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• Hydroxyl hydrogens from CA26 in P212121 .
• schematic presentation of hydroxyl hydrogens .

• 827 - How do I strip hydrogens from an X-PLOR PDB file ? .
• Use MOLEMAN; on output (option WRIT) the program will ask you if you want to keep hydrogens or not. ...

• Propane - Two Different Kinds of Hydrogens.
• The propane molecule contains two different kinds of hydrogens: .
• The methyl group's 6 primary (1o) hydrogens .
• The methylene group’s 2 secondary (2o) hydrogens.

• Proton NMR sees only hydrogens, and it registers them on the NMR spectrograph. ...
• If a molecule has three different types of hydrogens then there will be three peaks (hopefully separated enough to show up as distinct peaks). Put another way, those three peaks correspond to hydrogens in different environments. ...
• A series of examples will be given to drive home the idea of "different hydrogens" or "different chemical environments".
• METHANE- CH4 1 carbon attached to 4 equally spaced hydrogens .
• It should make sense that each of the hydrogens in methane is in the same chemical environment. ...
• Each hydrogen is attached to a carbon which in turn is attached to three other hydrogens. ...
• ETHANE- CH3-CH3 2 carbons attached one to the other, and to each carbon there are 3 hydrogens attached.
• Ethane molecules rotate about that single bond so fast that the three hydrogens on a methyl blur together into an equivalent group. But not only is an end hydrogen equivalent to the other two hydrogens in its methyl group, it is also equivalent to the three hydrogens in the other methyl group too. ...
• If you were in one of the methyl groups, and then you went over to the other, the "view" (chemical environment is the scientific term) would be the same; you'd feel the two hydrogens on the same carbon you were on, and you "feel" the other methyl group.
• PROPANE- CH3-CH2-CH3 A center carbon attached to 2 hydrogens and two carbons; the outer two carbons are attached to three hydrogens each.
• The second is the two hydrogens on the middle carbon. ...
• Note that there are six end methyl hydrogens and two middle hydrogens. ...
• On an NMR there would be two peaks, and the one corresponding to the end methyl hydrogens would have an area three times that of the area of the peak coming from the middle hydrogens (6:2 -> 3:1).
• The remaining hydrogens are all still identical chemical environments (though it is a different environment than the environment the methane hydrogens were in--that electronegative chlorine is going to push the peak downfield on an NMR--but that's getting ahead of ourselves. ...

• Date Prev Date Next Thread Prev Thread Next Prev by date: ccp4bb : Riding Hydrogens (Jason Yano) .
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• uk *** On Fri, 6 Sep 2002, Jason Yano wrote: > So I am unclear on on the requirements for adding the hydrogens on in > refinement. At what resolutions do they become justified? Why are they > lowering my R and R-free? 1) your protein actually has hydrogens, that is why adding hydrogens to the model brings it closer to reality, i. ... 2) as mentioned in your subject header, these are "riding hydrogens". ... the positions of the hydrogens themselves are not independently refined. ...
• ccp4bb : Riding Hydrogens .
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• --> Date Prev Date Next Thread Prev Thread Next Date Index Thread Index ccp4bb : Generating hydrogens.
• Subject: ccp4bb : Generating hydrogens .
• Does anyone know of a way in which these hydrogens can be generated? Alternatively does anyone know the name of the library used in HGEN, and can it be edited to include the hydrogens in water? Many thanks for any suggestions Lorna Perkins ============================ Lorna Perkins Biophysics Department School Of Biomolecular Sciences Liverpool John Moores University Byrom Street Liverpool L3 3AF Tel: (0151) 231 2370 E-Mail: BMSLPERK@xxxxxxxxxxx .
• Re: ccp4bb : Generating hydrogens .
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• ADL: hydrogens.
• I'm unclear on the best way to deal with hydrogens in autodock. Is it best to have a pdb file that includes the hydrogen atoms or is it better to strip them off and use a united atom? if the latter, then its not obvious how to I tell autodock to use united atoms, that is how does it differentiate between a cH2, Ch3 and plain old C in the file? a separate but related question is how to deal with the case where the pdb file lacks hydrogens. ... Alternatively, I could use some crude program to bolt on hydrogens in standard positions. ... and do I need to treat the ligand and protein differently with regard to hydrogens. finally is the quality of autodock's performance strongly dependent on whether I have a pdb file with hydrogens and without? in case my first question is unclear I'll try to explain with an example: the input file for autodock/autogrid specifies a set of leonard jones type potentials. ...

