Results 11 to 20 of about 267,386 (266)

Constitutive and insect‐induced transcriptomes of weevil‐resistant and susceptible Sitka spruce

open access: yesPlant-Environment Interactions, 2021
Spruce weevil (Pissodes strobi) is a significant pest of regenerating spruce (Picea) and pine (Pinus) forests in North America. Weevil larvae feed in the bark, phloem, cambium, and outer xylem of apical shoots, causing stunted growth or mortality of ...
Justin G. A. Whitehill   +2 more
doaj   +1 more source

Model theory of R-trees

open access: yesJournal of Logic and Analysis, 2020
We show the theory of pointed $\R$-trees with radius at most $r$ is axiomatizable in a suitable continuous signature. We identify the model companion $\rbRT_r$ of this theory and study its properties. In particular, the model companion is complete and has quantifier elimination; it is stable but not superstable.
Carlisle, Sylvia, Henson, C. Ward
openaire   +4 more sources

A note on r-equitable k-colorings of trees [PDF]

open access: yesYugoslav Journal of Operations Research, 2014
A graph G = (V;E) is r-equitably k-colorable if there exists a partition of V into k independent sets V1, V2,... Vk such that ||Vi|- |Vj|| ≤ r for all i,j  {1,2... k}.
Hertz Alain, Ries Bernard
doaj   +1 more source

Analyzing the effect of clustered spatial distribution of mount Atlas mastic (Pistacia atlantica Desf.) trees on their biometric characteristics using mark-correlation function in Baneh Research Forest, Fars province [PDF]

open access: yesتحقیقات جنگل و صنوبر ایران, 2017
The spatial distribution analysis of trees in arid and semi-arid regions presents valuable information about their interactions and impacts on one another.
Narges Kariminejad   +3 more
doaj   +1 more source

On the Extremal Trees for Some Bond Incident Degree Indices with a Fixed Number of Segments

open access: yesJournal of Chemistry, 2022
The Gourava indices and hyper-Gourava indices are introduced by Kulli in 2017. These graph invariants are related to the degree of vertices of a graph G. Let Tn,r be the class of all n−vertex chemical trees with r segments. In this paper, we characterize
Muzamil Hanif   +3 more
doaj   +1 more source

The R Package stagedtrees for Structural Learning of Stratified Staged Trees

open access: yesJournal of Statistical Software, 2022
stagedtrees is an R package which includes several algorithms for learning the structure of staged trees and chain event graphs from data. Score-based and clustering-based algorithms are implemented, as well as various functionalities to plot the models ...
Federico Carli   +3 more
doaj   +1 more source

Dynamic changes in rhizosphere bacterial communities of Rhododendron simsii at different growth stages [PDF]

open access: yesBotanica Serbica
Rhododendron simsii plays important roles in maintaining ecological system stability in the north temperate zone. However, its natural growth is greatly affected by soil microorganisms, particularly rhizosphere microbes.
Jun Fu   +6 more
doaj   +1 more source

Family Communication about End-of-Life Decisions and the Enactment of the Decision-Maker Role

open access: yesBehavioral Sciences, 2017
End-of-life (EOL) decisions in families are complex and emotional sites of family interaction necessitating family members coordinate roles in the EOL decision-making process.
April R. Trees   +2 more
doaj   +1 more source

Species divergence and phylogenetic variation of ecophysiological traits in lianas and trees. [PDF]

open access: yesPLoS ONE, 2014
The climbing habit is an evolutionary key innovation in plants because it is associated with enhanced clade diversification. We tested whether patterns of species divergence and variation of three ecophysiological traits that are fundamental for plant ...
Rodrigo S Rios   +2 more
doaj   +1 more source

Constructing Multivariate Survival Trees: The MST Package for R

open access: yesJournal of Statistical Software, 2018
Multivariate survival trees require few statistical assumptions, are easy to interpret, and provide meaningful diagnosis and prediction rules. Trees can handle a large number of predictors with mixed types and do not require predictor variable ...
Peter Calhoun   +3 more
doaj   +1 more source

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