Nov 21, 2016· The reason agar is used to grow bacteria is because of its gel-like properties. It allows nutrients to be evenly suspended within it while being non-toxic …
The agar allows the bacteria to grow on the surface and form into characteristic masses called colonies. It can also be used for isolation and purification of organisms. State the purpose of the streak plate technique.
Mar 04, 2012· Bacteria need some sort of food source for it's growth. Agar is the standard growth medium for the culturing of bacteria. Agar is extracted from type of red algae and is a polysaccharides which is an ideal growth medium for these microorganisms.
Aug 17, 2008· In bacteriological media, agar and nutrients are added together and the specific nutrients are chosen for the particular type of bacteria you want to grow and for the conditions under which you want the bacteria to grow. Agar is used rather than gelatin because agar isn't broken down by most bacteria.
Agar is seaweed made of cellulose which bacteria cannot digest. differential media: produces color changes in response to differences in reactions by bacteria such as differences in fermentation of sugars; contains fermentable sugars or other differential agents.
Take samples around you and see what bacteria will grow in an agar-filled Petri dish. Take the lid off of the Petri dish (the lid is larger than the dish) and carefully cover the bottom-half of the Petri dish with warm nutrient agar mixture. Loosely cover the bottom portion (set the lid ajar so .
Apr 24, 2017· It contains many nutrients, and bacteria can thrive on it. It is gelatinous, and is created by mixing powdered agar with water and adding heat. This serves to sterilize the surface and makes it a thick liquid. After this liquid is poured into sterile Petri dishes, it solidifies into a gel and can be used as a medium for bacterial growth.
Jul 31, 2019· Students grow bacterial cultures on agar, which is a gel-like substance that give the bacteria nutrients and food they need to survive. Taking a few simple steps gives those microbes their best chance to grow on the agar, making the experiment more successful.