Even metals essential for life can exert toxicity when present above certain threshold concentrations (Gadd, 2011).
Threshold concentrations, over which the polymer solutions have peculiar temperature behaviour, were defined.
The risk assessments for the existing CO2 pipelines show distances to harmful threshold concentrations from 1 to 7.2 km.
Threshold concentrations of eotaxin and RANTES increased the chemotactic potency of 5-oxo-ETE by more than 4-fold.
The screening tests were first performed with the purpose of defining individual threshold concentrations that can be detected.
Probably, further research with the establishment of threshold concentrations for the survival of N. guadelupensis will give more precise results.
That is, they do not consider probabilities of exceeding threshold concentrations for defined effects in the environment.
The limits of detection ranged from 0.1 to 73 ng/L were lower than or close to the odor threshold concentrations (OTCs).
Estimated environmental concentrations for Cry1A(b) were compared to threshold concentrations of concern for putative sensitive aquatic organisms as estimated from species sensitivity distributions.
Adenoviruses almost invariably proliferate in the gastrointestinal tract prior to dissemination, and critical threshold concentrations in stool correlate with the risk of viremia.
The onset of profound corrosion inhibition is achieved at threshold concentrations of 10−2 and 2 × 10−4 mol dm−3 for chromate and phosphate additions respectively.
