lab 28 and yoghurt Flashcards
What are psychrophiles?
optimal growth between -5 and 20 C, can be found in supercooled waters
what are mesophiles?
optimal growth between 20 and 50
most bacteria fall here
what temperature do most pathogens grow in?
35 to 40
what are thermophiles?
growth between 50 to 80
occurs in soils
fermentation piles
what are hyper thermophiles?
growth above 80 degrees
mostly archaea
live in superheated waters
what are psychrotrophs?
capable of growth in lower or higher temperatures
what are some psychotrophs?
campylobactor
what can temperature affect?
enzyme activity
metabolism factors in the cell
what happens to cell activity in low and high temperatures?
low chemical activity
high denature
what bacteria is found in commercial yoghurt?
Streptococcus thermophilus and Lactobacillus bulgaricus.
what happens to lactose once it is broken down?
glucose 6 phosphate
what is a homolactic bacteria?
ferments sugars
what ph does casein begin to curdle?
4.6
