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ChemOffice.Com - CambridgeSoft

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Administrator<br />

change a property. By changing some property of a<br />

lower level object, you can better visualize the part<br />

of the model you want to study.<br />

Use the Model Explorer to:<br />

• Define objects.<br />

• Add objects to groups.<br />

• Rename objects.<br />

• Delete objects, with or without their contents.<br />

The display properties of objects you can alter<br />

include:<br />

• Changing the display mode.<br />

• Showing or hiding.<br />

• Changing the color.<br />

At the atom level, you can display or hide:<br />

• Atom spheres<br />

• Atom dots<br />

• Element symbols<br />

• Serial numbers<br />

Model Explorer Objects<br />

The Model Explorer objects are:<br />

• Fragments<br />

• Chains<br />

• Groups<br />

• Atoms<br />

• Bonds<br />

• Solvents<br />

• Backbone<br />

The Fragment object represents the highest level<br />

segment (“parent”) of a model. Fragments<br />

represent separate parts of the model, that is, if you<br />

start at an atom in one fragment, you cannot trace<br />

through a series of bonds that connect to an atom<br />

in another fragment. If you create a bond between<br />

two such atoms, Chem3D will collapse the<br />

hierarchical structure to create one fragment.<br />

Fragment objects typically consist of chains and<br />

groups, but may also contain individual atoms and<br />

bonds.<br />

In Chem3D, chains and groups are functionally<br />

identical. Chains are special groups found in PDB<br />

files. If you rename a group as a chain, or vice versa,<br />

the icon will change. This is also the reason that<br />

only the work “Group” is used in the menus. All<br />

Group commands also apply to chains.<br />

Group objects can consist of other groups, atoms<br />

and bonds. Chem3D does not limit a group to<br />

contiguous atoms and bonds, though this is the<br />

logical definition.<br />

Bond objects do not appear by default in the Model<br />

Explorer. If you want to display bonds, select Show<br />

Bonds in the GUI tab of the Chem3D Preferences<br />

dialog box.<br />

The Solvent object is a special group containing all<br />

of the solvent molecules in the model. The<br />

individual molecules appear as “child” groups<br />

within the Solvent object. A Solvent object should<br />

not be child of any other object.<br />

NOTE: When importing PDB models, solvents will<br />

sometimes show up in chains. While this is incorrect,<br />

Chem3D preserves this structure in order to be able to save<br />

the PDB file again.<br />

The Backbone object is a display feature that allows<br />

you to show the carbon-nitrogen backbone<br />

structure of a protein. It appears in the Model<br />

Explorer as a separate object with no children. The<br />

atoms and bonds that make up the backbone<br />

belong to other chains and groups, but are also<br />

virtual children of the Backbone object. This allows<br />

you to select display properties for the backbone<br />

that override the display properties of the chains<br />

and groups above them in the hierarchy.<br />

To display the Model Explorer:<br />

• From the View menu choose Model Explorer.<br />

108•Inspecting Models<br />

<strong>CambridgeSoft</strong><br />

Working With the Model Explorer

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