Microbial Growth Flashcards
What are three types of Microbial Division
Binary Fission, Budding, Multiple Fission
The time it takes a cell to divide
Generation time
What are the 3 requirements for growth
energy, materials, appropriate conditions
Most pathogenic bacteria fall into this category of energy source
Chemoheterotrophs (energy from organic compounds)
Organisms that require oxygen to live
Obligate Aerobes
Organisms that require a low dose of oxygen
Microaerophiles
Organisms that can tolerate no oxygen, but would prefer it
Facultative Anaerobes
Organisms that require the absence of oxygen
Obligate Anaerobes
Organisms that can’t use oxygen but can tolerate it
Aerotolerant Anaerobes
Agent used to gather free iron (limiting reagent in growth)
Siderophore
4 environmental conditions that affect growth
temperature, pH, pressure, other organisms
Type of of organisms that live in us (in terms of temperature)
Mesophiles
Tolerates high salt concentrations
Halophiles
Tolerates high sugar concentrations
Osmophiles
Tolerates desiccating conditions (lack of water)
Xerophiles
Tolerates intense pressure
Piezophiles
Communities of microorganisms that are bound by a thick matrix. Used for life cycle or survivals advantage
Biofilms
Depict the amount of bacteria in a population over time
Bacterial Growth Curves
Allows for a chemically controlled system of microbial growth
Chemostat
Phase of growth curve with little to no cell division
Lag Phase
Phase of growth curve when bacteria divide logarithmically
Log Phase
Growth phase where population remains stable. growth = death
Stationary Phase
Growth phase where population decreases
Death Phase
Growth phase where dying cells release nutrients
Prolonged decline phase
