3 questions on "Microbial Growth and Its Control - Osmolarity and Microbial Growth"

What are extreme halophiles?

Extreme halophiles require high levels (15–30%) of NaCl for growth (30% = 300 g/L).
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What are compatible solutes?
Compatible solutes are highly water-soluble organic molecules and include sugars, alcohol, and amino acid derivatives.
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How is the osmotic pressure in the surrounding environment fought?

Mechanisms for combating high osmotic pressure in surrounding environment involve increasing the internal solute concentration by:
  • Pumping inorganic ions from environment into cell
  • Synthesizing or concentrating organic solutes (compatible solutes)
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