you`ll certainly need to give it plenty of time, also take into account that "Lime jelly" has preservatives in it that inhibit this type of activity

I`de give it at least a week as a fair trial, by then you`ll see something if your going to

what should he actually see when the bacteria grow properly? I did an experiment simimlar to this one using agar, and i saw white 'spots' of colonies of bacteria. IS that what he is supposed to see?

yup

white green blue black grey some are even red! it`ll apear as an inconsistency to the surface of the gel, and then gradualy become more profound over time. the neat thing with the fingerprint sample, you`ll actualy see the print after a while

Cool:) thanks for the advice

not a prob

 

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Ummmmm, I am not sure if i see signs of bacteria, I see a VERY VERY faint (could be anything) cloud.

I have added these nutrients to my gelatin:

Sugar

adipic acid

sodium citrate

fumaric acid

a tiny bit of salt

Could any of those be stopping the bacterium from growing????????? Are they way too acidic????

Help will be appreciated

how long have u incubated it?

it has been a day now, in the low 90 deg. F.

 

EDIT: And it has been 1 and 1/2 days, I still cease to notice any growth??

Can YT explain this?

I think there is only one culpret for this, and that is the culture medium.

Did i put in bad nutrients, as stated above

(I have added these nutrients to my gelatin:

Sugar

adipic acid

sodium citrate

fumaric acid

a tiny bit of salt)

Probably needs longer to be honest with you. I'd say that there's probably a number of factors involved in bacteria reproduction, and although I'm not a biologist, I'd probably give it a bit more time.

for my bacteria sample, we left them for about a week before seeing tiny spots!

Well you don't know what bacteria you're actually cultivating, and I'd think that some bacteria is slower to cultivate than others anyway.

must be. We got out bacteria from our hands!

hmmm, thanks for the reassurence that it will take longer, but still come

it should. The experiment that u specified looks fine.

YAHOOOOOOOOOOOOOOO

I see my first two dots! I think they are some colenies!!!!

(Pictures comming soon)

Ok, it turneed out tobe alittle more then 2 colonies, it seems i was not looking quite close enough

excellent!

what ever you do though, do NOT take the lid off! and always wash your hands afterwards with dillute chlorox bleach. don`t breathe any of it in! I`de like to see the results of your experiments for many years to come, not have you laid up in hospital somewhere!

excellent!

what ever you do though' date=' do NOT take[/quote']

is that just to keep the bacteria inside the container? or is there another reason?

Yes, I have come very prepared for that (as in safety). Are wearing rubber glooves, a docters mask (my dad is a docter, so i have plenty), goggles, and the frequent washing of hands enough? (w/ diluted bleach and anti-bacterial soap, bleach not to be mixed w/ ammonia )

 

PS, i think the otherr reason is SAFETY!!!

is that just to keep the bacteria inside the container? or is there another reason?

 

yeah, you really don`t want spores to enter your lungs, or other airborne spores to contaminate your dish either, mayny often have a bit of sellotape around the lid too, in case it gets dropped (accidents happen).

but basicly it keeps you and your sample safe

The air is filled with bacteria and spores - you also don't want those settling on your medium and changing your results.

Very true Sayonara³

It's very important to keep the petri lid on; especially since you don't know what bacteria you're actually cultivating - some of that stuff could be quite nasty if inhaled.

what effects could cultivating unknown bacteria cause? Serious illness? Damage to the body?

that`s just it, Unknown

but most are not pleasant!