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Rodilla BL, Arché-Núñez A, Ruiz-Gómez S, Domínguez-Bajo A, Fernández-González C, Guillén-Colomer C, González-Mayorga A, Rodríguez-Díez N, Camarero J, Miranda R, López-Dolado E, Ocón P, Serrano MC, Pérez L, González MT. Flexible metallic core-shell nanostructured electrodes for neural interfacing. Sci Rep 2024; 14:3729. [PMID: 38355737 PMCID: PMC10866994 DOI: 10.1038/s41598-024-53719-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 02/04/2024] [Indexed: 02/16/2024] Open
Abstract
Electrodes with nanostructured surface have emerged as promising low-impedance neural interfaces that can avoid the charge-injection restrictions typically associated to microelectrodes. In this work, we propose a novel approximation, based on a two-step template assisted electrodeposition technique, to obtain flexible nanostructured electrodes coated with core-shell Ni-Au vertical nanowires. These nanowires benefit from biocompatibility of the Au shell exposed to the environment and the mechanical properties of Ni that allow for nanowires longer and more homogeneous in length than their only-Au counterparts. The nanostructured electrodes show impedance values, measured by electrochemical impedance spectroscopy (EIS), at least 9 times lower than those of flat reference electrodes. This ratio is in good accordance with the increased effective surface area determined both from SEM images and cyclic voltammetry measurements, evidencing that only Au is exposed to the medium. The observed EIS profile evolution of Ni-Au electrodes over 7 days were very close to those of Au electrodes and differently from Ni ones. Finally, the morphology, viability and neuronal differentiation of rat embryonic cortical cells cultured on Ni-Au NW electrodes were found to be similar to those on control (glass) substrates and Au NW electrodes, accompanied by a lower glial cell differentiation. This positive in-vitro neural cell behavior encourages further investigation to explore the tissue responses that the implantation of these nanostructured electrodes might elicit in healthy (damaged) neural tissues in vivo, with special emphasis on eventual tissue encapsulation.
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Affiliation(s)
- Beatriz L Rodilla
- Fundación IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid, Plaza de las Ciencias S/N, 28040, Madrid, Spain
| | - Ana Arché-Núñez
- Fundación IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
| | - Sandra Ruiz-Gómez
- Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
| | - Ana Domínguez-Bajo
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
- Animal Molecular and Cellular Biology group (AMCB), Louvain Institute of Biomolecular Science and Technology (LIBST), Université catholique de Louvain, Place Croix du Sud 5, 1348 , Louvain la Neuve, Belgium
| | | | | | | | | | - Julio Camarero
- Fundación IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
- Department de Física de la Materia Condensada and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Rodolfo Miranda
- Fundación IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
- Department de Física de la Materia Condensada and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Elisa López-Dolado
- Hospital Nacional de Parapléjicos, SESCAM, Finca la Peraleda S/N, 45071, Toledo, Spain
- Design and development of Biomaterials for Neural Regeneration, HNP-SESCAM, Associated Unit With CSIC Through ICMM, Finca La Peraleda S/N, 45071, Toledo, Spain
| | - Pilar Ocón
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - María C Serrano
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
| | - Lucas Pérez
- Fundación IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid, Plaza de las Ciencias S/N, 28040, Madrid, Spain
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2
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Deng JR, González MT, Zhu H, Anderson HL, Leary E. Ballistic Conductance through Porphyrin Nanoribbons. J Am Chem Soc 2024; 146:3651-3659. [PMID: 38301131 PMCID: PMC10870699 DOI: 10.1021/jacs.3c07734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 11/22/2023] [Accepted: 11/22/2023] [Indexed: 02/03/2024]
Abstract
The search for long molecular wires that can transport charge with maximum efficiency over many nanometers has driven molecular electronics since its inception. Single-molecule conductance normally decays with length and is typically far below the theoretical limit of G0 (77.5 μS). Here, we measure the conductances of a family of edge-fused porphyrin ribbons (lengths 1-7 nm) that display remarkable behavior. The low-bias conductance is high across the whole series. Charging the molecules in situ results in a dramatic realignment of the frontier orbitals, increasing the conductance to 1 G0 (corresponding to a current of 20 μA). This behavior is most pronounced in the longer molecules due to their smaller HOMO-LUMO gaps. The conductance-voltage traces frequently exhibit peaks at zero bias, showing that a molecular energy level is in resonance with the Fermi level. This work lays the foundations for long, perfectly transmissive, molecular wires with technological potential.
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Affiliation(s)
- Jie-Ren Deng
- Department
of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, U.K.
| | - M. Teresa González
- Fundación
IMDEA Nanociencia, Calle
Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain
| | - He Zhu
- Department
of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, U.K.
| | - Harry L. Anderson
- Department
of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, U.K.
| | - Edmund Leary
- Fundación
IMDEA Nanociencia, Calle
Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain
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3
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Baeza JA, González MT, Sigwart JD, Greve C, Pirro S. Insights into the genome of the 'Loco' Concholepas concholepas (Gastropoda: Muricidae) from low-coverage short-read sequencing: genome size, ploidy, transposable elements, nuclear RNA gene operon, mitochondrial genome, and phylogenetic placement in the family Muricidae. BMC Genomics 2024; 25:77. [PMID: 38243187 PMCID: PMC10797722 DOI: 10.1186/s12864-023-09953-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 12/28/2023] [Indexed: 01/21/2024] Open
Abstract
BACKGROUND The Peruvian 'chanque' or Chilean 'loco' Concholepas concholepas is an economically, ecologically, and culturally important muricid gastropod heavily exploited by artisanal fisheries in the temperate southeastern Pacific Ocean. In this study, we have profited from a set of bioinformatics tools to recover important biological information of C. concholepas from low-coverage short-read NGS datasets. Specifically, we calculated the size of the nuclear genome, ploidy, and estimated transposable elements content using an in silico k-mer approach, we discovered, annotated, and quantified those transposable elements, we assembled and annotated the 45S rDNA RNA operon and mitochondrial genome, and we confirmed the phylogenetic position of C. concholepas within the muricid subfamily Rapaninae based on translated protein coding genes. RESULTS Using a k-mer approach, the haploid genome size estimated for the predicted diploid genome of C. concholepas varied between 1.83 Gbp (with kmer = 24) and 2.32 Gbp (with kmer = 36). Between half and two thirds of the nuclear genome of C. concholepas was composed of transposable elements. The most common transposable elements were classified as Long Interspersed Nuclear Elements and Short Interspersed Nuclear Elements, which were more abundant than DNA transposons, simple repeats, and Long Terminal Repeats. Less abundant repeat elements included Helitron mobile elements, 45S rRNA DNA, and Satellite DNA, among a few others.The 45S rRNA DNA operon of C. concholepas that encodes for the ssrRNA, 5.8S rRNA, and lsrRNA genes was assembled into a single contig 8,090 bp long. The assembled mitochondrial genome of C. concholepas is 15,449 bp long and encodes 13 protein coding genes, two ribosomal genes, and 22 transfer RNAs. CONCLUSION The information gained by this study will inform the assembly of a high quality nuclear genome for C. concholepas and will support bioprospecting and biomonitoring using environmental DNA to advance development of conservation and management plans in this overexploited marine snail.
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Affiliation(s)
- J Antonio Baeza
- Department of Biological Sciences, Clemson University, Clemson, SC, USA.
- Departamento de Biología Marina, Universidad Catolica del Norte, Coquimbo, Chile.
- Smithsonian Marine Station at Fort Pierce, Smithsonian Institution, Fort Pierce, FL, USA.
| | - M Teresa González
- Facultad de Ciencias del Mar y Recursos Biológicos, Instituto de Ciencias Naturales Alexander Von Humboldt, Universidad de Antofagasta, Angamos 601, Antofagasta, Chile
| | - Julia D Sigwart
- Marine Zoology Department, Senckenberg Research Institute and Museum, Frankfurt, Germany
- Institute of Ecology, Evolution & Diversity, Goethe University, Frankfurt, Germany
| | - Carola Greve
- LOEWE -Centre for Translational Biodiversity Genomics (LOEWE-TBG), Senckenberganlage 25, Frankfurt Am Main, Germany
- Senckenberg Forschungsinstitut und Naturmuseum, Frankfurt am Main, Germany
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4
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Svatek S, Sacchetti V, Rodríguez-Pérez L, Illescas BM, Rincón-García L, Rubio-Bollinger G, González MT, Bailey S, Lambert CJ, Martín N, Agraït N. Enhanced Thermoelectricity in Metal-[60]Fullerene-Graphene Molecular Junctions. Nano Lett 2023; 23:2726-2732. [PMID: 36970777 PMCID: PMC10103166 DOI: 10.1021/acs.nanolett.3c00014] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/14/2023] [Indexed: 06/18/2023]
Abstract
The thermoelectric properties of molecular junctions consisting of a metal Pt electrode contacting [60]fullerene derivatives covalently bound to a graphene electrode have been studied by using a conducting-probe atomic force microscope (c-AFM). The [60]fullerene derivatives are covalently linked to the graphene via two meta-connected phenyl rings, two para-connected phenyl rings, or a single phenyl ring. We find that the magnitude of the Seebeck coefficient is up to nine times larger than that of Au-C60-Pt molecular junctions. Moreover, the sign of the thermopower can be either positive or negative depending on the details of the binding geometry and on the local value of the Fermi energy. Our results demonstrate the potential of using graphene electrodes for controlling and enhancing the thermoelectric properties of molecular junctions and confirm the outstanding performance of [60]fullerene derivatives.
