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Gram Positive and Gram Negative


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5 replies to this topic

#1 Nicky135791

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Posted 28 January 2011 - 05:14 PM

Hello,
I am an 8th grader doing a science fair project and I would like to check up on my info, and find out more if possible. :rolleyes:
Now I am only 13 so I dont need to have deep details, but i need the basics on the difference between Gram Positive and Gram Negative.
Does macconkey agar grow Gram Positive and Gram Negative?
Please dont go into big details.

#2 Ameya P

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Posted 28 January 2011 - 09:28 PM

Hello,
I am an 8th grader doing a science fair project and I would like to check up on my info, and find out more if possible. :rolleyes:
Now I am only 13 so I dont need to have deep details, but i need the basics on the difference between Gram Positive and Gram Negative.
Does macconkey agar grow Gram Positive and Gram Negative?
Please dont go into big details.


Nicky,

MacConkey agar would not allow growth of most Gram positive bacteria. It is selective for Gram negative bacteria.

To grow Gram Positive bacteria you could use Mannitol salt agar (MSA). More about MSA can be found here

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#3 Nicky135791

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Posted 06 March 2011 - 12:22 PM

Thank you to anyone who has helped me :lol:
yesterday I went to the CARSEF (Central Alabama Regional Science and Engeneering Fair) and I got Honorable Mention in my catagory :)

#4 Ameya P

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Posted 06 March 2011 - 10:50 PM

Thank you to anyone who has helped me :lol:
yesterday I went to the CARSEF (Central Alabama Regional Science and Engeneering Fair) and I got Honorable Mention in my catagory :)


Nicky,

You should have me in your acknowledgements.... :P

Congrats, its all your hard work!!!!

Edited by gt_ameya, 06 March 2011 - 10:50 PM.

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#5 pito

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Posted 07 March 2011 - 04:45 AM

Thank you to anyone who has helped me :lol:
yesterday I went to the CARSEF (Central Alabama Regional Science and Engeneering Fair) and I got Honorable Mention in my catagory :)


And what were your conclusions ? That it didnt matter wich animalsaliva you used or?

If you don't know it, then ask it! Better to ask and look foolish to some than not ask and stay stupid.


#6 Phil Geis

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Posted 18 March 2011 - 03:39 PM

Hardly gt - you misled re. Mannitol salt agar. Staph will grow but many Gram positive bacteria will be inhibited by the high salt.




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