Relevant bibliographies by topics / Sirius Passet

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Academic literature on the topic 'Sirius Passet'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Sirius Passet"

1

Brooks, Kent. "Sirius Passet, Greenland and the Cambrian Explosion." Geology Today 28, no. 4 (July 2012): 144–46. http://dx.doi.org/10.1111/j.1365-2451.2012.00842.x.

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Boudec, Ange Le, Jon Ineson, Minik Rosing, Lasse Døssing, François Martineau, Christophe Lécuyer, and Francis Albarède. "Geochemistry of the Cambrian Sirius Passet Lagerstätte, Northern Greenland." Geochemistry, Geophysics, Geosystems 15, no. 4 (April 2014): 886–904. http://dx.doi.org/10.1002/2013gc005068.

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Peel, J. S., S. C. Morris, and J. R. Ineson. "A second glimpse of Early Cambrian life: new collections from Sirius Passet, North Greenland." Rapport Grønlands Geologiske Undersøgelse 155 (January 1, 1992): 48–50. http://dx.doi.org/10.34194/rapggu.v155.8180.

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The German mining term lagerstatten, referring to a rock of any composition containing constituents of economic interest, has been widely applied to occurrences of abundant or unusually well preserved fossils (cf. Seilacher et al., 1985). The Middle Cambrian Burgess Shale of western Canada is perhaps the most famous of all fossil-lagerstatt, with many of the approximately 140 known species preserving exquisite details of the soft anatomy of members of a community of organisms that was fossilised more than 500 million years ago (Whittington, 1985: Conway Morris, 1979, 1986; Gould, 1989). Other well known examples include the Upper Cambrian 'Orsten' of southern Sweden, the Lower Devonian Hunsruck Slate and the Jurassic Solnhofen Limestone of Germany (Stürmer et al.. 1980; Muller, 1985; Barthel et al. 1990; summary in Briggs & Crowther, 1990, pp. 266–297). The term can be applied aptly to the Sirius Passet fauna of central North Greenland, where a wealth of exceptionally preserved fossils (e.g. Fig. 1) from tile Lower Cambrian Buen Formation has been recorded from a small locality in western Peary Land, near the south-western end of the broad valley known as Sirius Passet (Fig. 2). The locality yielding the Sirius
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Peel, John S. "A corset-like fossil from the Cambrian Sirius Passet Lagerstätte of North Greenland and its implications for cycloneuralian evolution." Journal of Paleontology 84, no. 2 (March 2010): 332–40. http://dx.doi.org/10.1666/09-102r.1.

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A large (maximum length 80 mm), tubular, corset-like problematic fossil from the early Cambrian (Cambrian Series 2, Stage 3) Sirius Passet Lagerstätte of North Greenland is interpreted as the lorica of an ancestral loriciferan. in addition to the double circlet of 7 plates composing the lorica, Sirilorica carlsbergi new genus, new species also preserves up to six multicuspidate cuticular denticles that are similar in shape to the pharyngeal teeth of priapulid worms, although their location is suggestive of scalids. Whilst traditionally placed as a sister group of priapulid worms within Vinctiplicata (Scalidophora), recent molecular sequence data suggest that loriciferans might be more closely related to nematomorphs. the limited morphological information available from Sirilorica is consistent with this interpretation, placing the Sirius Passet fossil within the total-group of Loricifera, within the Loricifera + Nematomorpha clade.
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Ineson, Jon R., and John S. Peel. "Geological and depositional setting of the Sirius Passet Lagerstätte (Early Cambrian), North Greenland." Canadian Journal of Earth Sciences 48, no. 8 (August 2011): 1259–81. http://dx.doi.org/10.1139/e11-018.

