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Elastic wave control in reticulated plates using Schwarz primitive cells.
Philos Trans A Math Phys Eng Sci
September 2024
Zurich University of Applied Sciences (ZHAW), Winterthur, Switzerland.
In this work, the Schwarz primitive unit cell is used as the building block of different types of metastructures for steering and focusing elastic vibrations. The emergence of a Bragg-type bandgap when constructing a two-dimensional plate from such unit cells is experimentally validated. It is demonstrated that increasing both mass and porosity of the Schwarz primitive leads to a decrease in the frequency of the out-of-plane propagating wave targeted in this study.
View Article and Find Full Text PDFDynamic Entwined Topology in Helical Covalent Polymers Dictated by Competing Supramolecular Interactions.
Angew Chem Int Ed Engl
May 2024
Department of Chemistry, University of Colorado Boulder, Boulder, CO-80309, USA.
Naturally occurring polymeric structures often consist of 1D polymer chains intricately folded and entwined through non-covalent bonds, adopting precise topologies crucial for their functionality. The exploration of crystalline 1D polymers through dynamic covalent chemistry (DCvC) and supramolecular interactions represents a novel approach for developing crystalline polymers. This study shows that sub-angstrom differences in the counter-ion size can lead to various helical covalent polymer (HCP) topologies, including a novel metal-coordination HCP (m-HCP) motif.
View Article and Find Full Text PDFReproductive Capacity and Scanning Electron Microscopy (SEM) Analyses of the Micromorphological Surfaces of Three Endemic Species from Bulgaria.
Plants (Basel)
June 2023
Department of Plant and Fungal Diversity and Resources, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Velen., Janka and Wierzb. ex Heuff.
View Article and Find Full Text PDFCytoarchitectonical dynamic of Sertoli cells in Melanorivulus punctatus (Cyprinodontiformes: Rivulidae).
Micron
February 2013
Instituto de Biociências, Universidade Federal de Mato Grosso, Av. Fernando Corrêa da Costa, n° 2367, Bairro Boa Esperança, Cuiabá 78060-900, MT, Brazil.
The Sertoli cell contributes to spermatogenesis acting in the differentiation of germ cells and being the only somatic cells present in the germinal compartment. So that spermatogenesis is primarily dependent of Sertoli-Sertoli and Sertoli-germ cell interactions once Sertoli cells provide critical factors necessary for a successful differentiation of germ cells to sperm. In teleost fish the cytoplasmic extensions of Sertoli cells support the cysts that remain closed until spermiogenesis.
View Article and Find Full Text PDFUltrastructure and molecular phylogeny of the cryptomonad Goniomonas avonlea sp. nov.
Protist
March 2013
Canadian Institute for Advanced Research, Integrated Microbial Biodiversity Program, Department of Biochemistry and Molecular Biology, Dalhousie University, Sir Charles Tupper Medical Building, 5850 College Street, Halifax, Nova Scotia, B3H 4R2, Canada.
We describe a new species of cryptomonad, Goniomonas avonlea sp. nov., using molecular phylogeny and comprehensive microscopic investigation.
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