Orderly and clear summary of chapter 5 part 2 what is discussed during the microbiology lectures. With this summary you will save a lot of time. I passed this course with a 7,5. Good luck :)
Test Bank For Brock Biology of Microorganisms 15th Edition By Michael T. Madigan 2024 A+
Test Bank for Brock Biology of Microorganisms, 15th Edition by Madigan, 9781292235103, Covering Chapters 1-33 | Includes Rationales
Buy the official test bank for Brock Biology of Microorganisms, Madigan,15e
All for this textbook (62)
Written for
Vrije Universiteit Amsterdam (VU)
Bachelor Biomedical Sciences
Microbiology and Toxicology
All documents for this subject (28)
Seller
Follow
biomedicalsciencesvu
Reviews received
Content preview
Microbiology Chapter 5 – Microbial growth control
Microbial growth control;
We wash fresh produce to remove attached organisms and we inhibit microbial
growth on body surfaces by washing.
Microbial growth; exponential increase in biomass; a straight ascending line
Microbial elimination; exponential decrease in biomass; a straight descending line
Physical
Inhibiting microbial growth
• Decontamination; treatment of an object or surface to make it safe to handle
(wiping off food utensils to remove food fragments)
• Disinfection; process that directly targets pathogens although it may not
eliminate all microorganisms (requires agents, disinfectants, to kill
microorganisms or inhibit their growth)
Heat
Decrease the biomass, how higher the temperature how steeper the line.
Type of temperature is also important, moist heat has better power than
dry heat. Moist heat inhibits growth or kill cells more quickly.
Decimal reduction time (D); time required to reduce the number of
bacteria from 100% to 10%.
How many decimal reduction times are needed to achieve a 1% reduction is 2
Thermal death time; time it takes to kill all cells at a given temperature
Sterilization; 121 degrees, 15 min
Pasteurization; 71 degrees, 15 sec
• Advantage; taste changes less
• Drawback; not sterile; cells, bacterial spores survive. The bacterial spores are
very heat-resistant because of -low water content -Ca2+-dipicolinate
accumulation -special spore proteins.
• Originally used for wine and beer
Autoclave; is sealed heating device that uses steam
under pressure to kill microorganisms. Killing of
heat-resistant endospores require heating at
temperature above 100 degrees.
Autoclave places the steam which yield temperature
to 121 degrees.
Watch out; the temperature kills the microorganisms
NOT the steam.
Radiation
Decrease the biomass.
Microwaves; denaturation
UV; DNA fracture, DNA is destroyed and bacterial will die
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller biomedicalsciencesvu. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.20. You're not tied to anything after your purchase.
