Ex. 2-8; 2-9; 2-12 Flashcards
cardinal temperature
the minimum, maximum, and optimum temperature any single species can survive within.
psychorophiles
organisms that will only grow below 20 degrees Celsius with little or no fluctuation.
psychrotrophs
organisms adapted to cold habitats that fluctuate from about 0 to above 30 degrees Celsius.
mesophiles
organisms adapted to temperatures between 15 and 45 degrees Celsius.
thermophiles
organisms adapted to temperatures above 40 degrees Celsius.
obligate thermophiles
thermophiles that will not grow at temperatures below 40 degrees Celsius.
facultative thermophiles
thermophiles that will grow below 40 degrees Celsius
extreme thermophiles
thermophiles that can survive temperatures in the 65 and 110 degree Celsius range (up to 122 degrees Celsius for Methanopyrus)
What temperature do extreme thermophiles grow best at?
above 80 degrees Celsius
What are most bacterial residents in the human body, as well as numerous human pathogens?
mesophiles
What environmental factors affect the growth rate of microbes?
- temperature
- pH
- osmotic pressure
What does pH stand for?
pondus hydrogenii
What is Sorensen’s formula for the calculation of pH is expressed as:
pH = -log[H+]
How many moles of hydrogen ions per liter does water have? What is the pH of water?
10 -7 moles
pH of 7
acidophiles
organisms adapted to grow well in environments below about pH 5.5