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  1. Article ; Online: The first arctic strain of Rhizochromulina: Morphology, ultrastructure, and position in the evolutionary tree of the order Rhizochromulinales (Heterokontophyta, Dictyochophyceae).

    Safonov, Pavel / Berdieva, Mariia / Nassonova, Elena / Skarlato, Sergei / Pozdnyakov, Ilya

    European journal of protistology

    2023  Volume 92, Page(s) 126050

    Abstract: Rhizochromulina marina is a unicellular amoeboid alga capable of forming flagellate cells; it is a single validly named species in the genus. Besides, there are numerous environmental sequences and undescribed strains designated as Rhizochromulina sp. or ...

    Abstract Rhizochromulina marina is a unicellular amoeboid alga capable of forming flagellate cells; it is a single validly named species in the genus. Besides, there are numerous environmental sequences and undescribed strains designated as Rhizochromulina sp. or R. marina. The biogeography of the genus is understudied: rhizochromulines from the Indian, Southern, and Arctic Oceans are unknown. Here, we present the description of Rhizochromulina sp. B44, which was for the first time isolated from an arctic habitat. Biofilms of this microalga grow at the bottom of a culture vessel, where neighbouring amoeboid cells form associations through a common network of pseudopodia, i.e. meroplasmodia. Pseudopodia branch, anastomose mainly during meroplasmodia formation, and are supported by microtubules that arise from the perinuclear zone. Actin filaments are localized in the cytoplasm and can be revealed only near the bases of pseudopodia. We succeeded in inducing the transformation of amoeboid cells into flagellates using a prolonged agitation of cultures. Morphological and molecular analyses revealed that the studied strain is most closely related to the type strain of R. marina. At the same time, 18S rDNA sequences of early branching-off rhizochromulinids differ significantly from Rhizochromulina sp. B44, suggesting a high divergence at the genus level.
    MeSH term(s) Phylogeny ; Biological Evolution ; Arctic Regions ; DNA, Ribosomal/genetics ; Amoeba/genetics ; Sequence Analysis, DNA
    Chemical Substances DNA, Ribosomal
    Language English
    Publishing date 2023-12-17
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2047872-0
    ISSN 1618-0429 ; 0932-4739
    ISSN (online) 1618-0429
    ISSN 0932-4739
    DOI 10.1016/j.ejop.2023.126050
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Diversity of voltage-gated potassium channels and cyclic nucleotide-binding domain-containing channels in eukaryotes.

    Pozdnyakov, Ilya / Safonov, Pavel / Skarlato, Sergei

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 17758

    Abstract: Voltage-gated potassium channels ( ... ...

    Abstract Voltage-gated potassium channels (K
    MeSH term(s) Animals ; Cyclic Nucleotide-Gated Cation Channels/metabolism ; Databases, Protein ; Ether-A-Go-Go Potassium Channels/metabolism ; Eukaryota/metabolism ; Evolution, Molecular ; Humans ; Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels/metabolism ; Phylogeny ; Potassium Channels, Voltage-Gated/metabolism ; Protein Conformation
    Chemical Substances Cyclic Nucleotide-Gated Cation Channels ; Ether-A-Go-Go Potassium Channels ; Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels ; Potassium Channels, Voltage-Gated
    Language English
    Publishing date 2020-10-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-74971-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: [Fe(Ox)

    Pozdnyakov, Ivan / Sherin, Peter / Bazhin, Nikolai / Plyusnin, Victor

    Chemosphere

    2018  Volume 195, Page(s) 839–846

    Abstract: In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox) ...

    Abstract In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox)
    MeSH term(s) 2,4-Dichlorophenoxyacetic Acid/analogs & derivatives ; 2,4-Dichlorophenoxyacetic Acid/chemistry ; Ferric Compounds/chemistry ; Hydrogen-Ion Concentration ; Oxalates/chemistry ; Photolysis ; Water Pollutants, Chemical/chemistry ; Water Purification/instrumentation ; Water Purification/methods
    Chemical Substances Ferric Compounds ; Oxalates ; Water Pollutants, Chemical ; 2,4-Dichlorophenoxyacetic Acid (2577AQ9262) ; 4-(2,4-dichlorophenoxy)butyric acid (SL314DW868)
    Language English
    Publishing date 2018-03
    Publishing country England
    Document type Evaluation Studies ; Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2017.12.096
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 2540: Show issues Location:
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  4. Article ; Online: Diversity and evolution of four-domain voltage-gated cation channels of eukaryotes and their ancestral functional determinants.

