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Chapter 7
Tortura. Chapter 7 the control of microbial growth
28
Microbiology
Undergraduate 1
10/12/2011

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Term
Sterilization
Definition
Destruction or removal of all forms of microbial life including endospores but with the possible exception of prions.
Term
Commercial Sterilization
Definition
Sufficient heat treatment to kill endospores Clostriduim botulinum in canned food
Term
Disinfection
Definition
Destructive of vegatative pathogens
Term
Antisepsis
Definition
Destruction of vegetative pathogens on living tissue
Term
Degerming
Definition
Removal of microbes from a limited area, such as the skin around an injection site.
Term
Sanitization
Definition
Treatment intended to lower microbial counts on eating and drinking utensils to safe public health levels
Term
The death rate of Microbes is always
Definition
Constant
Term
1. The number of microbes to begin with.
2. Enviromental Influences
3. Time of Exposure
4. Microbial Characteristics.
Definition
4 factors influence the effectiveness of antimicrobial treatments:
Term
Thermal Death Point (TDP)
Definition
________ is the lowest temperature at which all the microorganisms in a particular liquid suspension will be killed in 10minutes.
Term
Pasteurization
Definition
is a process of heating a food, usually liquid, to a specific temperature for a definite length of time, and then cooling it immediately. This process slows microbial growth in food.
Term
High temperature short time pasteurization
Definition
Lowers bacterial count, by passing liquid through a heat exchange.
Term
Filtration
Definition
is the passage of a liquid or gas through a screenlike material with pores small enough to retain microorganisms .
Term
Filtration is used to
Definition
sterilize heat sensitive materials, such as some culture media, enzymes, vaccines, and antibiotic solutions
Term
High Efficiency particulate air filters HEPA
Definition
remove almost all microorganisms larger than about .3 diameter.
Term
desiccation
Definition
in the absence of water, microorganisms cannot grow or reproduce but can remain viable for years.
Term
What are examples of Ionizing Radiation
Definition
Gamma Rays, X Rays, or high energy electron beams. Has a wavelength shorter than that of non-ionizing radiation.
Term
Non Ionizing Radiation- Wavelength and example
Definition
has a wavelength longer than that of ionizing radiation, usually about 1nm. UV rays is an example.
Term
Use-dilution test
Definition
A method of determining the effectiveness of a disinfectant using serial dilutions.
Term
disk-diffusion method
Definition
An agar-diffusion test to determine microbial susceptibility to chemotherapeutic agents; also called Kirby-Bauer test.
Term
Phenol
Definition
Also called carbolic acid.
Term
Phenolics
Definition
A synthetic derivative of phenol used as a disinfectant.
Term
ALcohol
Definition
An organic molecule with the functional group—OH.
Can effectivley kill bacteria and fungi but not endospores and nonenveloped viruses.
Term
ethanol and propanol
Definition
Two of the most commonly used alcohols are ____ and _____.
Term
Surface-active agents or surfactant
Definition
Any compound that decreases the tension between molecules lying on the surface of a liquid; also called surfactant.
Term
Quaternary Ammonium compounds
Definition
A cationic detergent with four organic groups attached to a central nitrogen atom; used as a disinfectant.
Term
Nitrosamines
Definition
A carcinogen formed by the combination of nitrite and amino acids.
Term
Aldehydes
Definition
An organic molecule with the functional group. ________ are among the most effective antimicrobials.
Term
Supercritical Fluids
Definition
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