Topic 5: Microbes in industry Flashcards
how does uranium work
to contain
-bact reduces uranium which decreases solubility in groundwater and holds it in place
how does petroleum work
-natural pollutant and bact have evolved to use it as a carbon source
–bact will break it down
how do plastics work
-bact can use it as carbon and E source
what is the purpose of waste water treatment
to decrease organic content
how do we measure water quality
BOD - biochem oxygen demand
a meas of the amnt of ox needed by microbes to remove/oxidize org matter from water
what are primary and secondary treatments
prim - screen water and pull out big pieces of org material
sec:
trickling filter - rocks provide surface for biofilm which happily digest org material
activated sludge - stir, aerate, circulate creates aerobic env for orgs to oxidize org material
rain gardens
what are intrinsic factors
the composition of food affects what types of microbes grow and dictate metabolism
what are extrinsic factors
external factors (temp, humidity, contam)
easy to control
3 ways to preserve food
high temp
remove water
chemicals/preservatives
what are the two categories of food borne infections and food intoxications
infection - host ingests pathogen and path est’s self and reps
intoxication - prods exotoxins which we then ingest directly t/f fast
features of fermented milk products
most rely on lactic acid bact (LAB)
acid tolerant, non sporulating w strict ferm met
what can fermentors do
prevent growth of other orgs
–probiotics (good and we dont ferment them)
what is chocolate
natural ferm
microbial succession
1.yeast break down pectin, release co2, ethanol, which lims growth
2.LAB prod lactate, ph drops
3.acetic acid bact then ox ethanol to acetate
sourdough
natural ferm
successive
symbiotic cult of yeast and lab
kombucha
SCOBY - symbiotic colony of bact and yeats
