Talk:Cell membrane
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Contents |
[edit] Lipids
"In fact, not all lipid molecules in the cell membrane are "fluid," in the sense of free to diffuse. Lipid rafts and caveolae are examples of more-cohesive membrane regions." This statement is incorrect about the structure of lipid rafts Rvlaw
- I edited the summary paragraph to correct this. --Michael 15:53, 9 November 2006 (UTC)
[edit] Structure
Some cell membranes are lipid mono-layers, not bilayers (they have the lipid tails joined), see any microbiology textbook for a reference.
[edit] Caveolae
Can someone well-versed on this topic incorporate Caveolae into this article? Kingturtle 00:08 May 14, 2003 (UTC)
No I can't help you out, Kingturtle...I'm sorry. If you are a teacher, I strongly recommend this site to your students. I am a high schooler in biology and have found this site very helpful in looking up words and information. Plus, it's free!! I strongly recommend it! Happy exploring with Wikipedia!!!!
- I think it's worth having a separate article; research in the field is ongoing and the caveolae article could potentially expand considerably. It should be linked from here, though; it it? I'll check. --Chinasaur 00:39, 8 Sep 2004 (UTC)
No No No --originally unsigned comment by User:71.33.221.123.
[edit] Transport
I can't do it right now, but someone should add a section to this article about: 1) junctions between the cell membrane (i.e. desmosomes, tight junctions, hemidesmosomes, etc.) 2) all three transports (right now there are only two - all three are simple, facilitated, and active).
- I also can't do it right now, but someone should add a section on apical and basolateral membrane, and redirects too. --Eleassar777 14:34, 24 May 2005 (UTC)
[edit] Artificial outer membranes
I added today an article about polymersomes and checked out the liposome article. Both are currently stubs. I don't have the expertise required to write about them beyond what I already wrote (and that's not much and probably lacking in various aspects) but it would be nice if someone qualified could write them.
Link to this article should be added as well, as should links to them be added to this article. I'd also be very pleased if someone could start an article about artificial cells. --Khokkanen 10:34, 12 July 2005 (UTC)
[edit] Chunk of text from Gary123
1. The structure of the lipid bilayer explains its function as a barrier. Lipids are fats, like oil, that are insoluble in water. There are two important regions of a lipid that provide the structure of the lipid bilayer: the hydrophilic region, also called a polar head region, and the hydrophobic, or nonpolar tail region. The hydrophilic region is attracted to aqueous water conditions while the hydrophobic region is repelled from such conditions. Since a lipid molecule contains regions that are both polar and nonpolar, they are called amphipathic molecules. A single layer of phospholipids would not have this antagonism confklcit and thus be nmorre stable. 2. An experiment is designed to study the mechanism of sucrose uptake by plant cells. Cells are immersed in a sucrose solution, and the pH of the solution is monitored with a pH meter. Samples of the cells are taken at intervals, and the sucrose in the sampled cells is measured. The measurements show that sucrose uptake by the cells correlates with a rise in the pH of the surrounding solution. The magnitude of the pH change is proportional to the starting concentration of sucrose in the extracellular solution. A metabolic poison known to block the ability of cells to regenerate ATP is found to inhibit the pH changes in the extracellular solution. Propose a hypothesis accounting for these results. Suggest an additional experiment to test your hypothesis.
The change in pH is an indicator of how much sucrose is taken in by cells. The more the pH changes, the more sucrose was taken in. The metabolic poison which blocks the production of ATP stops the pH change; therefore the poison stops the intake of sucrose. Therefore, the intake of sucrose must require ATP. Therefore, there are two possible ways sucrose enters cells: Active Transport and Endocytosis, since both require energy. However, since we are talking about plant cells here, it can’t be endocytosis, since plants cells have wall that prevent them from doing this. Therefore sucrose must enter a plant cell by active transport.
3. Initally yhrtr is a direct relationship between sucrise concentration and rate of sucrose uptake. However when sucrose concentration reachers around 20 mM the shape of the curve begins to flatten. --Gary123 02:59, 11 October 2005 (UTC)
[edit] Molecular organisation of Cell membrane
Hi everybody...Could anyone just start a topic on the Molecular Organisation of cell membrane??????
[edit] Merge
I think the marge is not a good idea as not all semi-permeable membranes are cell membranes. The articles should remain separate. pschemp | talk 14:58, 9 July 2006 (UTC)
- I didn't propose that all of the article be incorporated into the cell membrane article only the bits that relate to cell membranes. Journeyman 00:55, 10 July 2006 (UTC)
