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    Tytuł:
    A symbiotic association of a boring polychaete and an echinoid from the Late Cretaceous of Germany
    Autorzy:
    Wisshak, M.
    Neumann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/21643.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Germany
    Cretaceous
    Late Cretaceous
    trace fossil
    fossil
    polychaete
    Polychaeta
    Spionidae
    bioerosion
    Maastrichtian
    symbiotic association
    echinoid
    Caulostrepsis
    Polydora
    Echinocorys
    Opis:
    From the Early Maastrichtian white chalk of Rügen Island (N Germany), a specimen of the echinoid Echinocorys ovata featuring 27 boring traces of the ichnogenus Caulostrepsis is described. Individual traces are shallow to moderately deep U−shaped depressions and show distinct regeneration textures evidencing a syn−vivo infestation. All traces are located on the plastron between the peristome and periproct of the host echinoid, indicating an adaptation of the trace maker by choosing the most advantageous position of the specific host. The traces are attributed to the work of boring spionid polychaetes (Polydora complex), grounded on the close morphological resemblance with initial borings of Recent polydorids. This is the first evidence for a possible association of a boring polychaete not only with an echinoid but with an echinoderm in general. The symbiotic relationship was commensalistic in nature with the spionid probably taking advantage of organic matter resuspended by the echinoids locomotion and feeding activity and benefiting from effective shelter. For the host echinoid, the association was moderately harmful. The soft bottom environment of the chalk sea provided very limited hard substrate ecospace for settlers and bioeroders, available only in form of biogenic structures. Echinocorys was a dominant component of this benthic community and can be considered as a suitable host for symbiotic interactions because of its size and assumed longevity.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Centrichnus eccentricus revisited: a new view on anomiid bivalve bioerosion
    Autorzy:
    Neumann, C.
    Wisshak, M.
    Aberhan, M.
    Girod, P.
    Rosner, T.
    Bromley, R.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22619.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Saddle oysters (Anomiidae) attach themselves to calcareous hard substrates by means of a calcified byssus that etches an attachment structure, referred to as ichnospecies Centrichnus eccentricus. Examination of rich material from the Late Cretaceous of central Europe extends the fossil record of this ichnotaxon and revealed a set of previously unrecognised morphological features which appear to be typical for this time period and the respective anomiid trace maker. Excellent preservation of a large number of trace fossil specimens with a complete set of morphological characters allowed a biometrical analysis and additional observations indicating a distinct substrate preference for belemnite rostra, a strong intra- and interspecific competition for settlement space, as well as interactions with durophaguous predators. Further implications for anomiid palaeobiology and palaeoecology arise from allometric shell growth and an etched outline suture in the substrate along the dorsal, lateral and ventral shell margins. These features enhanced a firm attachment and increased shear resistance, and thus are interpreted as an effective defence mechanism against shell-crushing enemies under the intensified predation pressure in marine environments in the Late Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the influence of temperature and water level of the reservoir about the displacement of a concrete dam
    Autorzy:
    Oro, S. R.
    Mafioleti, T. R.
    Chaves Neto, A.
    Garcia, S. R. P.
    Neumann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/264428.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    zapora betonowa
    analiza wieloczynnikowa
    monitorowanie strukturalne
    structural monitoring
    concrete dam
    multivariate analysis
    Opis:
    Multivariate techniques are used in this study to analyze the monitoring data displacements of a concrete dam, measured by means of pendulums, extensometer bases and multiple rod extensometers, taking into account the action of environmental conditions, bounded by the surface temperature of the concrete at ambient temperature and the tank water level. The canonical correlation analysis is used to evaluate the influence of environmental variables in the displacement of structures and dam foundations. The factor analysis is used to identify data sources of variability and order the sensors according to the action of factors. The dates of the measurements are grouped according to similarities in the present observations, by applying the cluster analysis. Then the discriminant analysis is used to assess the groups as to their homogeneity. The results demonstrate that the techniques used for distinguishing the dam responses and identify the effects of changes in environmental conditions on the displacements of the structures and dam foundations.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 107-120
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying the oldest larva of a myrmeleontiformian lacewing-a morphometric approach
    Autorzy:
    Herrera-Florez, A.F.
    Braig, F.
    Haug, C.
    Neumann, C.
    Wunderlich, J.
    Hornig, M.K.
