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Actinocyclus

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Margherita Gavagnin – One of the best experts on this subject based on the ideXlab platform.

Yoshihiro Tanimura – One of the best experts on this subject based on the ideXlab platform.

  • The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution.
    PloS one, 2018
    Co-Authors: Tatsuya Hayashi, Megumi Saito-kato, William N. Krebs, Yoshihiro Tanimura
    Abstract:

    Fossil evidence indicates that modern assemblages of temperate nonmarine planktonic diatoms began near the middle/late Miocene boundary when the genus Actinocyclus, an important constituent of lacustrine planktonic diatom assemblages during the early to middle Miocene, was replaced by genera of the family Stephanodiscaceae. This floral turnover has been confirmed in many regions of the world, except eastern Asia where taxonomic data about early and middle Miocene planktonic diatom assemblages have until recently been scarce. Our analysis of Lower and Middle Miocene lacustrine diatomaceous rocks in Japan confirms that species of nonmarine Actinocyclus were important constituents of lake phytoplankton there as well. The appearance of nonmarine Actinocyclus species near the beginning of the Miocene may have resulted from the introduction of euryhaline species into lacustrine environments during a highstand of sea level at that time. Similarly, it is possible that species of Stephanodiscaceae evolved from marine thalassiosiroid ancestors that invaded high latitude lacustrine environments during multiple Paleogene highstands, resulting in a polyphyletic origin of the family. The turnover from nonmarine Actinocyclus to Stephanodiscaceae genera near the middle/late Miocene boundary may be linked to a contemporaneous increase in silica concentrations in lakes caused by active volcanism, increased weathering of silicate rocks due to orogeny, and the expansion of C4 grasslands. This turnover may also have been influenced by enhanced seasonal environmental changes in the euphotic zone caused by the initiation of monsoon conditions and a worldwide increase in meridional temperature gradients during the late Miocene. Morphological characteristics of Stephanodiscaceae genera, such as strutted processes and small size, suggest their species were better adapted to seasonal environmental changes than nonmarine species of Actinocyclus because of their superiority in floating and drifting capabilities and possibly metabolism, intrinsic growth rate, and reproductivity. As climates deteriorated during the late Miocene, Stephanodiscaceae species may have spread from high latitudes to temperate lakes where they diversified, ultimately displacing Actinocyclus.

  • Localities with nonmarine Miocene species of Actinocyclus in Japan.
    , 2018
    Co-Authors: Tatsuya Hayashi, Megumi Saito-kato, William N. Krebs, Yoshihiro Tanimura
    Abstract:

    Localities with nonmarine Miocene species of Actinocyclus in Japan.

  • Comparison of valve diameter among nonmarine.
    , 2018
    Co-Authors: Tatsuya Hayashi, Megumi Saito-kato, William N. Krebs, Yoshihiro Tanimura
    Abstract:

    Actinocyclus, Cyclostephanos, Stephanodiscus, Mesodictyon and cyclotelloid species. Data are collected from [13, 37, 43, 94, 97].

Marianna Carbone – One of the best experts on this subject based on the ideXlab platform.

  • Marine Terpenoid Diacylguanidines: Structure, Synthesis, and Biological Evaluation of Naturally Occurring Actinofide and Synthetic Analogues
    Journal of natural products, 2017
    Co-Authors: Marianna Carbone, M. Letizia Ciavatta, Véronique Mathieu, Aude Ingels, Robert Kiss, Paola Pascale, Ernesto Mollo, Nicon Ungur, Yue-wei Guo, Margherita Gavagnin
    Abstract:

    A new diacylguanidine, actinofide (1), has been isolated from the marine mollusk Actinocyclus papillatus. The structure, exhibiting a guanidine moiety acylated by two terpenoid acid units, has been established by spectroscopic methods and secured by synthesis. Following this, a series of structural analogues have been synthesized using the same procedure. All of the compounds have been evaluated in vitro for the growth inhibitory activity against a variety of cancer cell lines.

