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valign="top"><table width="545" border="0" cellspacing="0" cellpadding="0">   <tr>      <td class="bleu11j"><img src="../images/titres/matrice_orga_uk.gif" width="150" height="30"><br>       <br>       A common property of biominerals is the presence of an organic fraction,        called <b>organic matrix</b>, intimately bound to the skeletal structure.        This matrix is not an incorporation of coral tissue but a controlled secretion        of specific molecules.        <p>In invertebrate exoskeletons, two distinct organic fractions, one soluble          and one insoluble, are arbitrarily defined during their aqueous extraction.          To extract organic molecules from mineral, the mineral needs to be dissolved,          indicating a very close association between the crystals and the organic          molecules. In fact, following partial dissolution of a mollusc shell,          the organic matrix appears as a network surrounding the crystal and visible          to the interior of the crystal, suggesting its controlling action during          formation.</p>       <p><br>         At the CSM, studies were made on aspartic acid incorporation in tissue          proteins, followed by the appearance of labelled macromolecules in the          skeleton. Incorporation within the skeleton of radiolabelled aspartic          acid is made with organic molecules and not with CaCO<span class="indice">3</span>          as was shown by preliminary experiments carried out in the laboratory.</p>       <p>The work is at present oriented towards determining the origin of the          organic matrix components and the regulating factors.<br>       </p>       </td>   </tr> </table>  <table width="545" border="0" cellspacing="0" cellpadding="0">   <tr>      <td class="bleugris11" valign="middle" width="256" >&nbsp;</td>     <td align="right" class="bleugris11" valign="middle" width="289" ><img src="../images/ar_rapid.gif" width="12" height="12">        <a href="../csmuk/physiologie.php">Back </a></td>   </tr> </table> <br> 		</td>    </tr>  </table>      <table width="710" border="0" cellspacing="0" cellpadding="0" align="center">    <tr>       <td align="center"><img src="../images/ligne_noir_570.gif" width="570" height="1"></td>    </tr>    <tr>       <td align="center" class="commentairesgris9">Last update: 03 24 2003<br>        Webmaster : <a class="lien" href="mailto:mbelfiore@wanadoo.fr">Myriam Belfiore</a><br>        Coordination : <a class="lien" href="mailto:etambutte@centrescientifique.mc">Eric         Tambutt&eacute;</a><br>        <br>        Photo Credits : The Monaco Scientific Center<br>        &copy; 2002 The Monaco Scientific Center</td>    </tr>  </table>  </body> </html> 
