The study, he noted, does not appear to identify a threshold concentration level, below which particles are safe.
The long-term threshold concentration is around 0.25 0.30 μg m−3.
The behavior of the threshold concentration was one of the key features of this research.
The threshold concentration for NH3 in rearing water of African catfish (Clarias gariepinus) was assessed.
The most potent of these agonists is quinidine, with a threshold concentration of about 0.3 µM, whereas epiquinidine and ethylhydrocupreine activate the receptor at or beyond 10 µM.
Ammonium concentration decreased above the threshold concentration of 0.8 mg/ml by ∼14%.
The same threshold concentration was found to apply at both operating conditions.
Nausea threshold concentration for first response was established and then this threshold was confirmed.
Stimulated lymphocyte T and B proliferation was significantly decreased at a threshold concentration of 0.3%.
A resin acid residuum, or threshold concentration, has been found to increase under acidic growth conditions.
Once a threshold concentration has been reached, the AIs bind to specific QS receptors that initiate activation or repression of the transcription of various target genes1,2,3.
