Quickly find non-hydrogen atoms with NSL

When working with complex molecular systems, modelers often need to isolate specific groups of atoms to perform targeted operations, run simulations, or build visualizations. One recurring task is selecting heavy atoms — that is, atoms that are not hydrogen. This…

Creating Custom Atom Selection Groups in GROMACS Using SAMSON

When setting up a molecular system for simulation in GROMACS, atom group selections—known as index groups—play an important role in defining regions for restraints, analysis, and advanced sampling techniques like umbrella sampling. While GROMACS automatically generates standard index groups (e.g.,…