how would i measure bacteria growth in a petri dish?

@farmerman,

thank you! i will try to put it at a higher temp. but how would i do that?

@dadpad,

dadpad wrote:

Quote:
also i have left the dishes out on my kitchen counter but nothing has grown yet and it has been a whole three days!

Let grow in undisturbed warm location, ideally in an environment around 100° F (37° C) - not in sunlight or on a heating register.

There you hit the nail on the head. She needed an incubator of sorts.

0 Replies

@dadpad,

oh so sunlight is bad for it?

1 Reply

@ossobuco,

it sat in the cold!

0 Replies

@tsarstepan,

i already did and she doesn't know she suggested to go on here

0 Replies

@Rockhead,

yup but i can't see much because there is musture inside that's blocking my veiw!

0 Replies

@bacteriagirl97,

do you have a toaster oven?

1 Reply

@farmerman,

Toaster oven? Perfect bit of Yankee ingenuity and thinking!

0 Replies

I T'S GROWING!!! thank you all for your help! my dad helped me make an inkerbater by just putting the petri dishes in a shoe box and then just put a lamp on top of it! so because of the heat from the lamp the bacteria has grown!!!!! yay!

2 Replies

@bacteriagirl97,

YAY! You GROW Girl! Bacteria that is....

Sorry that was a tad obnoxious.... Confused

0 Replies

Arn't dads wonderful.

0 Replies

@bacteriagirl97,

bacteriagirl97 wrote:

oh so sunlight is bad for it?

Yeah, that would fit my own limited understanding.

0 Replies

@rosborne979,

That's true, rosborne, re expectation of results. Good catch. (One of our best finds was from a result that made no sense to us..)

0 Replies

@bacteriagirl97,

Yaaaaaaaay!
Good dad thinking..

0 Replies

@bacteriagirl97,

I recently did the same project, but i included the mouth of as cat, the reason nothing has grown is because it has to be in a warm and dark place, i found putting them in my closet the best spot, i started seeing colonies in about 2 days. Also make sure you have a piece of tape on each side to hold the lid on but still allowing a little air into it.

0 Replies

@bacteriagirl97,

Try using an inoculating loop and the streak method. This way, the spit will be evenly distributed among the agar. Also, make sure to use an incubator at around 98.6 (normal human body temperature) for the human spit and 102.5 (normal dog body temperature) for the dog spit to simulate the normal temperatures. This way, you have an optimal chance of growth. Good luck!

0 Replies

@bacteriagirl97,

The easiest way to measure bacterial growth is to put your sample on a clear glass plate under a microscope and count how many bacteria cells there are. Alternatively, you can measure turbidity, which is the amount of bacteria in your sample

0 Replies

how would i measure bacteria growth in a petri dish?

Related Topics

Quick Links

My Account

able2know