We infer that the PAH bioactivation potency from colon microbiota also occurs at lower and relevant concentrations for human exposure and that the presence of soil does not eliminate this potency.