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The Early Cambrian Sirius Passet Lagerstätte of North Greenland occurs in marine mudstones (Buen Formation) deposited in a slope environment along the eroded scarp of a pre-existing carbonate platform. The shallow-water platform is represented by dolostones of the Portfjeld Formation (Neoproterozoic – earliest Cambrian), which record a belt of tide-swept subtidal ooid shoals and microbial patch reefs at the outer edge of the platform. Solution features and meteoric cements attest to exposure of the platform, accompanied by fracturing, mass wastage and erosional retreat of the escarpment producing slope talus, and extensive debris sheets and olistoliths in basinal deposits. The marine mud-dominated siliciclastics of the Buen Formation, deposited in slope and shelf environments, record the transgression and onlap of the degraded platform in the Early Cambrian. The Sirius Passet Lagerstätte has yielded an arthropod-dominated fossil assemblage of over 40 species, many showing exceptional preservation of soft tissues; the finely laminated mudstones hosting this fauna accumulated from suspension in a poorly oxygenated slope sub-environment, such as an erosional embayment or abandoned slope gully. Although taphonomic features suggest that the fauna is mainly parautochthonous, some components (e.g., sponges, worms, the halkieriids and certain sightless arthropods) may be truly autochthonous. Comparison of the Sirius Passet locality with the renowned Middle Cambrian Burgess Shale of western Canada reveals similarities in overall depositional and tectonic setting: both accumulated in deep water adjacent to the steep, eroded margins of carbonate platforms — settings that subsequently sheltered the faunas from tectonic and metamorphic obliteration.
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Botting, Joseph P., and John S. Peel. "Early Cambrian sponges of the Sirius Passet Biota, North Greenland." Papers in Palaeontology 2, no. 4 (June 28, 2016): 463–87. http://dx.doi.org/10.1002/spp2.1048.

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Lagebro, Linda, Martin Stein, and John S. Peel. "A New ?lamellipedian arthropod from the Early Cambrian Sirius Passet Fauna of North Greenland." Journal of Paleontology 83, no. 5 (September 2009): 820–25. http://dx.doi.org/10.1666/09-011.1.

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The Non-Mineralized arthropod described herein is derived from the Sirius Passet fossil conservation deposit of North Greenland (82°47.6,N, 42°13.7ʹW), the oldest locality with exceptional preservation of soft tissues known from the Cambrian of Laurentia (Cambrian Series 2, Stage 3; Nevadella Zone). As such, it is broadly contemporaneous with the Chengjiang fauna of China (Hou et al., 2004) and some 10 million years older than the Burgess Shale fauna of British Columbia. The Sirius Passet fauna was first documented by Conway Morris et al. (1987) and its geological setting is discussed by Babcock and Peel (2007). In addition to the nevadiid trilobite Buenellus higginsi Blaker, 1988, the fauna is dominated by non-mineralized arthropods (Budd, 1993, 1995, 1997, 1999; Williams et al., 1996; Taylor, 2002). Other finds include sponges (Rigby, 1986), a lobopod (Budd and Peel, 1998), the earliest annelids (Conway Morris and Peel, 2008) and articulated halkieriids (Conway Morris and Peel, 1990, 1995), but most of the assemblage awaits description.
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Peel, John S., Sebastian Willman, and Steven J. Hageman. "The oldest hyolithids (Cambrian Series 2, Montezuman Stage) from the Iapetan margin of Laurentia." Journal of Paleontology 94, no. 4 (April 2, 2020): 616–23. http://dx.doi.org/10.1017/jpa.2020.8.

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AbstractThe recent description of the nevadioid trilobite Buenellus chilhoweensis Webster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, Tennessee. The description recognized the oldest known age-diagnostic Cambrian trilobite from the Laurentian margin of the former Iapetus Ocean since Buenellus Blaker, 1988 is known otherwise only from the Sirius Passet Lagerstätte on the Innuitian margin of North Greenland. The bivalved arthropods Isoxys chilhoweanus Walcott, 1890 and Indota tennesseensis (Resser, 1938a) have also been described from the Murray Shale, but hyolithids appear to be the dominant body fossils in terms of diversity and abundance. Although poorly preserved, the hyolithids occurring together with Buenellus chilhoweensis are described to improve understanding of the Murray Shale biota. The hyolith assemblages of the Murray Shale and Sirius Passet Lagerstätte are not closely similar, although the poor preservation of both hinders comparison.
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Williams, Mark, David J. Siveter, and John S. Peel. "Isoxys (Arthropoda) from the Early Cambrian Sirius Passet Lagerstätte, North Greenland." Journal of Paleontology 70, no. 6 (November 1996): 947–54. http://dx.doi.org/10.1017/s0022336000038646.

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The marine offshore shelf mudstones of the Early Cambrian Buen Formation at Sirius Passet, North Greenland, contain a rich Konservat-Lagerstätte which includes abundant well-preserved material of the bivalved arthropod Isoxys volucris new species. The new material confirms Isoxys Walcott, 1890 as a component of the earliest arthropod faunas worldwide. Isoxys species are known from the Early Cambrian of Spain, Siberia, South Australia and Southwest China and also from the Early to Middle Cambrian of Laurentian North America. Isoxys occurs in the Redlichiid, Bigotinid and Olenellid trilobite faunal realms but is restricted to within tropical/subtropical regions, attesting to possible paleolatitudinal controls on its distribution. Isoxys resembles some phyllocarid and bradoriid arthropods but without knowledge of its soft-parts the affinity of the genus remains uncertain.
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Peel, John S., Simon Conway Morris, and Jon R. Ineson. "The Sirius Passet Fauna, an Early Cambrian Lagerstätte from North Greenland." Paleontological Society Special Publications 6 (1992): 233. http://dx.doi.org/10.1017/s2475262200007930.

