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

Patterns & Mechanisms of Evolution, What types of individuals in a populati...

What types of individuals in a population are represented by the two ends of a bell curve?

Gametes, examples of gametes

examples of gametes

Describe the features common in ventricular outflow, Describe the Features ...

Describe the Features common in ventricular outflow obstruction ? An ejection systolic murmur (ESM) due turbulent flow of blood through the obstruction. Hypertrophy of the cham

Explain about the reproduction in fungi, Explain about the Reproduction in ...

Explain about the Reproduction in Fungi? Fungi, we have seen above, reproduce both sexually and asexually. Asexual mode of reproduction include budding, binary fission and more

Cost-benefit relationship regarding sewage treatment, Q. What is the cost-b...

Q. What is the cost-benefit relationship regarding sewage treatment as a strategy to fight water pollution? To treat sewage is greatly cheaper for society. The non-treated sewa

Why is diabetes known as impairment to the homeostasis, Describe normal reg...

Describe normal regulation of blood glucose via the pancreatic hormones. How is this altered with Diabetes? Why is Diabetes called an impairment to the homeostasis of glucose? What

Explain the kidney structure in human biology, Explain the Kidney Structure...

Explain the Kidney Structure in human biology? The body's two kidneys are located in the small of the back, one behind the stomach and one behind the liver. Each kidney is comp

Which are the phases of the menstrual cycle, Which are the phases of the me...

Which are the phases of the menstrual cycle? The menstrual cycle is separated into two main phases: the follicular (or menstrual) phase and the luteal (or secretory) phase.

Diet-peri operative problems, Diet :  Pre-operatively, patients are on low...

Diet :  Pre-operatively, patients are on low calorie, low fat diet. However in the immediate post-operative period, strict dieting is not advisable. They need good nutrition for p

Explain salient features of pulmonary tuberculosis, Salient Features of pul...

Salient Features of pulmonary tuberculosis The salient features tuberculosis include: Wasting of tissues Exhaustion Cough Expectoration, and Fever The acute p

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