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Microbiology > Chapter 7 > Flashcards

Chapter 7 Flashcards

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Biology 101 flashcards
0
Q

Absence of significant contamination

A

Asepsis

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1
Q

Refers to microbial contamination. Condition resulting from growth and spread of bacteria in blood in tissues

A

Sepsis

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2
Q

Removal of pathogens from living tissue

A

Antisepsis

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3
Q

Removal of all microbial life including endospores

A

Sterilization

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4
Q

Process of treatment especially of canned foods to kill the vegetative cell and kill Clostridium botulinum endospores

A

Commercial sterilization

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5
Q

Removal of pathogens from non-living surfaces

A

Disinfection

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6
Q

Removal of microbes from a limited area, the skin is swabbed with alcohol for injection

A

Degerming

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7
Q

Reducing microbial counts on eating utensils and from good preparation areas

A

Sanitization

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8
Q

Substance that kills microbes

A

Biocides/Germicide

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9
Q

Inhibiting
Not killing
Bacteria

A

Bacteriostasis

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10
Q

Number of microbes
Environment
Time of exposure
Microbial characteristics

A

Effectiveness of microbial treatments

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11
Q

Alteration of membrane permeability
Damage to proteins
Damage to nucleic acids

A

Actions of microbial control agents

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12
Q

Kills microbes by denaturing enzymes

A

Moist heat

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13
Q

Lowest temperature at which all cells in a culture are killed in 10 min.

  1. Heat resistance of bacteria
  2. Clumping of the cells
  3. Amount of water present
  4. Presence of organic matter
  5. Past history of treatment
A

Thermal death point

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14
Q

Minimum length of time to kill all bacteria in a liquid culture at a given temperature

A

Thermal death time

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15
Q

Minutes to kill 90% of a population at a given temperature

Boiling kills many vegetative cells and viruses within 10 mins

A

Decimal reduction time

16
Q

Stem under pressure
Is most effectively method of moist heat sterilization
Kills microbes

A

Auto calving

17
Q

Reduces spoilage organisms and pathogens from foods. Kills vegetative cells

A

Pasteurization

18
Q

63 degrees for 30 mins

A

Low temp-long time

19
Q

72 degrees for 15 seconds

A

High temp-short time

20
Q

140 degrees for 1 seconds

A

Ultra high temperature

21
Q

Heat resistant organisms survive pasteurization but do not cause any threat because they will grow at storage temp

A

Thermoduric

22
Q

Kills by oxidation
Flaming inculcating loops
Incineration
Hot air sterilization.

A

Dry heat sterilization

23
Q

Filtration is the passage of a liquid or gas through a filter with pores small enough to retain microbes
Used to sterilize heat-labor heat sensitive materials like enzymes, vaccines, antibiotics
Microbes can be removed from air by high-efficiency particulate air filters

A

Filtration

24
Q

Water absence microorganisms cannot grow but remain viable

Viruses and endospores can resist

A

Desiccation

Microbiology (13 decks)

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