Micro 4000 - chapter 4

STUDY
PLAY

Terms in this set (...)

Generation time
time it takes to double (complete binary fission)
Exponential growth
population doubles each division
biofilms
polysaccharide-encased communities
Psychrophile
-5° to 20°C temp. range
Found in Arctic and Antarctic regions
Psychrotroph
0° to 35°C
important in food spoilage - can grow and very slow rates in the fridge
Mesophile
15°- 45°C
Pathogen; grow well at body temperature
Thermophiles
40°- 80°C
Common in hot springs, eukaryotic organisms begin to denature
Hyperthermophiles
75° to 110°C
Usually members of Archaea
Found in hydrothermal vents, can actively grow in boiling water
Thioglycollate medium
demonstrates organisms O2 requirements
Obligate Aerobes
absolutely have to have O2
superoxide dismutase and catalase
Obligate anaerobes
O2 is toxic to their environment
neither enzyme for ROS because ROS is made by use of O2
facultative anaerobes
happy no matter what; work well with O2, but don't NEED it
superoxide dismutase and catalase
microaerophiles
need a small amount of O2 (2-10%)
superoxide dismutase and catalase
aerotolerant anaerobes
don't use O2, but grow in the presensence of it
does not have catalase enzyme to break down H2O2 it has another one
neutrophiles
pH range of 5-8; make food more acidic to preserve it
optimum is 7
Acidophiles
grow optimally at pH below 5.5
Alkaliphiles
grow optimally at pH above 8.5
Halotolerant
withstand salt conditions
halophiles
must grow in high salt environment (hypertonic solution)
Photoautotrophs
energy from sunlight; carbon from CO2
Photoheterotrophs
energy from sunlight; carbon from organic compounds
Chemolithoautotrophs (also termed chemoautotrophs, chemolithotrophs)
energy from inorganic compounds; carbon from CO2
Chemoorganoheterotrophs (also termed chemoheterotrophs, chemoorganotrophs)
energy and carbon from organic compounds