Define the utilization of most probable number techniques, Biology

Assignment Help:

Define the Utilization of Most Probable Number Techniques?

The MPN technique (multiple tube technique) can be used to determine the presumptive coliform count in the food. The sample is homogenized adequately and decimally diluted in saline solution or peptone water. Measured portion (e.g. 1 ml) of the solution and dilutions is transferred into multiple tubes (3 or 5) of selective and differential medium e.g. LST and incubated at 35°C for 48 hours.

Production of gas in inverted Durham tube by lactose fermentation indicates coliforms. By using standard MPN tables, as given herewith, MPN/ml or MPN/g of food samples is derived from number of positive tubes at 3 successive dilutions.The method was given by Mc Crady in 1915 and is statistically based. Three tubes or five tubes method can be used by inoculating 3 serial dilution of the sample into 9 or 15 tubes of appropriate medium respectively. The number of organisms in the original sample is determined by using standard MPN table as we have already studied in the last practical.


Related Discussions:- Define the utilization of most probable number techniques

Protozoa, advantages and disadvantages of protozoa

advantages and disadvantages of protozoa

Digitalis toxicity, Symptoms of digitalis toxicity include anorexia, nausea...

Symptoms of digitalis toxicity include anorexia, nausea, headache, blurring or yellowing of vision, and disorientation. Cardiac toxicity may take the form of atrioventricular condu

Tracheae - respiratory organs, Tracheae - Respiratory Organs Tracheal ...

Tracheae - Respiratory Organs Tracheal respiration is characteristic of insects. Onychophorans, diplopods, arachnids, and chilopods as well use tracheal system for respiration

Microscopy, describe the importance,principles,techniques and uses of micro...

describe the importance,principles,techniques and uses of microscopy

Respiration by cutaneous respiration and diffusion, Q. What is the differen...

Q. What is the difference between respiration by cutaneous respiration and diffusion? Does blood participate in cutaneous respiration? Cutaneous respiration is not as simple as

Water to flow within the xylem from the roots to the leaves, What are the f...

What are the forces that facilitate to make water to flow within the xylem from the roots to the leaves? Water enters the roots because of the root pressure and a water column

Formation of chiasmata, Chiasmata formation takes place where crossing over...

Chiasmata formation takes place where crossing over occurs. Here Chromatid segments are exchanged which contributes to genetic variability. The 46 homologous chromosomes arrange at

Define nitrogen estimation - kjeldahl''s method, Define Nitrogen Estimation...

Define Nitrogen Estimation - Kjeldahl's Method? Nitrogen in the protein is estimated by a method referred to as Kjeldahl's method. Although over a period of time many other met

Explain polio, Explain Polio Adults who have not previously been immuni...

Explain Polio Adults who have not previously been immunized against polio should receive a primary series of inactivated polio vaccine (IPV) if traveling to areas where polio i

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