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10 rezultatima
Arthropods in modern resins reveal if amber accurately recorded forest arthropod communities.
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Amber is an organic multicompound derivative from the polymerization of resin of diverse higher plants. Compared with other modes of fossil preservation, amber records the anatomy of and ecological interactions between ancient soft-bodied organisms with exceptional fidelity. However, it is currently
Unravelling the Mystery of "Madagascar Copal": Age, Origin and Preservation of a Recent Resin
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The loss of biodiversity during the Anthropocene is a constant topic of discussion, especially in the top biodiversity hotspots, such as Madagascar. In this regard, the study of preserved organisms through time, like those included in "Madagascar copal", is of relevance. "Madagascar copal"
Raman spectroscopic analysis of a tembetá: a resin archaeological artefact in need of conservation.
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The Raman spectroscopic analysis of a Brazilian tembetá, a lip-plug which signifies the attainment of manhood in tribal cultures, and dated to about 1600 years BP is reported. Tembetá are usually made of wood or stone but this lip-plug is very rare in that it is made of resin, which has been
DNA from resin-embedded organisms: Past, present and future
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Past claims have been made for fossil DNA recovery from various organisms (bacteria, plants, insects and mammals, including humans) dating back in time from thousands to several million years BP. However, many of these recoveries, especially those described from million-year-old amber (fossil
Bulk carbon, oxygen, and hydrogen stable isotope composition of recent resins from amber-producing Hymenaea.
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Resins of Hymenaea, an angiosperm tree genus known to be a copious resin producer and a major source of amber since the Oligo-Miocene, were collected from a wide range of tropical environments from Latin America and Africa, and analyzed for their carbon, hydrogen, and oxygen stable isotope
Morphological analyses suggest a new taxonomic circumscription for Hymenaea courbaril L. (Leguminosae, Caesalpinioideae).
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Hymenaea is a genus of the Resin-producing Clade of the tribe Detarieae (Leguminosae: Caesalpinioideae) with 14 species. Hymenaea courbaril is the most widespread species of the genus, ranging from southern Mexico to southeastern Brazil. As currently circumscribed, Hymenaea courbaril is a polytypic
Behavior of Hymenaea courbaril When Its Predispersal Seed Predator Is Absent.
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Members of lowland Costa Rican forest populations of Hymenaea courbaril (Leguminosae) have longer intervals between seed crops, a later age at first reproduction, larger seed crops, and more resin in the pod walls than do the H. courbaril native to Puerto Rico. The primary predispersal seed
High-performance liquid chromatographic purification of oligomeric procyanidins, trimers up to nonamers, derived from the bark of Jatoba (Hymenaea courbaril).
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Procyanidin oligomers with different degrees of polymerization (up to nonamers) were efficiently purified from the bark of Jatoba (Hymenaea courbaril) by using a recently developed chromatographic separation method. Purification relied on a hydrogen bonding interaction between phenolic hydroxyl
Quesnoin, a novel pentacyclic ent-diterpene from 55 million years Old Oise Amber.
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Amber, fossilized tree resin, found at the Oise River area of the Paris basin (France) was dated as being 55 million years old. Quesnoin, a novel unique pure organic compound, was isolated from Oise amber. 1H and 13C NMR spectroscopic analysis indicated an unknown diterpene skeleton, quesnane. The
Resprouting from roots in four Brazilian tree species.
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Previous studies pointed out that species richness and high density values within the Leguminosae in Brazilian forest fragments affected by fire could be due, at least partially, to the high incidence of root sprouting in this family. However, there are few studies of the factors that induce root
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