cellular membrane

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taata
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cellular membrane

Post by taata » Fri Jul 08, 2005 10:10 pm

How thick is a typical cellular membrane? Express in picometres (pm),
nanometres (nm), micrometres (μm) and millemetres (mm).

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victor
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Post by victor » Sat Jul 09, 2005 12:21 pm

I think it's less than 1 nm.
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Post by victor » Mon Jul 11, 2005 11:43 am

Hey...correction please..afeter reading my new book at last I got the answer...
there's differences between gram+ and gram- in the thickess of the membrane.
gram+
Cytoplasmic membrane: ~8 nm
Peptidoglycane: 15-80 nm
Variable outer membrane: ~8 nm

while for the gram-
Cytoplasmic membrane: ~8 nm
Peptidoglycane: 2 nm
Variable outer membrane: ~8 nm

That's what I got..hope this helps..
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Post by MrMistery » Sat Jul 16, 2005 7:36 pm

Lolza... you where right the first time. You see, the difference between Gram+ and Gram- bacteria is not in the thickness of the cell membrane, but in the thikness of the cell wall(peptidoglycan)
So, by your numbers, cause i do not know exactly, it is 8 nm
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Post by Waters2 » Sun Jul 17, 2005 12:52 am

Nanometer just be right in expressing in the cell membrane because for the picometer is too small for cells and it only right for the particles and sub-particles such as atoms, protons and others.

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Post by Waters2 » Sun Jul 17, 2005 12:55 am

victor wrote:there's differences between gram+ and gram- in the thickess of the membrane.
gram+
Cytoplasmic membrane: ~8 nm
Peptidoglycane: 15-80 nm
Variable outer membrane: ~8 nm

while for the gram-
Cytoplasmic membrane: ~8 nm
Peptidoglycane: 2 nm
Variable outer membrane: ~8 nm

Actually how to differential between the gram+ and gram- ?

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Post by Poison » Sun Jul 17, 2005 7:05 pm

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Post by chemistry_freako » Mon Jul 18, 2005 1:34 am

Dun quite get u also, but well, thought to differentiate between Gram + and -, the easiest way would be to carry out Gram staining? Gram nagative bacteria are unable to retain the dye and thus appear pinkish under the microscope whereas gram + bacteria which are able to retain the dye, appear purpleish under the microscope =D
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Post by victor » Mon Jul 18, 2005 11:55 am

Waters2 wrote:Nanometer just be right in expressing in the cell membrane because for the picometer is too small for cells and it only right for the particles and sub-particles such as atoms, protons and others.


Ummm...how about expressing it in femtometre???...(10e -15) :lol:
Perhaps gram+ can show 'color' when it's dyed because of thicker peptidoglycans I think... :?
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Post by Jelanen » Mon Jul 18, 2005 2:15 pm

Its more because the peptidoglycans are exposed on the surface of gram+ bacteria while gram- have another phospholipid bilayer over the peptidoglycans. Since the gram stain interacts with the peptidoglycans, the gram+ stain darkly while the gram- don't.
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Cell membrane ???

Post by ginny » Mon Jul 18, 2005 10:55 pm

the cell membrane is about 8 nm thick. :D did that answer your question . well keep in touch if you need any more help alright byeeeeeeeeee.
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Post by Waters2 » Fri Jul 22, 2005 10:45 pm

Sorry, actually i want to ask what is the gram+ and gram-? What is to function beside dying the bacteria?? :?

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