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Sökning: WFRF:(Davidovich P. B.)

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1.
  • Gastineau, R., et al. (författare)
  • Haslea ostrearia-like Diatoms: Biodiversity out of the Blue
  • 2014
  • Ingår i: Advances in Botanical Research. - London : Academic Press Ltd-Elsevier Science Ltd. - 0065-2296. ; 71, s. 441-465
  • Tidskriftsartikel (refereegranskat)abstract
    • Diatoms are usually referred to as golden-brown microalgae, due to the colour of their plastids and to their pigment composition, mainly carotenoids (fucoxanthin, diadinoxanthin, diatoxanthin), which mask chlorophylls a and c. The species Haslea ostrearia Gaillon/Bory (Simonsen) appears unique because of its extraplastidial bluish colour, a consequence of the presence of a water-soluble blue pigment at cell apices, marennine. When released in seawater, marenbine can be fixed on gills of oysters and other bivalves, which turn green. This greening phenomenon is economically exploited in Southwestern France, as it gives an added value to oysters. For decades, this singularity ascribed a worldwide distribution to H. ostrearia, first as Vibrio ostrearius, then Navicula ostrearia, last as H. ostrearia, when the genus Haslea was proposed by R. Simonsen (1974). Indeed, this 'birthmark' (presence of blue apices) made H. ostrearia easily recognisable without further scrutiny and identification of the microalga as well as its presence easily deduced from the greening of bivalves. Consequently, the widely admitted cosmopolitan character of H. ostrearia has only been questioned recently, following the discovery in 2008, of a new species of blue diatom in the Black Sea, Haslea karadagensis. The biodiversity of blue diatoms suddenly increased with the finding of other blue species in the Mediterranean Sea, the Canary Islands, etc., the taxonomic characterization of which is in progress. This review thus focuses on the unsuspected biodiversity of blue diatoms within the genus Haslea. Methods for species determination (morphometrics, chemotaxonomy, genomics), as well as a new species, are presented and discussed.
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2.
  • Davidovich, P. B., et al. (författare)
  • Synthesis and structure of dinitrosyl iron complexes with secondary thiolate bridging ligands [Fe-2(mμ-SCHR2)(2)(NO)(4)], R = Me, Ph
  • 2015
  • Ingår i: Polyhedron. - : Elsevier. - 0277-5387 .- 1873-3719. ; 90, s. 197-201
  • Tidskriftsartikel (refereegranskat)abstract
    • New dinitrosyl iron complexes of binuclear structure [Fe-2(mu-SCHMe2)(2)(NO)(4)] and [Fe-2(mu-SCHPh2)(2)(NO)(4)] were first synthesized employing new method from Fe(CO)(5), corresponding thiol, and EtONO. Complexes structures were determined by XRD technique. DFT calculations were performed to probe the cis-conformer structures in gas and solution phases. NO donor ability of the complex with isopropyl thiolate ligand was studied.
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3.
  • Davidovich, P. B., et al. (författare)
  • Synthesis, structure, biochemical, and docking studies of a new dinitrosyl iron complex [Fe-2(mu-SC4H3SCH2)(2)(NO)(4)]
  • 2015
  • Ingår i: Journal of Molecular Structure. - : Elsevier BV. - 0022-2860 .- 1872-8014. ; 1092, s. 137-142
  • Tidskriftsartikel (refereegranskat)abstract
    • A new dinitrosyl iron complex of binuclear structure [Fe-2(mu-S-2-methylthiophene)(2)(NO)(4)] was first synthesized and structurally characterized by XRD and theoretical methods. Using caspase-3 as an example it was shown that [Fe-2(mu-S-2-methylthiophene)(2)(NO)(4)] and its analog [Fe-2(mu-S-2-methylfurane)(2)(NO)(4)] can inhibit the action of active site cysteine proteins; the difference in inhibitory activity was explained by molecular docking studies. Biochemical and in silico studies give grounds that the biological activity of dinitrosyl iron complexes is a mu-SR bridging ligand structure function. Thus the rational design strategy of [Fe-2(mu-SR)(2)(NO)(4)] complexes can be applied to make NO prodrugs with high affinity to therapeutically significant targets involved in cancer and inflammation.
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4.
  • Gastineau, R, et al. (författare)
  • Inheritance of Mitochondrial DNA in the Pennate Diatom Haslea ostrearia (Naviculaceae) during Auxosporulation Suggests a Uniparental Transmission
  • 2013
  • Ingår i: Protist. - 1434-4610 .- 1618-0941. ; 164:3, s. 340-351
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the first study examining mtDNA transmission in diatoms, using sexual progeny of the pennate species Has lea ostrearia (Naviculaceae). A fragment of the cytochrome oxidase subunit I gene (cox1) with 7 nucleic substitutions between parental clones was used as a parental tracer in 16 F1 clones obtained from two pairs of mating crosses. Each cross involved a parental clone isolated from France (Bay of Bourgneuf) and Sweden (Kattegat Bay). We determined that all progeny possessed only one cox1 parental haplotype. These results suggest that the mitochondrial DNA transmission in H. ostrearia is uniparental. Implications and new topics of investigation are discussed. (C) 2013 Elsevier GmbH. All rights reserved.
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  • Resultat 1-4 av 4

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