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Phosphatized organic nanostructures in the Cambrian linguloid brachiopod Ungula inornata (Mickwitz)

Lang, Liisa ; Puura, Ivar

Estonian journal of earth sciences, 2013-09, Vol.62 (3), p.121-130 [Periódico revisado por pares]

Tallinn: Estonian Academy Publishers

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  • Título:
    Phosphatized organic nanostructures in the Cambrian linguloid brachiopod Ungula inornata (Mickwitz)
  • Autor: Lang, Liisa ; Puura, Ivar
  • Assuntos: Brachiopoda ; Cambrian ; Estonia ; Identification and classification ; Natural history ; scanning electron microscopy ; shell structure ; Ungula inornata ; Zoology
  • É parte de: Estonian journal of earth sciences, 2013-09, Vol.62 (3), p.121-130
  • Descrição: Scanning electron microscopy of untreated and uncoated fracture sections of a secondary shell of a Cambrian (Furongian) linguloid brachiopod Ungula inornata (Mickwitz) in concurrent backscattered electron and secondary electron imaging regimes revealed phosphatized organic fibril-like nanostructures, less than 200 nm in diameter. By analogy with published data on a living lingulate genus Discinisca, the nanofibrils are interpreted as parts of the organic biopolymer matrix, which are composed of axial protein strands of bacula connected by chitin and participate in the formation of baculate sets. The nanofibrils are relevant structural units in the hierarchical structure of lingulate brachiopods with baculate shell structure. It is concluded that these structures are preserved by instant post-mortem precipitation of apatite. The shell structure of U. inornata is most similar to the other species of the genus Ungula Pander and the species of the genus Obolus Eichwald. Key words: Brachiopoda, Ungula inornata, shell structure, scanning electron microscopy, Cambrian, Estonia. Skaneeriva elektronmikroskoobi (SEM) abil uuriti linguloidide hulka kuuluva fosfaatse kojaga Kambriumi kasijalgse Ungula inornata (Mickwitz) koja ristloike tootlemata ja katmata murdepindu, rakendades reziimi, mis voimaldas samaaegselt kuvada ning salvestada tagasihajunud elektronide (BSE) ja sekundaarsete elektronide (SE) abil saadud kujutisi. Kojas avastati fosfatiseerunud orgaanilised kiulised struktuurid labimooduga alla 200 nm, mis on omavahel Uhendatud peenemate kiudude vorgustikuga. Vordlus tanapaevaste kasijalgsete perekonnaga Discinisca varem avaldatud toode pohjal lubab jareldada, et kiire fosfatiseerumine on talletanud 500 miljoni aasta vanuse kasijalgse orgaanilise struktuuri peenimadki detailid, sealhulgas koja ehituses oluliste apatiidist varraste teljeks olevad valgukiud ja nendega Uhendatud kitiinist vorgustiku. Ungula inornata koja struktuur on koige sarnasem sama perekonna ja perekonna Obolus liikide kodade struktuuridega. Vaadeldud nanostruktuurid on vorreldavad paljude seni uuritud fossiilsete ja praegu elavate lingulaatide, fosfaatse kojaga kasijalgsete struktuuridega.
  • Editor: Tallinn: Estonian Academy Publishers
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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