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

Morphological nature of endosperm, Morphological Nature of Endosperm ...

Morphological Nature of Endosperm The morphological nature of endosperm in angiosperms has been a subject of much discussion in evolution. The endosperm in gymnosperms is a g

Circulation, Circulation, Respiration and Excretion of Asteroidea Aste...

Circulation, Respiration and Excretion of Asteroidea Asteroids depend upon the circulation of coelomic fluid for the transport of gases and some nutrients. The blood vascular

Explain major limiting factors of photosynthesis, Q. What are the three maj...

Q. What are the three major limiting factors of photosynthesis? The three major limiting factors of photosynthesis process are light intensity, carbon dioxide temperature and c

Explain zidovudine, Zidovudine Zidovudine is available alone and in fix...

Zidovudine Zidovudine is available alone and in fixed-dose combinations with lamivudine as Combivir and with lamivudine and abacavir as Trizivir. It can be given in combination

Salinity - marine ecosystems, Salinity - Marine Ecosystems Physico-...

Salinity - Marine Ecosystems Physico-chemical factors - Salinity The sea is salty and its salinity is fairly constant, averaging about 3.5 per cent usually written as

Growth phase -stages in spermatogenesis, Growth Phase -Stages in spermatoge...

Growth Phase -Stages in spermatogenesis Growth phase is characterized by the acquisition of the structural and functional characteristics of distinct sex cells. Also here is a

Diet for cardiac patients, Diet Continue diet as prescribed at hospita...

Diet Continue diet as prescribed at hospital. Some may continue fluid and salt restriction, some may have to restrict iron and Vitamin K rich food stuff. The patient needs t

Explain the composition of blood agar, Explain the Composition of Blood Aga...

Explain the Composition of Blood Agar? Infusion from beef heart - 500 gm Tryptose - 10.0 gm Sodium Chloride -  5.0 gm Agar - 15 gm Distilled water - 1000  ml pH

VIRUSES, WHAT IS THE TYPICAL REPRODUCTION CYCLE OF A DNA VIRUS

WHAT IS THE TYPICAL REPRODUCTION CYCLE OF A DNA VIRUS

What are the major organic molecules for living beings, Q. What are the maj...

Q. What are the major significant organic molecules for living beings? There are many types of organic molecules that are important for the living beings. Particularly importan

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