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Your search keyword '"Victor V. Sivkov"' showing total 2 results
Start Over Author "Victor V. Sivkov" Topic chemistry.chemical_compound
2 results on '"Victor V. Sivkov"'

1. Discovery of 505-million-year old chitin in the basal demosponge Vauxia gracilenta

Author

Denis V. Vyalikh, Victor V. Sivkov, J. Keith Rigby, Thorsten Geisler, Paul Simon, Mikhail V. Tsurkan, Hermann Ehrlich, Andrzej Pisera, Denis V. Kurek, S. Hunoldt, Joseph P. Botting, Zdeněk Petrášek, Martin Kammer, Carsten Werner, Petra Schwille, Vasilii V. Bazhenov, Dawid Stawski, A. Steinhof, Serguei L. Molodtsov, and René Born

Subjects
Multidisciplinary, Fossil Record, biology, Fossils, Zoology, Chitin, Burgess Shale, Biological evolution, biology.organism_classification, Biological Evolution, Fossilization, Article, Porifera, Precambrian, chemistry.chemical_compound, Demosponge, Vauxia, chemistry, Polysaccharides, ddc:000, Animals
Abstract

Sponges are probably the earliest branching animals, and their fossil record dates back to the Precambrian. Identifying their skeletal structure and composition is thus a crucial step in improving our understanding of the early evolution of metazoans. Here, we present the discovery of 505–million-year-old chitin, found in exceptionally well preserved Vauxia gracilenta sponges from the Middle Cambrian Burgess Shale. Our new findings indicate that, given the right fossilization conditions, chitin is stable for much longer than previously suspected. The preservation of chitin in these fossils opens new avenues for research into other ancient fossil groups.

Published
2013
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2. Identification and first insights into the structure and biosynthesis of chitin from the freshwater sponge Spongilla lacustris

Author

Eike Brunner, Vasilii V. Bazhenov, Olga V. Petrova, Konstantin R. Tabachnick, Victor V. Sivkov, Micha Ilan, Silvia Paasch, Denis V. Vyalikh, Gert Wörheide, Roberta Galli, Allison L. Stelling, S. Hunoldt, René Born, Martin Kammer, Oksana V. Kaluzhnaya, Alexander V. Ereskovsky, Sergei I. Belikov, Mikhail V. Tsurkan, Hermann Ehrlich, Institute of Experimental Physics [Freiberg], Technishe Universität Bergakademie Freiberg (TU Bergakademie Freiberg), Technische Universität Dresden = Dresden University of Technology (TU Dresden), Limnological Institute, Russian Academy of Sciences [Moscow] (RAS), Leibniz Institute of Polymer Research Dresden, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Tel Aviv University [Tel Aviv], P.P. Shirshov Institute of Oceanology (SIO), Institute of Materials Science [Dresden], Universitätsklinikum Carl Gustav Carus Dresden der TU Dresden, Komi Research Center, Ural Branch of Russian Academy of Sciences (UB RAS), Ludwig-Maximilians-Universität München (LMU), and Tel Aviv University (TAU)

Subjects
Spectrometry, Mass, Electrospray Ionization, [SDV]Life Sciences [q-bio], Amino Acid Motifs, Molecular Sequence Data, Chitin, 02 engineering and technology, Calcofluor-white, engineering.material, Acetylglucosamine, 03 medical and health sciences, chemistry.chemical_compound, Biosynthesis, Structural Biology, Spongilla lacustris, Botany, Spectroscopy, Fourier Transform Infrared, Animals, Amino Acid Sequence, Cloning, Molecular, Skeleton, 030304 developmental biology, 0303 health sciences, biology, Chitin synthase, Structural component, 021001 nanoscience & nanotechnology, biology.organism_classification, Porifera, Sponge, X-Ray Absorption Spectroscopy, chemistry, Sponges, engineering, biology.protein, Biopolymer, 0210 nano-technology, Bioanalytics
Abstract

International audience; This work demonstrates that chitin is an important structural component within the skeletal fibers of the freshwater sponge Spongilla lacustris. Using a variety of analytical techniques (13 C solid state NMR, FT-IR, Raman, NEXAFS, ESI-MS, Morgan-Elson assay and Calcofluor White Staining); we show that this sponge chitin is much closer to a-chitin, known to be present in other animals, than to b-chitin. Genetic analysis confirmed the presence of chitin synthases, which are described for the first time in a sponge. The presence of chitin in both marine (demosponges and hexactinellids) and freshwater sponges indicates that this important structural biopolymer was already present in their common ancestor.

Published
2013
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