100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Class notes microbiology ISE Prescott's Microbiology chapter 8 $10.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. Microbiology
  4.  
  5. Microbiology

Class notes

Class notes microbiology ISE Prescott's Microbiology chapter 8

 0 purchase
  • Course
  • Microbiology
  • Institution
  • Microbiology

This is chapter 8 -Control of Microorganisms in the Environment detailed notes. If you want to skip reading the entire chapter in the textbook and just memorize the necessary information for the chapter, consider purchasing this study guide!

Preview 2 out of 8  pages

Document information

  • November 4, 2024
  • 8
  • 2024/2025
  • Class notes
  • Saima cheema
  • Chapter 8 - controls of microorganisms in the environment

Subjects

  • detailed microbiology notes
  • microbiology exam 2 chapter 8 detailed notes

Connected book

book image

Book Title:

Author(s):

  • Edition:
  • ISBN:
  • Edition:

More summaries for

All for this textbook (43)

Written for

  • Microbiology
  • Microbiology

Seller

avatar-seller
tasmiiis06

Content preview

Microbiology
Chapter 8 - Control of Microorganisms in the Environment



8.1 : Microbial Growth and Replication: Targets for Control




Biocide: All antimicrobial agents that can be used to control microorganisms.


Controlling Microorganisms


* Physical, Chemical, and mechanical methods to destroy or reduce undesirable mi-
crobes in a given area. (Decontamination)
* Primary targets are microorganisms capable of causing infection or spoilage.

Highest Resistance
- Prions and bacterial endospores

Moderate Resistance
- Mycobacteria tuberculosis
- Enterococcus faecallis
- Pseudomonas Aeruginosa
- Stappylococcus aureus
* Resistance shared on plasmids

Least Resistance
- Most bacterial vegetative cells
- Fungal spores and hyphae yeast
- Enveloped viruses
- Protozoan trophozoites


Terminology and Methods of Control


For Animate Objects:

Antisepsis: destruction or inhibition of microorganisms on living tissue. (Prevention
of infection of living tissue by microorganisms or sepsis)

, Antiseptics: Chemical agents applied to tissue to prevent infection by killing or in-
hibiting pathogen growth ; they also reduce the total microbial population.
* Antiseptics are not as toxic as disinfectants because they can’t cause too much
harm to the host.

Chemotherapy: Application of chemicals to kill or inhibit the growth of microorgan-
isms.
* Chemotherapeutic agents are often characterized by the outcome of their applica-
tion.

- A disinfectant or antiseptic can be particularly effective against a specific group
and may be called bactericide, fungicide, or viricide.

- Some chemicals do not kill, but prevent further growth. If chemicals are removed,
growth will resume. This is called Bacteriostatic / Fungistatic.



The Pattern of Microbial Death Mirrors the Pattern of Microbial
Growth


- One measure of an agent’s killing efficiency is the Decimal Reduction Time (D)
/ D Value: this time is required to kill 90% of the microorganisms or endospores
in a sample under specified conditions.
(I.e): in a semilogarithmic plot of the population remaining vs. the time of heating,
the D value is the time required for the line to drop by one log cycle or 10-fold.




* To study the effectiveness of a lethal agent, one must be able to decide when a
microorganisms are dead which may present some challenges.
* Microbial cells are defined as dead if they don’t grow when inoculated into culture
medium that would normally support it’s growth. Similarly, an inactive virus can-
not infect a suitable host.



8.2: Microbes Can Be Controlled By Physical Means


Filtration: Excellent way to reduce the microbial population in solutions of heat
sensitive materials and can be used to sterilize liquids and gases (including air).

* There are two types of liquid filtration systems.

1) Depth Filters: Consist of fibrous or granular materials that have been bonded
into a thick layer filled with narrow twisting channels.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 tasmiiis06. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $10.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$10.49
  • (0)
Add to cart
Added