Why is it that bacteria do not develop resistance to thechemical disinfectants or antiseptics? (What is an antiseptic?)

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Jean KeelingLv2

28 Sep 2019

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Controlling microorganisms in the environment is becoming increasingly difficult due to the development of resistance to common disinfectants and antiseptics. Some examples of chemicals that have been or which are currently being used are triclosan, triclocarban, benzalkonium chloride, and chloroxylenol, to name a few. Many scientists are now turning their attention to other methods to control bacterial contamination. Discuss using 'phages' and other methods to control bacteria. Do you think these methods are better? Safer?

skyhamster23

For each of the following bacteria, explain why it is oftenresistant to disinfectants.

a. Mycobacterium

b. Pseudomonas

c. Bacillus

rubywildebeest906

QUESTION 1: Escherichia coli is characterized as a facultative anaerobe. You set up an experiment to examine the growth of Escherichia coli in three environments: a GasPak jar (0% oxygen), a candle jar (10% oxygen), and the benchtop (22% oxygen). Aside from differing oxygen levels, all other culture conditions (such as temperature and media used) were kept constant. Which of the following represents the most likely outcome of the experiment?

A. E. coli will have heavy growth on the benchtop, moderate growth in the candle jar, and no growth in the GasPak jar.

B. E. coli will have heavy growth on the benchtop but moderate growth in the candle jar and the GasPak jar.

C. E. coli will have heavy growth in the GasPak jar and moderate growth in the candle jar and the benchtop.

D. E. coli should grow equally in all three growth environments.

QUESTION 2: Chloroflexus aurantiacus is a photoautotrophic bacterium that grows in hot springs. Which of the following serves as an energy source for C. aurantiacus?

A. The sun

B. Glucose (C₆H₁₂O₆)

C. C. aurantiacus does not need an energy source

D. Carbon dioxide (CO₂)

QUESTION 3: You are a manufacturer of polypropylene hypodermic syringes. Which of the following methods would be best for ensuring sterility of this heat-sensitive material?

A. Non-ionizing radiation

B. Ionizing radiation

C. Pasteurization

D. Autoclave

QUESTION 4: What is the primary difference between a disinfectant and an antiseptic?

A. Disinfectants are low-level germicides, whereas antiseptics are high-level germicides.

B. A disinfectant is microbiocidal, whereas an antiseptic is microbiostatic.

C. A disinfectant is used to decontaminate critical equipment, whereas an antiseptic is used to decontaminate semicritical equipment.

D. A disinfectant is used to decontaminate lifeless objects, whereas an antiseptic is applied to living tissue.

QUESTION 5: Your patient is receiving a spinal fusion to correct a skeletal defect. Which of the following germicides is recommended to sterilize the bone used for the transplantation?