Micro Packet 3 Flashcards
(62 cards)
4 Growth requirements of bacteria
1) Temperature
2) Gas O2 REquirements
3) Nutriential
4) PH 6.5-7.5
Human blood pH
7.35-7.45
Destroys all bacteria
Thermal Depth Point
How many thermal death points are there for spores, and what are they for?
Two.
One for the vegetative form and one for the spore.
What temperature is best suited for growth?
Optimum temperature
Bacteria are classified according to…
growth at different temperatures
Cold loving bacteria
Psychrophilic
Medium temperature loving bacteria
Mesophilic
Heat loving bacteria
Thermophilic
Salt loving bacteria
Halophilic
Example of halophilic bacteria
Staphylococcus
Oxygen loving bacteria
Aerobes
CO2 loving bacteria
Anaerobes
Means Strict or only
Obligate
Means fundamentally tolerating. The gases can be present or absent.
Facultative
Grow only in the presence of O2
Obligate Aerobe
Grow only in the presence of CO2
Obligate Anaerobe
Fundamentally an anaerobe, but can grow in the presence of oxygen.
Facultative aerobe
Fundamentally an aerobe, but can grow in the absence of O2. Uses or tolerates a lack of O2.
Facultative Anaerobe
Types of Cultures:
Agar Plates
Agar slants
Broth (liquid)
Stabbs (Gelatin)
Used to study culture characters for growth patterns
Stabbs Culture
Types of media:
Complex Reducing Selective Differential Enrichment
Has extracts: Beef, yeasts, plants, blood; grows aerobes.
Complex Media
Has chemicals in it that combine to O2 to deplete the O2 in the media.
Reducing Media