Chapter 6 - Microbial Nutrition and Growth Flashcards
Physical requirements
temperature, pH, water
Affects of temperature on microbial growth
membrane fluidity, protein denaturation
2 Physical effects of water
Osmotic pressure, hydrostatic pressure
Chemical and energy requirements
oxygen, nitrogen, phosphorus, sulfur, trace elements, growth factors
4 Toxic forms of oxygen
singlet oxygen, superoxide radicals, peroxide anion, hydroxyl radical
2 Groups of organisms based on carbon source
autotrophs and heterotrophs
Autotrophs
utilize inorganic source of carbon, CO2
Heterotrophs
organisms that catabolize reduced organic molecules acquired from other organisms
2 Groups of organisms based on energy source
chemotrophs and phototrophs
Chemotrophs
organisms acquiring energy from redox reactions involving inorganic and organic chemicals
Phototrophs
organisms that use light as their energy source
2 Groups of organisms based on electron source
Organotrophs and lithotrophs
Lithotrophs
organisms acquiring electrons from inorganic sources
Organotrophs
organisms acquiring electrons from organic sources
6 Types of general culture media
defined, complex, selective, differential, anaerobic, and transport
