A Dirac-type Characterization of k-chordal Graphs

Characterization of k-chordal graphs based on the existence of a "simplicial path" was shown in [Chv{\'a}tal et al. Note: Dirac-type characterizations of graphs without long chordless cycles. Discrete Mathematics, 256, 445-448, 2002]. We give a characterization of k-chordal graphs which is a generalization of the known characterization of chordal graphs due to [G. A. Dirac. On rigid circuit graphs. Abh. Math. Sem. Univ. Hamburg, 25, 71-76, 1961] that use notions of a "simplicial vertex" and a "simplicial ordering".Comment: 3 page

SYNTHESIS AND PHARMACOLOGICAL EVALUATION OF CERTAIN SCHIFF BASES OF OCTAHYDRO-1H-PYRROLO [3, 4-B] PYRIDINE DERIVATIVES

Objective: Synthesis, characterization and biological screening of some new 1,6-disubstituted Octahydro-1H-pyrrolo[3,4-b]pyridine Schiff base (13a-n) derivatives.Methods: The scaffold of Octahydro-1H-pyrrolo [3,4-b]pyridine Schiff bases was prepared, synthesised and screened for their biological activity.Results: The structure of newly synthesized compounds was characterized by spectral data and screened for their biological activity like antioxidant, antimicrobial, antifungal, and chelating efficacy activities against various bacteria and fungi strains. Screening revealed that several of these compounds (13a-n) showed potential biological activity.Conclusion: Investigation on newly synthesised 1,6-disubstituted Octahydro-1H-pyrrolo[3,4-b]pyridine Schiff base (13a-n) derivatives for their biological activity revealed that some of the compounds showed good antioxidant, chelating and antimicrobial properties. The fact that the newly synthesised Schiff bases in this study are chemically related to the current medication and suggests further work is clearly warranted and to be explored.Â

Tuning of Human Modulation Filters Is Carrier-Frequency Dependent

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