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Affiliation(s)
- Simon
A. Svatek
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday 9, Ciudad Universitaria
de Cantoblanco, 28049 Madrid, Spain
- Departamento
de Física de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente
7, 28049 Madrid, Spain
| | - Valentina Sacchetti
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday 9, Ciudad Universitaria
de Cantoblanco, 28049 Madrid, Spain
- Organic
Chemistry Department, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - Laura Rodríguez-Pérez
- Organic
Chemistry Department, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - Beatriz M. Illescas
- Organic
Chemistry Department, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - Laura Rincón-García
- Departamento
de Física de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente
7, 28049 Madrid, Spain
| | - Gabino Rubio-Bollinger
- Departamento
de Física de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente
7, 28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC) and Instituto Universitario de Ciencia
de Materiales “Nicolás Cabrera” (INC), Facultad
de Ciencias, Universidad Autónoma
de Madrid, C/Francisco
Tomás y Valiente 7, 28049 Madrid, Spain
| | - M. Teresa González
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday 9, Ciudad Universitaria
de Cantoblanco, 28049 Madrid, Spain
| | - Steven Bailey
- Department
of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Colin J. Lambert
- Department
of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Nazario Martín
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday 9, Ciudad Universitaria
de Cantoblanco, 28049 Madrid, Spain
- Organic
Chemistry Department, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - Nicolás Agraït
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday 9, Ciudad Universitaria
de Cantoblanco, 28049 Madrid, Spain
- Departamento
de Física de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente
7, 28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC) and Instituto Universitario de Ciencia
de Materiales “Nicolás Cabrera” (INC), Facultad
de Ciencias, Universidad Autónoma
de Madrid, C/Francisco
Tomás y Valiente 7, 28049 Madrid, Spain
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Ortuño AM, Reiné P, Álvarez de Cienfuegos L, Márquez IR, Dednam W, Lombardi EB, Palacios JJ, Leary E, Longhi G, Mujica V, Millán A, González MT, Zotti LA, Miguel D, Cuerva JM. Chiral Single-Molecule Potentiometers Based on Stapled ortho- Oligo(phenylene)ethynylenes. Angew Chem Int Ed Engl 2023; 62:e202218640. [PMID: 36806838 DOI: 10.1002/anie.202218640] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 02/22/2023]
Abstract
We report on the chemical design of chiral molecular junctions with stress-dependent conductance, whose helicity is maintained during the stretching of a single molecule junction due to the stapling of both ends of the inner helix. In the reported compounds, different conductive pathways are observed, with clearly different conductance values and plateau-length distributions, attributed to different conformations of the helical structures. The large chiro-optical responses and the potential use of these molecules as unimolecular spin filters have been theoretically proved using state-of-the-art Density Functional Theory (DFT) calculations, including a fully ab-initio estimation of the CISS-originating spin polarization which is done, for the first time, for a realistic molecular system.
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Affiliation(s)
- Ana M Ortuño
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Pablo Reiné
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Luis Álvarez de Cienfuegos
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Irene R Márquez
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Wynand Dednam
- Department of Physics, University of South Africa, Science Campus, Private Bag X6, Florida Park, 1710, South Africa
| | - Enrico B Lombardi
- Department of Physics, University of South Africa, Science Campus, Private Bag X6, Florida Park, 1710, South Africa
| | - Juan J Palacios
- Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera (INC) and IFIMAC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
| | - Edmund Leary
- Fundación IMDEA Nanociencia, 28049, Madrid, Spain
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale, Universitá di Brescia, Viale Europa 11, 25121, Brescia, Italy
| | - Vladimiro Mujica
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA.,Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), P.K. 1072, 20018, Donostia, Euskadi, Spain.,Departamento de Fisicoquímica, Universidad de Granada (UGR), (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Alba Millán
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | | | - Linda A Zotti
- Departamento de Física Teórica de la Materia Condensada and IFIMAC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
| | - Delia Miguel
- Departamento de Fisicoquímica, Universidad de Granada (UGR), (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Juan M Cuerva
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
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6
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Montenegro D, González MT, Hickey T, Rahnama M, Green S, Lear G. Assessing integrated biomarkers of triplefin fish Forsterygion capito inhabiting contaminated marine water - A multivariate approach. Chemosphere 2022; 288:132590. [PMID: 34662640 DOI: 10.1016/j.chemosphere.2021.132590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 09/20/2021] [Accepted: 10/14/2021] [Indexed: 06/13/2023]
Abstract
The presence of multiple chemicals in aquatic ecosystems makes evaluation of their real impact on the biota difficult. Integrated biomarkers are therefore needed to evaluate how these chemicals contribute to environmental degradation. The aims of the present study were to evaluate responses to and effects of marine pollution using a series of biomarkers through multivariate analyses. Transcriptional responses of cyp1a (cytochrome P450), mt (metallothionein), vtg (vitellogenin) and cyp19b (cytochrome P450 aromatase); branchial and hepatic histological alterations; and Fulton condition factors (CF) were evaluated, as well as the metals and polycyclic aromatic hydrocarbons present in Forsterygion capito in Auckland, New Zealand. Sites were selected along a contamination gradient: four highly contaminated sites and four less contaminated. Molecular responses with a higher relative expression of the mt and cyp1a genes were detected at a highly contaminated site (Panmure). Several histological lesion types were found in the livers of fish inhabiting both types of sites, but gill lesions were present primarily at highly contaminated sites. In terms of general health status, the lowest CF values were overwhelmingly found in fish from the same site (Panmure). The multivariate approach revealed that telangiectasia and hyperplasia were associated with the presence of chemicals, and these showed negative associations with the CF values, with fish from three highly contaminated sites being most affected. In conclusion, the multivariate approach helped to integrate these biological markers in this blennioid fish, thus providing a more holistic view of the complex chemical mixtures involved. Future studies should implement these analyses.
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Affiliation(s)
- Diana Montenegro
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand; Natural Science Institute Alexander von Humboldt, Faculty of Marine Sciences and Biological Resources, University of Antofagasta, Antofagasta, Chile.
| | - M Teresa González
- Natural Science Institute Alexander von Humboldt, Faculty of Marine Sciences and Biological Resources, University of Antofagasta, Antofagasta, Chile
| | - Tony Hickey
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand
| | - Mostafa Rahnama
- Department of Plant Pathology, University of Kentucky, Lexington, 40546, USA
| | - Saras Green
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand
| | - Gavin Lear
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand
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Xu W, Leary E, Sangtarash S, Jirasek M, González MT, Christensen KE, Abellán Vicente L, Agraït N, Higgins SJ, Nichols RJ, Lambert CJ, Anderson HL. A Peierls Transition in Long Polymethine Molecular Wires: Evolution of Molecular Geometry and Single-Molecule Conductance. J Am Chem Soc 2021; 143:20472-20481. [PMID: 34817985 DOI: 10.1021/jacs.1c10747] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Molecules capable of mediating charge transport over several nanometers with minimal decay in conductance have fundamental and technological implications. Polymethine cyanine dyes are fascinating molecular wires because up to a critical length, they have no bond-length alternation (BLA) and their electronic structure resembles a one-dimensional free-electron gas. Beyond this threshold, they undergo a symmetry-breaking Peierls transition, which increases the HOMO-LUMO gap. We have investigated cationic cyanines with central polymethine chains of 5-13 carbon atoms (Cy3+-Cy11+). The absorption spectra and crystal structures show that symmetry breaking is sensitive to the polarity of the medium and the size of the counterion. X-ray crystallography reveals that Cy9·PF6 and Cy11·B(C6F5)4 are Peierls distorted, with high BLA at one end of the π-system, away from the partially delocalized positive charge. This pattern of BLA distribution resembles that of solitons in polyacetylene. The single-molecule conductance is essentially independent of molecular length for the polymethine salts of Cy3+-Cy11+ with the large B(C6F5)4- counterion, but with the PF6- counterion, the conductance decreases for the longer molecules, Cy7+-Cy11+, because this smaller anion polarizes the π-system, inducing a symmetry-breaking transition. At higher bias (0.9 V), the conductance of the shorter chains, Cy3+-Cy7+, increases with length (negative attenuation factor, β = -1.6 nm-1), but the conductance still drops in Cy9+ and Cy11+ with the small polarizing PF6- counteranion.
