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Marianna [84]
3 years ago
8

Sputum samples are typically plated on blood agar, chocolate agar (blood agar containing lysed red blood cells), and MacConkey a

gar. Explain why each of these media may be helpful in identifying pathogens in lower respiratory infections.
Biology
1 answer:
Aleks04 [339]3 years ago
4 0

Answer:

Firstly there are several pathogens that are involved in lower respiratory infection.

  1. <em>Klebsiella pneumoniae</em>
  2. <em>Moraxella catarrhalis</em>
  3. <em>Pseudomonas aeruginosa</em>

<em> </em>

<em>Moraxella catarrhalis</em><em> </em>is able to grow on both blood and chocolate agar. Furthermore, these both agar are used to identify gram negative cocci.

<em>Pseudomonas aeruginosa </em>is a large gram negative rod shape bacteria that can only grow well on blood agar.

<em>Klebsiella pneumoniae</em> is a large gram negative rod shape bacteria that can only grow on MacConkey Agar.

Therefore all of these agar are important and helpful to identify pathogens that are responsible for lower respiratory infection.

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Answer:

21 minutes or 0.35 hours

Explanation:

The formula for exponential population growth is

A = A_0* e^{kt}\\

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A_0 = initial population of E.coli i.e 100

k is the rate of population growth i.e 2 as the population doubles

t is the time period i.e 20 minutes

Substituting the given values in above equation, we get -

A = 100 * e^{2 * \frac{20}{60} }\\\\A = 195

Generation time

G = \frac{t}{3.3 * log \frac{194}{100} } \\G = \frac{t}{0.949} \\G= 21 minutes

or 0.35 hours

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