Results 61 to 70 of about 175,962 (155)
A new species of Amphitecna (Bignoniaceae) endemic to the mountain karst forests of southern Mexico
Nordic Journal of Botany, Volume 2026, Issue 2, February 2026.Amphitecna brevicalyx (Bignoniaceae), a new tree species endemic to Mexico is described and illustrated. Its cauliflorous inflorescences, featuring a single flower per shoot and funnelform corollas without a transverse fold in the throat, place it within the Amphitecna macrophylla group.
Leopoldo Hurtado‐Reveles +1 more
wiley +1 more source
Maximum atom-bond sum-connectivity index of n-order trees with fixed number of leaves [PDF]
Discrete Mathematics Letters, 2023 Sadia Noureen, Akbar Ali
doaj +1 more source
Aster tongrenensis (Asteraceae), a remarkable new species from Guizhou, China
Nordic Journal of Botany, Volume 2026, Issue 2, February 2026.Aster tongrenensis (Asteraceae), a remarkable new species from Guizhou, China, is here described, illustrated and compared with related taxa based on integrated evidence from morphology, micromorphology and molecular phylogeny. Morphological and micromorphological observations indicate that A. tongrenensis is most similar to A.
Zhi‐Xin Quan +3 more
wiley +1 more source
BURIED ORNAMENTS: EXPLORING FUNERARY BEHAVIOURS IN THE CHALCOLITHIC FROM THE LOWER DANUBE
Oxford Journal of Archaeology, Volume 45, Issue 1, Page 2-27, February 2026.Summary This article focuses on personal adornments found in Chalcolithic funerary contexts from the Lower Danube. Generally, these artefacts are made from exotic raw materials originating from the Mediterranean sea, particularly Spondylus shells, along with Glycymeris or Antalis shells, and less frequently from local materials.
Monica Mărgărit
wiley +1 more source
Angewandte Chemie, Volume 138, Issue 2, 9 January 2026.Well‐defined migration of Csp, Csp2, and Csp3 hydrocarbyls from Pd(II) compounds to a nontrigonal P(III) ligand scaffold is reported. The structural and spectroscopic features of the resulting complexes reveal a conserved Pd─P interaction. The results demonstrate the nonspectator role of structurally constrained tricoodinate P(III) ligands in palladium
Lily Ueh‐Hsi Wang +3 more
wiley +1 more source
On the maximum atom-bond sum-connectivity index of graphs
Open MathematicsThe atom-bond sum-connectivity (ABS) index of a graph GG with edges e1,…,em{e}_{1},\ldots ,{e}_{m} is the sum of the numbers 1−2(dei+2)−1\sqrt{1-2{\left({d}_{{e}_{i}}+2)}^{-1}} over 1≤i≤m1\le i\le m, where dei{d}_{{e}_{i}} is the number of edges adjacent
Alraqad Tariq +3 more
doaj +1 more source
On the k th Eigenvalues of Trees with Perfect Matchings
Discrete Mathematics & Theoretical Computer Science, 2007 Let Τ + 2p be the set of all trees on 2p (p≥ 1) vertices with perfect matchings. In this paper, we prove that for any tree T in Τ + 2p, its k-th largest eigenvalue λ k (T) satisfies λ k (T)≤ 1 / 2 (√{⌈p / k⌉-1}+ √{⌈p / k⌉+3}) (k=1,2,..,p ...
Wai Chee Shiu, An Chang
doaj
Elliptic Sombor index of trees and unicyclic graphs
Electronic Journal of MathematicsLet G = G ( V, E ) be a simple connected graph with vertex set V and edge set E . The elliptic Sombor index of G is defined as ESO ( G ) = (cid:80) uv ∈ E ( d ( u ) + d ( v )) (cid:112) d 2 ( u ) + d 2 ( v ) , where d ( u ) denotes the degree of vertex u .
Zikai Tang, Yunping Li, Hanyuan Deng
semanticscholar +1 more source
Conjugated tricyclic graphs with maximum variable sum exdeg index. [PDF]
Heliyon, 2023 Rizwan M, Bhatti AA, Javaid M, Shang Y.
europepmc +1 more source
On the spectrum, energy and Laplacian energy of graphs with self-loops. [PDF]
Heliyon, 2023 Preetha P U, Suresh M, Bonyah E.
europepmc +1 more source