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Table 1 Estimates from single population experiments (experiment 1) of the intrinsic growth rate ( ψ ), maximum density ( K ), lag-phase ( λ ) and initial concentration ( N 0 )

From: The IncI1 plasmid carrying the bla CTX-M-1 gene persists in in vitro culture of a Escherichia coli strain from broilers

Parameter Value 95% confidence interval AICc*
Best fitting model    -19.36
ψ 2.04 h-1 (1.95 – 2.14)  
K 9.1 108 cfu/ml (8.0 108 – 10.4 108)  
λ 102** 0.71 h (0.41 – 1.08)  
λ 106*** 1.30 h (0.90 – 1.72)  
N 0 102** 0.8 102 cfu/ml (0.5 102 – 1.2 102)  
N 0 106*** 0.9 106 cfu/ml (0.5 106 – 1.6 106)  
Full model -15.13
ψ R 2.04 h-1 (1.95 – 2.14)  
ψ T 2.09 h-1 (2.00 – 2.19)  
ψ D 2.09 h-1 (2.00 – 2.19)  
K R 10.7 108 cfu/ml (8.2 108 – 58.6 108)  
K T 10.0 108 cfu/ml (7.0 108 – 14.3 108)  
K D 7.6 108 cfu/ml (5.3 108 – 10.9 108)  
λ 102** 0.71 h (0.41 – 1.08)  
λ 106*** 1.28 h (0.89 – 1.70)  
N 0 102** 0.8 102 cfu/ml (0.5 102 – 1.2 102)  
N 0 106*** 0.9 106 cfu/ml (0.5 106 – 1.6 106)  
  1. *AICc = Akaike’s Information Criterion (AIC) corrected for a finite sample size n.
  2. AICc = AIC + 2 k (k + 1)/(n-k-1), in which k is the number of parameters in the model.
  3. **Estimate for experiments with a start culture of 102 cfu/ml.
  4. ***Estimate for experiments with a start culture of 106 cfu/ml.
  5. The full model estimates different parameters ψ and K for each population (D, R or T) and different parameters λ and N 0 based on the concentration of the start culture. The best fitting model was the one with different parameters for the initial concentration and lag-phase based on the concentration of the start culture, but with equal parameters for the other parameters of D, R and T.