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Affiliation(s)
- Wenjun Xu
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Edmund Leary
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Sara Sangtarash
- School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Michael Jirasek
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - M Teresa González
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Kirsten E Christensen
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Lydia Abellán Vicente
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Nicolás Agraït
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain.,Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Simon J Higgins
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
| | - Richard J Nichols
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
| | - Colin J Lambert
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Harry L Anderson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom
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8
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Domínguez-Bajo A, Rosa JM, González-Mayorga A, Rodilla BL, Arché-Núñez A, Benayas E, Ocón P, Pérez L, Camarero J, Miranda R, González MT, Aguilar J, López-Dolado E, Serrano MC. Nanostructured gold electrodes promote neural maturation and network connectivity. Biomaterials 2021; 279:121186. [PMID: 34700221 DOI: 10.1016/j.biomaterials.2021.121186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 10/05/2021] [Accepted: 10/12/2021] [Indexed: 12/22/2022]
Abstract
Progress in the clinical application of recording and stimulation devices for neural diseases is still limited, mainly because of suboptimal material engineering and unfavorable interactions with biological entities. Nanotechnology is providing upgraded designs of materials to better mimic the native extracellular environment and attain more intimate contacts with individual neurons, besides allowing for the miniaturization of the electrodes. However, little progress has been done to date on the understanding of the biological impact that such neural interfaces have on neural network maturation and functionality. In this work, we elucidate the effect of a gold (Au) highly ordered nanostructure on the morphological and functional interactions with neural cells and tissues. Alumina-templated Au nanostructured electrodes composed of parallel nanowires of 160 nm in diameter and 1.2 μm in length (Au-NWs), with 320 nm of pitch, are designed and characterized. Equivalent non-structured Au electrodes (Au-Flat) are used for comparison. By using diverse techniques in in vitro cell cultures including live calcium imaging, we found that Au-NWs interfaced with primary neural cortical cells for up to 14 days allow neural networks growth and increase spontaneous activity and ability of neuronal synchronization, thus indicating that nanostructured features favor neuronal network. The enhancement in the number of glial cells found is hypothesized to be behind these beneficial functional effects. The in vivo effect of the implantation of these nanostructured electrodes and its potential relevance for future clinical applicability has been explored in an experimental model of rat spinal cord injury. Subacute responses to implanted Au-NWs show no overt reactive or toxic biological reactions besides those triggered by the injury itself. These results highlight the translational potential of Au-NWs electrodes for in vivo applications as neural interfaces in contact with central nervous tissues including the injured spinal cord.
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Affiliation(s)
- Ana Domínguez-Bajo
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
| | - Juliana M Rosa
- Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain
| | | | - Beatriz L Rodilla
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain; Departamento de Física de Materiales, Universidad Complutense de Madrid, Plaza de las Ciencias s/n, 28040, Madrid, Spain
| | - Ana Arché-Núñez
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain
| | - Esther Benayas
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
| | - Pilar Ocón
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Lucas Pérez
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain; Departamento de Física de Materiales, Universidad Complutense de Madrid, Plaza de las Ciencias s/n, 28040, Madrid, Spain
| | - Julio Camarero
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain; Instituto "Nicolás Cabrera" and Condensed Matter Physics Center (IFIMAC), Departamento de Física de la Materia Condensada, Universidad Autonoma de Madrid, Madrid, 28049, Spain
| | - Rodolfo Miranda
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain; Instituto "Nicolás Cabrera" and Condensed Matter Physics Center (IFIMAC), Departamento de Física de la Materia Condensada, Universidad Autonoma de Madrid, Madrid, 28049, Spain
| | - M Teresa González
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Calle Faraday 9, 28049, Madrid, Spain
| | - Juan Aguilar
- Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain; Research Unit of "Design and development of biomaterials for neural regeneration", Hospital Nacional de Parapléjicos, Joint Research Unit with CSIC, Finca La Peraleda s/n, 45071, Toledo, Spain
| | - Elisa López-Dolado
- Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain; Research Unit of "Design and development of biomaterials for neural regeneration", Hospital Nacional de Parapléjicos, Joint Research Unit with CSIC, Finca La Peraleda s/n, 45071, Toledo, Spain
| | - María C Serrano
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Calle Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain.
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9
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Xu W, Leary E, Hou S, Sangtarash S, González MT, Rubio‐Bollinger G, Wu Q, Sadeghi H, Tejerina L, Christensen KE, Agraït N, Higgins SJ, Lambert CJ, Nichols RJ, Anderson HL. Berichtigung: Unusual Length Dependence of the Conductance in Cumulene Molecular Wires. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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Xu W, Leary E, Hou S, Sangtarash S, González MT, Rubio-Bollinger G, Wu Q, Sadeghi H, Tejerina L, Christensen KE, Agraït N, Higgins SJ, Lambert CJ, Nichols RJ, Anderson HL. Corrigendum: Unusual Length Dependence of the Conductance in Cumulene Molecular Wires. Angew Chem Int Ed Engl 2021; 60:9170. [PMID: 33844403 PMCID: PMC8173639 DOI: 10.1002/anie.202102667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Mejias SH, López-Martínez E, Fernandez M, Couleaud P, Martin-Lasanta A, Romera D, Sanchez-Iglesias A, Casado S, Osorio MR, Abad JM, González MT, Cortajarena AL. Engineering conductive protein films through nanoscale self-assembly and gold nanoparticles doping. Nanoscale 2021; 13:6772-6779. [PMID: 33885479 DOI: 10.1039/d1nr00238d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Protein-based materials are usually considered as insulators, although conductivity has been recently shown in proteins. This fact opens the door to develop new biocompatible conductive materials. While there are emerging efforts in this area, there is an open challenge related to the limited conductivity of protein-based systems. This work shows a novel approach to tune the charge transport properties of protein-based materials by using electron-dense AuNPs. Two strategies are combined in a unique way to generate the conductive solid films: (1) the controlled self-assembly of a protein building block; (2) the templating of AuNPs by the engineered building block. This bottom-up approach allows controlling the structure of the films and the distribution of the AuNPs within, leading to enhanced conductivity. This work illustrates a promising strategy for the development of effective hybrid protein-based bioelectrical materials.
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Affiliation(s)
- Sara H Mejias
- IMDEA Nanociencia, Campus Universitario de Cantoblanco, C\Faraday, 9, 28049 Madrid, Spain.
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12
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Palomino‐Ruiz L, Rodríguez‐González S, Fallaque JG, Márquez IR, Agraït N, Díaz C, Leary E, Cuerva JM, Campaña AG, Martín F, Millán A, González MT. Single‐Molecule Conductance of 1,4‐Azaborine Derivatives as Models of BN‐doped PAHs. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lucía Palomino‐Ruiz
- Departamento de Química Orgánica Facultad de Ciencias Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) Universidad de Granada 18071 Granada Spain
- Fundación IMDEA Nanociencia 28049 Madrid Spain
| | - Sandra Rodríguez‐González
- Departamento de Química, Módulo 13 Universidad Autónoma de Madrid 28049 Madrid Spain
- Present address: Departamento de Química Física Facultad de Ciencias Universidad de Málaga 29071 Málaga Spain
| | | | - Irene R. Márquez
- Departamento de Química Orgánica Facultad de Ciencias Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) Universidad de Granada 18071 Granada Spain
- Centro de Instrumentación Científica Universidad de Granada 18071 Granada Spain
| | - Nicolás Agraït
- Fundación IMDEA Nanociencia 28049 Madrid Spain
- Departamento de Física de la Materia Condensada Universidad Autónoma de Madrid 28049 Madrid Spain
- Condensed Matter Physics Center (IFIMAC) Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Cristina Díaz
- Departamento de Química, Módulo 13 Universidad Autónoma de Madrid 28049 Madrid Spain
- Present address: Departamento de Química Física Facultad de CC. Químicas Universidad Complutense de Madrid 28040 Madrid Spain
| | | | - Juan M. Cuerva
- Departamento de Química Orgánica Facultad de Ciencias Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) Universidad de Granada 18071 Granada Spain
| | - Araceli G. Campaña
- Departamento de Química Orgánica Facultad de Ciencias Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) Universidad de Granada 18071 Granada Spain
| | - Fernando Martín
- Fundación IMDEA Nanociencia 28049 Madrid Spain
- Departamento de Química, Módulo 13 Universidad Autónoma de Madrid 28049 Madrid Spain
- Condensed Matter Physics Center (IFIMAC) Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Alba Millán
- Departamento de Química Orgánica Facultad de Ciencias Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) Universidad de Granada 18071 Granada Spain
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13
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Palomino-Ruiz L, Rodríguez-González S, Fallaque JG, Márquez IR, Agraït N, Díaz C, Leary E, Cuerva JM, Campaña AG, Martín F, Millán A, González MT. Single-Molecule Conductance of 1,4-Azaborine Derivatives as Models of BN-doped PAHs. Angew Chem Int Ed Engl 2021; 60:6609-6616. [PMID: 33348468 DOI: 10.1002/anie.202014194] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 12/02/2020] [Indexed: 01/06/2023]
Abstract
The single-molecule conductance of a series of BN-acene-like derivatives has been measured by using scanning tunneling break-junction techniques. A strategic design of the target molecules has allowed us to include azaborine units in positions that unambiguously ensure electron transport through both heteroatoms, which is relevant for the development of customized BN-doped nanographenes. We show that the conductance of the anthracene azaborine derivative is comparable to that of the pristine all-carbon anthracene compound. Notably, this heteroatom substitution has also allowed us to perform similar measurements on the corresponding pentacene-like compound, which is found to have a similar conductance, thus evidencing that B-N doping could also be used to stabilize and characterize larger acenes for molecular electronics applications. Our conclusions are supported by state-of-the-art transport calculations.