    Pozdnyakov, Ilya / Matantseva, Olga / Skarlato, Sergei

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 3539

    Abstract: Four-domain voltage-gated cation channels (FVCCs) represent a large family of pseudo-tetrameric ion channels which includes voltage-gated calcium ( ... ...

    Abstract Four-domain voltage-gated cation channels (FVCCs) represent a large family of pseudo-tetrameric ion channels which includes voltage-gated calcium (Ca
    MeSH term(s) Amino Acid Sequence/genetics ; Animals ; Calcium Channels/genetics ; Cations ; Eukaryota/genetics ; Eukaryota/metabolism ; Evolution, Molecular ; Phylogeny ; Protein Domains/genetics ; Voltage-Gated Sodium Channels/genetics
    Chemical Substances Calcium Channels ; Cations ; Voltage-Gated Sodium Channels
    Language English
    Publishing date 2018-02-23
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-21897-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: [Fe(Ox)3]3- complex as a photodegradation agent at neutral pH: Advances and limitations

    Pozdnyakov, Ivan / Peter Sherin / Nikolai Bazhin / Victor Plyusnin

    Chemosphere. 2018 Mar., v. 195

    2018  

    Abstract: In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox)3]³⁻) to the photodegradation of a model persistent organic contaminant - 2,4-dichlorophenoxybutanoic acid (2,4-DB) in neutral aqueous solutions ... ...

    Abstract In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox)3]³⁻) to the photodegradation of a model persistent organic contaminant - 2,4-dichlorophenoxybutanoic acid (2,4-DB) in neutral aqueous solutions were systematically investigated for the first time. It has been shown that the efficiency of [Fe(Ox)3]³⁻ system greatly depends on the initial concentrations of oxalate ion due to the fast consumption of the ligand during photodegradation process leading to the formation of photochemically less active Fe(III) species. Efficiency of Fe(Ox)3³⁻ system normalized to UVA absorption at the excitation wavelength is practically independent on [Fe(III)]. Thus, it is highly probable that concentrations of Fe(III) as low as < 10⁻⁵ M could be applied in water treatment procedures using reactors with very long optical path. The system also keeps high efficiency at low concentration of pollutant (<10⁻⁵ M) though this results in higher relative consumption rate of Fe(III) and oxalate ions.
    Keywords 2,4-DB ; absorption ; aqueous solutions ; ions ; iron ; ligands ; models ; oxalates ; pH ; photolysis ; pollutants ; water treatment ; wavelengths
    Language English
    Dates of publication 2018-03
    Size p. 839-846.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2017.12.096
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: [ANALYSIS OF THE DINOFLAGELLATE PROROCENTRUM MINIMUM TRANSCRIPTOME: IDENTIFYING THE MEMBERS OF THE VOLTAGE-GATED CATION CHANNELS SUPERFAMILY].

    Pozdnyakov, I A / Skarlato, S O

    Tsitologiia

    2015  Volume 57, Issue 7, Page(s) 533–543

    Abstract: Dinoflagellates are an ecologically important group of aquatic single-cell eukaryotes. At the present time relatively little is known about physiological features that determine the role of these protists in natural ecosystems. Lack of knowledge on the ... ...

    Abstract Dinoflagellates are an ecologically important group of aquatic single-cell eukaryotes. At the present time relatively little is known about physiological features that determine the role of these protists in natural ecosystems. Lack of knowledge on the diversity, structure, and functioning of dinoflagellate ion channels significantly hampers the interpretation of physiological reactions and adaptations in these microorganisms. We performed the analysis of the translated transcriptome databases that belong to two strains of the dinoflagellate Prorocentrum minimum in order to identify the members of the voltage-gated cation channels superfamily. We found out that transcriptomes of these potentially toxic microorganisms contained the homologues of: 1) inwardly rectifying potassium channels (K(ir)), 2) voltage-gated potassium channels (K(v)), 3) calcium-activated potassium channels (K(Ca)), 4) cyclic nucleotide-gated channels (EAG and HCN/CNG), 5) TRPV and TRPP channels, 6) two-pore calcium channels TPC, 7) voltage-gated sodium (Na(v)) and calcium (Ca(v)) channels, 8) voltage-gated proton channels (H(v)).
    MeSH term(s) Dinoflagellida/genetics ; Dinoflagellida/metabolism ; Gene Expression Regulation/physiology ; Ion Channel Gating/physiology ; Ion Channels/biosynthesis ; Ion Channels/genetics ; Protozoan Proteins/biosynthesis ; Protozoan Proteins/genetics ; Transcriptome/physiology
    Chemical Substances Ion Channels ; Protozoan Proteins
    Language Russian
    Publishing date 2015
    Publishing country Russia (Federation)
    Document type English Abstract ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280565-0
    ISSN 0041-3771
    ISSN 0041-3771
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  7. Article ; Online: Sub-inhibitory membrane damage undermines Staphylococcus aureus virulence.

