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What chemicals are used to control microbial growth?
What do antibiotics do?
control microbial growth within or on the body
What do disinfectants do?
control microbial growth on inanimate surfaces
What do antiseptics do?
control microbial growth on body surfaces
What are some factors that influence the control mechanism's for microbial growth's effectiveness?
- A. Number of Organisms Present
- B. Time / Duration of Treatment
- C. Concentration of Chemical Control Agent
- D. Penetration
What kills all microorganisms including endospores?
What removes only surface organisms by mechanical action?
What reduces the amount of bacteria to a safe level?
What is able to kill bacteria?
What stops the growth of bacteria?
What removes contamination?
What are some factors that influence microbial growth?
- number of organisms present
- time treatment is applied
- intensity of treatment
What are different ways of intensifying a treatment?
What are methods of applying heat to treat microbial growth and how effective are they?
- Incineration/ flaming (always effective)
- hot air oven (not completely effective, long time)
- boiling (not completely effective, long time)
- autoclaving (completely effective, short time)
- pasturization (not completely effective, short time, milk)
Why does moist heat sanitize better than dry heat methods or sterilization?
moist heat penetrates better
What are physical control methods?
- Heat/ high temperature
- Low temperature
What kind of filters are most often used in clinical situations and why?
- HEPA filters / N-95
- because they are designed to remove around 95% of microorganisms
What does low temperature method for control achieve?
slows or stops the growth of microorganisms
What does drying achieve?
slows growth of organisms by pulling water out of organisms
How does radiation control microorganisms?
- shred/ damaged DNA
What are two types of radiation?
Ionizing (Xrays) and Non Ionizing (Ultraviolet)
Why are Non Ionizing radiation methods for controll microorganisms not as effective?
they don't penetrate
How do chemicals control microorganisms?
the mechanical removal when chemical is applied
What are 7 chemicals used to control microbial growth?
- a. Alcohols
- b. Soaps
- c. Hydrogen Peroxide
- d. Phenol / Phenolics
- e. Chlorhexidine – In some surgical scrubs and dental products.
- f. Cetylpyridinium Chloride (CPC) – In many dental products.
- g. Halogens (ex. Iodine – In the surgical scrub Betadine; Chlorine – Active ingred. in bleach)
- h. Heavy Metals (ex. Silver)
- j. Aldehydes (ex. Formaldehyde, Glutaraldehyde)
What is the difference between Gas Sterilants (ex. Ethylene Oxide) and Gas Plasma (ex. High Energy Hydrogen Peroxide-based Treatment)?
sterilants are poisonous and plasma's are people friendly