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    On 9/02/2011 7:47 PM, lina zhao wrote:
    <blockquote
      cite="mid:AANLkTikhwRxrx4EKrYfqXaH5QoLHQgF6WinOk4Q+J=Rb@mail.gmail.com"
      type="cite"><br>
      Hi, it works<br>
      <br>
      before I thought it might share some similarity with 4.0.7 which
      some bash file helps to update the ff information.<br>
    </blockquote>
    <br>
    The mechanism changed in 4.5. Now "forcefield.*" files do something
    significant. Look at the contents and see.<br>
    <br>
    Mark<br>
    <br>
    <blockquote
      cite="mid:AANLkTikhwRxrx4EKrYfqXaH5QoLHQgF6WinOk4Q+J=Rb@mail.gmail.com"
      type="cite">Thanks,<br>
      <br>
      lina<br>
      <br>
      <br>
      <br>
      <br>
      <div class="gmail_quote">On Wed, Feb 9, 2011 at 4:02 PM, David van
        der Spoel <span dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:spoel@xray.bmc.uu.se">spoel@xray.bmc.uu.se</a>&gt;</span>
        wrote:<br>
        <blockquote class="gmail_quote" style="border-left: 1px solid
          rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
          1ex;">
          <div>
            <div class="h5">On 2011-02-09 08.56, lina zhao wrote:<br>
              <blockquote class="gmail_quote" style="border-left: 1px
                solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex;
                padding-left: 1ex;">
                Hi,<br>
                <br>
                Anyone has successfully tried to add some new force
                field in the default<br>
                force field (in 4.5)<br>
                <br>
                so pdb2gmx can show up the (newly-added) force field
                which will also be<br>
                recognized by gromacs,<br>
                <br>
                Thanks,<br>
                <br>
                lina<br>
                <br>
              </blockquote>
            </div>
          </div>
          Yes it's easy technically.<br>
          Just copy e.g. oplsaa.ff to new.ff and edit the files in that
          directory (not easy).<br>
          <br>
          -- <br>
          David van der Spoel, Ph.D., Professor of Biology<br>
          Dept. of Cell &amp; Molec. Biol., Uppsala University.<br>
          Box 596, 75124 Uppsala, Sweden. Phone: &nbsp;+46184714205.<br>
          <a moz-do-not-send="true" href="mailto:spoel@xray.bmc.uu.se"
            target="_blank">spoel@xray.bmc.uu.se</a> &nbsp; &nbsp;<a
            moz-do-not-send="true" href="http://folding.bmc.uu.se"
            target="_blank">http://folding.bmc.uu.se</a><br>
          <font color="#888888">
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          </font></blockquote>
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