Efficiently Target Conformations with NSL Conformation Attributes

Molecular modelers often encounter challenges when filtering and identifying specific conformations during simulations or when inspecting molecular structures. This process can be time-consuming without precise tools, especially when dealing with large datasets. In SAMSON, the Node Specification Language (NSL) offers an effective way to streamline this process through its conformation attribute space. In this post, we explore how you can use conformation attributes to work smarter, not harder, in molecular modeling workflows.

What Are Conformation Attributes?

The conformation attribute space, identified by the short name co, is a powerful way to match and target attributes specific to conformation nodes in SAMSON. It complements the general node attribute space by focusing solely on conformations. Using these attributes, you can apply precise filters based on criteria like names, selection status, and the number of atoms.

Key Conformation Attributes

Here’s an overview of some essential attributes you can leverage in the conformation attribute space to target specific molecular conformations:

1. name (n)

The name attribute allows you to match conformations by their names. Its short form (n) makes it handy for quick queries. For instance:

  • co.n "A": matches conformations named “A”.
  • co.n "L*": targets conformations with names beginning with “L”.

By integrating name-based filters, you can isolate specific conformations by their identifiers in no time.

2. numberOfAtoms (nat)

One of the most useful conformation-specific attributes is numberOfAtoms, referred to as co.nat in short form. This attribute matches conformations based on the number of atoms they contain. Examples include:

  • co.nat > 100: matches conformations with more than 100 atoms.
  • co.nat 100:200: targets conformations containing between 100 and 200 atoms.

With numberOfAtoms, you can fine-tune selections in molecular datasets, eliminating irrelevant structures.

3. selected and selectionFlag

These attributes help you target conformations based on their selection status. While selected identifies whether a node is selected, selectionFlag (sf) indicates a flag’s state:

  • co.selected: matches selected conformations.
  • not co.selected: excludes selected conformations.
  • co.sf: matches conformations flagged as true.
  • co.sf false: targets conformations flagged as false.

These filters can help streamline operations in workflows with mixed or partially processed conformations.

Making the Most of NSL Conformation Attributes

By combining these attributes creatively, modelers can precisely isolate conformations of interest even in complex projects. For instance, combining co.nat and selected allows users to filter large systems by selecting nodes within a specific atomic range and selection flag.

For detailed documentation on how to use these attributes, including example expressions and advanced queries, visit the official SAMSON documentation page.

SAMSON and all SAMSON Extensions are free for non-commercial use. You can get SAMSON at https://www.samson-connect.net.

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