Ch. 7 Unit 2

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Ch. 7 Unit 2
2014-02-12 18:21:55
Microbiology microbial nutrition ecology growth
Elements of Microbial Nutrition, Ecology, and Growth
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  1. Macronutrient
    Protein, carbohydrate, lipid
  2. Micronutrient
    Vitamins and minerals
  3. Heterotroph
    • Animals
    • depends on other life forms for carbon source
    • gets it from organic molecules like sugars
  4. Autotroph
    • self feeders
    • plants and algae
    • gets it from inorganic molecules like CO2
  5. Chemoheterotrophs
    derive carbon and energy from organic  compounds
  6. Photoautotrophs
    • Derive their energy from sunlight
    • use sunlight to create energy
    • primary source of organic matter for heterotrophs
    • primary source of O2
  7. Psyhrophile
    0 to 15 degrees celcius
  8. Mesophile
    20 to 40 degrees celcius
  9. Thermophile
    45 to 80 degrees celcius
  10. Aerobic
    • grows best with O2
    • Strict aerobe
    • Microaerophilic
    • Facultative
  11. Strict Aerobe
    • The more O2 the better for growth!
    • also called obligate aerobes
    • use O2 as the final electron acceptor in aerobic respiration
  12. Microaerophilic
    • Needs a little bit of O2 but too much also harms it
    • Candle jar
    • In a tube they will grow just below the surface
  13. Facultative
    • Grows well in both O2 and No O2 but grows slightly larger with O2
    • When in a tube growth will be present throughout the broth but best where it has the most O2
  14. Anaerobic
    • Grows best without O2
    • Strict Anaerobe
    • Aerotolerant Anaerobe
  15. Strict Anaerobe
    • Grows only without O2
    • Also called Obligate anaerobes
  16. Aerotolerant Anaerobe
    • Can grow with some O2 but it would really prefer none
    • When grown in a tube there will be growth evenly throughout the medium
  17. PH levels
    Cells grow best at a ph level of 6-8
  18. acidophiles
    like a PH of 0
  19. alkalinophiles
    like a PH of 10
  20. Halophiles
    • requires high salt concentrations 
    • withstands hypertonic conditions
  21. Facultative halophiles
    Can survive high salt conditions but is not required
  22. Barophiles
    withstand high pressures
  23. Mutualism
    both things benefit from the connection
  24. Commensalisms
    one benefits and one is not bothered
  25. Parasitism
    one is benefitted but one is harmed
  26. Binary Fission
    • the division of bacteria
    • the cell elongates
    • new DNA circle forms
    • then the cell divides into two identical cells
  27. Generation time
    The time needed for a complete division cycle
  28. Lag Phase
    little to no growth
  29. Log Phase
    • Rapid growth 
    • More susceptible to drugs at this point
  30. Stationary phase
    the max number of cells has been reached and there is a plateau in cell growth
  31. Death Phase
    rapid  death and drop in number of cells
  32. Turbidity
    cloudiness in a liquid