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Affiliation(s)
- Lucía Palomino-Ruiz
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ), Universidad de Granada, 18071, Granada, Spain.,Fundación IMDEA Nanociencia, 28049, Madrid, Spain
| | - Sandra Rodríguez-González
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Present address: Departamento de Química Física, Facultad de Ciencias, Universidad de Málaga, 29071, Málaga, Spain
| | | | - Irene R Márquez
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ), Universidad de Granada, 18071, Granada, Spain.,Centro de Instrumentación Científica, Universidad de Granada, 18071, Granada, Spain
| | - Nicolás Agraït
- Fundación IMDEA Nanociencia, 28049, Madrid, Spain.,Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Cristina Díaz
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Present address: Departamento de Química Física, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Edmund Leary
- Fundación IMDEA Nanociencia, 28049, Madrid, Spain
| | - Juan M Cuerva
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ), Universidad de Granada, 18071, Granada, Spain
| | - Araceli G Campaña
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ), Universidad de Granada, 18071, Granada, Spain
| | - Fernando Martín
- Fundación IMDEA Nanociencia, 28049, Madrid, Spain.,Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Alba Millán
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ), Universidad de Granada, 18071, Granada, Spain
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14
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Leary E, Kastlunger G, Limburg B, Rincón-García L, Hurtado-Gallego J, González MT, Bollinger GR, Agrait N, Higgins SJ, Anderson HL, Stadler R, Nichols RJ. Long-lived charged states of single porphyrin-tape junctions under ambient conditions. Nanoscale Horiz 2021; 6:49-58. [PMID: 33107543 DOI: 10.1039/d0nh00415d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The ability to control the charge state of individual molecules wired in two-terminal single-molecule junctions is a key challenge in molecular electronics, particularly in relation to the development of molecular memory and other computational componentry. Here we demonstrate that single porphyrin molecular junctions can be reversibly charged and discharged at elevated biases under ambient conditions due to the presence of a localised molecular eigenstate close to the Fermi edge of the electrodes. In particular, we can observe long-lived charge-states with lifetimes upwards of 1-10 seconds after returning to low bias and large changes in conductance, in excess of 100-fold at low bias. Our theoretical analysis finds charge-state lifetimes within the same time range as the experiments. The ambient operation demonstrates that special conditions such as low temperatures or ultra-high vacuum are not essential to observe hysteresis and stable charged molecular junctions.
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Affiliation(s)
- Edmund Leary
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
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15
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Schmidt M, Wassy D, Hermann M, González MT, Agräit N, Zotti LA, Esser B, Leary E. Single-molecule conductance of dibenzopentalenes: antiaromaticity and quantum interference. Chem Commun (Camb) 2021; 57:745-748. [PMID: 33346282 DOI: 10.1039/d0cc06810a] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of antiaromaticity and destructive quantum interference (DQI) are investigated on the charge transport through dibenzo-[a,e]pentalene (DBP). 5,10-Connectivity gives high single-molecule conductance whereas 2,7 gives low conductance due to DQI. Comparison of the 5,10-DBP with phenyl and anthracene analogues yields the trend GDBP ≈ GAnth > GPh, despite the aromatic anthracene having a larger HOMO-LUMO gap than 5,10-DBP. This is explained by unfavourable level alignment for 5,10-DBP.
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Affiliation(s)
- Maximilian Schmidt
- Institute for Organic Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany.
| | - Daniel Wassy
- Institute for Organic Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany.
| | - Mathias Hermann
- Institute for Organic Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany.
| | - M Teresa González
- Instituto Madrileño de Estudios Avanzados (IMDEA), Campus Universitario de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain.
| | - Nicolás Agräit
- Instituto Madrileño de Estudios Avanzados (IMDEA), Campus Universitario de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain. and Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049, Madrid, Spain
| | - Linda A Zotti
- Departamento de Física Aplicada I, Escuela Politécnica Superior, Universidad de Sevilla, Seville, E-41011, Spain. and Departamento de Física Teórica de la Materia Condensada and IFIMAC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Birgit Esser
- Institute for Organic Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany. and Freiburg Materials Research Center, University of Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg, Germany and Cluster of Excellence livMatS @ FIT - Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany
| | - Edmund Leary
- Instituto Madrileño de Estudios Avanzados (IMDEA), Campus Universitario de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain.
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16
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Martín-Lázaro J, Núñez-Orjales R, González-Guzmán LA, González MT, Boquete M, Carballada F. Galactose-α-1,3-galactose (alpha-gal) allergy: first pediatric case in a series of patients in Spain. Allergol Immunopathol (Madr) 2020; 48:251-258. [PMID: 31718865 DOI: 10.1016/j.aller.2019.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 07/26/2019] [Indexed: 11/20/2022]
Abstract
INTRODUCTION AND OBJECTIVES Allergy to galactose-α-1,3-galactose (alpha-gal) is a peculiar form of food allergy generally manifesting as an anaphylactic reaction hours after mammalian meat consumption, due to the presence of specific IgE against this oligosaccharide. In addition, immediate anaphylaxis may develop after exposure to other sources of alpha-gal, such as monoclonal antibody cetuximab, vaccines, plasma expanders or anti-snake venoms. Sensitization to alpha-gal has also been implicated in the rapid degeneration of biological valve implants, and recognized as a cause of occupational disease in cattle raisers. The implication of tick bites in this type of sensitization has been accepted by all the research groups dedicated to this disease. PATIENTS AND METHOD The present study describes the clinical and sensitization characteristics of 39 patients diagnosed with alpha-gal allergy in the hospitals of our province (Lugo, Monforte de Lemos and Burela, Spain). RESULTS Most patients were middle-age males. Of note, is the fact that the series includes the first pediatric patient reported in Spain to date. The predominant clinical manifestations were urticaria or delayed anaphylaxis after consumption of mammalian meat. Seventy-four percent of the patients reported having suffered a previous tick bite, and the clinical presentation of anaphylaxis was significantly more prevalent in those with a persistent local reaction following the bite than in those with no such reaction (p = 0.032). CONCLUSIONS A review is also made of the disorder which, due to its variable clinical expression, is referred to as alpha-gal syndrome. The study concludes that a diagnosis of alpha-gal allergy should be considered in patients with urticaria-anaphylaxis of uncertain origin or manifesting after the administration of vaccines or products of bovine/porcine origin.
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Affiliation(s)
- J Martín-Lázaro
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain.
| | - R Núñez-Orjales
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain
| | - L A González-Guzmán
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain
| | - M T González
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain
| | - M Boquete
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain
| | - F Carballada
- Allergy Section, Estructura Organizativa Integrada de Lugo, Cervo y Monforte. Lugo, Spain
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Espínola‐Novelo JF, González MT, Pacheco AS, Luque JL, Oliva ME. Testing for deterministic succession in metazoan parasite communities of marine fish. Ecol Lett 2020; 23:631-641. [DOI: 10.1111/ele.13463] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 09/02/2019] [Accepted: 12/27/2019] [Indexed: 11/30/2022]
Affiliation(s)
- Juan F. Espínola‐Novelo
- Programa de Doctorado en Ciencias Aplicadas mención Sistemas Marinos Costeros Universidad de Antofagasta P.O. Box 170 Antofagasta Chile
- Instituto de Ciencias Naturales Alexander von Humboldt Universidad de Antofagasta P.O. Box 170 Antofagasta Chile
| | - M. Teresa González
- Instituto de Ciencias Naturales Alexander von Humboldt Universidad de Antofagasta P.O. Box 170 Antofagasta Chile
| | - Aldo S. Pacheco
- Facultad de Ciencias Veterinarias y Biológicas Universidad Científica del Sur Lima Perú
| | - José L. Luque
- Departamento de Parasitología Animal Universidad Federal Rural Rio de Janeiro Seropedica Brazil
| | - Marcelo E. Oliva
- Instituto de Ciencias Naturales Alexander von Humboldt Universidad de Antofagasta P.O. Box 170 Antofagasta Chile
- Instituto Milenio de Oceanografía (IMO) Universidad de Concepción P.O. Box 160‐C Concepción Chile
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18
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Ramos R, Moreso F, Borras M, Ponz E, Buades JM, Teixidó J, Morey A, Garcia C, Vera M, Doñate MT, de Arellano MR, Barbosa F, González MT. Sevelamer Hydrochloride in Peritoneal Dialysis Patients: Results of a Multicenter Cross-Sectional Study. Perit Dial Int 2020. [DOI: 10.1177/089686080702700618] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Sevelamer hydrochloride is a phosphate binder widely employed in hemodialysis patients. Until now, information about its efficacy and safety in peritoneal dialysis patients has been scarce. Patients and Methods In September 2005 a cross-sectional study of demographic, biochemical, and therapeutic data of patients from 10 peritoneal dialysis units in Catalonia and the Balearic Islands, Spain, was conducted. Results We analyzed data from 228 patients. At the time of the study, 128 patients (56%) were receiving sevelamer. Patients receiving sevelamer were younger ( p < 0.01), showed a longer period of time on dialysis ( p < 0.01), and had a lower Charlson Comorbidity Index ( p < 0.01). Serum calcium and intact parathyroid hormone levels were not different between the two groups, while phosphate levels <5.5 mg/dL were observed more frequently in patients not receiving sevelamer (79% vs 61%, p < 0.01). Serum total cholesterol (167 ± 41 vs 189 ± 42 mg/dL, p < 0.01) and low density lipoprotein (LDL) cholesterol (90 ± 34 vs 109 ± 34 mg/dL, p < 0.01), but not high density lipoprotein cholesterol or triglycerides, were lower in sevelamer-treated patients. Moreover, sevelamer-treated patients displayed a higher serum albumin (38 ± 5 vs 36 ± 4 g/L, p < 0.01) and a lower C-reactive protein (4.9 ± 12.8 vs 8.8 ± 15.7 mg/L, p < 0.01). Blood bicarbonate levels <22 mmol/L were observed more frequently in patients receiving sevelamer (22% vs 5%, p < 0.01). Logistic regression analysis adjusting by confounding variables confirmed that sevelamer therapy was associated with serum total cholesterol <200 mg/dL [relative risk (RR): 2.77, 95% confidence interval (CI): 1.44 – 5.26, p = 0.002] and blood bicarbonate <22 mmol/L (RR: 8.5, 95% CI: 2.6 – 27.0, p < 0.001), but not with serum phosphate >5.5 mg/dL, calcium–phosphate product >55 mg2/dL2, serum albumin <35 g/L, or C-reactive protein >5 mg/L. Conclusions This uncontrolled cross-sectional study in peritoneal dialysis patients showed that sevelamer hydro-chloride treatment allows an adequate serum phosphate level in about 60% of patients and significantly reduces total and LDL-cholesterol levels. Since this treatment is associated with metabolic acidosis in 22% of patients, we recommend close monitoring of bicarbonate levels in this group of patients until the clinical significance of this result is clarified.
