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Requirements for microbial growth
Temp
pH
Osmotic pressure
Carbon
Nitrogen,sulfur&phosphorus
Trace elements
Oxygen
Organic growth factors
Classification of microbes by temperature
Psychophiles
Psychotrophs
Mesophiles
Thermophiles
Hyperthermophiles
Cold loving microbes
Psychophiles and psychotrophs
Human temperature loving microbes
Hot temperature loving microbes
Thermophiles and Hyperthermophiles
Was is carbon needed for microbial growth?
It’s the structural backbone of organic molecules
How is nitrogen aquiredwgats for microbial growth?
Bacteria will decompose protein materials to steal nitrogen
What does it mean if bacteria only grows in the top of the test tube?
It requires oxygen to grow. (Obligate aerobe)
What does it mean if bacteria only grows all over but primarily in the top of the test tube?
It doesn’t need oxygen to grow, but it grows better with it. (Facultative anaerobes)
What does it mean if bacteria only grows in the bottom of the test tube?
It prefers to grow with no oxygen (obligate anaerobes)
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