Results 11 to 20 of about 22,106 (292)

Organic Geochemistry of Fossil Resins from the Czech Republic

open access: yesProcedia Earth and Planetary Science, 2014
AbstractFive fossil resins from various localities in the Czech Republic were investigated. To arrive at more detailed description of the resins, pyrolysis-gas chromatography/mass spectrometry with derivatisation using tetramethylammonium hydroxide, gas chromatography-mass spectrometry, and micropetrography were applied. The content of organic macerals,
Havelcová, Martina   +3 more
openaire   +3 more sources

Biomarkers in fossil resins and their palaeoecological significance

open access: yesEarth-Science Reviews, 2023
Jan Pańczak   +2 more
openaire   +3 more sources

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   +5 more sources

Process Superstructure Optimization for Resin and Aromatic Monomer Production from Kraft Lignin

open access: yesChemical Engineering Transactions, 2021
Kraft lignin conversion to value-added products is an alternative way to manage the main pulp and paper secondary stream thus contributing to reducing avoid greenhouse gas emissions compared to equivalent fossil-based processes.
Christos Galanopoulos   +4 more
doaj   +1 more source

Challenges encountered during acid resin transfer preparation of fossil fish from Monte Bolca, Italy [PDF]

open access: yes, 2015
Copyright: Palaeontological Association May 2015. This is an open access article, available to all readers online, published under a creative commons licensing (https://creativecommons.org/licenses/by/4.0/). The file attached is the published version
Allington-Jones, L, Graham, M
core   +1 more source

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

A review of amber and copal occurrences in Africa and their paleontological significance

open access: yesBSGF - Earth Sciences Bulletin, 2020
The paleontological interest for fossil plant resins (amber and copal) has greatly increased in the last decades, as field studies have resulted in the discovery of various new deposits worldwide.
Bouju Valentine, Perrichot Vincent
doaj   +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

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

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

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