Create an account
chemical agent used on inanimate objectsj (surface) to destroy microorganisms. Ex: alcohol
chemical agent that can be safely used externally on tissues to destroy microorganisms or inhibit their growth. Ex: alcohol
full strength can be toxic. 5-10 % is just as good as full strength because full strength can be toxic
the ratio of a dilution of an agent to the dilution of phenol that will kill all organisms in 10 minutes but not in 5 minutes
filter paper method
methods of evaluation the antimicrobial properties of a chemical agent using filter paper disks placed on an inoculated agar plate
ideal disinfectant should be...
fast acting, effective, penetrate ealily, easy to prepare, inexpensive, pleasant odor or none at all
specific chemical antimicrobial agents
soaps/detergents, acids/alkalis, heavy metals, halogens, alcohols, phenols, oxidizing agents, alkylating agents, dyes, other agents
decimal reduction time (DRT)
the length of time needed to kill 90% of the organisms in a given population at a specified temperature
reducing the number of pathogenic organisms on objects or in materials so that they pose no threat of disease
method of sterilization that uses a mebrane filter to separate bacteria from growth media
a numerial expression for the effectiveness of a disinfectant relative to that of phenol
quaternary ammonium compound (quat)
a cationic detergent that has four organic groups attached to a nitrogen atom
the killing or removal of ALL microorganisms in any material or on any object (surgical instruments)
thermal death point
the temperature that kills all the bacteria in a 24-hour-old broth culture at neutral pH in 10 minutes
thermal death time
the time required to kill all the bacteria in a particular culture at a specified temperature
ultrahigh temp (UHT) processing
a method of sterililzation milk and daury products by raising the temperature to 87.8 degrees C for 3 seconds
a method of evaluation the antimicrobial properties of a chemical agent using standard preparation of certain test bacteria
a detergent solution often used with other chmical agents to penetrate fatty substances
reduction in numbers of pathogenic organisms on objects or in materials so that they do not pose a disease threat
recommended method for testing that an autoclave has truly sterilized a load uses this
passing liquid through a 0.22-µm filter
method that kills bacteria in a liquid without damaging heat-labile proteins in the solution
used to disinfect instruments and skin (among the agents containing heavy metals)
can be used on skin, instruments, dises and furniture and to destroy discarded cultures
can be used to disinfect or to sterilize a variety of materials, but all are carcinogens
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together