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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Dear all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>A private company ask me the
following question:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>They have a polymer which is <span
class=SpellE>crosslinked</span> <span class=GramE>poly(</span>acrylic) acid .
This polymer is used for preparing gels for medical purposes. The degree of
swelling in water is important for them.<span style='mso-spacerun:yes'>
</span>They now ask me to determine the degree of swelling by analytical
ultracentrifugation. Is this possible? They refer to an article of Dr. H. Lange
in Colloid and Polymer science 264,488-493 <span class=GramE>( 1986</span>) :
Determination of the degree of swelling and <span class=SpellE>crosslinking</span>
of extremely small polymer gel quantities by analytical ultracentrifugation.
This is done with a Beckmann model E.<span style='mso-spacerun:yes'> </span>It
seems also a very complicated experiment. Is there not a <span class=GramE>more
easier</span> way to do this with the XLA?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Any help or suggestion is
welcome.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Thanks in advance,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:PersonName><font size=1 face=Arial><span lang=EN-GB
style='font-size:7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:
yes'>Aerts Tony</span></font></st1:PersonName><span lang=EN-GB
style='mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><st1:place><st1:PlaceType><font size=1 face=Arial><span
lang=EN-GB style='font-size:7.5pt;font-family:Arial;mso-ansi-language:EN-GB;
mso-no-proof:yes'>University</span></font></st1:PlaceType><font size=1
face=Arial><span lang=EN-GB style='font-size:7.5pt;font-family:Arial;
mso-ansi-language:EN-GB;mso-no-proof:yes'> of </span></font><st1:PlaceName><font
size=1 face=Arial><span lang=EN-GB style='font-size:7.5pt;font-family:Arial;
mso-ansi-language:EN-GB;mso-no-proof:yes'>Antwerp</span></font></st1:PlaceName></st1:place><span
lang=EN-GB style='mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>Campus Drie
Eiken Building T5.31</span></font><span lang=EN-GB style='mso-ansi-language:
EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>Department of
Biomedical Sciences</span></font><span lang=EN-GB style='mso-ansi-language:
EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>Laboratory of
Neurochemistry & Behaviour</span></font><span lang=EN-GB style='mso-ansi-language:
EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>Universiteitsplein
1</span></font><span lang=EN-GB style='mso-ansi-language:EN-GB;mso-no-proof:
yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>2610 Wilrijk</span></font><span
lang=EN-GB style='mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-GB style='font-size:
7.5pt;font-family:Arial;mso-ansi-language:EN-GB;mso-no-proof:yes'>email : </span></font><span
style='mso-no-proof:yes'><a href="mailto:tony.aerts@ua.ac.be"><font size=1
face=Arial><span lang=EN-GB style='font-size:7.5pt;font-family:Arial;
mso-ansi-language:EN-GB'>tony.aerts@ua.ac.be</span></font></a></span><span
lang=EN-GB style='mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial;mso-no-proof:yes'>Phone : 00 32 (0) 8202605</span></font><span
style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial;mso-no-proof:yes'>Fax: 00 32 (0)3 8202618</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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