<DIV>Dear Justin,</DIV>
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<DIV>Thank you for your helpï¼I edited a parameter about HPO4 in force field 43a1 by myself as follows:</DIV>
<DIV>[ PO4 ]<BR> [ atoms ]<BR> P P 1.924 0<BR> O1 OM -1.127 0<BR> O2 OM -1.127 0<BR> O3 OM -1.127 0<BR> O4 OA -0.949 0<BR> H4 H 0.404 0<BR> [ bonds ]<BR> P O1 gb_13<BR> P O2 gb_13<BR> P O3 gb_13<BR> P O4 gb_27<BR> H4 O4 gb_1<BR> [ exclusions ]<BR>; ai aj<BR> O1 H4<BR> O2 H4<BR> O3 H4<BR> [ angles ]<BR>; ai aj ak gromos type<BR> O1 P O2 ga_28<BR> O1 P O3 ga_28<BR> O1 P O4 ga_13<BR> O2 P O3 ga_28<BR> O2 P O4 ga_13<BR> O3 P O4 ga_13<BR> P O4 H4 ga_11<BR> [ impropers ]<BR>; ai aj ak al gromos type<BR> [ dihedrals ]<BR>; ai aj ak al gromos type<BR></DIV>
<DIV>When I use mdrun,I found that there are some bonds O2-O3,why?And O1,O2,O3 are belong to OM。How to define the dihedral??</DIV>
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<DIV>xiaohong</DIV>
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<DIV><B>å‘件人:</B> "Justin Lemkul"<jalemkul@vt.edu>;</DIV>
<DIV><B>å‘é€æ—¶é—´:</B> 2012å¹´11月20æ—¥(星期二) 晚上8:30</DIV>
<DIV><B>收件人:</B> "Discussion list for GROMACS users"<gmx-users@gromacs.org>; <WBR></DIV>
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<DIV><B>主题:</B> Re: [gmx-users] About HPO4</DIV></DIV>
<DIV><BR></DIV><BR><BR>On 11/20/12 4:03 AM, 闪耀星空 wrote:<BR>> Hi,<BR>> HPO4 has dihedral or not?? If it has,which one?<BR>><BR>><BR><BR>There likely is a dihedral you need to use (since there are 4 atoms in O-P-O-H), <BR>but the second answer depends on which force field you are using. Without <BR>knowing that, no one can say.<BR><BR>-Justin<BR><BR>-- <BR>========================================<BR><BR>Justin A. Lemkul, Ph.D.<BR>Research Scientist<BR>Department of Biochemistry<BR>Virginia Tech<BR>Blacksburg, VA<BR>jalemkul[at]vt.edu | (540) 231-9080<BR>http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin<BR><BR>========================================<BR>-- <BR>gmx-users mailing list gmx-users@gromacs.org<BR>http://lists.gromacs.org/mailman/listinfo/gmx-users<BR>* Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting!<BR>* Please don't post (un)subscribe requests to the list. Use the <BR>www interface or send it to gmx-users-request@gromacs.org.<BR>* Can't post? Read http://www.gromacs.org/Support/Mailing_Lists<BR>
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