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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.
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BMC Microbiology

ISSN: 1471-2180

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