[RASMB] Urea diffusion and sedimentation coefficient

[Arthur Rowe]

Hi Dave

What a question!  Although when you think of it, one could imagine that
someone (with time on their hands) might 'in the old days' have measured the
free-boundary translational diffusion coefficient (though probably not the
s-value) of urea. 

One needs to bear in mind that urea can dimerise in solution, although with
what Kd I do not know - though someone out there probably does (see Allan J
Easteal - Can J Chem 68 1611-1615 (1990): Idrissi et al J Molec Liquids, 110
201-208 (2004)). The latter authors use molecular dynamics simulation to
compute a value of around 1.1 e-9 m^2 sec^-1 for the self-diffusion
coefficient of urea in water at 30º at 0.2 mole fraction - but this is of
little use really for answering your query.

Hope someone has  some more detailed ideas than these!

Arthur


--
*******************************************************
Arthur J Rowe
Professor of Biomolecular Technology
NCMH Business Centre
University of Nottingham
School of Biosciences
Sutton Bonington
Leicestershire LE12 5RD   UK

Tel:        +44 (0)115 951 6156
           +44 (0)116 271 4502
Fax:        +44 (0)115 951 6157
email:      arthur.rowe at nottingham.ac.uk
Web:        www.nottingham.ac.uk/ncmh/business
*******************************************************





Hello All
Does anyone have to hand the diffusion and sedimentation coefficient for
Urea?
cheers

dave.

Dr. David J. Scott
Lecturer in Physical Biochemistry
National Centre for Macromolecular Hydrodynamics
School of Biosciences
University of Nottingham
Sutton Bonington Campus
Sutton Bonington
Leicestershire
LE12 5RD
United Kingdom
dj.scott at nottingham.ac.uk
www.nottingham.ac.uk/ncmh
+44 (0) 115 951 6221 Phone
+44 (0) 115 951 6142 Fax

This message has been checked for viruses but the contents of an attachment
may still contain software viruses, which could damage your computer system:
you are advised to perform your own checks. Email communications with the
University of Nottingham may be monitored as permitted by UK legislation.

_______________________________________________
RASMB mailing list
RASMB at rasmb.bbri.org
http://rasmb.bbri.org/mailman/listinfo/rasmb


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.rasmb.org/pipermail/rasmb-rasmb.org/attachments/20070808/2a677997/attachment.htm>