Gayathri Murugesan

Bio: Gayathri Murugesan is an academic researcher from Gandhigram Rural Institute. The author has contributed to research in topics: Adjacency list & Type (model theory). The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Leucas aspera mediated SeO nanoparticles synthesis for exploiting its pharmaceutical efficacy

Abstract: The aim of this study is to synthesis Selenium oxide (SeO) nanoparticles using the leaf extract of Leucas aspera . The leaf extract has been reported to show phytochemicals effective for reducing Selenium precursors. Furthermore, these phytochemicals has being reported to show capping and stabilizing property. As-prepared nanoparticles physico-chemical properties were assessed by a array of various characterization technique. UV-Vis and XRD assessment showed maximum absorbance at 273 nm with high crystalline property. Qualitative assessment using FTIR assessment was performed to assess the phytochemical based functional groups presence which helped in reducing, stabilizing of the prepared nanoparticles. Morphological assessment of nanoparticles showed spherical attributes with good aggregation. Functional attributes of SeO nanoparticles for exploiting its pharmaceutical application, illustrated a significant antibacterial activity against both gram negative and gram-positive strains comparable to commercially available antibiotics. Moreover, MTT assay was employed to assess anticancer behaviour of SeO nanoparticles towards MG-63 cells, which showed effective reduction in cell viability. Furthermore, the study confirms photo catalytic degradation property of SeO nanoparticles towards dye degradation. The study not only discusses the SeO nanoparticles physico-chemical and functional properties, but and also opens future scope of SeO in clinical and environmental applications. • Prepared SeO nanoparticles from Leucas aspera stem extract by green synthesis. • Enhanced structural, dye degradation and antibacterial activity. • MTT assay method is used for the analysis of the anticancer activity of SeO.

Spectra of partitioned matrices and the $${\mathcal {M}}$$ M -join of graphs

Abstract: In this paper, first we consider some partitioned matrices having some special kind of blocks, and we obtain their eigenvalues and eigenvectors. From these, we deduce several results on the eigenvalues of partitioned matrices in the literature. Next we consider an extension of a generalized join of graphs introduced by Hedetniemi (On classes of graphs defined by special cutsets of lines. In: Many facets of graph theory. Proceedings of the conference held at Western MiGammagan University, Kalamazoo/Mi, 1968. Lecture notes in mathematics, vol 110, pp 171–189, 1969), we call it the $${\mathcal {M}}$$ -join of $${\mathcal {H}}_k$$ . The spectra of partitioned matrices allow to detect the adjacency, the Laplacian and the signless Laplacian spectrum of old and new type of join of graphs. Further, we have constructed several pairs of simultaneously A-cospectral, L-cospectral and Q-cospectral graphs.

An Introduction to the Theory of Graph Spectra: Spectral techniques

Abstract: Preface 1. Introduction 2. Graph operations and modifications 3. Spectrum and structure 4. Characterizations by spectra 5. Structure and one eigenvalue 6. Spectral techniques 7. Laplacians 8. Additional topics 9. Applications Appendix Bibliography Index of symbols Index.

Spectra of M-edge rooted product of graphs

Abstract: In this paper, we define a graph operation, namely, M-edge rooted product of graphs. This generalizes the existing graph operation called graphs with edge pockets. Also we introduce a matrix invariant, namely, coronal of a matrix constrained by the index sets. We compute this value for some class of matrices with respect to some index sets. We obtain the generalized characteristic polynomial of the graph obtained by M-edge rooted product with a help of this invariant. Consequently, we deduce the characteristic polynomial of the adjacency matrix, the Laplacian matrix and the signless Laplacian matrix of this graph. Using these results, we derive the L-spectrum of several families of M-edge rooted product of graphs and deduce several existing results on the spectra of graphs with edge pockets in the literature. As applications, we obtain infinitely many L-cospectral graphs and construct A-integral graphs, L-integral graphs.

Nanoiron: Uptake, translocation and accumulation in plant systems

Abstract: Nanoparticles (NPs) bear unique properties that leads to its immense application in diverse domains. But excessive use of metal oxide nanoparticles (MONPs) in various industrial sectors may lead to detrimental impacts on our environment in the near future. Among NPs, applications of nanoiron in various industrial sectors are gradually increasing and its interaction with the soil-plant system is an area still to be explored. In this review, we have focused upon positive as well as the negative impact of nanoiron in plants. As per available literature, it is evident that higher concentration of nanoiron causes oxidative stress while lower concentration leads to plant growth promotion. In addition to this, review also highlights the uptake, translocation and accumulation of nanoiron in plant system which subsequently leads to alterations in the morpho-physiological, biochemical and molecular traits of plants. Moreover, various factors contributing towards the translocation of nanoiron in shoot and root system of plants has been duly discussed.