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Affiliation(s)
- Rosa Ramos
- Servei de Nefrologia, Hospital Universitari de Bellvitge, L'Hospitalet, Barcelona
| | - Francesc Moreso
- Servei de Nefrologia, Hospital Universitari de Bellvitge, L'Hospitalet, Barcelona
| | | | | | | | | | | | | | | | | | | | | | - M. Teresa González
- Servei de Nefrologia, Hospital Universitari de Bellvitge, L'Hospitalet, Barcelona
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Baeza JA, Sepúlveda FA, González MT. The complete mitochondrial genome and description of a new cryptic species of Benedenia Diesing, 1858 (Monogenea: Capsalidae), a major pathogen infecting the yellowtail kingfish Seriola lalandi Valenciennes in the South-East Pacific. Parasit Vectors 2019; 12:490. [PMID: 31623679 PMCID: PMC6798380 DOI: 10.1186/s13071-019-3711-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 09/11/2019] [Indexed: 01/19/2023] Open
Abstract
Background The monogenean Benedenia seriolae parasitizes fishes belonging to the genus Seriola, represents a species complex, and causes substantial impact on fish welfare in aquaculture systems worldwide. This study reports, for the first time, the complete mitochondrial genome of B. humboldti n. sp., a new cryptic species from the South-East Pacific (SEP). Methods The mitogenome of B. humboldti n. sp. was assembled from short Illumina 150 bp pair-end reads. The phylogenetic position of B. humboldti n. sp. among other closely related congeneric and confamiliar capsalids was examined using mitochondrial protein-coding genes (PCGs). Morphology of B. humboldti n. sp. was examined based on fixed and stained specimens. Results The AT-rich mitochondrial genome of B. humboldti is 13,455 bp in length and comprises 12 PCGs (atp8 was absent as in other monogenean genomes), 2 ribosomal RNA genes, and 22 transfer RNA genes. All protein-coding, ribosomal RNA, and transfer RNA genes are encoded on the H-strand. The gene order observed in the mitochondrial genome of B. humboldti n. sp. was identical to that of B. seriolae from Japan but different from that of B. seriolae from Australia. The genetic distance between B. humboldti n. sp. and B. seriolae from Japan was high. Minor but reliable differences in the shape of the penis were observed between Benedenia humboldti n. sp. and congeneric species. Conclusions Phylogenetic analyses based on PCGs in association with differences in the shape of the penis permitted us to conclude that the material from the South-East Pacific represents a new species of Benedenia infecting S. lalandi off the coast of Chile. The discovery of this parasite represents the first step to improving our understanding of infestation dynamics and to develop control strategies for this pathogen infecting the farmed yellowtail kingfish, Seriola lalandi, in the South-East Pacific.![]()
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Affiliation(s)
- J Antonio Baeza
- Department of Biological Sciences, Clemson University, 132 Long Hall, Clemson, SC, 29634, USA. .,Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, Florida, 34949, USA. .,Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile.
| | - Fabiola A Sepúlveda
- Laboratorio Eco-parasitologia y Epidemiologia Marina (LEPyEM), Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biologicos, Universidad de Antofagasta, Angamos 601, Antofagasta, Chile
| | - M Teresa González
- Laboratorio Eco-parasitologia y Epidemiologia Marina (LEPyEM), Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biologicos, Universidad de Antofagasta, Angamos 601, Antofagasta, Chile.
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20
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Alanazy A, Leary E, Kobatake T, Sangtarash S, González MT, Jiang HW, Bollinger GR, Agräit N, Sadeghi H, Grace I, Higgins SJ, Anderson HL, Nichols RJ, Lambert CJ. Cross-conjugation increases the conductance of meta-connected fluorenones. Nanoscale 2019; 11:13720-13724. [PMID: 31298678 DOI: 10.1039/c9nr01235d] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Charge transport is strongly suppressed by destructive quantum interference (DQI) in meta-connected 1,1'-biphenyl-containing molecules, resulting in low electrical conductance. Surprisingly, we have found that DQI is almost entirely overcome by adding a bridging carbonyl, to yield a cross-conjugated fluorenone. This contrasts with other π-systems, such as para-connected anthraquinone, where cross-conjugation results in low conductance.
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Affiliation(s)
- Asma Alanazy
- The Department of Mathematics, Lancaster University, LA1 4YF, UK
| | - Edmund Leary
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, UK. and Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK. and Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Takayuki Kobatake
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Sara Sangtarash
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - M Teresa González
- Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Hua-Wei Jiang
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Gabino Rubio Bollinger
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Nicolás Agräit
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Fundación IMDEA Nanociencia, Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Hatef Sadeghi
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - Iain Grace
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
| | - Simon J Higgins
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
| | - Harry L Anderson
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK
| | - Richard J Nichols
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, UK. and Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, UK.
| | - Colin J Lambert
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
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21
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Xu W, Leary E, Hou S, Sangtarash S, González MT, Rubio‐Bollinger G, Wu Q, Sadeghi H, Tejerina L, Christensen KE, Agraït N, Higgins SJ, Lambert CJ, Nichols RJ, Anderson HL. Unusual Length Dependence of the Conductance in Cumulene Molecular Wires. Angew Chem Int Ed Engl 2019; 58:8378-8382. [PMID: 31026371 PMCID: PMC6563095 DOI: 10.1002/anie.201901228] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 04/22/2019] [Indexed: 01/29/2023]
Abstract
Cumulenes are sometimes described as "metallic" because an infinitely long cumulene would have the band structure of a metal. Herein, we report the single-molecule conductance of a series of cumulenes and cumulene analogues, where the number of consecutive C=C bonds in the core is n=1, 2, 3, and 5. The [n]cumulenes with n=3 and 5 have almost the same conductance, and they are both more conductive than the alkene (n=1). This is remarkable because molecular conductance normally falls exponentially with length. The conductance of the allene (n=2) is much lower, because of its twisted geometry. Computational simulations predict a similar trend to the experimental results and indicate that the low conductance of the allene is a general feature of [n]cumulenes where n is even. The lack of length dependence in the conductance of [3] and [5]cumulenes is attributed to the strong decrease in the HOMO-LUMO gap with increasing length.
