Explain the physical methods to control microorganisms, Biology

Assignment Help:

Explain the Physical Methods to Control Microorganisms?

The physical methods to control microorganisms involve heat, filtration or radiations. Figure illustrates these methods. Temperature influences microorganisms by altering their enzyme systems. Low temperature, you may recall studying in the theory Course, inactivates the enzymes while high temperature destroys them. Heat is commonly employed for controlling microorganisms. Both moist heat and dry heat can be used for this purpose. Moist heat results in coagulation of proteins and degrades nucleic acid and may even disrupt cell membrane.

 

269_Physical Methods to Control Microorganisms.png

Moist heat has more penetrability than dry heat and kills the cells more rapidly that too at a lower temperature. Microbes exhibit difference in their resistance to moist heat. Generally, bacterial spores require temperature above 100°C for destruction. Moist heat can either sterilize or disinfect the object depending upon the temperature employed. Moist heat can be used either

(1) at temperature <100° C (pasteurization-used to remove pathogens),

(2) as free flowing steam at 100° C (by boiling or tyndallisation) or

(3) by saturated steam under pressure (autoclaving).


Related Discussions:- Explain the physical methods to control microorganisms

How is l. monoctogenes infection transmitted, How is L. monoctogenes infect...

How is L. monoctogenes infection transmitted? Listriosis caused by Listeria monocytogenes infection. Transmitted by animal excretions (faecal matter) and secretions, infecte

Methods useful in self-incompatibility, Methods Useful in Self-Incompatibil...

Methods Useful in Self-Incompatibility More specific methods useful in overcoming self-incompatibility are mentioned below 1. Bud Pollination : In Petunia axillaris early

Usefulness of fungi for some industries, Q What is the usefulness of fungi ...

Q What is the usefulness of fungi for some industries? Fungi are industrially used in the production of fermented beverage, cheese, bread, and so on. A few fungi are very impor

Main effects of chronic lead, Q. Main effects of chronic lead? Lead, e...

Q. Main effects of chronic lead? Lead, even at relatively low levels of exposure can cause severe health effects. Exhaust from vehicles using unleaded petrol serves as

Explain the process of determination of vitamin C, Determination of vitamin...

Determination of vitamin c Majority of chemical methods of determination is based on the rapid oxidation of ascorbic acid and therefore not too highly specific. Titration of

Determine the extracellular concentration of tva, Determine the extracellul...

Determine the extracellular concentration of TVA Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectivel

Define ecosystems science and large-scale ecology, Define Ecosystems scienc...

Define Ecosystems science and large-scale ecology? Many of today's most pressing problems are regional or global in nature including for instance, the effects of land cover and

State the principles of behaviour change communication, Principles of behav...

Principles of behaviour change communication - BCC should be integrated with program goals from the starting. BCC is a necessary part of diabetes prevention, care and support p

Basic morphological features of echinoderms, Q. What are the basic morpholo...

Q. What are the basic morphological features of echinoderms? Echinoderms, as the name indicates (derma = skin, echino = spiny), are creatures with spines originated from an end

Population regulation, Population Regulation The number of individuals...

Population Regulation The number of individuals in a natural population varies with time. If the size of a population declines too drastically due to some reason, it may becom

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd