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Flashcards in Chapter 7 Deck (25):
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Refers to microbial contamination. Condition resulting from growth and spread of bacteria in blood in tissues

Sepsis

1

Absence of significant contamination

Asepsis

2

Removal of pathogens from living tissue

Antisepsis

3

Removal of all microbial life including endospores

Sterilization

4

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

Commercial sterilization

5

Removal of pathogens from non-living surfaces

Disinfection

6

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

Degerming

7

Reducing microbial counts on eating utensils and from good preparation areas

Sanitization

8

Substance that kills microbes

Biocides/Germicide

9

Inhibiting
Not killing
Bacteria

Bacteriostasis

10

Number of microbes
Environment
Time of exposure
Microbial characteristics

Effectiveness of microbial treatments

11

Alteration of membrane permeability
Damage to proteins
Damage to nucleic acids

Actions of microbial control agents

12

Kills microbes by denaturing enzymes

Moist heat

13

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

Thermal death point

14

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

Thermal death time

15

Minutes to kill 90% of a population at a given temperature
Boiling kills many vegetative cells and viruses within 10 mins

Decimal reduction time

16

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

Auto calving

17

Reduces spoilage organisms and pathogens from foods. Kills vegetative cells

Pasteurization

18

63 degrees for 30 mins

Low temp-long time

19

72 degrees for 15 seconds

High temp-short time

20

140 degrees for 1 seconds

Ultra high temperature

21

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

Thermoduric

22

Kills by oxidation
Flaming inculcating loops
Incineration
Hot air sterilization.

Dry heat sterilization

23

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

Filtration

24

Water absence microorganisms cannot grow but remain viable
Viruses and endospores can resist

Desiccation