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

Preliminary screening stage of battery, Preliminary screening stage of batt...

Preliminary screening stage of battery During the preliminary screening stage in the development of the battery, items in the original pool that did not attain satisfactory int

Define nutritional requirements for young and older children, Define Nutrit...

Define Nutritional requirements for Young and Older Children? Young children need 3 en%, which would be easily met from 8-10 g of oil. However, more visible oil is needed to im

What are the endocrine functions of the placenta, Q. What are the endocrine...

Q. What are the endocrine functions of the placenta? The placenta has endocrine function since it secretes the hormones estrogen and progesterone that maintain the endometrium

Unified cell theory, Unified Cell Theory The present unified cell theo...

Unified Cell Theory The present unified cell theory states that All living things are composed of either a single Cell or of the cells and cell products. The cell is a m

Sticky sweet method-endodontics principles, Sticky sweet method Richwi...

Sticky sweet method Richwil crown and bridge remover -It is a resin block of water-soluble , like a stick sweet -It is first softened in hot water -Placed on the restorat

Which kind of polarity do water-soluble have, Which kind of polarity do wat...

Which kind of polarity do water-soluble and fat-soluble substances respectively have? Water-soluble substances are polar molecules, i.e., they have electrically charged areas.

How can germs can be transmitted, How can germs can be transmitted Germ...

How can germs can be transmitted Germs can be transmitted many ways, including: Touching dirty hands; Changing dirty or contaminated cloths; Through contaminated water and f

Blood pressure, bloodpressure will be more in _ in than in_

bloodpressure will be more in _ in than in_

Human impact on environment, questions and answers on human impacts on envi...

questions and answers on human impacts on environment

Define diagnostic criteria for anorexia nervosa, Define Diagnostic Criteria...

Define Diagnostic Criteria for Anorexia Nervosa? Table gives the American Psychiatric Association diagnostic criteria for anorexia nervosa. Although the manual does not use bod

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