Microbial Growth Flashcards
1
Q
Plate count
A
count of viable live cells, considered low end
2
Q
CFU
A
colony forming units, used instead of counting cells because more than one cell could have landed there and started the colony.
3
Q
serial dilution
A
diluting the bacteria in order to get 30-300 count, statistically significant.
4
Q
membrane filtration technique
A
filtering drinking water through a membrane to catch microorganisms then grow them on a petri plate. Opposite of diluting
5
Q
Turbidity
A
cloudiness of sample, indirect cell count, calibration curve
6
Q
Indirect methods of counting cells
A
measuring turbidity, measuring dry weight
7
Q
biofilms
A
ecosystems of bacteria that can form on anything.
8
Q
steps of biofilm attachment
A
- Reversible attachment
- First colonizers become irreversibly attached
- Growth and division
- Production of EPS and water channels
- Dispersion of some for new colony
