Lab 6
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What are Psychrophiles ?
Grow well at 0 degree Celsius; optimum: 15 degrees or lower
What are Psychrotrophs?
Facultative psychrophiles; grow at 0 -7 Degrees Celsius
What are Mesophiles ?
Growth optima 25-45 degrees Celsuis. Majority of bacterial species are in group 25-45 degrees Celsius
What are Thermophiles?
grow at 55 degrees or higher
What are Hyperthermophiles?
grow at 90 degrees or above (HIGHEST)
What are Thermoduric?
bacteria that can survive boiling even though they cannot grow. *Usually they are spore forming.
ph range of Acidophiles
Thrive under highly acidic conditions (usually at ph 2.0) 0.0-5.5
ph range of Neutrophiles
Thrive in neutral pH environment (6.5-7.5) 5.5-8.0. BACTERIA are mostly neutrophiles.
ph range of Alkaliphiles
capable of survival in alkaline; growing optimally around a pH of 10 8.5-11.5
Function of buffer when growing bacteria ?
To neutralize acids produced by bacteria and create a pH equilibrium.
What is solute?
substance
what is solvent?
liquid
5 environmental factors that affect bacterial growth?
-temperature- specific growth temperature (determined by heat sensitivity of enzymes, membranes, ribosomes) - pH- affects activity of enzymes. THOSE IN BIOSYNTHESIS - osmotic pressure - nature - chemicals
hypotonic:
BURST- water moves into the cell, low solute
hypertonic
SHRINK- water leaves, high solute concentration. (plasmolysis)
isotonic
SAME concentration of solute inside/outside cell membrane.
what is a halophile?
tolerate saline(salt) concentrations