Chapter 7: The Control of Microbial Growth

Aseptic techniques

________ are important in surgery to minimize contamination from the instruments, operating personnel, and the patient.

Asepsis

Sepsis, from the Greek for decay or putrid, indicates bac- terial contamination, as in septic tanks for sewage treatment. What is the absence of significant contamination? Answer with a single words or term.

Microwaves

________ do not have much direct effect on microorgan- isms, and bacteria can readily be isolated from the interior of recently operated microwave ovens.

Iodine

________ is available as a tincture- that is, in solution in.

high temperatures

Decimal reduction time (DRT), or D value, is a third con- cept related to bacterial heat resistance. These ________ are most commonly achieved by steam under pressure in an autoclave.

Sterilization

________ is the removal or destruction of all living microorganisms.

iodophor

A(n) ________ is a combination of iodine and an organic molecule, from which the iodine is released slowly.

Membrane filters

________ are composed of such sub- stances as cellulose esters or plastic polymers, which have become popular for industrial and laboratory use.

Equivalent treatments

________ are as the temperature is increased, much less time is needed to kill the same number of microbes.

disk diffusion method

The ________ is used in teaching laboratories to evaluate the efficacy of a chemical agent.

intent of pasteurization of milk

What was to eliminate pathogenic microbes? Answer with a single words or term.

disk of filter paper

A(n) ________ is soaked with a chemical and placed on an agar plate that has been previously inoculated and incubated with the test organism.

form of dry heat sterilization

What is hot- air sterilization? Answer with a single words or term.