<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Dear Mark<DIV>Hello.<DIV>The force field I used is g43b1 from GROMOS96. I checked the g43b1.atp file and fond that the HC is defined there which corresponds to Hydrogen attached to the Carbon. But somehow in the pdb outcome this is not there. the output pdb file contains only H atoms corresponding to HN. </DIV><DIV>Now I exactly don't know which type of atoms are defined there. Kindly let me know what should I do to bring HA into the scene. </DIV><DIV>Best regards</DIV><DIV>Nav</DIV><DIV><BR><DIV><DIV>On Aug 17, 2006, at 5:46 AM, Mark Abraham wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Navratna Vajpai wrote:</DIV> <BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Dear All I have been able to carry on with the MD run of my peptides. But when I converted the traj into the pdb file I realized that there are no HA atoms in the pdb. I checked the rtp file and found that even those atoms are not defined there. So can anyone tell me how to get the HA (after or before the MD run) as i need them explicitly . I was trying to look for the options available in the trjconv but could not find.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Thanks and regards</DIV> </BLOCKQUOTE><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Does your force field include explicit non-polar hydrogen atoms? Or does it use united atoms?</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Mark</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">gmx-users mailing list<SPAN class="Apple-converted-space"> </SPAN><A href="mailto:gmx-users@gromacs.org">gmx-users@gromacs.org</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="http://www.gromacs.org/mailman/listinfo/gmx-users">http://www.gromacs.org/mailman/listinfo/gmx-users</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Please don't post (un)subscribe requests to the list. 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