Results 21 to 30 of about 836,969 (319)

Palynostratigraphy and palynofacies of the early Eocene Gurha lignite mine, Rajasthan, India [PDF]

open access: yes, 2016
A 105 m early Eocene section exposed in the Gurha mine in the Nagaur-Ganganagar Basin, Rajasthan, India, archiving remains of equatorial vegetation at a time of extreme global warmth and close to the onset of the India-Eurasia collision, is investigated ...
Aggarwal   +50 more
core   +1 more source

Species-level determination of closely related araucarian resins using FTIR spectroscopy and its implications for the provenance of New Zealand amber [PDF]

open access: yesPeerJ, 2015
Some higher plants, both angiosperms and gymnosperms, can produce resins and some of these resins can polymerize and fossilize to form ambers. Various physical and chemical techniques have been used to identify and profile different plant resins and have
Leyla J. Seyfullah   +2 more
doaj   +2 more sources

Amber imitation? Two unusual cases of Pinus resin-coated beads in Iberian Late Prehistory (3rd and 2nd millennia BC) [PDF]

open access: yes, 2019
A group of beads from the artificial cave of La Molina (Lora de Estepa, Sevilla) and Cova del Gegant (Sitges, Barcelona) were made from a biogenic raw material and intentionally covered by a layer of resin.
Avilés Escaño, Miguel Ángel   +5 more
core   +2 more sources

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

open access: yesEnergies, 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   +4 more
doaj   +1 more source

Early Miocene coastal taphonomy: piddock and barnacle inclusions from Chiapas amber [PDF]

open access: yesActa Palaeontologica Polonica
Piddocks (Pholadidae) are bivalves adapted for boring in substrates such as wood, rocks, and fossil resins. While the trace fossils associated with their boring behavior (Teredolites and Apectoichnus) are well documented, their body fossils are much ...
Błażej Bojarski   +2 more
doaj   +1 more source

Variations of radiocarbon in tree rings: southern hemisphere offset preliminary results [PDF]

open access: yes, 1998
The Queen's University of Belfast, Northern Ireland and University of Waikato, Hamilton, New Zealand radiocarbon laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus patrea ...
Baillie, Mike G.L.   +8 more
core   +2 more sources

The Bruneian record of “Borneo Amber”: A regional review of fossil tree resins in the Indo-Australian Archipelago

open access: yesEarth-Science Reviews, 2020
In this study we intend to provide an overview on fossilized tree resins (amber) commonly found in Southeast Asia, more particularly in the Indo-Australian Archipelago (IAA).
L. Kocsis   +9 more
semanticscholar   +1 more source

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

open access: yesEnvironmental 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   +2 more
doaj   +1 more source

Wood polymer composites and their contribution to cascading utilisation [PDF]

open access: yes, 2015
Due to a shortage of resources and a growing competition of land use, sustainable and efficient resource utilisation becomes increasingly important.
Krause, Andreas   +4 more
core   +1 more source

First whiteflies from the Eocene amber of Denmark [PDF]

open access: yesActa 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   +2 more
doaj   +1 more source

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