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The Sirius Passet Fauna of North Greenland is one of the oldest Cambrian lagerstätten from the North American continent. It is known from a single locality in Peary Land (83°N, 40°W), on the shores of the Arctic Ocean, where outer shelf mudstones from the lower part of the Buen Formation (Early Cambrian) yield a rich assemblage of mainly poorly skeletised organisms with preserved soft parts. The steeply-dipping fossiliferous mudstones occur in close proximity to horizontally-bedded platform carbonates of the underlying Portfjeld Formation (Early Cambrian) in a structurally complex terrane. The boundary between the fossiliferous mudstones and the platform carbonates apparently defines the original northern margin of the carbonate platform and is not, as previously suggested, a structural feature, although some minor tectonic modification can not be excluded. Thus, the fossiliferous mudstones were apparently deposited in a transitional slope setting basinward of the shelf edge.As currently known, the Sirius Passet Fauna comprises about 40 species, based on a collection of almost 5,000 slabs collected during brief visits to the isolated locality in 1989 and 1991. Arthropods dominate, with bivalved bradoriids and the trilobite Buenellus higginsi Blaker, 1988 being the numerically most abundant taxa. Weakly skeletised Naraoia-like and Sidneyia-like arthropods often preserve limbs and gills, as do bivalved arthropods similar to Waptia. Choia is the most common of several sponges. Worms include both priapulids and polychaetes, with a large palaeoscolecidan being conspicuous.Fully articulated specimens of halkieriid worms, clad in an armour of hundreds of individual sclerites, are most notable amongst several problematic taxa. Rare specimens of possible onychophorans are also present, while brachiopods, hyoliths and other shelly fossils are rare or absent.The Sirius Passet Fauna seems to show little taxonomic similarity to the Middle Cambrian Burgess Shale of western Canada or the Chengjiang Fauna from the Lower Cambrian of China at the generic level. Together with the latter fauna, however, it confirms both the general picture of Cambrian life presented by the Burgess Shale, and the existence of this great diversity of weakly skeletised arthropods already in the Early Cambrian.
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Dissertations / Theses on the topic "Sirius Passet"

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Budd, Graham Edward. "Cambrian arthropods from North Greenland and their evolutionary significance." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319381.

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Le, Boudec Ange. "Nouvelles méthodes d'extraction du Molybdène et géochimie d'un grand gisement fossilifère Cambrien, le Lagerstätte de Sirius Passet." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00832055.

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Les propriétés géochimiques particulières du molybdène vis-à-vis du potentiel d'oxygénation en milieu aqueux en font un élément particulièrement utilisé pour déterminer le degré d'oxygénation du milieu dans lequel un dépôt a sédimenté. Dans un premier temps, ce travail de thèse présente une alternative aux méthodes d'extraction du molybdène utilisées jusqu'ici. Les principales méthodes de purification couramment utilisées sur échantillons géologiques se décomposent en deux phases : une purification au travers d'une résine anionique, puis une purification au travers d'une résine cationique. La méthode proposée ici, initialement prévue pour permettre des analyses en Sample-Standard-Bracketing (SSB), permet d'isoler quantitativement le molybdène du reste de la matrice géologique en un seul passage sur résine anionique. La purification s'avère également suffisamment efficace pour effectuer des analyses en utilisant la méthode du double-spike. Une comparaison de ces deux méthodes de correction du fractionnement instrumental a permis d'évaluer les limites de l'utilisation du SSB par rapport au double-spike. Dans un second temps, cette chimie a été appliquée dans le cadre d'une étude géochimique approfondie d'un gisement fossilifère extrêmement riche: le Lagerstätte de Sirius Passet situé au nord du Groenland. Associée aux critères paléontologiques, cette étude indique que ces sédiments se sont déposés dans un milieu au moins partiellement oxygéné, sous forme de boues sédimentaires très peu propices aux échanges avec la colonne d'eau. Le contexte paléogéographique, les analyses chimiques et les observations microscopiques suggèrent que ces boues sont principalement d'origine éolienne.
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Books on the topic "Sirius Passet"

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Awesome Super Nintendo Secrets 2. Lahaina, USA: Sandwich Islands Publishing, 1993.

