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Anzeige der Dokumente 19-38 von 3020
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A Burmese amber fossil of Radula (Porellales, Jungermanniopsida) provides insights into the Cretaceous evolution of epiphytic lineages of leafy liverworts
(Fossil Record, 2017)DNA-based divergence time estimates suggested major changes in the composition of epiphyte lineages of liverworts during the Cretaceous; however, evidence from the fossil record is scarce. We present the first Cretaceous ... -
A contribution to characterizing and calibrating the pointing control system of the SOFIA telescope
(Univ. Stuttgart, 2009)SOFIA, the Stratospheric Observatory for Infrared Astronomy, is an airborne observatory that will study the universe in the infrared spectrum. A Boeing 747-SP aircraft will carry a 2.5 m telescope designed to make sensitive ... -
A critical review on the process of contaminant removal in Fe0-H2O systems.
(Environmental technology, 2008-08-01)A central aspect of the contaminant removal by elemental iron materials (Fe0 or Fe0 materials) is that reduction reactions are mediated by the iron surface (direct reduction). This premise was introduced by the pioneers ... -
A Dated Holocene Sediment Core from the Bottom of the Southern North Sea
(E&G – Quaternary Science Journal, 1985-01-01)Ein Bohrkern aus der südlichen Nordsee (54° 44,5' N, 4° 30' E) wurde auf Pollen, botanische Makroreste, Mollusken sowie Minerale und Schwermetalle untersucht. Im Liegenden befindet sich ein echter Basistorf, auf den ohne ... -
A fossil species of the enigmatic early polypod fern genus Cystodium (Cystodiaceae) in Cretaceous amber from Myanmar.
(Scientific reports, 2017-11-06)The monospecific fern genus Cystodium (Cystodiaceae; Polypodiales) occurs exclusively in the tropical forests of the Malay Archipelago, the Admiralty Islands, the Louisiade Archipelago, and the Solomon Islands. Divergence ... -
A horizontal gene transfer supported the evolution of an early metazoan biomineralization strategy
(BMC Evolutionary Biology, 2011)Background The synchronous and widespread adoption of the ability to biomineralize was a defining event for metazoan evolution during the late Precambrian/early Cambrian 545 million years ago. However our understanding on ... -
A hydrogeological, hydrochemical and environmental study in Wadi Al Arroub drainage basin, South West Bank, Palestine
(Freiberg Online Geosciences, 2003)Die Arbeit enthält die Ergebnisse von hydrologischen, hydrogeologischen, geomorphologischen und hydrochemischen Studien, die zwischen 1998-2002 im Einzugsgebiet des Wadi Al Arroub durchgeführt wurden. Das Arbeitsgebiet ... -
A Major Coastal Flood During the Holocene in Eastern Scotland
(E&G – Quaternary Science Journal, 1985-01-01)Gehobene holozäne ästuarine Ablagerungen der postglazialen Haupttransgression enthalten in einer Anzahl von Fundpunkten an der Ostküste Schottlands eine charakteristische Schicht vorwiegend aus grauem, glimmerführendem ... -
A new calcitic Sphinctozoan sponge belonging to the demospongiae from the Cassian formation (Lower Carnian; Dolomites, northern Italy) and its phylogenetic relationship
(Geobios, 1987)A new species of a coralline sponge, Cassianothalamia zardinii n. gen. n.sp., from the Lower Carnian Cassian Beds (northern Italy) is described. The new species possesses a secondary thalamid basal skeleton with a ... -
A New Chronostratigraphy of the Late Weichselian Loess Units in Middle Europe based on Thermoluminescence Dating
(E&G – Quaternary Science Journal, 1988-01-01)Diese Untersuchung wurde innerhalb des Verbreitungsgebietes des Eltviller Tuffs (Abb. 1) durchgeführt, wobei die Tephralage sowie ein fossiler Boden (E4-Naßboden + Innerwürmboden II + Nagelbeek-Kryoturbationszungenhorizont ... -
A new interpretation of the sedimentary cover in the western Siljan Ring area, central Sweden, based on seismic data
(Tectonophysics, 2012)Two new reflection seismic profiles over the Paleozoic successions of the western part of the Siljan Ring impact structure show a contrasting seismic signature. The more southerly c. 10 km long Mora profile reveals a highly ... -
A note on world precipitation during the last glaciation
(E&G – Quaternary Science Journal, 1965-12-31)72% der Gesamt-Niederschläge auf der Erde fallen zwischen den Breitengraden 40° N und 40° S. Unter der Voraussetzung, daß während der letzten Eiszeit die Verdunstung — und damit die Niederschläge — 20% niedriger waren als ... -
A Numerical Model of Tracer Transport in a Non-isothermal Two-Phase Flow System for CO2 Geological Storage Characterization
(Transport in Porous Media, 2013) -
A permafrost glacial hypothesis – Permafrost carbon might help explaining the Pleistocene ice ages
(E&G – Quaternary Science Journal, 2012-05-11)Während der letzten ~100 ka Glazial-Interglazial-Zyklen war die Konzentration des Treibhausgases CO2 in der Atmosphäre eng mit der globalen Temperatur gekoppelt. Die Gründe fuür die CO2 Konzentrationsschwankungen wurden ... -
A problematic microfossil from the Oligocene of Rott (Siebengebirge, Germany), with affinities to freshwater Bryozoan Statoblasts (Phylactolaemata)
(Beiträge zur Paläontologie, 1991) -
A rapidly evolving secretome builds and patterns a sea shell
(BMC biology, 2006)Background: Instructions to fabricate mineralized structures with distinct nanoscale architectures, such as seashells and coral and vertebrate skeletons, are encoded in the genomes of a wide variety of animals. In mollusks, ... -
A Rare Glimpse of Paleoarchean Life: Geobiology of an Exceptionally Preserved Microbial Mat Facies from the 3.4 Ga Strelley Pool Formation, Western Australia.
(PloS one, 2016)Paleoarchean rocks from the Pilbara Craton of Western Australia provide a variety of clues to the existence of early life on Earth, such as stromatolites, putative microfossils and geochemical signatures of microbial ...