Lesson 6 Flashcards
(41 cards)
bacteria which gain energy from light, subdivided into two groups on the basis of source of electron
Phototrophs
bacteria that uses reduced inorganic compounds such ss H2S as electron source.
Photolithotrops
uses organic compounds such as succinate as
electron source.
Photoorganotrops
Bacteria which gain energy from chemical compounds and cannot carry out photosynthesis
Chemotrophs
they gain energy from oxidation of chemical
compound and reduces inorganic compounds such as NH3 as electron source.
Chemolithotrops
they gain energy from chemical compounds and uses organic compound such as glucose and amino acids as source of electron.
.
Chemoorganotrops
nonpathogenic, free-living bacteria which uses solar energy or carbon dioxide as sole source of carbon to prepare its own food
Autotrophs
They utilized light to assimilate carbon dioxide.
Photoautotrops
they utilize chemical energy for assimilation of
carbon dioxide
Chemoautotrops
- bacteria which uses organic compound as carbon source and lack the ability to fix carbon dioxide.
Heterotrophs
-. bacteria that can grow at below 0°C to 20°C but the optimum temperature of growth is 15°C or below. It contains polyunsaturated fatty acids in their cell membrane which allows it to not freeze even at lower temperature hence it is a common contaminant in refrigerators.
Psychrophiles
bacteria that can grow even between 0°C to 30°C but optimum temperature for growth is 20-30°C
psychrotrophs (facultative psychrophiles)
-bacteria that can grow best between 25-40°C and optimum temperature for growth is 37°C.
Mesophiles
-bacteria that best grow above 45°C, contains saturated fatty acids in their cell membrane so their cell membrane does not become too fluid even at higher temperature, can survive pasteurization temperature
Thermophiles
capable of growing in mesophilic range
facultative thermophiles
true thermophiles or Stenothermophiles
obligate thermophiles
-bacteria that have optimum temperature of growth above 80°C.
Hypethermophiles
-bacteria that grows best at acidic pH
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Acidophiles
bacteria that grows best at alkaline pH
Alkaliphiles
bacteria that grows best at neutral pH (6.5-7.5)
Neutrophiles
-bacteria that require high concentration of sodium chloride (NaCl) for growth.
Halophiles
- bacteria that does not require NaCl but can tolerate low concentration of NaCl in growth media
Halotolerant
-bacteria that requires and cannot grow in the absence of oxygen
Obligate aerobes
bacteria that do not require oxygen but can use it if available
Facultative anaerobe
