Because of such self-reinforcing positive feedbacks (which, because of the accidental humour of science, we must remind ourselves are, in fact, negative), once a critical greenhouse concentration threshold is passed, global warming will continue even if we stop releasing additional greenhouse gases into the atmosphere.
Rather, a concentration threshold and cell type dependent toxicity of all particle types was observed.
The low concentration threshold of these assemblies in alkali solution is probably due to their nonionic character.
The elements above the concentration threshold of contamination (CTC) were As, Cd, Hg, Pb, Se and Zn.
The mechanical behaviour is dominated by the formation of positive synergies between protein and nanoclay above a nanoclay concentration threshold.
Furthermore, CaCl2 doped microparticles had a higher concentration threshold with regard to homogeneity when compared with NaCl doped microparticles.
We quantify the dependence of growth retardation on drug concentration and identify the concentration threshold above which growth retardation is evident.
The proposed optosensor provides rapid binary yes/no overall responses, being appropriate for the screening of this family of antibiotics above or below a pre-set concentration threshold.
In previous work, we used an arbitrary concentration threshold to switch between two dynamic regimes of the growth catalyst in order to define growth boundaries.
Decreased ingestion rates at a certain prey density suggests a possible prey concentration threshold, below which the ciliate's ability to graze human pathogenic bacteria diminishes.
Actually, C x, t) is assumed to be equal to the chloride concentration threshold over which the steel corrosion is triggered on failure condition.
