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    Wyświetlanie 1-3 z 3
    Tytuł:
    Aragonitic rostra of the Turonian belemnitid Goniacamax: arguments from diagenesis
    Autorzy:
    Dauphin, Y
    Williams, C.T.
    Barskov, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/20211.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Turonian
    sea shell
    Cephalopoda
    belemnite
    calcite
    Goniocamax
    rostrum
    skeleton
    sea cephalopod
    diagenesis
    paleoenvironment
    freshwater shell
    Belemnitida
    aragonite
    Siberia
    belemnitid rostrum
    Piasina River
    paleontology
    Opis:
    The hypothesis that belemnitid rostra are formed by primary biogenic low−Mg calcite is widespread. However, the coexistence in the same rostrum of both aragonitic and calcitic components has been reported in true belemnites (Goniocamax, Turonian). A combined microstructural and chemical composition study of the comparison of shells with undisputed mineralogy from the same site as the Turonian Goniocamax, shows that these aragonitic shells display the effects of diagenetic alteration. These observations favour the hypothesis that belemnite rostra are composed of primary aragonite, rather than low−Mg calcite, and are consistent with all other cephalopod shells. Calcitic and aragonitic rostra are also known in other Dibranchiata such as Triassic Aulacocerida and Eocene Belopterina. Diagenetic changes such as shown here may clearly affect palaeo−environmental interpretations based on carbonate shells.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cephalopods - unknown world of oceanic depths
    Autorzy:
    Samek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/83770.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    cephalopod
    oceanic depth
    sea
    ocean
    living organism
    depth
    fauna
    Źródło:
    Folia Malacologica; 2016, 24, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Trace Metal Concentrations in Three Seafood Deep-Sea Fished Caught in the Moroccan Atlantic
    Autorzy:
    Akhouchal, Ihya
    Ait Alla, Aicha
    Hajji, Sara
    Agnaou, Mustapha
    Moukrim, Abdellatif
    Powiązania:
    https://bibliotekanauki.pl/articles/1955583.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    cephalopod
    shrimp
    fish
    metallic trace element
    deep sea fishing
    food safety
    validation of control measure
    Opis:
    The investigation within the framework of this study was carried out on three marine species fished off in Moroccan coasts, namely: a fish, the sole (Solea Vulgaris), a cephalopod, the cuttlefish (Sepia Officinalis) and a crustacean, the pink shrimp (Parapenaeus Longirostris). The aims of this study were assessing the level of concentration in these three marine species, of three metallic trace elements: lead (Pb), cadmium (Cd) and mercury (Hg) and giving a reflection on the way in which Moroccan deep-sea fishing professionals can join a food safety management system to ensure the safety of their product and promote their competitiveness. Sampling was carried out at the port of Agadir city after landing of the deep-sea fishing boats which operate beyond 10 nautical miles, offshoring the seabed of Agadir for pink shrimp (Parapenaeus Longirostris), and in Dakhla city offshore for sole (Solea Vulgaris) and cuttlefish (Sepia Officinalis). Trace metal analysis was performed on individual muscles belonging to the three species. The results of the conducted investigations show that the Pb content varies between 0.01 ppm and 0.27 ppm in Solea Vulgaris; between 0.015 ppm and 0.16 ppm in Sepia Officinalis and between 0.022 ppm and 0.38 ppm for Parapenaeus Longirostris. For Cd, the concentrations vary between 0.0047 ppm and 0.050 ppm in Solea Vulgaris; between 0.0025 ppm and 0.254 ppm in Sepia Officinalis and between 0.0065 ppm and 0.11 ppm in Parapenaeus Longirostris. Concerning Hg, the contents vary between 0.0006 ppm and 0.075 ppm in Solea Vulgaris; between 0.0008 ppm and 0.05 ppm in Sepia Officinalis and between 0.0016 ppm and 0.09 ppm in Parapenaeus Longirostris. It appears from this study that the metal contents detected at the level of the three species of seafood investigated are below the regulatory thresholds. These results can be considered as the first basis for validating the control measure linked to the absence of metallic contamination of the three species in the sites studied.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 9; 87-98
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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