Results 21 to 30 of about 3,644 (285)

Ion Exchange Resin and Entrapped Candida rugosa Lipase for Biodiesel Synthesis in the Recirculating Packed-Bed Reactor: A Performance Comparison of Heterogeneous Catalysts

Energies, 2023
Ion exchange resins and immobilized lipase as heterogeneous catalysts are used to synthesize biodiesel for alternative fossil fuels. The use of ion exchange resins in the solid and activated phase can ease the separation process.
Ibnu Maulana Hidayatullah, Frederick Soetandar, Pingkan Vanessa Sudiyasa, Patrick Cognet, Heri Hermansyah   +4 more
doaj   +1 more source

First whiteflies from the Eocene amber of Denmark [PDF]

Acta Palaeontologica Polonica
One new genus Gregorites Drohojowska & Szwedo with seven new species of whiteflies (Aleyrodidae) from Eocene amber collected in Denmark are described. All new taxa: Gregorites aegiri, G. bergelmiri, G. skadii, G. bestlae, G. thrymi, G.
Jowita Drohojowska, Joanna Śladowska, Jacek Szwedo   +2 more
doaj   +1 more source

A Review of Bio-Based Adhesives from Primary and Secondary Biomass for Wood Composite Applications

Environmental and Climate Technologies, 2022
Today there is a great demand in the market of wood-based panels like medium density fibreboard (MDF), plywood and oriented strand board (OSB). These boards provide functionality in various industrial fields from building to furniture production. All are
Vamza Ilze, Krigers Guntars, Valters Karlis   +2 more
doaj   +1 more source

Mesozoic fossil resins of Northern Eurasia

Vestnik of Institute of Geology of Komi Science Center of Ural Branch RAS, 2017
M. A. Bogdasarov, null null
openaire   +2 more sources

On wheelerite, a new fossil resin [PDF]

American Journal of Science, 1874
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openaire   +2 more sources

The oldest lagonomegopid spider, a new species in Lower Cretaceous amber from Álava, Spain

Geologica Acta, 2006
The new species Burlagonomegops alavensis (Araneae: Lagonomegopidae) is described from Lower Cretaceous (Aptian) amber from Álava (Basque Country), Spain.
D. PENNEY
doaj   +1 more source

Natural resins

Conservar Património, 2005
A short description of the origin, physical properties, classification and chemical composition of the most abundant natural resins from trees and plants is presented, some of which have been used since immemorial times as adhesives and coatings.
Bárbara Gigante
doaj   +1 more source

From Triassic to moderinity: Raman spectroscopy for differentiation of fossil resins age by age

Научно-технический вестник информационных технологий, механики и оптики
The results of studies of fossil resins of different geological ages and geographic origins are presented. A new method of spectral analysis for differentiation of fossil resins by age from the Triassic period to Modernity is developed.
A. Yu. Zyubin, A. A. Kundalevich, A. S. Zozulya, M. A. Bahdasarau, E. A. Demishkevich, I. G. Samusev   +5 more
doaj   +1 more source

Cenozoic origins of the genus Calliarcys (Insecta, Ephemeroptera) revealed by Micro-CT, with DNA barcode gap analysis of Leptophlebiinae and Habrophlebiinae

Scientific Reports, 2022
Mayflies (Ephemeroptera) are among the oldest pterygote insects, with the earliest fossils dating back to the Late Carboniferous. Within mayflies, Leptophlebiidae are a highly diverse and widespread group, with approximately 140 genera and 640 species ...
Roman J. Godunko, Javier Alba-Tercedor, Michal Grabowski, Tomasz Rewicz, Arnold H. Staniczek   +4 more
doaj   +1 more source

Inverse Vulcanization Through Epoxide Chemistry: A Low Temperature Non‐Olefin Route to Sulfur‐Rich Polymer Networks

Angewandte Chemie, EarlyView.
Epoxide monomers undergo base‐catalyzed ring‐opening copolymerization with elemental sulfur to afford sulfur‐rich polymers under mild conditions. The resulting materials exhibit excellent mechanical performance, strong adhesion (up to 10 MPa on stainless steel), and outstanding reprocessability.
Pan Yang, Youfu Wang, Xinyuan Zhu, Jinhong Jia, Xiaofeng Wu, Tom Hasell   +5 more
wiley   +2 more sources