If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

Physical and Chemical Agents
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

1

50

5

10

1

50

5

10

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Physical and Chemical Agents
Ethylene oxide is used to destroy or kill which of the following microbes?

Spores

Fungi

All of these

Bacteria

Spores

Fungi

All of these

Bacteria

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Physical and Chemical Agents
Which of the following skin disinfectant(s) is/are most frequently used?

Isopropyl alcohol

Ethyl alcohol

Both (a) and (b)

none of these

Isopropyl alcohol

Ethyl alcohol

Both (a) and (b)

none of these

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Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

lowering osmotic pressure

creating a hypotonic environment

raising pH

creating a hypertonic environment

lowering osmotic pressure

creating a hypotonic environment

raising pH

creating a hypertonic environment

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Physical and Chemical Agents
Which of the following is best used for long term storage of microbial samples when carried out properly?

Storage in a freezer at -10°C

Storage in a freezer at ultra low temperatures (-70°C)

Storage in a refrigerator on an agar slant

Storage on a petri plate at room temperature

Storage in a freezer at -10°C

Storage in a freezer at ultra low temperatures (-70°C)

Storage in a refrigerator on an agar slant

Storage on a petri plate at room temperature

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Physical and Chemical Agents
The time in minutes at a specific temperature needed to kill a population of cells is the

F value

thermal death point

thermal death temperature

decimal reduction time

F value

thermal death point

thermal death temperature

decimal reduction time

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Physical and Chemical Agents

Physical and Chemical Agents If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

Physical and Chemical Agents Ethylene oxide is used to destroy or kill which of the following microbes?

Physical and Chemical Agents Which of the following skin disinfectant(s) is/are most frequently used?

Physical and Chemical Agents Preservation of foods by using salts and sugars works by

Physical and Chemical Agents Which of the following is best used for long term storage of microbial samples when carried out properly?

Physical and Chemical Agents The time in minutes at a specific temperature needed to kill a population of cells is the

Physical and Chemical Agents
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

Physical and Chemical Agents
Ethylene oxide is used to destroy or kill which of the following microbes?

Physical and Chemical Agents
Which of the following skin disinfectant(s) is/are most frequently used?

Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

Physical and Chemical Agents
Which of the following is best used for long term storage of microbial samples when carried out properly?

Physical and Chemical Agents
The time in minutes at a specific temperature needed to kill a population of cells is the