    Hershkovits, Ayelet Sarah / Pozdnyakov, Igor / Meir, Ohad / Mor, Amram

    Biochimica et biophysica acta. Biomembranes

    2019  Volume 1861, Issue 6, Page(s) 1172–1179

    Abstract: We investigated antibacterial properties of a recently described membrane-active lipopeptide, ... ...

    Abstract We investigated antibacterial properties of a recently described membrane-active lipopeptide, C
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Cell Membrane/drug effects ; Hydrophobic and Hydrophilic Interactions ; Membrane Potentials ; Microbial Sensitivity Tests ; Staphylococcus aureus/drug effects ; Staphylococcus aureus/pathogenicity ; Virulence
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2019-04-08
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 60-7
    ISSN 1879-2642 ; 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2642 ; 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbamem.2019.04.002
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  8. Article ; Online: Stressor-induced ecdysis and thecate cyst formation in the armoured dinoflagellates Prorocentrum cordatum.

    Matantseva, Olga / Berdieva, Mariia / Kalinina, Vera / Pozdnyakov, Ilya / Pechkovskaya, Sofia / Skarlato, Sergei

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 18322

    Abstract: Ecdysis, the process of extensive cell covering rearrangement, represents a remarkable physiological trait of dinoflagellates. It is involved in the regulation of the population and bloom dynamics of these microorganisms, since it is required for the ... ...

    Abstract Ecdysis, the process of extensive cell covering rearrangement, represents a remarkable physiological trait of dinoflagellates. It is involved in the regulation of the population and bloom dynamics of these microorganisms, since it is required for the formation of their thin-walled cysts. This study presents laboratory data on ecdysis in Prorocentrum cordatum, a harmful dinoflagellate species of high environmental significance. We studied external stressors triggering this process and changes in the cell ultrastructure accompanying it. Our experiments showed that mass ecdysis and formation of cysts in P. cordatum could be induced by centrifugation, temperature decrease, changes in salinity, and treatment by 2,6-dichlorobenzonitrile, whereas temperature increase, changes in pH and treatment by tetracycline did not have this effect. Obtained cysts of P. cordatum did not contain the pellicular layer and were formed in the end of the first stage of this process, i.e. removal of the plasma membrane and the outer amphiesmal vesicle membrane, whereas its second stage, removal of theca, represented excystment. Based on our findings, we conclude that such cysts can be attributed to thecate cysts and suggest P. cordatum as a promising model organism for the investigation of cellular and molecular aspects of ecdysis in dinoflagellates.
    MeSH term(s) Dinoflagellida/physiology ; Dinoflagellida/ultrastructure ; Microscopy, Electron, Transmission ; Molting/physiology ; Stress, Physiological/physiology
    Language English
    Publishing date 2020-10-27
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-75194-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: MECHANICAL IMPACT ON THE CELL COVERING FINE STRUCTURE OF DINOFLAGELLATES PROROCENTRUM MINIMUM.

    Berdieva, M A / Skarlato,, S A / Matantseva, O V / Pozdnyakov, I A

    Tsitologiia

    2018  Volume 58, Issue 10, Page(s) 792–798

    MeSH term(s) Cell Membrane/metabolism ; Cell Membrane/ultrastructure ; Cell Wall/metabolism ; Cell Wall/ultrastructure ; Dinoflagellida/metabolism ; Dinoflagellida/ultrastructure ; Spheroplasts/metabolism ; Spheroplasts/ultrastructure ; Stress, Mechanical
    Language Russian
    Publishing date 2018-09-10
    Publishing country Russia (Federation)
    Document type Journal Article
    ZDB-ID 280565-0
    ISSN 0041-3771
    ISSN 0041-3771
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Erratum to "The Uncoupled Assimilation of Carbon and Nitrogen from Urea and Glycine by the Bloom-forming Dinoflagellate Prorocentrum minimum" [Protist 169 (November (5)) (2018) 603-614].

    Matantseva, Olga / Pozdnyakov, Ilya / Voss, Maren / Liskow, Iris / Skarlato, Sergei

    Protist

    2018  Volume 169, Issue 6, Page(s) 976–977

    Language English
    Publishing date 2018-12-11
    Publishing country Germany
    Document type Journal Article ; Published Erratum
    ZDB-ID 2036014-9
    ISSN 1618-0941 ; 1434-4610
    ISSN (online) 1618-0941
    ISSN 1434-4610
    DOI 10.1016/j.protis.2018.11.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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