Chem3D 8.0 Manual - CambridgeSoft

Change the model display type:Build ethane:Administrator1. From the View menu, choose Settings.The Chem3D Setting dialog box appears.2. Select Model Display and choose Wire Frameas the Model Type.3. Rotate the model so you are viewing it down thecenter of the helix as shown below:1. From the File Menu, choose New Model.2. From the File Menu, choose Save As.3. Select a directory in which to save the file.4. Type “tut3”.5. Click Save.6. Click the Text Building tool .7. Click an empty space in the model window.8. Type “CH3CH3”.9. Press Enter.A model of ethane appears.4. In the Chem3D Setting dialog box, chooseRibbons as the Model Type to see analternative display commonly used for proteins.Tutorial 3: ExaminingConformationsThis tutorial uses steric energy values to comparetwo conformations of ethane. The conformer withthe lower steric energy value represents the morelikely conformation.View the Measurements table:1. From the Analyze menu, point to ShowMeasurements, and then choose Show BondLengths.2. From the Analyze menu, point to ShowMeasurements, and then choose Show BondAngles.The Measurements table appears with theinformation you chose. The measurements inthe Actual and Optimal columns are nearlyidentical. The Actual column represents themeasurements for the model in the activewindow. The Optimal measurements (for bondlengths and bond angles only) represent thestandard measurements in the Bond Stretchingand Angle Bending parameter tables.26 • Chapter 2: Tutorials CambridgeSoftTutorial 3: Examining Conformations