The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Zhen Maoquan - One of the best experts on this subject based on the ideXlab platform.
-
theory on guidance of heat melted salt of Triassic Period in search of potash in sichuan basin
Journal of Salt Lake Research, 2002Co-Authors: Zhen MaoquanAbstract:s:The Sichuan Basin is rich with salt and brine resources.This paper discusses the Triassic marine salt and its derivatives after heat melting and water soluting.points out its application in search of potash which gave a new way for searching potash in Sichuan Basin.
David A. Grimaldi - One of the best experts on this subject based on the ideXlab platform.
-
arthropods in amber from the Triassic Period
Proceedings of the National Academy of Sciences of the United States of America, 2012Co-Authors: Alexander R Schmidt, Saskia Jancke, Evert E Lindquist, Eugenio Ragazzi, G Roghi, Paul C Nascimbene, Kerstin Schmidt, Torsten Wappler, David A. GrimaldiAbstract:The occurrence of arthropods in amber exclusively from the Cretaceous and Cenozoic is widely regarded to be a result of the production and preservation of large amounts of tree resin beginning ca. 130 million years (Ma) ago. Abundant 230 million-year-old amber from the Late Triassic (Carnian) of northeastern Italy has previously yielded myriad microorganisms, but we report here that it also preserves arthropods some 100 Ma older than the earliest prior records in amber. The Triassic specimens are a nematoceran fly (Diptera) and two disparate species of mites, Triasacarus fedelei gen. et sp. nov., and Ampezzoa Triassica gen. et sp. nov. These mites are the oldest definitive fossils of a group, the Eriophyoidea, which includes the gall mites and comprises at least 3,500 Recent species, 97% of which feed on angiosperms and represents one of the most specialized lineages of phytophagous arthropods. Antiquity of the gall mites in much their extant form was unexpected, particularly with the Triassic species already having many of their present-day features (such as only two pairs of legs); further, it establishes conifer feeding as an ancestral trait. Feeding by the fossil mites may have contributed to the formation of the amber droplets, but we find that the abundance of amber during the Carnian (ca. 230 Ma) is globally anomalous for the pre-Cretaceous and may, alternatively, be related to paleoclimate. Further recovery of arthropods in Carnian-aged amber is promising and will have profound implications for understanding the evolution of terrestrial members of the most diverse phylum of organisms.
-
a Triassic lagerstatte from eastern north america
Nature, 1996Co-Authors: Nicholas C Fraser, Paul E Olsen, David A. Grimaldi, Brian J AxsmithAbstract:THE end of the Triassic Period is pivotal in the evolution of modern ecosystems1. Despite this, the Triassic remains one of the poorest known Periods in the evolutionary history of the terrestrial arthropods. Here we report on fossiliferous shales preserving a nearly complete marginal lacustrine community from the Virginia–North Carolina border that sheds considerable light on this critical interval. Three species of insect were previously described from this locality, but the full extent and significance of its diversity have only now been discovered: we report here the oldest definitive records for three orders of insect and numerous families and super families. Furthermore, in addition to new taxa, the flora is shown to contain an unusual diversity of forms, some of which have only been previously reported either from Europe or the Southern Hemisphere. The abundance of complete insects and the preservation of soft-part anatomy on some of the vertebrates elevates the site to one of the most significant Lagerstatte in the world.
Zhiming Dong - One of the best experts on this subject based on the ideXlab platform.
-
a polydactylous amniote from the Triassic Period
Nature, 2003Co-Authors: Xiaochun Wu, Zhan Li, Baochun Zhou, Zhiming DongAbstract:The earliest four-limbed vertebrates, or tetrapods, lived between 370 million and 354 million years ago, during the Late Devonian Period, and typically had more than five digits (polydactyly)1. We have discovered that a preaxial form of polydactyly, in which extra digits are positioned anterior to the first digit, has unexpectedly re-emerged in a marine reptile from the Early Triassic Period about 242 million years ago — the overall morphology of both the manus and pes closely resemble those of the earliest tetrapods. Until now, no post-Devonian tetrapod has been found with a comparative type of polydactyly, so the new amniote provides a striking example of convergent evolution.
Brendan Gilmore - One of the best experts on this subject based on the ideXlab platform.
-
characterisation of a solvent tolerant haloarchaeal r selective transaminase isolated from a Triassic Period salt mine
Applied Microbiology and Biotechnology, 2019Co-Authors: Stephen A Kelly, Damian Magill, Julianne Megaw, Timofey Skvortsov, Thorsten Allers, John W Mcgrath, Christopher C R Allen, Thomas S Moody, Brendan GilmoreAbstract:Transaminase enzymes (TAms) are becoming increasingly valuable in the chemist’s toolbox as a biocatalytic route to chiral amines. Despite high profile successes, the lack of (R)-selective TAms and robustness under harsh industrial conditions continue to prove problematic. Herein, we report the isolation of the first haloarchaeal TAm (BC61-TAm) to be characterised for the purposes of pharmaceutical biocatalysis. BC61-TAm is an (R)-selective enzyme, cloned from an extremely halophilic archaeon, isolated from a Triassic Period salt mine. Produced using a Haloferax volcanii–based expression model, the resulting protein displays a classic halophilic activity profile, as well as thermotolerance (optimum 50 °C) and organic solvent tolerance. Molecular modelling predicts the putative active site residues of haloarchaeal TAms, with molecular dynamics simulations providing insights on the basis of BC61-TAm’s organic solvent tolerance. These results represent an exciting advance in the study of transaminases from extremophiles, providing a possible scaffold for future discovery of biocatalytic enzymes with robust properties.
Maria Barbacka - One of the best experts on this subject based on the ideXlab platform.
-
Palaeoenvironment of the Late Triassic (Rhaetian) and Early Jurassic (Hettangian) Mecsek Coal Formation (south Hungary): implications from macro- and microfloral assemblages
Palaeobiodiversity and Palaeoenvironments, 2011Co-Authors: Annette E. Götz, Katrin Ruckwied, Maria BarbackaAbstract:The changes in early Mesozoic land plant communities, their vegetation patterns and vegetation dynamics are still only poorly understood, mainly because of the lack of integrated studies on fossil plant macroremains and palynomorphs. The Early Jurassic represents a major recovery phase of marine and terrestrial ecosystems after one of the biggest mass extinction events in Earth’s history at the end of the Triassic Period. The present study focuses on the southern Hungarian Mecsek Coal Formation of Late Triassic (Upper Rhaetian) to Early Jurassic (Hettangian) age, which has yielded unique plant fossils and diverse palynomorph assemblages which are used to study floral changes within a phase of ecological recovering. The Hungarian coal-bearing series of the Mecsek Mountains are seen to represent key sections for analysing regional changes in land plant communities and also to detect the influence of global climatic change. Furthermore, the cyclic sedimentation of the Mecsek Coal Formation enables a high time resolution of the processes, thus leading to a better understanding of the “beat” in floral changes.
