Dinocysts
Dinocysts or dinoflagellate cysts are typically 15 to 100 µm in diameter and produced by around 15–20% of living dinoflagellates as a dormant, zygotic stage of their lifecycle, which can accumulate in the sediments as microfossils. Organic-walled dinocysts are often resistant and made out of … See more The first person to recognize fossil dinoflagellates was Christian Gottfried Ehrenberg, who reported his discovery in a paper presented to the Berlin Academy of Sciences in July 1836. He had observed clearly tabulate … See more Quaternary dinocysts are typically between 15 and 100 µm in diameter. One of the smallest recent cysts is the cyst of Pentapharsodinium dalei, which can be as small as 19 µm in … See more The walls of organic-walled dinocysts are composed of the resistant biopolymer called dinosporin. This organic compound has similarities to sporopollenin, but is unique to dinoflagellates. In addition to organic-walled cysts, there are also See more Ontologically, the term cyst can apply to (1) a temporary resting state (pellicle, temporary or ecdysal cyst), (2) a dormant zygote (resting cysts or hypnozygotes) or (3) a coccoid … See more Dinoflagellate cysts described in the literature have been linked to a particular motile stage through morphological similarities and/or co-occurrence in the same population/culture or through the technique of establishing the so-called cyst-theca relation … See more In pure morphological terms, a dinocyst can be described as the body formed by the cyst wall, as well as the space it encloses and all … See more There have been very few ultrastructural studies of marine cysts with TEM, except for early on Hystrichosphaea bentorii, on Hystrichosphaeridium, … See more Webсайт Электронной библиотеки Белорусского государственного университета. Содержит полные ...
Dinocysts
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WebMar 9, 2010 · Palynomorphs, especially dinoflagellate cysts (dinocysts), have been at the forefront of research carried out on Mesozoic‐Cenozoic sediments on the Scotian Margin over the last 30–40 years: this research has been driven by the need to develop a stratigraphical framework to better understand the region's petroleum systems. WebDinoflagellate cysts were studied in 42 samples from the surface sediments of the White Sea. The total concentration of dinocysts varies from single cysts to 25 000 cyst/g of dry sediments, which reflects the biological productivity in the White Sea waters and the regional particular features of the sedimentation processes. The highest concentrations are …
WebNational Center for Biotechnology Information WebApr 19, 2013 · Among the early Oligocene protoperidiniacean dinocysts, specimens closely resembling the modern Selenopemphix antarctica [here referred to as S. cf. antarctica are recorded in low-to-moderate abundance (2 to 20%). S. antarctica is the dominant dinocyst taxon in the modern seasonal sea-ice zone of the Southern Ocean (supplementary text) …
WebDinocysts or dinoflagellate cysts are typically 15 to 100 µm in diameter and produced by around 15-20% of living dinoflagellates as a dormant, zygotic stage of their lifecycle, … WebMar 14, 2016 · Detailed Description. Photo of fossil algae (dinocyst). Specimen is about 90 micrometers across.The largest known impact crater in the U.S. lies buried beneath the …
WebOrganic-walled dinocysts recovered from impact-generated deposits in a deep core inside the 85-90 km-wide crater include welded organic clumps and fused, partially melted and bubbled dinocysts unlike any previously observed. Other observed damage to dinocysts consists of breakage, pitting, and folding in various combinations.
WebDinocysts have also proved useful as a proxy for the dinoflagellate contribution to sedimentary organic matter. They consist of organic-walled capsules composed of a highly refractory aliphatic biomacropolymer (dinosporin, Kokinos et al. 1998). Dinocysts protect the cell during the dormancy, or ‘‘hypnozygote’’ phase, of many dinoflagellate pilot truck stop lebanon junction kyWebAug 1, 1994 · Dinocysts provide the basis for biostratigraphic identification of a 20-30 cm K-T transitional interval; calcareous microfossils have not been preserved in the glauconitic beds. Dinocysts also record an earliest Danian transgressive event 10 cm above the transition interval. pilot truck stop los angeles caWebJan 1, 2004 · The detailed study of dinocysts has led to the identification of 82 taxa and a zonation composed of five main dinoflagellate zones has been proposed. The Hapsocysta peridictya Zone marks the... pinhook 2022 flagship bourbonWebDec 20, 2024 · The analysis of brackish-water dinocysts and fresh-water algae in different beds of the Demirkent section indicates gradual freshening of the basin probably due to the sea level fall. In the Pekecik section, the brackish-water dinocysts are found in the lower part that is covered by the lignite-bearing layers without signs of marine influence. pilot truck stop locations in georgiaWebThe Carnian pluvial episode (CPE), often called the Carnian pluvial event, was an interval of major change in global climate that was synchronous with significant changes in Earth's biota both in the sea and on land. It occurred during the latter part of the Carnian Stage, a subdivision of the late Triassic period, and lasted for perhaps 1-2 million years (around … pilot truck stop mount pleasant iowapilot truck stop locations in floridaWebThe Chesapeake Bay impact structure, formed by a comet or meteorite that struck the Virginia continental shelf about 35.5 million years ago, is the focus of an extensive coring project by the U.S. Geological Survey and its cooperators. Organic-walled dinocysts recovered from impact-generated deposits in a deep core inside the 85-90 km-wide … pilot truck stop mount vernon illinois