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Awesome Super Nintendo Secrets II. Bournermouth, U.K.: Paragon Publishing, Limited, 1993.

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Book chapters on the topic "Sirius Passet"

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Budd, G. E. "Stem group arthropods from the Lower Cambrian Sirius Passet fauna of North Greenland." In Arthropod Relationships, 125–38. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4904-4_11.

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Saxena, Shipra, Sneha Yogindran, Manmohan Arya, Yogita Sharma, and Chandra Pal Singh. "RNAi-Mediated Control of Lepidopteran Pests of Important Crop Plants." In Moths and Caterpillars. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96429.

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Insects as pests destroy annually an estimated 18–20% of the crop production worldwide. Caterpillars, the larval stage of moths, are the major pests of agricultural products owing to their voracious feeding habits. In the past few decades, the potent methods of insect control, such as insecticides and Bt toxins, have been constrained as a result of health hazards, environmental issues, and development of resistance, after their prolonged application. Thus, there is need to find alternative options to improve plant protection strategies. Recently, RNA interference (RNAi), the post-transcriptional gene-silencing mechanism, has emerged as one of such a novel, sustainable, and environment friendly approaches for insect management and crop protection. RNAi technology relies on selection of a vital insect pest target gene and its expression as a double stranded RNA or stem-loop RNA molecule, which is recognized by the host RNAi machinery and processed into small interfering RNAs (siRNAs) or microRNAs (miRNAs). The siRNA/miRNA along with the RNA-induced silencing complex (RISC) binds to the complimentary mRNA and induce gene silencing at post-transcriptional level. With effective target-gene selection and transgenic plants expressing these precursor RNA molecules, insect pests of various crops have been efficiently managed. In this chapter, we discuss the basic mechanism of RNAi and its application in controlling lepidopteran pests of important crop plants.
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Conference papers on the topic "Sirius Passet"

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Vinther, Jakob, Tae-Yoon S. Park, Arne Nielsen, Jusun Woo, and David A. T. Harper. "SIRIUS PASSET - NEW DATA FROM AN EXCEPTIONAL FOSSIL LAGERSTÄTTE." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-294537.

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Topper, Timothy P., Francesco Greco, Axel Hofmann, Andrew Beeby, Zhifei Zhang, and David A. T. Harper. "CARBON CHARACTERIZATION IN THE SIRIUS PASSET BIOTA AND A GEOTHERMAL GRADIENT THROUGH CAMBRIAN LAGERSTÄTTEN." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305120.

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Marinari, R., M. Tarantino, F. S. Nitti, A. Alemberti, M. Caramello, A. Achilli, R. Ferri, E. Rizzo, and F. Giannetti. "SIRIO: An Experimental Facility for a New Heat Removal System Passively Controlled by Non-Condensable Gases." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82379.

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Heat removal systems are of major importance for both present and future nuclear power plants as they belong to the set of systems devoted to ensure the integrity of the reactor core and to avoid core damage. The past experience and lessons learned on this topic suggest to adopt passive safety systems which can perform the safety function independently from operators’ actions and external energy sources, ensuring long term reactor cooling. Application of these systems to innovative reactor concepts such as (heavy) liquid metal reactors poses a problem related to the characteristic properties of the coolant: as the final heat sink of passive safety systems is often the external environment, the liquid metal will eventually undergo a phase change and solidify at the end of a complex dynamic process. The solidification of the coolant may have important effects on the transient behavior if it happens at an early stage of an accident, as the main flow path of the heat exchanger can be blocked by the coolant freezing while the decay heat in the core is still sufficiently high and need to be efficiently removed. An innovative passive safety system has been proposed for the decay heat removal system of ALFRED reactor (DEMO LFR, Gen.IV) where the issue of early coolant freezing is prevented. The innovation has been object of a patent and the system is potentially able to avoid solidification by reducing the amount of heat removed from the primary system by means of non-condensable gases passively injected into the water/steam mixture, which induce heat transfer degradation. Several numerical studies have been performed during the past years, but a complete validation of the operating principle requires an experimental assessment and characterization. To this aim the SIRIO experimental facility, scaled on the DHR of ALFRED, has been conceived. Several design activities have been performed so far for the development of the facility, such as scaling analysis on the basis of ALFRED DHR to determine the facility size, numerical simulations by means of RELAP5-3D to determine whether the facility is able to reproduce the expected physical phenomena and numerical simulations by means of Ansys CFX to investigate the performance of a heating system simulating the primary system of ALFRED based on a molten salt annulus. The present paper describes the design activities performed and provides insights on the methodologies adopted, as well as the current status of the design of the SIRIO facility.
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