Define petri plates - food microbiology, Biology

Assignment Help:

Define Petri Plates - Food Microbiology?

Petri plates were discovered by Richard Petri in Ninteenth century (1887). It consists of two dishes. Look at the Figure which illustrates the two dishes and petri plate can.

138_Petri Plates.png

Figure: Petri plate and petri plate can

Bottom dishes (base) are smaller and carry 20-25 ml of the culture medium. Upper plate (cover) is bigger and provides a loose cover to bottom dish to avoid contamination. Petri plates are available in different sizes but for routine purpose, generally, plate of 9-10 cm diameter is used. Liquefied molten solid culture medium is poured into the bottom plate and is allowed to solidify. As petri plates provide larger surface area, these are useful for isolation and cultivation of microorganisms.: Storage and incubation of petri plates should be done in an inverted position to prevent dropping down of water droplets formed by condensation during solidification of media on to the surface of the hardened agar surface. This can spread the microorganisms on the agar surface, resulting in confluent growth instead of discrete colonies.


Related Discussions:- Define petri plates - food microbiology

Transgenic animals, T ra n sge n i c animals There are various d...

T ra n sge n i c animals There are various definitions for the term transgenic animal . The transgenic animal is an animal in which there has been a deliberate modifica

Low protein products, Foods with moderate amounts of protein can be eaten i...

Foods with moderate amounts of protein can be eaten in limited amounts. These foods include grains, bread, pasta, rice, potatoes, corn, and peas. Foods with little or no protein ar

What are epithelial tissues, What are epithelial tissues? What are their ge...

What are epithelial tissues? What are their general function and how is that function associated to the features of the tissue? Epithelial tissues, also known as epithelia, are

Describe new cardio-vascular risk factors, Describe New Cardio-vascular Ris...

Describe New Cardio-vascular Risk Factors ? The major risk factors contributing to the development of atherosclerotic plaques in blood vessels have been known for many years. H

Darwins theory of natural selection, Darwins theory of natural selection is...

Darwins theory of natural selection is considered a paradigm shift--a theory that has wide-ranging effects. Describe some of the advantages that this theory offered scientists once

What could have caused the discrepancy, If the class's value did not match ...

If the class's value did not match the expected value of water, let's assume everyone was actually correctly using the devices and there was no "user error." What could have caused

What are the symptoms causes of fever, During a fever in a human, A. sh...

During a fever in a human, A. shivering can happen when the actual body temperature is higher than the set point for body temperature during the fever. B. the control system

Define observation or inference for picric acid test, Define observation or...

Define observation or inference for picric acid test? 1. A mahogany red colour will be seen. The mahogany red colour indicates the presence of reducing sugar. All monosaccharid

How many g of h2so4 does contain, How many g of H2SO4 does  600 ml of a 1.2...

How many g of H2SO4 does  600 ml of a 1.2 M solution of H2SO4 contain? Please show all steps.

Explain food applications of curdlan, Food Applications of Curdlan Curd...

Food Applications of Curdlan Curdlan has a variety of food applications as enumerated herewith: a)  Meat and Poultry Curdlan makes meat and poultry products juicier and

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