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Affiliation(s)
- Wenjun Xu
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOxfordOX1 3TAUK
| | - Edmund Leary
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of LiverpoolLiverpoolL69 7ZDUK
- Surface Science Research CentreUniversity of LiverpoolOxford StreetLiverpoolL69 3BXUK
| | - Songjun Hou
- Department of PhysicsLancaster UniversityLancasterLA1 4YWUK
| | | | - M. Teresa González
- Instituto Madrileño de Estudios Avanzados (IMDEA)Calle Faraday 9, Campus Universitario de Cantoblanco28049MadridSpain
| | - Gabino Rubio‐Bollinger
- Departamento de Física de la Materia CondensadaIFIMAC and Instituto “Nicolás Cabrera”Universidad Autónoma de Madrid28049MadridSpain
| | - Qingqing Wu
- Department of PhysicsLancaster UniversityLancasterLA1 4YWUK
| | - Hatef Sadeghi
- Department of PhysicsLancaster UniversityLancasterLA1 4YWUK
| | - Lara Tejerina
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOxfordOX1 3TAUK
| | | | - Nicolás Agraït
- Instituto Madrileño de Estudios Avanzados (IMDEA)Calle Faraday 9, Campus Universitario de Cantoblanco28049MadridSpain
- Departamento de Física de la Materia CondensadaIFIMAC and Instituto “Nicolás Cabrera”Universidad Autónoma de Madrid28049MadridSpain
| | - Simon J. Higgins
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of LiverpoolLiverpoolL69 7ZDUK
| | | | - Richard J. Nichols
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of LiverpoolLiverpoolL69 7ZDUK
- Surface Science Research CentreUniversity of LiverpoolOxford StreetLiverpoolL69 3BXUK
| | - Harry L. Anderson
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOxfordOX1 3TAUK
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22
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Xu W, Leary E, Hou S, Sangtarash S, González MT, Rubio‐Bollinger G, Wu Q, Sadeghi H, Tejerina L, Christensen KE, Agraït N, Higgins SJ, Lambert CJ, Nichols RJ, Anderson HL. Unusual Length Dependence of the Conductance in Cumulene Molecular Wires. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wenjun Xu
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Oxford OX1 3TA UK
| | - Edmund Leary
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of Liverpool Liverpool L69 7ZD UK
- Surface Science Research CentreUniversity of Liverpool Oxford Street Liverpool L69 3BX UK
| | - Songjun Hou
- Department of PhysicsLancaster University Lancaster LA1 4YW UK
| | - Sara Sangtarash
- Department of PhysicsLancaster University Lancaster LA1 4YW UK
| | - M. Teresa González
- Instituto Madrileño de Estudios Avanzados (IMDEA) Calle Faraday 9, Campus Universitario de Cantoblanco 28049 Madrid Spain
| | - Gabino Rubio‐Bollinger
- Departamento de Física de la Materia CondensadaIFIMAC and Instituto “Nicolás Cabrera”Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Qingqing Wu
- Department of PhysicsLancaster University Lancaster LA1 4YW UK
| | - Hatef Sadeghi
- Department of PhysicsLancaster University Lancaster LA1 4YW UK
| | - Lara Tejerina
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Oxford OX1 3TA UK
| | - Kirsten E. Christensen
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Oxford OX1 3TA UK
| | - Nicolás Agraït
- Instituto Madrileño de Estudios Avanzados (IMDEA) Calle Faraday 9, Campus Universitario de Cantoblanco 28049 Madrid Spain
- Departamento de Física de la Materia CondensadaIFIMAC and Instituto “Nicolás Cabrera”Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Simon J. Higgins
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of Liverpool Liverpool L69 7ZD UK
| | | | - Richard J. Nichols
- Department of ChemistryDonnan and Robert Robinson LaboratoriesUniversity of Liverpool Liverpool L69 7ZD UK
- Surface Science Research CentreUniversity of Liverpool Oxford Street Liverpool L69 3BX UK
| | - Harry L. Anderson
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Oxford OX1 3TA UK
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23
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Aguilera VM, Escribano R, Vargas CA, González MT. Upwelling modulation of functional traits of a dominant planktonic grazer during "warm-acid" El Niño 2015 in a year-round upwelling area of Humboldt Current. PLoS One 2019; 14:e0209823. [PMID: 30640913 PMCID: PMC6331177 DOI: 10.1371/journal.pone.0209823] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 12/12/2018] [Indexed: 11/18/2022] Open
Abstract
Climate change is expected to exacerbate upwelling intensity and natural acidification in Eastern Boundaries Upwelling Systems (EBUS). Conducted between January-September 2015 in a nearshore site of the northern Humboldt Current System directly exposed to year-round upwelling episodes, this study was aimed at assessing the relationship between upwelling mediated pH-changes and functional traits of the numerically dominant planktonic copepod-grazer Acartia tonsa (Copepoda). Environmental temperature, salinity, oxygen, pH, alkalinity, chlorophyll-a (Chl), copepod adult size, egg production (EP), and egg size and growth were assessed through 28 random oceanographic surveys. Agglomerative clustering and multidimensional scaling identified three main di-similitude nodes within temporal variability of abiotic and biotic variables: A) “upwelling”, B) “non-upwelling”, and C) “warm-acid” conditions. Nodes A and B represented typical features within the upwelling phenology, characterized by the transition from low temperature, oxygen, pH and Chl during upwelling to higher levels during non-upwelling conditions. However, well-oxygenated, saline and “warm-acid” node C seemed to be atypical for local climatology, suggesting the occurrence of a low frequency oceanographic perturbation. Multivariate (LDA and ANCOVA) analyses revealed upwelling through temperature, oxygen and pH were the main factors affecting variations in adult size and EP, and highlighted growth rates were significantly lower under node C. Likely buffering upwelling pH-reductions, phytoplankton biomass maintained copepod reproduction despite prevailing low temperature, oxygen and pH levels in the upwelling setting. Helping to better explain why this species is among the most recurrent ones in these variable yet productive upwelling areas, current findings also provide opportune cues on plankton responses under warm-acid conditions, which are expected to occur in productive EBUS as a consequence of climate perturbations.
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Affiliation(s)
- Victor M. Aguilera
- Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile
- Facultad de Ciencias del Mar, Depto. Biología Marina, Universidad Católica del Norte, Coquimbo, Chile
- Instituto Milenio de Oceanografía and Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
- * E-mail:
| | - Ruben Escribano
- Instituto Milenio de Oceanografía and Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
| | - Cristian A. Vargas
- Instituto Milenio de Oceanografía and Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
- Aquatic Ecosystem Functioning Lab (LAFE), Department of Aquatic Systems, Faculty of Environmental Sciences and Environmental Sciences Center EULA Chile, Universidad de Concepción, Concepción, Chile
- Center for the Study of Multiple-drivers on Marine Socio-Ecological Systems (MUSELS), Universidad de Concepción, Concepción, Chile
| | - M. Teresa González
- Instituto de Ciencias Naturales Alexander von Humboldt, Universidad de Antofagasta, Antofagasta, Chile
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24
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Leiva NV, Manríquez PH, Aguilera VM, González MT. Temperature and pCO 2 jointly affect the emergence and survival of cercariae from a snail host: implications for future parasitic infections in the Humboldt Current system. Int J Parasitol 2018; 49:49-61. [PMID: 30447200 DOI: 10.1016/j.ijpara.2018.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 08/19/2018] [Accepted: 08/21/2018] [Indexed: 10/27/2022]
Abstract
Ocean warming and acidification are general consequences of rising atmospheric CO2 concentrations. In addition to future predictions, highly productive systems such as the Humboldt Current System are characterized by important variations in both temperature and pCO2 level, but how these physical-chemical ocean changes might influence the transmission and survival of parasites has not been assessed. This study experimentally evaluated the effects of temperature (14, 18 and 25 °C) and the combined effects of temperature (∼15 and 20 °C) and pCO2 level (∼500 and 1400 microatmospheres (µatm) on the emergence and survival of two species of marine trematodes-Echinostomatidae gen. sp. and Philophthalmidae gen. sp.-both of which infect the intertidal snail Echinolittorina peruviana. Snails were collected from intertidal rocky pools in a year-round upwelling area of the northern Humboldt Current System (23°S). Two experiments assessed parasite emergence and survival by simulating emersion-immersion tidal cycles. To assess parasite survival, 2 h old cercariae (on average) were taken from a pool of infected snails incubated at 20-25 °C, and their mortality was recorded every 6 h until all the cercariae were dead. For both species, a trade-off between high emergence and low survival of cercariae was observed in the high temperature treatment. Species-specific responses to the combination of temperature and pCO2 levels were also observed: the emergence of Echinostomatidae cercariae was highest at 20 °C regardless of the pCO2 levels. By contrast, the emergence of Philophthalmidae cercariae was highest at elevated pCO2 (15 and 20 °C), suggesting that CO2 may react synergistically with temperature, increasing transmission success of this parasite in coastal ecosystems of the Humboldt Current System where water temperature and pH are expected to decrease. In conclusion, our results suggest that integrating temperature-pCO2 interactions in parasite studies is essential for understanding the consequence of climate change in future marine ecosystem health.
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Affiliation(s)
- Natalia V Leiva
- Programa Magister en Ecología de Sistemas Acuáticos, Universidad de Antofagasta, Av. Angamos 601, P.O. Box 170, Antofagasta, Chile; Instituto de Ciencias Naturales "Alexander von Humboldt", Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Av. Angamos 601, P.O. Box 170, Antofagasta, Chile.
