Effect of Salt Concentartion on Microbial Growth

bacteria that require high salt concentrations for growth

halophilic

organisms capable of growth in high salt concentrations even though they don’t prefer to live in salty environments

osmophiles

a measure of the force of movement of solutes across a semipermeable membrane

osmotic pressure

substances such as salts and sugars dissolved in a liquid to increase osmotic pressure

solutes

the concentration of solutes is equal inside and outside the bacterial cell

isotonic

the concentration of solutes is greater outside the bacterial cell so osmotic pressure is high

hypertonic

the concentration of solutes is greater inside the bacterial cell so the osmotic pressure is low

hypotonic

water flows across a membrane toward the side that contains

the highest solute concentration

in which direction would water in bacterial cells move if the cells were introduced to a hypotonic solution

inward

what organism tolerates little salt

E. coli

what organism tolerates a broad range of salt concentration

S. aureus

What organism only grows in high salt conditions

H. salinarium