Various chemical compounds that organisms use to sustain life
Optimum Growth Temperature
The temperature at which the organisms grow best
Minimum Growth Temperature
A temperature BELOW optimum on which organism ceases to grow
Maximum Growth Temperature
A temperature ABOVE optimum which an organism dies
Desiccation
The complete drying process or removal of moisture
Mesophiles
Microbes that grow best at moderate temperatures
Psychrophiles
Organisms that "love" cold temperatures
Thermophiles
Organisms that "love" high temperatures
Psychrotrophs
A group of psychrophiles
Moisture
The presence of slight to moderate amount of liquid, especially water
pH
The hydrogen ion concentration of the solution and thus the acidity or alkalinity of a solution
Psychroduric Organisms
Microorganisms that prefer warmer temperatures but can tolerate or endure very cold temperatures and can be preserved in the frozen state
Acidophiles
They prefer acidic environments, whereas alkaliphiles prefer environments that are alkaline
Vibrio cholerae is the only human pathogen that grows well above pH 8
Alkaliphiles
Microbes that prefer an alkaline environment
Osmotic Pressure
A physical method that inhibits growth by limiting availability of water for metabolic activity
Hypertonic
When the concentration of solutes in the environment outside of a cell is greater than the concentration of solutes inside the cell
Osmosis
The movement of a solvent (e.g.,water), through a permeable membrane, from a solution having a lower concentration of solute to a solution having a higher concentration of solute
Crenation
Shrinkage of cells
Hypotonic
When the concentration of the solutes outside the cell is less than the concentration of the solutes inside the cell
Plasmolysis
The condition when the cell membrane and cytoplasm shrink away from the cell wall
Hemolysis
The bursting of cells
Plasmoptysis
The escape of cytoplasm from the cell due to great pressure and the cell ruptures
Isotonic
When the concentration of solutes outside a cell equals the concentration of solutes inside the cell
Halophiles
Microorganisms that prefer salty environments
Haloduric Organisms
Organisms that do not prefer to live in a salty environment but capable of surviving there
Piezophiles
Microorganisms that thrive is an environment with extremely high atmospheric pressure
Fungi are cellular eukaryotic microorganisms that prefer acidic environments
Barometric Pressure
The pressure within the atmosphere of the Earth
Microaerophiles
Microorganisms that live in environments containing reduced concentrations of oxygen (around 5% oxygen)
Capnophiles
Microorganisms that grow best in environments rich in carbon dioxide
Bacterial Growth
The proliferation or multiplication of bacteria
Generation Time
The time it takes for one cell to become two cells by binary fission
Fastidious Organisms
Microorganisms that are difficult to grow in the laboratory
In Vitro
Events that occur outside the body
In Vivo
Events that occur inside the body
Nutrients
Various chemical compounds that organisms use to sustain life