Explain the physical methods to control microorganisms, Biology

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).

Posted Date: 6/6/2013 3:08:24 AM | Location : United States

Related Discussions:- Explain the physical methods to control microorganisms, Assignment Help, Ask Question on Explain the physical methods to control microorganisms, Get Answer, Expert's Help, Explain the physical methods to control microorganisms Discussions

Write discussion on Explain the physical methods to control microorganisms
Your posts are moderated
Related Questions
what are vhrmful effects of protozoans

how is the problem of chromosome shortening addressed in eukaryotic organisms and how aging might be related to the problem

Fruits Diabetics should have fruits every day. Be careful to select fruits and fruit juices, citrus fruits, such as oranges, grapefruit should be included. Tell them to eat fru

Define Blank Titration for Saponification Number of Fats? Pipette 5 ml of alcoholic KOH in a 250 ml conical flask. Titrate against standardized HCI using phenolphtalein as an i

Branemark's Theory of Osseointegration In 1952, Swedish orthopedic surgeon, Branemark, conducted microscopic studies done in situ of the bone marrow in rabbit's fibula with in

what carbohydrates does a plant make from glucose

Explain the Queens College Step Test? This test can be administered to large groups or those who are incapable of doing a test up till exhaustion. For this test, a bench (41 c

Q. Why we use Overgloves? Overgloves are used when: supplies or equipment are retrieved or returned to the Dispensary or from the unit mobile the operator is charting

Q. Explain nutrient requirements during hypertension? In order to meet the above objectives, we need to understand the nutrient requirements during hypertension. Let us start w

Types of Organization Chart: There are  two important  types of organization chart.  a)  Vertical i.e.,  from top to bottom.  b)  Horizontal  i.e., from  left to right.