Notes 10-7-09 Part 2

Availability of water
distilled water would have availability of 1.0
our blood=.95-ecoli prefers this water avail.—virtually all bacteria that live in the human body
sea water=.90
honey=.80-bacteria that make us sick dont live in honey
-halophiles-salt loving-bacteria that live at low water availability-by havving very high solute concentration inside cell, halophiles are able to pull water into cell even when in very water poor environments

Oxygen:20% of atmosphere
1. Anaerobes: (strict) can't live in presence of any oxygen
(Alturnative: can live with or without Oxygen
2. Aerobes: Require oxygen to grow (use Oxygen as terminal electron acceptor; like mitochondrias)