Results 41 to 50 of about 34,525 (341)

Molecular Shape Descriptors. 1. Three-Dimensional Molecular Shape Descriptor

open access: yesZeitschrift für Naturforschung A, 1985
The paper presents and illustrates a method which uses numerical integration of the van der Waals envelope(s) to calculate with desired accuracy the molecular van der Waals volume and the three-dimensional molecular shape descriptor defined as the twin-number [OV(α, β); NOV(β, α), where OV and NOV represent the overlapping and, respectively, the ...
I. Motoc   +3 more
openaire   +1 more source

The Sanskruti index of trees and unicyclic graphs

open access: yesOpen Chemistry, 2019
The Sanskruti index of a graph G is defined as S(G)=∑uv∈E(G)sG(u)sG(v)sG(u)+sG(v)−23,$$\begin{align*}S(G)=\sum_{uv\in{}E(G)}{\left(\frac{s_G(u)s_G(v)}{s_G(u)+s_G(v)-2}\right)}^3, \end{align*}$$where sG(u) is the sum of the degrees of the neighbors of a ...
Deng Fei   +6 more
doaj   +1 more source

Stereo Signature Molecular Descriptor

open access: yes, 2016
We present an algorithm to compute molecular graph descriptors considering the stereochemistry of the molecular structure based on our previously introduced signature molecular descriptor. The algorithm can generate two types of descriptors, one which is
Lars Carlsson (10323)   +2 more
core   +1 more source

A constructive approach for discovering new drug leads: Using a kernel methodology for the inverse-QSAR problem

open access: yesJournal of Cheminformatics, 2009
Background The inverse-QSAR problem seeks to find a new molecular descriptor from which one can recover the structure of a molecule that possess a desired activity or property.
Wong William WL, Burkowski Forbes J
doaj   +1 more source

Calculation of Quantitative Structure-Activity Relationship Descriptors of Artemisinin Derivatives [PDF]

open access: yesMongolian Journal of Biological Sciences, 2008
Quantitative structure-activity relationships are based on the construction of predictive models using a set of known molecules and associated activity value.
Jambalsuren Bayarmaa, Vladimir Frecer
doaj   +1 more source

Molecular Descriptor and Criterion for Efficient N-Doping of Organic Semiconductors

open access: yes, 2023
Precursor dopants activated by C-H bond cleavage, especially N-DMBI-H derivates, are the most commonly used n-dopants for organic semiconductors (OSCs), however, their doping mechanism and the structure-activity relationship remain unclear.
Dong, Wang, Chunlin, Xu
core   +1 more source

Clinical and Biological Features of Response in Resistant Neuroblastoma to 131I‐Metaiodobenzylguanidine Radiotherapy in the Anti‐GD2 Immunotherapy Era

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Background 131I‐metaiodobenzylguanidine (131I‐MIBG) radiotherapy is a key treatment for relapsed and refractory (R/R) neuroblastoma (NB). Patients with R/R disease treated in the modern era are increasingly exposed to anti‐GD2 immunotherapy, which exerts selective pressure and may modify both tumor cell state and microenvironment.
Benjamin J. Lerman   +7 more
wiley   +1 more source

Mining Structural Information from Gas Chromatography-Electron-Impact Ionization-Mass Spectrometry Data for Analytical-Descriptor-Based Quantitative Structure–Activity Relationship

open access: yesJournal of Xenobiotics
Recently developed quantitative structure–activity relationship (QSAR) prediction uses machine learning techniques with analytical signals from the full scan of mass spectra as input, and does not need exhaustive structural determination to assess ...
Yasuyuki Zushi
doaj   +1 more source

Shape-based two dimensional descriptor for searching molecular database [PDF]

open access: yes, 2014
Biological functions of compounds can be predicted from similarity of their chemical structures to discover new compounds for drug development. Molecular similarity can also be used to infer unknown functions and side effects of existing drugs.
Hamza, Hentabli
core  

Special Issue on Flexible Molecular Descriptors [PDF]

open access: yesMolecules, 2004
Molecular indices are characterized by fixed numerical values, which are independent of the physical chemistry property or/and biological activity considered.[...]
Toropov, Andrey A., Castro, Eduardo A.
openaire   +3 more sources

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