Topic 7 Chp11_PhysicalChemicalCtrP

Topic 7 Chp11_PhysicalChemicalCtrP - TalaroChapter11

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Talaro Chapter 11 Controlling Microorganisms Outside the Body
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Living in the Microbial World Necessity of microbe removal? ‘The only good microbe is a dead  microbe?’  Daily life - Preparing food  - Cleaning  - Laundry - Bathing Medical setting - Non-critical items - Semi-critical items - Critical items Commercial food production
Background image of page 2
What are you buying?  And Why?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Decontamination Vocabulary    Sterilization Disinfection [inanimate objects] Sanitization [inanimate objects] Asepsis [living tissue] Degerming  Pasteurization
Background image of page 4
Physical/Chemical  Control:   not all microbes are  equally susceptible to  inactivation
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Describing microbial death Representing microbial death - express numbers as log 10 - example: 1,000 = 1 x 10 3 - graph viable (surviving) microbes - each log 10 decrease means 90% have been killed or 10% are surviving Given a beginning population of 10 6 microbes w/ 10 3 left after 3 minutes of treatment: (1,000/1,000,000)(100) = 1/10 = 0.1% ‘surviving’ or 100% - 0.1% = 99.9% ‘dead’
Background image of page 6
Factors affecting Microbial Inactivation Number of microbes Nature of microbe Inhibition vs. death In a population, killing requires time
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Other Factors Affecting Microbial  Survival/Inactivation  pH Temperature Presence of contaminating organic matter
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/23/2010 for the course BIO 307D taught by Professor Moore during the Fall '09 term at University of Texas at Austin.

Page1 / 19

Topic 7 Chp11_PhysicalChemicalCtrP - TalaroChapter11

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online