2.6 Flashcards
Types of microorganisms
BAE
Bacteria
Eukaryota
Archea
What’s important about these microorganisms- what can they do?
High Adaptation, easy cultivate, fast growth speed
MicroOrganisms require ______ _____ to grow if they can not develop
Growth media
Growth media gives organisms
Raw materials and energy
Organism can obtain energy from
Chemical substances
Photosynthesis
Liquid medium- Broth
Solid media - agar jelly
Fermenter- what is it simply used for?
Place where microorganisms can grow in large quantities
What are the types of culture conditions?
Sterility, temperature control, oxygen levels, pH,
Importance of sterility
Reduces competition for nutrients and reduces spoiling the product. Stops contamination
Temperature control importance
Optimum growth rate
Importance of oxygen levels
For respiration
Importance of pH
Use buffers to control how acidic or alkaline the medium is
What happens during the lag phase of a growth curve?
Little to no increase in cell number
Enzymes are induced to metabolise substrates
What happens during the log/exponential phase?
Cells grow and multiply at the maximum rate
Rapid growth due to plentiful nutrients
What happens during the stationary phase?
Nutrients in culture becomes depleted or produces toxic metabolites.
Rate of production of news cells equals the rate of death
During the stationary phase what is also produced
Secondary metabolites
