Define plate counts and colony forming unit, Biology

Assignment Help:

Define Plate Counts and Colony Forming Unit?

Plate counts is the most frequently used method to measure microbial numbers. The technique, however, can be used only for those microorganisms, which are able to grow and reproduce on microbial media. Here a diluted sample of microbes is dispersed over suitable nutrient agar medium. There are two ways of performing a plate count - the spread plate and pour plate technique about which we have already studied in the last practical. Look up these techniques once again. Each microorganism then produces a distinct colony. Original number of viable microorganism in a sample is then calculated from the number of colonies formed and the sample dilution used. The results are reported in form of colony forming units (CFU) per ml of the sample.

Colony forming unit/ml can be expressed as:

CFU/ml = (No. of colonies formed * dilution factor) / Volume Sampled


Related Discussions:- Define plate counts and colony forming unit

How is the gymnosperm seeds formed, Q. How is the gymnosperm seeds formed? ...

Q. How is the gymnosperm seeds formed? What are the ploidies of the structures that compose the seeds? Their seeds are produced from differentiation of the megasporangia in the

Criteria of essentiality, Criteria of Essentiality Amon and Stout as e...

Criteria of Essentiality Amon and Stout as early as 1939, suggested certain criteria that an element must fulfil in order to be classified as essential. These criteria are lis

What are heterochromatin and euchromatin, What are heterochromatin and euch...

What are heterochromatin and euchromatin? Chromatin is uncondensed nuclear DNA, the typical DNA morphology in interphase (the phase of the cell cycle in which the cells is not

Define ergogenic and for training and competition, Define Ergogenic and for...

Define Ergogenic and for training and competition? There is always our desire to work with the body more .than its capability. This is more so in case of athletes. They wish to

Glomerular filtrate in comparison to the blood, Q. What is the major transf...

Q. What is the major transformation presented by the glomerular filtrate in comparison to the blood? Glomerular filtrate is the name given to the plasma after it has entered th

What are the constituent elements of the blood, What are the constituent el...

What are the constituent elements of the blood? The blood is made of a liquid and a cellular part. The fluid part is known as plasma and in it there are several substances, suc

Historical development of psychiatric nursing, HISTORICAL DEVELOPMENT OF PS...

HISTORICAL DEVELOPMENT OF PSYCHIATRIC NURSING: History is a  record of opportunities, recognized and informed,  that produce profound changes in a given field. History of psyc

How many different types of pseudopods can amoebas have?, Tests of shelled ...

Tests of shelled amoebas are made from a variety of substances including sand grains, chitin and substrate, calcium salts, and even silica. These shells still accumulate in ocean d

Explain deet, DEET DEET is available in the US in many formulations wi...

DEET DEET is available in the US in many formulations with concentrations of 5%-40% and 100%; higher concentrations present complete protection for a longer period of time, bu

Describe the ideal primary stability, Less than ideal Primary Stability ...

Less than ideal Primary Stability Faulty osteotomy (a bigger osteotomy than required for the selected diameter of implant) can result when excessive force is used to disengage

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