Ch.5 Interactive glossary Flashcards
A bacteriological medium that binds oxygen gas from the atmosphere and creates an environment suitable for anaerobic growth.
Thioglycollate broth
A bacterium not inhibited by oxygen gas
Aerotolerant
A chemically defined medium in which the nature and quantity of each component is identified.
Synthetic medium
A chemically undefined medium in which the nature and quantity of each component has not been identified.
Complex medium
A common bacteriological growth medium consisting of beef extract, peptone, and water.
Nutrient broth
A common bacteriological growth medium consisting of beef extract, peptone, water, and agar.
Nutrient agar
A differential growth medium that encourages the growth of staphylococci by containing a high percentage of salt, which is inhibitory to most other microorganisms.
Mannitol salt agar (MSA)
A growth medium containing special nutrients to grow fastidious organisms.
Enriched medium
A growth medium in which different species of microorganisms can be distinguished visually.
Differential medium
A growth medium that contains ingredients to inhibit certain microorganisms while encouraging the growth of others.
Selective medium
A laboratory test in which a statistical evaluation is used to estimate the number of bacterial cells in a sample of fluid; often employed in determinations of coliform bacteria in water.
Most probable number test
A measure of the viable cells by counting the number of colonies on a plate; each colony presumably started from one viable cell.
Colony forming unit
A microbe that grows best without salt but can tolerate low concentrations.
Halotolerant
A microorganism that cannot grow in the presence of added sodium chloride.
Nonhalophile
A microorganism that grows at acidic pHs below 4.
Acidophile
A microorganism that lives under conditions of high atmospheric pressure.
Barophile
A polysaccharide derived from marine seaweed that is used as a solidifying agent in many microbiological culture media.
Agar
A portion of a bacterial growth curve encompassing the first few hours of the population’s history when no growth occurs.
Lag phase
A procedure to estimate the number of cells in a sample dilution spread on an agar plate.
Standard plate count
A process by which a mixed culture can be separated into pure colonies and the colonies isolated
Pour plate method
A process by which a mixed culture can be streaked onto an agar plate and pure colonies isolated.
Streak plate method
A prokaryote requiring relatively high concentrations of salt (NaCl).
Halophile
A prokaryote that has an optimal growth temperature above 80 degrees C.
Hyperthermophile