  • Marine Terpenoid Diacylguanidines: Structure, Synthesis, and Biological Evaluation of Naturally Occurring Actinofide and Synthetic Analogues
    , 2017
    Co-Authors: Marianna Carbone, Aude Ingels, Robert Kiss, Paola Pascale, Ernesto Mollo, Nicon Ungur, Yue-wei Guo, Letizia M. Ciavatta, Véronique Mathieu, Margherita Gavagnin
    Abstract:

    A new diacylguanidine, actinofide (1), has been isolated from the marine mollusk Actinocyclus papillatus. The structure, exhibiting a guanidine moiety acylated by two terpenoid acid units, has been established by spectroscopic methods and secured by synthesis. Following this, a series of structural analogues have been synthesized using the same procedure. All of the compounds have been evaluated in vitro for the growth inhibitory activity against a variety of cancer cell lines

  • structure and synthesis of a unique isonitrile lipid isolated from the marine mollusk Actinocyclus papillatus
    Organic Letters, 2011
    Co-Authors: Emiliano Manzo, Marianna Carbone, M. Letizia Ciavatta, Ernesto Mollo, Yue-wei Guo, Carlo Irace, Antonio Di Pascale, Guido Cimino, Margherita Gavagnin
    Abstract:

    The first chemical study of an Actinocyclidae nudibranch, Actinocyclus papillatus, resulted in the isolation of (-)-actisonitrile (1), a lipid based on a 1,3-propanediol ether skeleton. The structure was established by spectroscopic methods, whereas the absolute configuration of the chiral center was determined by comparing the optical properties of natural actisonitrile with those of (+)- and (-)-synthetic enantiomers, opportunely prepared. Both (-)- and (+)-actisonitrile were tested in preliminary in vitro cytotoxicity bioassays on tumor and nontumor mammalian cells.

Michael Schirmer – One of the best experts on this subject based on the ideXlab platform.

Ernesto Mollo – One of the best experts on this subject based on the ideXlab platform.

  • Marine Terpenoid Diacylguanidines: Structure, Synthesis, and Biological Evaluation of Naturally Occurring Actinofide and Synthetic Analogues
    Journal of natural products, 2017
    Co-Authors: Marianna Carbone, M. Letizia Ciavatta, Véronique Mathieu, Aude Ingels, Robert Kiss, Paola Pascale, Ernesto Mollo, Nicon Ungur, Yue-wei Guo, Margherita Gavagnin
    Abstract:

    A new diacylguanidine, actinofide (1), has been isolated from the marine mollusk Actinocyclus papillatus. The structure, exhibiting a guanidine moiety acylated by two terpenoid acid units, has been established by spectroscopic methods and secured by synthesis. Following this, a series of structural analogues have been synthesized using the same procedure. All of the compounds have been evaluated in vitro for the growth inhibitory activity against a variety of cancer cell lines.

  • Marine Terpenoid Diacylguanidines: Structure, Synthesis, and Biological Evaluation of Naturally Occurring Actinofide and Synthetic Analogues
    , 2017
    Co-Authors: Marianna Carbone, Aude Ingels, Robert Kiss, Paola Pascale, Ernesto Mollo, Nicon Ungur, Yue-wei Guo, Letizia M. Ciavatta, Véronique Mathieu, Margherita Gavagnin
    Abstract:

    A new diacylguanidine, actinofide (1), has been isolated from the marine mollusk Actinocyclus papillatus. The structure, exhibiting a guanidine moiety acylated by two terpenoid acid units, has been established by spectroscopic methods and secured by synthesis. Following this, a series of structural analogues have been synthesized using the same procedure. All of the compounds have been evaluated in vitro for the growth inhibitory activity against a variety of cancer cell lines

  • structure and synthesis of a unique isonitrile lipid isolated from the marine mollusk Actinocyclus papillatus
    Organic Letters, 2011
    Co-Authors: Emiliano Manzo, Marianna Carbone, M. Letizia Ciavatta, Ernesto Mollo, Yue-wei Guo, Carlo Irace, Antonio Di Pascale, Guido Cimino, Margherita Gavagnin
    Abstract:

    The first chemical study of an Actinocyclidae nudibranch, Actinocyclus papillatus, resulted in the isolation of (-)-actisonitrile (1), a lipid based on a 1,3-propanediol ether skeleton. The structure was established by spectroscopic methods, whereas the absolute configuration of the chiral center was determined by comparing the optical properties of natural actisonitrile with those of (+)- and (-)-synthetic enantiomers, opportunely prepared. Both (-)- and (+)-actisonitrile were tested in preliminary in vitro cytotoxicity bioassays on tumor and nontumor mammalian cells.