• --> Date Prev Date Next Thread Prev Thread Next Date Index Thread Index Re: ccp4bb : Riding Hydrogens.
• Subject: Re: ccp4bb : Riding Hydrogens .
• uk *** On Fri, 6 Sep 2002, Jason Yano wrote: > So I am unclear on on the requirements for adding the hydrogens on in > refinement. At what resolutions do they become justified? Why are they > lowering my R and R-free? 1) your protein actually has hydrogens, that is why adding hydrogens to the model brings it closer to reality, i. ... 2) as mentioned in your subject header, these are "riding hydrogens". ... the positions of the hydrogens themselves are not independently refined. ...
• ccp4bb : Riding Hydrogens .
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• Adding Polar Hydrogens to the Macromolecule.
• When modeling hydrogen bonds explicitly, it is necessary to add polar hydrogens to the macromolecule. ...
• Note that most modeling systems add polar hydrogens in a default orientation, typically assuming each new torsion angle is 0° or 180°. ... One option is to relax the hydrogens and perform a molecular mechanics minimization on the structure. ... This "intelligent" placement of movable polar hydrogens can be particularly important for tyrosines, serines and threonines.

• ADL: must add hydrogens to ligands?.
• Previous message: ADL: must add hydrogens to ligands? .
• One of the successful theoretical work with Autodock (Biochemistry 2004, 43, 14521-14528), and only polar hydrogens again. My own dockings with peptide ligands with Kollman charges assigned indicate that models with only polar hydrogens dock better. But is it due to forcefield optimization for ligands with polar hydrogens (and there is a mistake in the manual in this case) or the ligands with ALL hydrogens dock worse just because just have more rotational degrees of freedom? It would be great to know the Autodock developer's opinion on this question. ... The docking examples with 1hvr and 3pdb that comes with Autodock have only the polar hydrogens assigned for ligands. ... As indicated in the manual, hydrogens must be ybso> added to all atoms in the ligand to ensure the completeness their ybso> valences. ...
• Previous message: ADL: must add hydrogens to ligands? .

• Date Prev Date Next Chronological Thread Top Re: Generating Hydrogens in x-ray protein structure.
• Subject: Re: Generating Hydrogens in x-ray protein structure .
• >My boss has asked me to tell about different programs freely available on >the net and the criteria/algorithm that it uses to generate >hydrogens in an x-ray protein structure. ...
• Generating Hydrogens in x-ray protein structure .
• Prev by Date: Generating Hydrogens in x-ray protein structure .

• Molvis-list adding hydrogens to a pdb file.
• Previous message: Molvis-list adding hydrogens to a pdb file .
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• As much as I admire Deep View, for hydrogens it does not do an extensive search to locate the best position. ... org> Sent: Wednesday, January 19, 2005 12:02 PM Subject: Re: Molvis-list adding hydrogens to a pdb file > For example Deep View (Swiss PDB Viewer) http://www. ... org> Sent: Wednesday, January 19, 2005 11:37 AM Subject: Re: Molvis-list adding hydrogens to a pdb file > We did an extensive check on the accuracy of adding hydrogens. ... org> > Sent: Tuesday, January 18, 2005 9:53 PM > Subject: Molvis-list adding hydrogens to a pdb file > > > > > > There used to be a WHAT IF web interface in which a user could submit a > > PDB ID number and get back an "hadded. ... > > > > Is there any other free software or server which can add hydrogens to a > > PDB file? > > > > Jeff Cohlberg > > > > -- > > Jeffrey A. ...
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