Results 41 to 50 of about 175,962 (155)

Early evolutionary history of the seed

Biological Reviews, EarlyView.
ABSTRACT The seed is an essential stage in the life history of gymnospermous and angiospermous plants, facilitating both their survival and dispersal. We reappraise knowledge of the evolutionary history of the gymnospermous seed, from its origin in the late Devonian through to the well‐known end‐Permian extinctions – an interval encompassing the ...
Richard M. Bateman, Alan R. T. Spencer, Jason Hilton   +2 more
wiley   +1 more source

Interfacial adsorption characteristics of surfactant‐modified nanoparticles: Equilibrium and dynamic effects of salinity at the oil–water interface

The Canadian Journal of Chemical Engineering, EarlyView.
Surfactant‐modified nanoparticles adsorb at the oil–water interface, enabling interfacial stabilization and microemulsion formation. Abstract This study systematically investigated the interfacial behaviour of silicon dioxide (SiO2) and aluminium oxide (Al2O3) nanoparticles (NPs) functionalized with cationic (CTAB), anionic (SDS), and nonionic (Triton ...
Behrooz Ahmadi, Eghbal Sahraei, Amir H. Mohammadi   +2 more
wiley   +1 more source

The Wiener and Terminal Wiener indices of trees [PDF]

, 2013
Heydari \cite{heydari2013} presented very nice formulae for the Wiener and terminal Wiener indices of generalized Bethe trees. It is pity that there are some errors for the formulae.
Chen, Ya-Hong, Zhang, Xiao-Dong
core  

The proof of a conjecture on largest Laplacian and signless Laplacian H-eigenvalues of uniform hypergraphs

, 2015
Let $\mathcal{A(}G\mathcal{)},\mathcal{L(}G\mathcal{)}$ and $\mathcal{Q(}% G\mathcal{)}$ be the adjacency tensor, Laplacian tensor and signless Laplacian tensor of uniform hypergraph $G$, respectively.
Qi, Liqun, Shao, Jiayu, Yuan, Xiying
core   +1 more source

Minimum eigenvalue of the complement of tricyclic graphs with n-4 pendent vertexes

Journal of Hebei University of Science and Technology, 2019
In order to discuss the minimum eigenvalue of adjacency matrix in the class of complementary graphs of the tricyclic graph with a given order of n and n－4 pendent vertexes, the unique graph whose minimum eigenvalue reaches the minimum is characterized.
Hongjuan JU, Yingjie LEI
openaire   +1 more source

Warming‐Mediated Decreases in Nectar Quality Translate Into Lower Energy Reserves of the Monarch Butterfly (Danaus plexippus)

Global Change Biology Communications, EarlyView.
Warming caused a significant decrease in monarch fat mass, likely due to an observed reduction in sucrose concentration caused by warming of the nectar. Since sucrose fuels fall migration and overwintering, our results suggest climate warming may reduce migration success and overwinter survival.
Katherine Peel, Greg W. Mitchell, Christopher G. Guglielmo, Heather M. Kharouba   +3 more
wiley   +1 more source

The spectral Turán problem about graphs of given size with forbidden subgraphs

AKCE International Journal of Graphs and Combinatorics
Let G be a graph of size m and [Formula: see text] be the spectral radius of its adjacency matrix. A graph is said to be H-free if it does not contain a subgraph isomorphic to H. Let [Formula: see text] be the graph obtained by adding a pendent vertex to
Amir Rehman, S. Pirzada
doaj   +1 more source

Fast algorithms for min independent dominating set

, 2009
We first devise a branching algorithm that computes a minimum independent dominating set on any graph with running time O*(2^0.424n) and polynomial space. This improves the O*(2^0.441n) result by (S. Gaspers and M. Liedloff, A branch-and-reduce algorithm
D.S. Johnson, J.M. Byskov, J.W. Moon, M. Cygan, M.M. Halldórsson, M.R. Garey, N. Bourgeois, N. Bourgeois, P. Alimonti, S. Gaspers   +9 more
core   +2 more sources

The Individual and Combined Effects of Warming and Atrazine on Lithobates pipiens Phenotypes: Implications for Frog Declines

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, EarlyView.
ABSTRACT Amphibians are the most threatened vertebrate class globally. Climate change, agrochemicals, and/or pathogens and parasites are implicated in contributing to amphibian declines, either singly or in combination. We investigated individual and combined effects of elevated temperatures and atrazine (2.0 μg/L) on Lithobates [formerly Rana] pipiens
Melody J. Gavel, Mark R. Forbes, Derek D. N. Smith, Julia Darabaner, Yol Monica Reyes, Zintis Stasko, David J. Carpenter, Stacey A. Robinson   +7 more
wiley   +1 more source

The Minimal Total Irregularity of Graphs [PDF]

, 2014
In \cite{2012a}, Abdo and Dimitov defined the total irregularity of a graph $G=(V,E)$ as \hskip3.3cm $\rm irr_{t}$$(G) = \frac{1}{2}\sum_{u,v\in V}|d_{G}(u)-d_{G}(v)|, $ \noindent where $d_{G}(u)$ denotes the vertex degree of a vertex $u\in V$.
Yang, Jieshan, You, Lihua, Zhu, Yingxue
core