    Haug, J.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082151.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Insecta
    Myrmeleontidae
    Ascalaphidae
    compression fossil
    fossil larva
    Cretaceous
    Crato Formation
    Brazil
    Opis:
    Neuroptera is one of the smaller ingroups of Holometabola, the ingroup of Insecta characterised by “complete” metamorphosis. Neuroptera comprises about 6000 species in the modern fauna, but appears to have been more diverse in the past. While adults distantly resemble certain moths or damselflies, the larval forms of Neuroptera are mostly fierce predators with prominent venom-injecting stylets. The most well-known of these larvae are probably those of antlions. Antlions and their closer relatives (silky lacewings, split-footed lacewings, ribbon-winged lacewings, spoon-winged lacewings, and owlflies) form a distinct monophyletic ingroup of Neuroptera, Myrmeleontiformia, hence the antlion-like forms. The fossil record of antlion-like larvae dates back far into the Cretaceous; many forms are known by exceptionally wellpreserved specimens entrapped in amber. The oldest fossil record of a neuropteran larva (not an antlion-like form) comes from Lebanese amber. Interestingly, the supposedly oldest record of an antlion-like larva is preserved in rock and comes from the famous Lower Cretaceous Crato Formation. We re-evaluate this fossil based on high-resolution composite photography. Due to the non-availability of many key characters, standard procedures for identifying the specimen to a more narrow ingroup remains challenging. Therefore, we used a morphometric approach. A combination of non-metric multidimensional scaling (NMDS), parallel coordinate plots and discriminant function analysis indicates that the fossil is a representative of the group Ascalaphidae (owlflies) + Myrmeleontidae (antlions). We discuss implications of this result for the fossil record of neuropteran larvae. These include the rather derived morphology of the oldest fossil larva of Myrmeleontiformia in contrast to previous expectations. Furthermore, fossils from soil dwellers can not only be expected to be found in amber, but also as compression fossils.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 2; 235-250
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In defence of an iconic ichnogenus : Oichnus Bromley
    Autorzy:
    Wisshak, M.
    Kroh, A.
    Bertling, M.
    Knaust, D.
    Nielsen, J. K.
    Jagt, J. W. M.
    Neumann, C.
    Nielsen, K. S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/191852.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    ichnology
    ichnotaxonomy
    Oichnus
    Tremichnus
    Sedilichnus
    bioerosion
    predation
    Opis:
    By establishing the bioerosion ichnogenus Oichnus, Richard Bromley (1981) addressed ‘small round holes in shells’ and catalysed a series of still ongoing discussions on ichnotaxonomical principles. In a recent revision by Zonneveld and Gingras (2014), Oichnus was rejected, together with Tremichnus Brett, 1985 and Fossichnus Nielsen, Nielsen and Bromley, 2003, by means of subjective synonymisation with the presumed senior synonym Sedilichnus Müller, 1977. However, Sedilichnus is nomenclaturally unavailable, because it is an atelonym (conditionally proposed). In addition, reinvestigation of the type material of ‘Sedilichnus’ shows that it probably describes variably shaped oscula and thus is a genuine morphological character of the host sponge Prokaliapsisjanus, rather than a bioerosion trace fossil. The ichnogenera Oichnus and Tremichnus are re vised, leading to the synonymisation of Balticapunctum Rozhnov, 1989 with Tremichnus, and of Fossichnus with Oichnus. The refined ichnogeneric diagnoses return Oichnus to complete or incomplete bioerosive penetrations in calcareous skeletal substrates, commonly interpreted as praedichnia with or without signs of attachment, while Tremichnus (now including O. excavatus) exclusively refers to shallow pits passing into echinoderm skeletons that are interpreted as domichnia or fixichnia.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 3; 445-451
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2D Electron Gas in Non-Uniform Magnetic Fields
    Autorzy:
    Gallagher, B. L.
    Kubrak, V.
    Rushforth, A.
    Neumann, A. C.
    Edmonds, K. W.
    Main, P. C.
    Henini, M.
    Marrows, C. H.
    Hickey, B. J.
    Thoms, S.
    Dahlberg, D. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014148.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.Jt
    73.20.Dx
    73.23.Ad
    73.50.Fq
    Opis:
    We present a review of some of our recent experimental work on hybrid ferromagnet/semiconductor devices in which 2D electrons propagate through magnetic barriers, periodic magnetic modulations, and random magnetic fields.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 217-230
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced microstructure diagnostics and interface analysis of modern materials by high-resolution analytical transmission electron microscopy
    Autorzy:
    Neumann, W.
    Kirmse, H.
    Hausler, I.
    Mogilatenko, A.
    Zheng, C.
    Hetaba, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/199872.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron microscopy
    energy dispersive X-ray spectroscopy
    electron energy loss spectroscopy
    electron holography
    Opis:
    Transmission electron microscopy (TEM) is a powerful diagnostic tool for the determination of structure/property relationships of materials. A comprehensive analysis of materials requires a combined use of a variety of complementary electron microscopical techniques of imaging, diffraction and spectroscopy at an atomic level of magnitude. The possibilities and limitations of quantitative TEM analysis will be demonstrated for interface studies of the following materials and materials systems: Nickel-based superalloy CMSX-10, (Zn,Cd)O/ZnO/Al2O3, (Al,Ga)N/AlN/Al2O3, GaN/LiAlO2 and FeCo-based nanocrystalline alloys.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 237-253
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat shock protein 70 (HSP70) in gastric adaptation to aspirin in Helicobacter pylori infection
    Autorzy:
    Konturek, J.W.
    Fischer, H.
    Konturek, P.C.
    Huber, V.
    Boknik, P.
    Luess, H.
    Neumann, J.
    Brzozowski, T.
    Schmitz, W.
    Hahn, E.G.
    Domschke, W.
    Konturek, S.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/69242.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    infection
    protein 70
    gastric adaptation
    heat shock
    gastric mucosa
    aspirin
    Helicobacter pylori
    Źródło:
    Journal of Physiology and Pharmacology; 2001, 52, 1
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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