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

What is hansen disease, What is Hansen's disease (etiological agent, mode o...

What is Hansen's disease (etiological agent, mode of transmission, clinical manifestations and prevention)? The etiological agent of Hansen's disease is bacteria known as Mycob

Sea, sea divisions

sea divisions

What is the life cycle of ascaris, Q. What is the life cycle of ascaris? ...

Q. What is the life cycle of ascaris? The Adult ascaris that live within the human intestine can release up to 200 thousand eggs a day. The eggs are eradicating with human fece

Acupunture-osteopathy-herbal therapy, Alternative Therapies Assignment 1...

Alternative Therapies Assignment 1. A. Acupunture, B.  Osteopathy, C.  Herbal therapy For each one of alternative therapies above, answers the three questions below! 1. Th

What is mendelian genetics, What is Mendelian Genetics? Mendelian Gene...

What is Mendelian Genetics? Mendelian Genetics :  In 1868, an Austrian monk, Gregor Mendel, first published the basics of a study we now call Mendelian genetics. Mendel obser

What are the general necessities for surgery, General necessities for surge...

General necessities for surgery The actual surgical technique of dental implant placement, it would be appropriate to recapitulate the basic principles of surgery. The two prin

Explain the peripheral resistance, Explain the Peripheral Resistance Re...

Explain the Peripheral Resistance Resistance offered by arterioles or resistance vessels, as you have read above, is termed as peripheral resistance. Changes in peripheral resi

Define glass photo-emissive tubes, Define Glass photo-emissive tubes? G...

Define Glass photo-emissive tubes? Glass photoemissive tubes are those which consist of a curved metal cathode, coated with a photosensitive material. While light strikes its s

Bantham and hookers classification systeam, discribe tha bantham and hooker...

discribe tha bantham and hookers systeam of classification

Etiological factor of malabsorption syndrome, Q. Etiological factor of mala...

Q. Etiological factor of malabsorption syndrome? The causes cited for malabsorption can be associated with a number of diseases. Many of these diseases you may not know presen

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