Results 71 to 80 of about 113,106 (354)

Bio‐Based Epoxy Resins from Estragole: Achieving High Glass Transition Temperatures Comparable to DGEBA and Simultaneously Low Viscosities

Macromolecular Materials and Engineering, EarlyView.
Two novel bio‐based epoxy monomers, diglycidyl‐4‐allylphenol (DG‐4A) and triglycidyl‐diallylphenol (TG‐DA), derived from estragole (92% and 72% bio‐content), were synthesized and cured with isophorone diamin (IPDA) and 4,4´‐diaminodiphenyl sulfone (DDS). The resins show high Tgs, with DG‐4A reaching and TG‐DA exceeding DGEBA‐based systems. These resins
Florian Bauer, Elisabeth Schamel, Herbert Schlachter, Gerd Wehnert, Dominik Söthje   +4 more
wiley   +1 more source

Clarifying nomenclatural uncertainties in Jupunba (Caesalpinioideae, Leguminosae)

Nordic Journal of Botany, EarlyView.
Molecular phylogenetic studies have prompted substantial revisions in the systematics of the former genus Abarema, resulting in the reinstatement of the genera Punjuba and Jupunba, and a re‐circumscription of Abarema. Despite these advances, some taxa still require nomenclatural adjustments to reflect monophyletic lineages.
Ethiéne Guerra, Marcos Vinicius Batista Soares, Marli Pires Morim, João Ricardo Vieira Iganci   +3 more
wiley   +1 more source

Taxonomic investigation of Abrothallus (Abrothallales, Ascomycota) species associated with lichen genera Ramalina and Bryoria, including the description of a new species

Nordic Journal of Botany, EarlyView.
The obligately lichenicolous genus Abrothallus consists of approximately 50 species, almost all of which are associated with lichens having foliose, fruticose, or pendulous thalli. This paper focuses on species that grow on strap lichens (Ramalina) providing new insights into their phylogenetic relationships and distribution.
Ave Suija, Pieter van den Boom, Franz Berger, Mihkel Suija, John W. Thayer, Andreas Frisch   +5 more
wiley   +1 more source

Radial Growth Response of Black Spruce Stands Ten Years after Experimental Shelterwoods and Seed-Tree Cuttings in Boreal Forest

, 2016
Partial cutting is thought to be an alternative to achieve sustainable management in boreal forests. However, the effects of intermediate harvest intensity (45%–80%) on growth remain unknown in black spruce (Picea mariana (Mill.) B.S.P.) stands, one of ...
M. M. Girona, H. Morin, J. Lussier, Denis Walsh   +3 more
semanticscholar   +1 more source

Distilling food web dynamics: top–down and bottom–up drivers of extinction and trophic cascades

Oikos, EarlyView.
Quantifying population dynamics is a fundamental challenge in ecology and evolutionary biology, particularly for species that are cryptic, microscopic, or extinct. Traditional approaches rely on continuous representations of population size, but in many cases, the precise number of individuals is unknowable.
Justin D. Yeakel
wiley   +1 more source

Extensive Families of miRNAs and PHAS Loci in Norway Spruce Demonstrate the Origins of Complex phasiRNA Networks in Seed Plants

Molecular biology and evolution, 2015
In eudicot plants, the miR482/miR2118 superfamily regulates and instigates the production of phased secondary small interfering RNAs (siRNAs) from NB-LRR (nucleotide binding leucine-rich repeat) genes that encode disease resistance proteins.
Rui Xia, Jing Xu, S. Arikit, B. Meyers
semanticscholar   +1 more source

A graduated nativeness definition for overcoming dilemmas and difficulties of vascular plant species

Oikos, EarlyView.
Nativeness is a concept central to biodiversity conservation and invasion biology, but there are several problems related to a classic binary nativeness definition. Dilemmas arise from the dynamic nature of species' distribution ranges on longer time scales, and difficulties arise in the application to smaller regions defined by arbitrary borders, and ...
Camilla T. Colding‐Jørgensen, Rasmus Ejrnæs, Jens‐Christian Svenning, Hans Henrik Bruun   +3 more
wiley   +1 more source

Meteorological versus spatial drivers of the spatial synchrony of forest insect pest outbreaks in North America

Oikos, EarlyView.
Spatial synchrony of population fluctuations has major consequences for the impacts of forest insect pest outbreaks at regional scales. We tested the predictions that the strength and drivers of this synchrony would differ among species according to their dispersal abilities and feeding guilds.
Kyle J. Haynes, Deepa S. Pureswaran, Andrew J. Allstadt, Jonathan A. Walter, Ian DeMerchant, Andrew M. Liebhold   +5 more
wiley   +1 more source

Survival of Norway spruce remains higher in mixed stands under a dryer and warmer climate

Global Change Biology, 2015
Shifts in tree species distributions caused by climatic change are expected to cause severe losses in the economic value of European forestland. However, this projection disregards potential adaptation options such as tree species conversion, shorter ...
Susanne Neuner, A. Albrecht, Dominik A. Cullmann, Friedrich Engels, V. Griess, W. Hahn, M. Hanewinkel, F. Härtl, C. Kölling, K. Staupendahl, T. Knoke   +10 more
semanticscholar   +1 more source

Bioclimatic, demographic and anthropogenic correlates of grizzly bear activity patterns in the Greater Yellowstone Ecosystem

Oikos, EarlyView.
Plasticity of diel activity rhythms may be a key element for adaptations of wildlife populations to changing environmental conditions. In the last decades, grizzly bears Ursus arctos in the Greater Yellowstone Ecosystem (GYE) have experienced notable environmental fluctuations, including changes in availability of food sources and severe droughts ...
Aurora Donatelli, Mark A. Haroldson, Justin G. Clapp, Paolo Ciucci, Frank T. van Manen   +4 more
wiley   +1 more source