Replication And Lifestyle Flashcards
Heterotrophic
Req organic substrates for e production and a wide substrate variety are used
Metabolism of most pathogenic bact
Take up and catabolise sugars
Peptides/aas
And nucleic acids to gen basic building blocks of anabolic process
Strict aerobes
Grow at atm O2 tensions
Strict anaerobes
Req O2 abscence for growth
Facuktative anaerobes
Can handle both presence and absence
Factors influencing bacterial griwth
Nutrients Temp pH Ion concs Atm Hydration
What may cause commensal bact pop alteration
Nutritional status Stress Age Antiobiotics (Pops are stable but not static)
Lag phase of growth
Bact adjust to enviro conditions
Log phase
Bact prolif exponentially by binary fission
Stationary phase
Nutrients become exhausted so growth arrest
Decline or death phasr
Bact number falls as incr hostility of enviro
What occurs during binary fission
A new CM and CW are formed
Chromosome duplicates and segregates
Septum spilts bact cell into 2 compartments
Separate into 2 cells
Growth phases
Lag
Log
Stationary
Decline/death
When sporulation Occurs
Stationary phase usually
In response to stress or nutrient limitation
Spore producing bacteria
Clostridium
Bacillus