نتایج جستجو برای: echinoderms

تعداد نتایج: 914  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1998
J Castresana G Feldmaier-Fuchs S Pääbo

In the mitochondrial genome of the hemichordate Balanoglossus carnosus, the codon AAA, which is assigned to lysine in most metazoans but to asparagine in echinoderms, is absent. Furthermore, the lysine tRNA gene carries an anticodon substitution that renders its gene product unable to decode AAA codons, whereas the asparagine tRNA gene has not changed to encode a tRNA with the ability to recogn...

Journal: :Cell calcium 2013
Isabela Ramos Gary M Wessel

Calcium signaling in cells directs diverse physiological processes. The calcium waves triggered by fertilization is a highly conserved calcium signaling event essential for egg activation, and has been documented in every egg tested. This activity is one of the few highly conserved events of egg activation through the course of evolution. Echinoderm eggs, as well as many other cell types, have ...

Journal: :Comparative biochemistry and physiology. Part C, Pharmacology, toxicology & endocrinology 1998
P J den Besten

The results of a limited number of studies on echinoderms provide evidence for the presence of a cytochrome P450 monooxygenase system in representatives of three classes of the phylum Echinodermata: the asteroids (sea stars), holothuroids (sea cucumbers) and echinoids (sea urchins). The monooxygenase system has been demonstrated to be involved in the metabolism of xenobiotic compounds, but is a...

Journal: :Revista de Biología Tropical 2021

Journal: :Annals and Magazine of Natural History 1854

Journal: :Annals and Magazine of Natural History 1854

Journal: :Annals and Magazine of Natural History 1885

Journal: :Publications of the Seto Marine Biological Laboratory 1952

Journal: :Bulletin of the British Museum (Natural History). 1974

Journal: :Journal of Paleontology 2023

Abstract Evidence from the earliest-known crinoids (Tremadocian, Early Ordovician), called protocrinoids, is used to hypothesize initial steps by which elements of calyx evolved. Protocrinoid calyces are composed extraxial primary and surrounding secondary plates (both have epispires along their sutures) that unlike those more crownward fossil extant in equivalent calycinal plating strongly org...

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