The phrase "an ext" is not correct and usable in written English as it is incomplete and lacks context.
It could potentially be used as an abbreviation for "an extension" in a specific context, but it is not standard.
Example: "Please send me an ext for the project deadline."
Alternatives: "an extension" or "an excerpt".
The percentage of total flavonoids was then calculated in quercetin equivalents according to the following formula: F = (0. 05 A ext ∕ A q ) 100 ∕ C ext where Aext and Aq were the absorbance of the extract and of quercetin, respectively, and Cext was the extract concentration (10 mg/ml).
In the deterministic description, the last equation leads to an additional term at the r.h.s. of the ODE for the concentration of A ext : + γ c A ∗ V tot V ext − c A ext.
The influx of exogenous autoinducer molecules, together with the efflux of culture medium, can be represented by the following reaction, A ext ↔ γ c A ∗ V tot γ ∅.
An autoinducer molecule can diffuse out of the cytoplasm of one cell into the medium, thereby increasing the number of molecules in the external volume by one; this increase in the level of A ext changes the probabilities of an autoinducer molecule to diffuse into any other cell.
Signalling molecules can diffuse passively in and out the cell and contribute to increase the external concentration of the autoinducer (A ext ) that can be eventually modified by an external influx of molecules (A∗) and a dilution protocol (see below).
We can further proceed with the analytical calculations by implementing, as in previous studies e.g. [ 45], a quasisteady approximation for the dynamics of the external autoinducer, i.e. c ˙ A ext = 0, so that, (8) c A ext = 〈 c A 〉 1 1 + k − N D r.
In our in silico stochastic experiments, the efflux is reproduced by removing molecules, A ext, from the medium and washing away cells by "deleting" a cell picked at random in the population each time a new cell is born.
As in some experiments [ 10], we assume that the cell culture grows in an environment where the concentration of the external autoinducer in the medium, c A ext, is kept fixed and under well-stirred conditions.
Such extrapolated value N a ext (100%) could then be used to calculate the long-term average duplication rate as rdup/ μ ¯ = 2 N a ext (100%)/ NgenesΔ p).
