#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Bertz branching index has been proposed in Bertz, S. H. (1988). Branching in graphs and molecules. Discrete Applied Mathematics. doi.org/10.1016/0166...

Check #alvaDesc at: alvascience.com/alvadesc/

🔗 Learn more about alvaDesc and explore its molecular descriptor platform for QSAR, QSPR, and cheminformatics modeling:
alvascience.com/alvadesc/

#moleculardescriptors #cheminformatics #OECD #toxycology #machinelearning

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Quadratic index has been proposed in Balaban, A. T. (1979). Chemical graphs. Theoretica Chimica Acta, 53(4), 355–375. doi.org/10.1007/BF00...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Kupchik vertex degree has been proposed in "Molar Refraction Relationships of Alkylgermanes Using Molecular Connectivity" doi.org/10.1002/qsar...

Check #alvaDesc at: alvascience.com/alvadesc/

Second Zagreb Index

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Second Zagreb Index has been proposed in "Graph theory and molecular orbitals. XII. Acyclic polyenes" The Journal of Chemical Physics doi.org/10.1063/1.43...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Valence vertex degree has been proposed in "Derivation and Significance of Valence Molecular Connectivity" doi.org/10.1002/jps....

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

First Zagreb Index has been proposed in "Graph theory and molecular orbitals. Total φ-electron energy of alternant hydrocarbons" doi.org/10.1016/0009...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Wiener Index has been proposed by Harry Wiener in (1947). Structural Determination of Paraffin Boiling Points. via
@pubs.acs.org doi.org/10.1021/ja01...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Distance/detour ring indices have been described in Randić, M. (1997). On Characterization of Cyclic Structures. via @pubs.acs.org
doi.org/10.1021/ci97...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

The aromatic ratio is computed as the ratio of the number of aromatic atoms and the number of non-hydrogen atoms of the molecule.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

The aromatic ratio is computed as the ratio of the number of aromatic bonds and the number of non-hydrogen bonds of the molecule.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

The normalised number of ring systems is computed as the ratio of the number of ring systems to the cyclomatic number of the molecule.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Number of ring systems has been described in "Property Distributions: Differences Between Drugs, Natural Products, and Molecules..." doi.org/10.1002/chin...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Ring Complexity Index has been proposed in "An Algorithm for the Perception of Synthetically Important Rings" doi.org/10.1021/ci60...

Check #alvaDesc at: alvascience.com/alvadesc/

A strong example of alvaDesc + interpretable ML accelerating inhibitor discovery.

🔗 alvascience.com/alvadesc/

#Alvascience #alvaDesc #MachineLearning #Corrosion #QSAR #moleculardescriptors #cheminformatics #machinelearning

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Molecular Cyclized Degree has been proposed in "Implementing the Fisher’s Discriminant Ratio in a k -Means Clustering Algorithm..." doi.org/10.1021/ci03...

Check #alvaDesc at: alvascience.com/alvadesc/

🔥 ML-guided design of flame-retardant polyurethane foams (Sun et al., 2026).

Using 800 #moleculardescriptors from #alvaDesc + formulation data, an #XGBoost model predicted LOI with R² = 0.84.

📖 Paper doi.org/10.1016/j.po...
🔗 alvaDesc: alvascience.com/alvadesc/

#cheminformatics #chemsky

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

The cyclomatic number is the minimum number of edges to be removed from a graph in order to remove all its cycles and gives the cardinality of the SSSR.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

MWcorr is a modified version of molecular weight designed to better correlate with the McGowan volume when working with halogenated compounds.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

The total charge, also know as Electronic Charge Index (ECI) has been described in "Amino Acid Side Chain Descriptors for..." doi.org/10.1021/jm00...

Check #alvaDesc at: alvascience.com/alvadesc/

🌍 New publication using alvaDesc in Environment International (2026)

Wang et al. developed interpretable multi-species QSAR models to predict aquatic toxicity across five native species, using 5,305 molecular descriptors calculated with alvaDesc.

#alvaDesc #moleculardescriptors #paper

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Fsp3 is a complexity index, also known as aliphatic indicator (i_ali) has been proposed in doi.org/10.1002/qsar... and doi.org/10.1021/jm90...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Graph density represents the ratio between the number of bonds and the number of all possible bonds in a graph.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Rotatable Bond Fraction is calculated as the ratio between the number of rotatable bonds and the total number of bonds of a molecule.

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips

Coulomb matrix has been proposed by
@profvlilienfeld.bsky.social et al. in "Fast and accurate modeling of molecular..." doi.org/10.1103/Phys... via @physrevlett.bsky.social

Check #alvaDesc at: alvascience.com/alvadesc/

alvaDesc - Alvascience alvaDesc Calculate, Explore, and Export Molecular Descriptors and Fingerprints AlvaDesc is a powerful, user-friendly software for generating high-quality molecular

In a few minutes, see how to:
✔ Load molecules
✔ Generate 3D coordinates
✔ Calculate descriptors & fingerprints
✔ Analyze and export results

🔗 Learn more:
www.alvascience.com/alvadesc/

#Alvascience #alvaDesc #QSAR #Cheminformatics #MolecularDescriptors #chemsky

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips

Barysz matrix has been proposed in "QSAR Comparative Study of Wiener Descriptors for Weighted Molecular Graphs" doi.org/10.1021/ci00... @pubs.acs.org

Check #alvaDesc at: alvascience.com/alvadesc/

📘 New paper (Ghosh et al., 2026): interpretable ML/QSPR models to predict sweet vs non-sweet and bitter vs non-bitter compounds on a large curated dataset.
Paper: doi.org/10.1016/j.ji...

#QSPR #bitterness #sweetness #moleculardescriptors #alvaDesc #chemsky

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips

Burden matrix has been proposed in Burden, F. R. (1989). Molecular identification number for substructure searches. via
@pubs.acs.org
doi.org/10.1021/ci00...

Check #alvaDesc at: alvascience.com/alvadesc/

#descriptoroftheday #moleculardescriptors #qsar #cheminformatics #alvatips #chemsky

Atomic charge weighted negative surface area has been proposed in "Development and Use of Charged Partial..." doi.org/10.1021/ac00... via @elsevierconnect.bsky.social

Check #alvaDesc at: alvascience.com/alvadesc/