Welcome to JAAN's science class!!

Big hi to all of you! I'm an undergraduate following a Bsc in bioscience. Trust me I know the feeling of surfing around the net for ages and getting nothing in return! Or getting something worthless for the time we spent surfing. So I started this blog adding the science stuff I have noted which I think might help someone in their home work. Ok then enjoy!

18 January 2012

Diversity of bacteria according to nutritional requirments, temperature, Oxygen conditions and water activity



Nutritional type

Energy source
Carbon source
Examples
Photoautotroph
Light
Inorganic carbon, i.e. CO2
Some purple and green bacteria (Chromatium)
Photoheterotroph
Light
Organic compounds
Some purple and green bacteria (Rhodospirillum)
Chemoautotroph (Lithotroph, Lithoautotroph)
Inorganic compounds; H2, H2S, NH3
CO2
Many Archaea and few bacteria (Nitrosomanas)
Chemoheterotroph (Heterotroph)
Organic compounds
Organic compounds
Few Arcaea and many bacteria (Pseudomonas)


Type

Minimum (0C)
Optimum (0C)
Maximum (0C)

Psychrophile
Below 0
10-15
Below 20
Contain unsaturated fatty acids in plasma membrane to tolerate.
psychrotroph
0
15-30
Above 25
Able to grow at low T but prefer moderate T
Mesophile
10-15
30-40
Below 45
Most bacteria especially the ones associated with warm-blooded animals.
Thermophile
45
45-70
Above 100
Contain Saturated fatty acids in plasma membrane. High glucose and carbon content as well as high melting point for DNA.
Hyperthermophile
80
80-115
Above 115
Contain phytane and modified proteins in plasma membrane. High glucose and carbon content as well as high melting point for DNA.


Type

Aerobic condition
Anaerobic condition
Obligate aerobe
Growth
No growth
Microaerophiles
Growth; when the O2 is at very low level
No growth
Obligate anaerobe
No growth; O2 is toxic
Growth
Facultative anaerobe/ facultative aerobe
Growth; Not essential to grow but utilized when available
Growth
Aerotolerant anaerobe
Growth; neither essential nor utilized
Growth

Type

Speciality
Halophile
Require NaCl for growth
Halo tolerant
Able to grow at moderate salt concentrations but grow best in the absence of NaCl
Osmophile
Able to grow in high levels of suger
Xerophile
Able to grow in dry conditions

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