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What is a petri?

A Petri dish is a shallow glass or plastic cylindrical lidded dish that biologists use to culture cells. It was named after German bacteriologist Julius Richard Petri, who invented it when working as an assistant to Robert Koch. Glass Petri dishes can be re-used by sterilization (for example, dry heating in a hot air oven at 160 °C for one hour); plastic Petri dishes must be disposed of after one use.


Why must it be sterilised before being used in compost?

It doesn't have to be sterilised but it helps. Sterilisation rids the compost of most disease spores and weed seeds and so gives new seedlings a head start.


When did Robert Koch find pathogen?

Robert Koch is associated with Koch's postulates, which must be satisfied before it can be accepted that particular bacteria cause particular diseases. He was first published in 1876. He did his first work with Anthrax. Later he developed methods using media like potatoes and later with Petri used what is still being used to grow bacteria, Petri dishes.


What a foodservice employee must do before unloading dishes from diswasher?

Wash his hands


What is the adverb in the sentence You must wash the dishes now?

Now is the adverb in that sentence. It tells when the dishes must be washed.


Dishes to try out in cuddle cafe?

cold coffee , mojito


What are the must-try dishes at the Fukuoka food stalls?

Some must-try dishes at Fukuoka food stalls include Hakata ramen, mentaiko (spicy cod roe) dishes, and motsunabe (offal hot pot).


What are some must-try dishes in Charleston cuisine?

Some must-try dishes in Charleston cuisine include shrimp and grits, she-crab soup, and low country boil.


Why must satellite dishes face a certain direction?

DISH Network satellite dishes must face a certain direction in order to allow the dish to correctly align with the necessary satellite orbitals.


What are some must-try dishes at a traditional Japanese restaurant in Japan?

Some must-try dishes at a traditional Japanese restaurant in Japan include sushi, sashimi, tempura, ramen, and tonkatsu.


How do you grow bacteria using a petri dish?

To grow bacteria on a petri dish, you will need several items.First you will need a petri dish with lid. The petri dish must contain agar, which is the source of the nutrients for the bacteria you want to grow.Then you will need sterile cotton tipped applicators. They must be sterile so that the bacteria you put in your dish is the only bacteria there, and not extra from an exposed cotton swab. There are also other laboratory tools that can be sterilized to pick up bacteria with.Then you need your source of bacteria.When you know what type of surface you will be swabbing, isolate one area, and swab it thoroughly with the cotton tipped applicator. Then, immediately swab it gently onto the agar surface with a back and forth motion.If testing two different specimens with one petri dish, be sure to only swab half of each side with each specimen. On the bottom of the dish, use a marker to note which side contains which sample.After preparing your petri dishes, place the lid on them and be sure they are labeled for easy identification. Then your specimens need to be incubated. Different types of bacteria thrive better at different levels of incubation and time. See a laboratory manual for incubation times.


What is the moral lesson of why woman wash the dishes?

The moral lesson of why the woman wash the dishes is because she doesn't want bugs to infest the house. Dishes must be washed in order to be used again.