An enriched media in microbiology is one that has been supplemented by nutrient-rich materials such as blood or serum. It is used when the growth of specific organisms is desired. The media is supplemented with the nutrients that the organism needs.
A culture medium is used for the growth, storage and transport of microorganisms in the laboratory. It can be solid or liquid. Fastidious organisms will not grow without specific nutrients, so the media must be enriched to encourage their growth. For example, blood agar is used to grow bacteria, such as several species of streptococcus. Chocolate agar is a medium comprised of hemoglobin and other supplements, which is used to isolate Haemophilus and Neisseria.Learn More
The most important regulator of electrolyte concentrations is aldosterone, which is a steroid produced by the adrenal glands in the kidneys. It balances electrolytes by stimulating the kidneys and colon to increase the absorption of sodium, while releasing excess potassium. The kidney hormone renin stimulates the release of aldosterone in response to a high potassium level, lowered blood flow to the kidneys or falling blood pressure.Full Answer >
Recrystallization purifies chemical compounds in solvents. It works best when there is only a small quantity of impurities in the compound.Full Answer >
Constants in an experiment refer to things that do not change when repeating trials in the experiment. The two primary types of constants are physical constants and control constants.Full Answer >
A burette, or buret, is used to dispense precise and small amounts of liquid. Burettes have a stopcock, or spigot, at the end that allows substances to be dropped into other substances at slow rates. Like a water faucet for a hose on a house, turning the spigot more increases liquid flow, and turning it less reduces the amount of fluid that runs through the system.Full Answer >