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Equienergetic chemical trees [PDF]
Journal of the Serbian Chemical Society, 2004 The energy E(G) of a graph G is the sum of the absolute values of the eigenvalues of G. Two graphs, G 1 and G 2, are said to be equienergetic if E(G 1) = E(G 2).We report here the results of the search for pairs of equienergetic acyclic molecular graphs (
Brankov Vladimir +2 more
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Equiseparable chemical trees [PDF]
Journal of the Serbian Chemical Society, 2003 Let n1(e|T) and n2(e|T) denote the number of vertices of a tree T, lying on the two sides of the edge e. Let T1 and T2 be two trees with equal number of vertices, let e be an edge of T1 and f an edge of T2.
BORIS FURTULA +2 more
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Randić ordering of chemical trees
Discrete Applied Mathematics, 2005 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Juan Rada, CARLOS Uzcategui
exaly +2 more sources
Zeitschrift Fur Naturforschung - Section A Journal of Physical Sciences, 2002 A variety of molecular-graph-based structure-descriptors were proposed, in particular the Wiener index W. the largest graph eigenvalue λ1, the connectivity index X, the graph energy E and the Hosoya index Z, capable of measuring the branching of the carbon-atom skeleton of organic compounds, and therefore suitable for describing several of their ...
Dusica Vidovic, Lutz Volkmann
exaly +2 more sources
Fixed-Order Chemical Trees with Given Segments and Their Maximum Multiplicative Sum Zagreb Index
MathematicsTopological indices are often used to predict the physicochemical properties of molecules. The multiplicative sum Zagreb index is one of the multiplicative versions of the Zagreb indices, which belong to the class of most-examined topological indices ...
Akbar Ali +4 more
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Chemical defoliation of fruit trees
California Agriculture, 1977 Trees in most mature peach, nectarine, and plum orchards in the southern San Joaquin Valley cease growth by early to mid-October. Because the foliage often persists on the trees for another three to five weeks and interferes with the pruner's vision, it ...
M Gerdts, G Obenauf, J LaRue, G Leavitt
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Chemical “pruning” of walnut trees
California Agriculture, 1980 A chemical pinching agent sprayed on young walnut trees in the spring reduced terminal growth and increased branching, producing a response similar to that obtained by pruning.
G Martin +3 more
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Hyper-Wiener index and Laplacian spectrum [PDF]
Journal of the Serbian Chemical Society, 2003 The hyper-Wiener index WWW of a chemical tree T is defined as the sum of the product n1 n2 n3, over all pairs υ,ν of vertices of T, where n1 and n2 are the number of vertices of T, lying on the two sides of the path which connects υ and ν, and n3 is the ...
Gutman Ivan
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Exponential second Zagreb index of chemical trees [PDF]
Transactions on Combinatorics, 2021 Cruz, Monsalve and Rada [Extremal values of vertex-degree-based topological indices of chemical trees, Appl. Math. Comput. 380 (2020) 125281] posed an open problem to find the maximum value of the exponential second Zagreb index for chemical ...
Selvaraj Balachandran, Tomas Vetrik
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Synthesis of Terpineol from Alpha-Pinene Catalyzed by α-Hydroxy Acids
Molecules, 2022 We report the use of five alpha-hydroxy acids (citric, tartaric, mandelic, lactic and glycolic acids) as catalysts in the synthesis of terpineol from alpha-pinene.
Zhong-Lei Meng +5 more
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