Chapter 5: Microbial Growth + Growth Control
Home > Preview
The flashcards below were created by user
on FreezingBlue Flashcards.
Describe continuous growth culture and chemostat
Continuous culture = open system of microbial culture of fixed volume
fresh medium is added at a constant rate while equal number of culture is removed; this is the dilution rate
- Chemostat = most common type of continuous culture
- "wherein both growth rate and cell density can be controlled independently"
these two factors control growth rate + cell density: 1) dilution rate 2) concentration of a limiting nutrient
- hey a concept:
- at too high of a dilution rate, the organism cannot grow fast enough to keep up and is washed out. at too low of a dilution rate, cells may die from starvation because the limiting nutrient is not being added fast enough to support minimal cell metabolism.
cell density is controlled by a limiting nutrient. increasing limiting nutrient concentration will increase cell density but not increase growth rate
How are microorganisms classified by their growth temperature optima?
- Psychrophile - low temperature
- Thermophile - high temperature
- mesophile - moderate / midrange temperature
- hypothermophile - very high temperature
What are psychrotolerant microbes?
Organisms that can grow at low temperature (0) but have an optima kinda higher (20-40)
Home > Flashcards > Print Preview