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The massXpert software package is a mass spectrometry environment for linear (bio-)polymers. It inherits all the innovations of GNU polyxmass. It allows the detailed definition of new polymer chemistries in the XpertDef module. These chemistry definitions are then used in the desktop calculator-like mass calculator (XpertCalc) and in the sophisticated polymer sequence editor and (bio-)chemical/mass spectrometric simulations module (XpertEdit). Available simulations include polymer and monomer chemical modifications, polymer sequence cleavage, gas-phase fragmentation, m/z ratio calculations, and more. License: GNU General Public License (GPL) Changes:
This release can select an arbitrary number of regions in the polymer sequence. This feature is required to make the most out of the cross-linking simulations available in massXpert. The implications of this new development are pervasive all through the project and should allow even more intuitive simulations to be performed in the XpertEdit module.

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