Molecular modelers often face the challenge of navigating and refining complex datasets containing molecular structures. With numerous atoms, chains, segments, and other components, filtering and analyzing relevant data becomes cumbersome without the right tools. Enter SAMSON’s Folder Attributes—a powerful part of the Node Specification Language (NSL) in SAMSON designed to simplify this process. Let’s explore what Folder Attributes bring to the table and how they can enhance your modeling workflows.
What are Folder Attributes?
Folder Attributes refer to the attribute space of folder nodes in SAMSON, identified by the short name f. These attributes allow you to refine and manipulate folder nodes within your molecular model by enabling filter and search queries based on specific parameters such as visibility, the number of atoms, number of chains, molecular structure, and much more. In short, these attributes let you zoom in on what matters most to your research, saving time and effort.
Key Features of Folder Attributes
Here are some key properties and use cases of the Folder Attributes that could make your molecular modeling experience more efficient:
1. Focus with Visibility and Selection Attributes
For example, using attributes like visible (f.v) and selected (f.selected), you can easily filter folders that are visible or selected. This is especially useful when dealing with large models where parts of the structure might be hidden or not relevant for analysis.
Examples:
- To find only visible folders:
f.v - To exclude selected folders:
not f.selected
2. Precision Management with Numeric Attributes
Attributes such as numberOfAtoms (f.nat), numberOfChains (f.nc), and numberOfMolecules (f.nm) enable queries based on specific quantities. Whether you’re isolating portions of a complex molecular assembly or running data analysis, these attributes help manage such numeric details.
Examples:
- To detect folders with fewer than 1000 atoms:
f.nat < 1000 - To identify folders holding a specific number of chains, say between 2 and 4:
f.nc 2:4
3. Diving Deep with Element Attributes
When specific atom groups such as carbon, hydrogen, or nitrogen are of interest, attributes like numberOfCarbons (f.nC), numberOfHydrogens (f.nH), and numberOfNitrogens (f.nN) allow you to pinpoint subsets of your data with precision.
Example:
- To find folders with more than 10 Carbon atoms:
f.nC > 10
4. Fine-Tuning with Full and Partial Charges
If you’re interested in charges within molecular folders, the formalCharge (f.fc) and partialCharge (f.pc) attributes support refining search queries based on charge values.
Examples:
- To find structures with a formal charge between 6 and 8:
f.fc 6:8 - To isolate structures with a partial charge greater than 1.5:
f.pc > 1.5
Streamlined Workflows
By combining these attributes, you can create complex queries to refine your molecular models and focus only on relevant data. For example:
f.nm 2:3 and f.nat < 100 and f.v: This query finds visible molecular folders with 2-3 molecules and fewer than 100 atoms per folder.f.fc -5:5 and not f.hidden: This matches folders with a formal charge between -5 and 5 that aren’t hidden.
Why Use Folder Attributes?
Dealing with molecular data involves extensive and often tedious filtering processes. Folder Attributes provide a systematic and powerful language to interact with molecular datasets, streamlining workflows for both beginners and experienced modelers. Whether you’re sifting through structural groups, visibility states, or specific elements, Folder Attributes are designed to reduce complexity and improve focus.
Explore the full guide to Folder Attributes in the official SAMSON documentation. You’ll find precise definitions, examples, and links that will help you take full advantage of these capabilities.
SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON now at https://www.samson-connect.net.