contestada

Plating 1.0 ml. of a sample diluted by a factor of 10 produced 43 colonies. What was the original concentration in the sample?

Respuesta :

Answer:

[tex]4.3[/tex] CFU/mL

Explanation:

Given -

Dilution factor for sample [tex]= 10[/tex]

Number of colonies produces [tex]= 43[/tex]

Volume of sample before dilution[tex]= 1[/tex]mL

Volume of sample with dilution

[tex]= 1* 10\\= 10[/tex]mL

As we know,

Original concentration of sample is equal to CFU divided by the sample volume.

Thus, original concentration in the sample

[tex]= \frac{43}{10} \\= 4.3[/tex] CFL/mL