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Definition
| Used in media to neutralize acids |
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Definition
The general term for organisms capable of growth at
0°C |
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Term
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Definition
Capable of growth at high temperatures;
optimum 50-60°C |
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Definition
| Adapted to high salt concentrations, which are required for growth |
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Definition
| A phenomenon that occurs when bacteria are placed in high salt concentrations |
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Definition
| Term used in text for organisms that grow well at refrigerator temperatures; optimum growth is at temperatures of 20-30°C |
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Definition
| Microbes that grow better at high CO2 |
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Definition
| Members of the archaea with an optimum growth temperature of 80°C or higher |
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Term
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Definition
| The matrix that makes up a biofilm |
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Term
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Definition
| An enzyme acting upon hydrogen peroxide |
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Term
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Definition
| Rhizobium bacteria do this in symbiosis with leguminous plants |
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Term
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Definition
| Requires atmospheric oxygen to grow |
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Term
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Definition
| Requires atmospheric oxygen, but in lower than normal concentrations |
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Term
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Definition
| Does not use oxygen, but grows readily in its presence |
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Term
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Definition
| Does not use oxygen and usually finds it toxic |
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Term
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Definition
| Important source of energy, carbon, nitrogen, and sulfur requirements in complex media |
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Term
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Definition
| Breaks down hydrogen peroxide without generation of oxygen |
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Term
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Definition
| Formed in cytoplasm by ionizing radiation |
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Term
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Definition
| An enzyme that converts hydrogen peroxide into oxygen and water |
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Term
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Definition
| The toxic form of oxygen that is neutralized by superoxide dismutase - synonym for superoxide anions |
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Term
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Definition
| A component added to some culture media that makes the Petri plate into a self-contained anaerobic chamber |
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Term
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Definition
| Isolation method for getting pure cultures; uses an inoculating loop to trace a pattern of inoculum on a solid medium |
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Term
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Definition
| Colonies grow on agar surface for identification |
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Term
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Definition
| Used to increase the numbers of a small minority of microorganisms in a mixed culture to arrive at a detectable level of microorganisms |
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Term
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Definition
| Preservation method that uses quick-freezing and a high vacuum |
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Term
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Definition
| Accumulations of microbes large enough to see without a microscope |
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Term
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Definition
| Microbes added to initiate growth |
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Term
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Definition
| Usual laboratory designation for safe handling of tuberculosis |
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Term
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Definition
| Laboratory designation for the most dangerous microorganisms; personnel wear "space suits" |
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Term
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Definition
| A routine microbiology teaching laboratory would be designated this |
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Term
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Definition
| New cell numbers balanced by death of cells |
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Term
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Definition
| No cell division, but intense metabolic activity |
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Term
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Definition
| A logarithmic plot of the population produces an ascending straight line |
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Term
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Definition
| Used to grow obligate anaerobes; generally contain ingredients such as sodium thioglycolate that chemically combine with dissolved oxygen |
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Term
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Definition
| Designed to suppress the growth of unwanted bacteria and to encourage growth of desired microbes |
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Term
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Definition
| Nutrients are digests or extracts; exact chemical composition varies slightly from batch to batch |
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Term
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Definition
| Agar is a derived from a marine alga. |
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Term
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Definition
A few bacteria and the photosynthesizing
are able to use gaseous nitrogen directly from the atmosphere |
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Term
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Definition
| The most common microbes; their optimum growth temperatures are 25-40°C |
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Term
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Definition
| A complex medium in liquid form |
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Term
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Definition
| How turbidity is usually recorded in a spectrophotometer |
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Term
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Definition
| How the growth of filamentous bacteria is usually recorded |
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Term
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Definition
| Grow more efficiently aerobically than they do anaerobically |
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Term
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Definition
| do not require high salt concentrations, but they are able to grow at salt concentrations that may inhibit the growth of many other bacteria. |
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Term
| Phsophate salts, amino acids, and peptones |
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Definition
| are examples of buffers found in complex media |
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Term
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Definition
| Any nutrient material prepared fro the growth of bacteria in a laboratory |
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Term
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Definition
| melts at about the boiling point of water but remains liquid until the temperature drops to about 40°C |
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Term
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Definition
Dilutions of a bacterial mixture are poured into a Petri dish and mixed with melted agar; this is a plate counting method. |
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Term
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Definition
| Partially digested protein products that are used in complex media |
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Term
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Definition
| Usually necessary to grow obligate intracellular parasites such as rickettsias and chlamydias |
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Term
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Definition
| The general term for tests that estimate microbial growth by the time required for them to deplete oxygen in the medium is tests. |
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Term
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Definition
| When a single colony arises from a clump a bacteria, it is recorded as a(n) . |
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