| | - Patricio H Manríquez
- Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile; Laboratorio de Ecología y Conducta de la Ontogenia Temprana (LECOT), Coquimbo, Chile
| | - Victor M Aguilera
- Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile; Facultad de Ciencias del Mar, Departamento de Biología Marina, Universidad Católica del Norte, Coquimbo, Chile; Instituto Milenio de Oceanografía and Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, P.O. Box 160 C, Concepción, Chile
| | - M Teresa González
- Instituto de Ciencias Naturales "Alexander von Humboldt", Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Av. Angamos 601, P.O. Box 170, Antofagasta, Chile
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25
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Leary E, Limburg B, Alanazy A, Sangtarash S, Grace I, Swada K, Esdaile LJ, Noori M, González MT, Rubio-Bollinger G, Sadeghi H, Hodgson A, Agraı̈t N, Higgins SJ, Lambert CJ, Anderson HL, Nichols RJ. Bias-Driven Conductance Increase with Length in Porphyrin Tapes. J Am Chem Soc 2018; 140:12877-12883. [DOI: 10.1021/jacs.8b06338] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Edmund Leary
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
| | - Bart Limburg
- Department of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, United Kingdom
| | - Asma Alanazy
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
- Department of Mathematics and Statistics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Sara Sangtarash
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Iain Grace
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Katsutoshi Swada
- Department of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, United Kingdom
| | - Louisa J. Esdaile
- Department of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, United Kingdom
| | - Mohammed Noori
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
- Physics Department, College of Science, University of Thi Qar, Thi Qar 0964, Iraq
| | - M. Teresa González
- Instituto Madrileño de Estudios Avanzados (IMDEA), Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Gabino Rubio-Bollinger
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto “Nicolás Cabrera”, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Hatef Sadeghi
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Andrew Hodgson
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
| | - Nicolás Agraı̈t
- Instituto Madrileño de Estudios Avanzados (IMDEA), Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
- Departamento de Física de la Materia Condensada, IFIMAC and Instituto “Nicolás Cabrera”, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Simon J. Higgins
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
| | - Colin J. Lambert
- Department of Physics, Lancaster University, Lancaster LA1 4YW, United Kingdom
| | - Harry L. Anderson
- Department of Chemistry, Chemistry Research Laboratory, Oxford University, Oxford OX1 3TA, United Kingdom
| | - Richard J. Nichols
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, United Kingdom
- Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom
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26
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Leary E, Roche C, Jiang HW, Grace I, González MT, Rubio-Bollinger G, Romero-Muñiz C, Xiong Y, Al-Galiby Q, Noori M, Lebedeva MA, Porfyrakis K, Agrait N, Hodgson A, Higgins SJ, Lambert CJ, Anderson HL, Nichols RJ. Detecting Mechanochemical Atropisomerization within an STM Break Junction. J Am Chem Soc 2018; 140:710-718. [DOI: 10.1021/jacs.7b10542] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Edmund Leary
- Department
of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, U.K
- Surface Science
Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, U.K
| | - Cécile Roche
- Chemistry
Research Laboratory, Department of Chemistry, Oxford University, Oxford OX1 3TA, U.K
| | - Hua-Wei Jiang
- Chemistry
Research Laboratory, Department of Chemistry, Oxford University, Oxford OX1 3TA, U.K
| | - Iain Grace
- Department
of Physics, Lancaster University, Lancaster, U.K
| | - M. Teresa González
- Instituto Madrileño de Estudios Advanzados (IMDEA), Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | | | | | - Yaoyao Xiong
- Chemistry
Research Laboratory, Department of Chemistry, Oxford University, Oxford OX1 3TA, U.K
| | - Qusiy Al-Galiby
- Department
of Physics, Lancaster University, Lancaster, U.K
- Department
of Physics, College of Education, University of Al-Qadisiyah, 58002 Iraq
| | - Mohammed Noori
- Department
of Physics, Lancaster University, Lancaster, U.K
- Department
of Physics, Collage of Science, Thi-Qar University, Thi-Qar 00964, Iraq
| | | | | | - Nicolás Agrait
- Instituto Madrileño de Estudios Advanzados (IMDEA), Calle Faraday 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
| | - Andrew Hodgson
- Department
of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, U.K
- Surface Science
Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, U.K
| | - Simon J. Higgins
- Department
of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, U.K
| | | | - Harry L. Anderson
- Chemistry
Research Laboratory, Department of Chemistry, Oxford University, Oxford OX1 3TA, U.K
| | - Richard J. Nichols
- Department
of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Liverpool L69 7ZD, U.K
- Surface Science
Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, U.K
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27
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Sepúlveda FA, Torres JF, Infante CD, González MT. Potential role of ectoparasites (Zeuxapta seriolae and Caligus lalandei) in the transmission of pathogenic bacteria in yellowtail kingfish Seriola lalandi, inferred from cultivable microbiota and molecular analyses. J Fish Dis 2017; 40:979-985. [PMID: 27943365 DOI: 10.1111/jfd.12582] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 10/11/2016] [Accepted: 10/13/2016] [Indexed: 06/06/2023]
Affiliation(s)
- F A Sepúlveda
- Laboratorio de Ecología Parasitaria y Epidemiología Marina LEPyEM, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
| | - J F Torres
- Laboratorio de Ecología Microbiana, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
| | - C D Infante
- Laboratorio de Ecología Microbiana, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
- Centro de Bioinnovación, Instituto Antofagasta, Universidad de Antofagasta, Antofagasta, Chile
| | - M T González
- Laboratorio de Ecología Parasitaria y Epidemiología Marina LEPyEM, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
- Instituto de Ciencias Naturales 'Alexander von Humboldt', Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
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28
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Márquez IR, Fuentes N, Cruz CM, Puente-Muñoz V, Sotorrios L, Marcos ML, Choquesillo-Lazarte D, Biel B, Crovetto L, Gómez-Bengoa E, González MT, Martin R, Cuerva JM, Campaña AG. Versatile synthesis and enlargement of functionalized distorted heptagon-containing nanographenes. Chem Sci 2017; 8:1068-1074. [PMID: 28451246 PMCID: PMC5357993 DOI: 10.1039/c6sc02895k] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 08/30/2016] [Indexed: 12/02/2022] Open
Abstract
Highly distorted polycyclic aromatic hydrocarbons (PAHs) are predicted to be attractive goals in nanoscience owing to the new properties they can exhibit. We have shown that a variety of functionalized distorted heptagon-containing nanographenes can be easily prepared from simple building blocks by a sequence of Co-catalyzed cyclotrimerization and cyclodehydrogenation reactions. The versatility of this strategy allows easy subsequent enlargement of these nanostructures by Ni-catalyzed cross-coupling and final cyclodehydrogenation reactions. Soluble extended distorted nanographenes 1 and 2 containing heptagon and an edge-shared pentagon-heptagon combination have been synthesized. High distortion of the polycyclic backbone of 2 caused by non-hexagonal rings and a helicene moiety was confirmed by X-ray crystallography. Experimental data reveal promising optical and electronic properties for distorted PAHs with long fluorescence lifetimes (up to 14.5 ns) and low band gaps (down to 2.27 eV). This straightforward and versatile synthetic strategy, the observed long fluorescence lifetimes and the small optical and electrochemical band gaps for the presented compounds may promote the future implementation of distorted graphene molecules in electronic devices.
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Affiliation(s)
- Irene R Márquez
- Departamento Química Orgánica , Universidad de Granada (UGR) , C. U. Fuentenueva , 18071 Granada , Spain .
| | - Noelia Fuentes
- Departamento Química Orgánica , Universidad de Granada (UGR) , C. U. Fuentenueva , 18071 Granada , Spain .
| | - Carlos M Cruz
- Departamento Química Orgánica , Universidad de Granada (UGR) , C. U. Fuentenueva , 18071 Granada , Spain .
| | - Virginia Puente-Muñoz
- Departamento de Fisicoquímica , Facultad de Farmacia , UGR. Cartuja Campus , 18071 Granada , Spain
| | - Lia Sotorrios
- Departamento de Química Orgánica I , Universidad del País Vasco , E-20018 , San Sebastián , Spain
| | - M Luisa Marcos
- Departamento de Química , Universidad Autónoma de Madrid , c/Francisco Tomás y Valiente no. 7, Cantoblanco , 28049 Madrid , Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos , Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR) , 18100 Armilla , Granada , Spain
| | - Blanca Biel
- Departamento de Electrónica y Tecnología de Computadores , Facultad de Ciencias , CITIC , UGR , E-18071 Granada , Spain
| | - Luis Crovetto
- Departamento de Fisicoquímica , Facultad de Farmacia , UGR. Cartuja Campus , 18071 Granada , Spain
| | - Enrique Gómez-Bengoa
- Departamento de Química Orgánica I , Universidad del País Vasco , E-20018 , San Sebastián , Spain
| | - M Teresa González
- Fundación IMDEA Nanociencia , Ciudad Universitaria de Cantoblanco , E-28049 Madrid , Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ) , Catalan Institution for Research and Advanced Studies (ICREA) , Spain
| | - Juan M Cuerva
- Departamento Química Orgánica , Universidad de Granada (UGR) , C. U. Fuentenueva , 18071 Granada , Spain .
| | - Araceli G Campaña
- Departamento Química Orgánica , Universidad de Granada (UGR) , C. U. Fuentenueva , 18071 Granada , Spain .
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Sepúlveda FA, González MT. Spatio-temporal patterns of genetic variations in populations of yellowtail kingfish Seriola lalandi from the south-eastern Pacific Ocean and potential implications for its fishery management. J Fish Biol 2017; 90:249-264. [PMID: 27781264 DOI: 10.1111/jfb.13179] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 09/07/2016] [Indexed: 06/06/2023]
Abstract
The genetic population structure and genetic diversity of yellowtail kingfish Seriola lalandi from the coastal south-eastern Pacific Ocean (SEP) were evaluated at spatiotemporal scale in order to understand the ecology of this species. Between 2012 and 2015, temporal and spatial population genetic structure and a low genetic diversity were detected in S. lalandi from SEP. These results suggest that S. lalandi specimens arriving annually from offshore to the SEP coast could come from at least two genetically distinct populations, revealing a particular life strategy (i.e. reproductive or habitat segregation) for this fish species. Therefore, the SEP coast might constitute a point of population mixing for this species. Additionally, the low genetic diversity of S. lalandi in the SEP could be a result of a founder effect or overfishing. Regardless of the process explaining the genetic diversity and structure of S. lalandi in this geographical area, this new information should be considered in order to implement successful fishery management of this resource in the South Pacific.
