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

Explain ledge bypass - non-surgical endodontic retreatment, Explain Ledge b...

Explain Ledge bypass - Non-surgical Endodontic Retreatment   Ledge bypass - StSt not NiT cause it has shape memory Ledges from outside the curvatures. The file t

Why should posterior wall preffered during surgery, Why should Posterior wa...

Why should Posterior wall preffered during surgery Posterior wall should not be perforated during surgery. This limits bleeding from the pterygoid plexus or branches of the max

Define about the calcium - macro minerals, Define about the Calcium - Macro...

Define about the Calcium - Macro minerals? Among minerals, calcium (Ca) is the most abundantly present in humans, representing 52% of the body's mineral content and amounting t

Determine the concepts of soil fertility, Determine the Concepts of Soil Fe...

Determine the Concepts of Soil Fertility  The soil fertility evaluation can be assessed by having an idea of the amount of nutrient which will be required for the growth of pla

Chlorophyll and haemoglobin, dialouge on cartoon between chlorophyll and ha...

dialouge on cartoon between chlorophyll and haemoglobin

What is optic nerve, What is optic nerve The optic nerve contains more...

What is optic nerve The optic nerve contains more than one million axons that initiate in the ganglion cell layer of the retina. This structure originatcs at the back of the e

Planning and implementation of nursing care-aplastic anaemia, Planning of N...

Planning of Nursing Care     Administer the drugs as prescribed -    Prevent infection    Control bleeding  Implementation of Nursing Care   Administer th

What is the normal duration of the menstrual cycle, What is the normal dura...

What is the normal duration of the menstrual cycle? How does the calendar contraceptive method work? The normal duration of the menstrual cycle is 28 days but it can vary betwe

X-linked dominant genes, X-Linked Dominant Genes Dominant X-linked gene...

X-Linked Dominant Genes Dominant X-linked genes are always expressed in both the sexes just as in autosomal traits. One dose of X-linked dominant allele produces its effects in

Briefly explain associated mitral regurgitation, Explain Associated Mitral ...

Explain Associated Mitral Regurgitation and their role in miscellaneous conditions? Normal 0 false false false EN-IN X-NONE X-NONE

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