Section 5 Flashcards
What is colony morphology?
one of the first characteristics used to distinguish an organism from other bacterial species
What are characteristics of lysobacteria and pseudomonas?
slimy, irregular shape, fluoresces under UV light
What are characteristics of streptomyces?
bold colours, white fuzzy surface, spores
What are characteristics of bacillus?
sprawl thinly of agar, dull colours
What are solid cultures?
culturable cells that proliferate where they’re deposited
How do cells move in a liquid media?
randomly
What are growth kinetics?
relationship between growth rate of a population and concentration of a substrate
What does it mean when cells are planktonic?
They are in a free-floating state
What are liquid cultures grown with?
shaker platforms
How can bacterial growth by approximated?
measuring how much light of a wavelength is absorbed by liquid culture over time
What is a spectrophotometer?
measures absorption as optical density units
What happens to the liquid culture when cell concentration increases?
gets cloudier
What is the standard growth curve?
model for keeping track of how a population of cells in liquid culture changes over time
What is the lag phase?
very little growth
cells take cues from environment and makes metabolic adjustments
What do cells do after the lag phase?
divide rapidly
What is the logarithmic phase?
cells reproduce exponentially
What are produced towards the end of the logarithmic phase?
secondary metabolites
What is the stationary phase?
nutrients decrease, waste increases, growth decreases
cells dividing = cells dying
What is the death phase?
number of dying cells surpasses reproducing cells
What are spores?
inactive, highly resistant cells
What are mycelia?
long chains of vegetative cells
What are endospores?
dormant, thick-walled structures bacteria make to survive harsh conditions
