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Wyszukujesz frazę "Kulicki, K." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Cephalopod arm hooks from the Jurassic of Poland
    Haczyki głowonogów z jury Polski
    Krjuchochki golovnogikh molljuskov iz jury Polshi
    Autorzy:
    Kulicki, C.
    Szaniawski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/20575.pdf
    Data publikacji:
    1972
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Źródło:
    Acta Palaeontologica Polonica; 1972, 17, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precursory siphuncular membranes in the body chamber of Phyllopachyceras and comparisons with other ammonoids
    Autorzy:
    Tanabe, K
    Kulicki, C.
    Landman, N.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/22378.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Ammonoidea
    Late Cretaceous
    organic membrane
    scanning electron microscopy
    morphogenesis
    Hokkaido
    body chamber
    Japan
    chamber formation
    Phyllopachyceras ezoense
    septal epithelium
    paleontology
    Phyllopachyceras
    ammonoid
    Opis:
    Organic membranes preserved in the rear part of the body chamber of the Late Cretaceous phylloceratid ammonite Phyllopachyceras ezoense were examined with scanning electron microscopy (SEM) on the basis of well−preserved specimens from Hokkaido, Japan. SEM observations revealed that the membranes are continuous with the siphuncular tube wall in the phragmocone and consist of two layers, both of which are made of a dark, primarily conchiolin material; namely, a thinner inner homogeneous layer and a thicker outer layer with gently inclined pillar−like units. Hence, they are interpreted as the precursory siphuncular membranes. The precursory siphuncular membranes are not associated with any other organic components such as the siphuncular sheets reported in some Paleozoic and Mesozoic ammonoids. Unlike the tube−like condition in the phragmocone, the precursory siphuncular membranes in the body chamber of the specimens examined do not form a tube shape; on the ventral side the membranes are truncated and directly contact the outer shell wall. These observations suggest that the inner and outer layers of the precursory siphuncular membranes in the body chamber were respectively formed by the siphuncular epithelium from the inner side and by the invaginated septal epithelium from the outer side. It is also postulated that at the initial stage of septal formation, the rear part of the body moved slowly forward, developing a circumsiphonal invagination of the septal epithelium. Because similar conchiolin membranes are occasionally preserved in the body chambers of other phylloceratids, the above morphogenetic process applies to all members of the Phylloceratina. The tube−shaped structure in the rear part of the body chamber of desmoceratid Damesites consists only of nacreous layer. We interpret it as a pathologically overgrown prochoanitic septal neck.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primary structure of the connecting ring of ammonoids and its preservation
    Autorzy:
    Kulicki, C.
    Tanabe, K.
    Landman, N.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/20506.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ammonite
    ammonoid
    hydrostatic organ
    mineral segment
    nautiloid
    organic segment
    tube
    calcium phosphate
    fossilization
    Opis:
    The most distinctive and important element of the hydrostatic organ of ammonoids and nautiloids is the siphuncular tube. It consists of mineral and organic segments (so−called connecting rings). The connecting ring of ammonites never preserves its original organic matter in the mineralized state, usually having undergone diagenetic phosphatisation, more rarely, calcification, or even complete loss. Our knowledge about its original ultrastructure is based upon comparison with Recent Nautilus and phosphatised or calcified ammonite fossils. We show that depending on the taphonomic history, both calcium phosphate and calcite can participate in the diagenesis of the connecting ring wall. Under standard light microscopy, the phosphatised elements are indistinguishable from the calcified ones. Both are dark brown in colour, due to an excess of carbon. The structure of the phosphatised siphuncle does not closely replicate the structure of its organic elements. This casts doubts on conclusions of other authors who described a complex porous structure in ammonite siphuncles, which is completely dissimilar to the siphuncular structure of Recent Nautilus and suggests that this organ functioned differently in ammonites. SEM observations using a BSE detector on the calcified parts of the walls of connecting rings revealed a multilayered structure with perpendicular elements connecting particular layers, resembling the structure of a stacked nacreous layer.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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