From julianthomasp from gmail.com  Tue Jan  1 11:20:25 2008
From: julianthomasp from gmail.com (j_thomas)
Date: Tue Jan  1 12:01:24 2008
Subject: [Biophysics] Lecture on Protein Ligand Modelling
Message-ID: <9da5ba1b-57b6-4fcb-b4ad-70aca5caf651@i12g2000prf.googlegroups.com>

Lecture on Protein Ligand Modelling

http://bioisolutions.blogspot.com/2007/12/protein-ligand-modelling.html

or

http://tinyurl.com/227kty


--
Sincerely,
Julian Thomas
http://bioisolutions.blogspot.com/
From tc208 from yahoo.co.uk  Wed Jan 23 17:37:10 2008
From: tc208 from yahoo.co.uk (Tom Chou)
Date: Wed Jan 23 18:10:25 2008
Subject: [Biophysics] chemical pinging mechanism?
Message-ID: <4797C196.1040902@yahoo.co.uk>


Dear all,

I am wondering if anyone knows any biological examples of the following 
mechanism, or something close to it:


A cell emits a chemical A that diffuses outward and comes in contact 
with another cell (or target). The target is then triggered to produce
another chemical B, that diffuses back to the cell that prodiced A. This 
cell then uses B as a chemoattractant/repellent to move towards or away 
from the target. Are there any examples of
such chemical pinging mechanisms in Nature? I think bacterial 
aggregation is different from what I have in mind.

Thank you,

Tom