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Affiliation(s)
- F A Sepúlveda
- Laboratorio de Ecología Parasitaria y Epidemiología Marina LEPyEM, Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, P. O. Box 170, Antofagasta, 1240000, Chile
| | - M T González
- Laboratorio de Ecología Parasitaria y Epidemiología Marina LEPyEM, Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, P. O. Box 170, Antofagasta, 1240000, Chile
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González MT, Castro R, Muñoz G, López Z. Sea lice (Siphonostomatoida: Caligidae) diversity on littoral fishes from the south-eastern Pacific coast determined from morphology and molecular analysis, with description of a new species (Lepeophtheirus confusum). Parasitol Int 2016; 65:685-695. [PMID: 27580816 DOI: 10.1016/j.parint.2016.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 07/18/2016] [Accepted: 08/26/2016] [Indexed: 11/17/2022]
Abstract
Parasitic copepods of the family Caligidae are common on marine fish worldwide, and some species are responsible for disease outbreaks in aquaculture. Ten species of Lepeophtheirus have thus far been described in the south-eastern Pacific coast. Seven species have been recorded from littoral fish species. However, the latitudinal distribution and host ranges of these Lepeophtheirus spp. are not known. We evaluated, using morphology and molecular analyses, the taxonomic diversity, geographical distributions and host range of known Lepeophtheirus species. Seventeen fish species were examined for copepods. The collected parasites were identified according to their morphology and genetic sequences, based on rDNA 28S and COI genes. The recognition of Lepeophtheirus chilensis and L. mugiloides was indeed difficult due to the high morphological similarities between them. However, their taxonomic statuses were supported by the COI gene and ABGD analysis, with 6% of genetic distance. Moreover, a new species with a genetic distance of 19-22% with respect to known species was detected and described herein as L. confusum. This new species can be distinguished from other Lepeophtheirus spp. by a combination of characters (maxillary tine length and width; furca shape; the fifth leg position, shape and armature; maxillule tine length and thickness; and maxilliped armature on the myxal area). Lepeophtheirus chilensis, L. mugiloides and L. frecuens co-occurred on several littoral fish species, showing an extensive latitudinal distribution, whereas L. confusum was found only on Eleginops maclovinus from southern latitudes.
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Affiliation(s)
- M Teresa González
- Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile.
| | - Raúl Castro
- Depto. Ciencias Acuáticas y Ambientales, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
| | - Gabriela Muñoz
- Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, P.O. 5080, Viña del Mar, Chile
| | - Zambra López
- Instituto de Ciencias Naturales Alexander von Humboldt, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
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Miguel D, Álvarez de Cienfuegos L, Martín-Lasanta A, Morcillo SP, Zotti LA, Leary E, Bürkle M, Asai Y, Jurado R, Cárdenas DJ, Rubio-Bollinger G, Agraït N, Cuerva JM, González MT. Toward Multiple Conductance Pathways with Heterocycle-Based Oligo(phenyleneethynylene) Derivatives. J Am Chem Soc 2015; 137:13818-26. [DOI: 10.1021/jacs.5b05637] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Delia Miguel
- Departamento
de Química Orgánica, Universidad de Granada, C. U. Fuentenueva,
Avda. Severo Ochoa s/n, E-18071 Granada, Spain
| | - Luis Álvarez de Cienfuegos
- Departamento
de Química Orgánica, Universidad de Granada, C. U. Fuentenueva,
Avda. Severo Ochoa s/n, E-18071 Granada, Spain
| | - Ana Martín-Lasanta
- Fundación
IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Sara P. Morcillo
- Departamento
de Química Orgánica, Universidad de Granada, C. U. Fuentenueva,
Avda. Severo Ochoa s/n, E-18071 Granada, Spain
| | - Linda A. Zotti
- Departamento
of Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Edmund Leary
- Fundación
IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Marius Bürkle
- Nanomaterials
Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Yoshihiro Asai
- Nanomaterials
Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Rocío Jurado
- Departamento
de Química Orgánica, Universidad de Granada, C. U. Fuentenueva,
Avda. Severo Ochoa s/n, E-18071 Granada, Spain
| | - Diego J. Cárdenas
- Departamento
de Química Orgánica, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Gabino Rubio-Bollinger
- Departamento
de Física de la Materia Condensada and Condensed Matter Physics
Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Instituto
“Nicolás Cabrera”, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Nicolás Agraït
- Fundación
IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
- Departamento
de Física de la Materia Condensada and Condensed Matter Physics
Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Instituto
“Nicolás Cabrera”, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Juan M. Cuerva
- Departamento
de Química Orgánica, Universidad de Granada, C. U. Fuentenueva,
Avda. Severo Ochoa s/n, E-18071 Granada, Spain
| | - M. Teresa González
- Fundación
IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
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García R, Herranz MÁ, Leary E, González MT, Bollinger GR, Bürkle M, Zotti LA, Asai Y, Pauly F, Cuevas JC, Agraït N, Martín N. Single-molecule conductance of a chemically modified, π-extended tetrathiafulvalene and its charge-transfer complex with F4TCNQ. Beilstein J Org Chem 2015. [PMID: 26199662 PMCID: PMC4505095 DOI: 10.3762/bjoc.11.120] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We describe the synthesis and single-molecule electrical transport properties of a molecular wire containing a π-extended tetrathiafulvalene (exTTF) group and its charge-transfer complex with F4TCNQ. We form single-molecule junctions using the in situ break junction technique using a homebuilt scanning tunneling microscope with a range of conductance between 10 G0 down to 10(-7) G0. Within this range we do not observe a clear conductance signature of the neutral parent molecule, suggesting either that its conductance is too low or that it does not form a stable junction. Conversely, we do find a clear conductance signature in the experiments carried out on the charge-transfer complex. Due to the fact we expected this species to have a higher conductance than the neutral molecule, we believe this supports the idea that the conductance of the neutral molecule is very low, below our measurement sensitivity. This idea is further supported by theoretical calculations. To the best of our knowledge, these are the first reported single-molecule conductance measurements on a molecular charge-transfer species.
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Affiliation(s)
- Raúl García
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain
| | - M Ángeles Herranz
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain
| | - Edmund Leary
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
| | - M Teresa González
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
| | - Gabino Rubio Bollinger
- Departamento de Física de la Materia Condensada, and Instituto "Nicolás Cabrera", Universidad Autonoma de Madrid, E-28049 Madrid, Spain
| | - Marius Bürkle
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Linda A Zotti
- Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
| | - Yoshihiro Asai
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - Fabian Pauly
- Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
| | - Juan Carlos Cuevas
- Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
| | - Nicolás Agraït
- Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain ; Departamento de Física de la Materia Condensada, and Instituto "Nicolás Cabrera", Universidad Autonoma de Madrid, E-28049 Madrid, Spain
| | - Nazario Martín
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain ; Fundación IMDEA Nanoscience, Campus de Cantoblanco, Universidad Autónoma, E-28048 Madrid, Spain
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Gairí M, Dyachenko A, González MT, Feliz M, Pons M, Giralt E. An optimized method for (15)N R(1) relaxation rate measurements in non-deuterated proteins. J Biomol NMR 2015; 62:209-20. [PMID: 25947359 PMCID: PMC4451471 DOI: 10.1007/s10858-015-9937-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 04/27/2015] [Indexed: 05/20/2023]
Abstract
(15)N longitudinal relaxation rates are extensively used for the characterization of protein dynamics; however, their accurate measurement is hindered by systematic errors. (15)N CSA/(1)H-(15)N dipolar cross-correlated relaxation (CC) and amide proton exchange saturation transfer from water protons are the two main sources of systematic errors in the determination of (15)N R1 rates through (1)H-(15)N HSQC-based experiments. CC is usually suppressed through a train of 180° proton pulses applied during the variable (15)N relaxation period (T), which can perturb water magnetization. Thus CC cancellation is required in such a way as to minimize water saturation effects. Here we examined the level of water saturation during the T period caused by various types of inversion proton pulses to suppress CC: (I) amide-selective IBURP-2; (II) cosine-modulated IBURP-2; (III) Watergate-like blocks; and (IV) non-selective hard. We additionally demonstrate the effect of uncontrolled saturation of aliphatic protons on (15)N R1 rates. In this paper we present an optimized pulse sequence that takes into account the crucial effect of controlling also the saturation of the aliphatic protons during (15)N R1 measurements in non-deuterated proteins. We show that using cosine-modulated IBURP-2 pulses spaced 40 ms to cancel CC in this optimized pulse program is the method of choice to minimize systematic errors coming from water and aliphatic protons saturation effects.
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Affiliation(s)
- Margarida Gairí
- />NMR Facility, Scientific and Technological Centers, University of Barcelona (CCiTUB), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Andrey Dyachenko
- />Institute for Research in Biomedicine (IRB), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - M. Teresa González
- />NMR Facility, Scientific and Technological Centers, University of Barcelona (CCiTUB), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Miguel Feliz
- />NMR Facility, Scientific and Technological Centers, University of Barcelona (CCiTUB), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Miquel Pons
- />Biomolecular NMR Laboratory and Organic Chemistry Department, University of Barcelona, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Ernest Giralt
- />Institute for Research in Biomedicine (IRB), Baldiri Reixac 10, 08028 Barcelona, Spain
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Sepúlveda FA, González MT. Patterns of genetic variation and life history traits of Zeuxapta seriolae infesting Seriola lalandi across the coastal and oceanic areas in the southeastern Pacific Ocean: potential implications for aquaculture. Parasit Vectors 2015; 8:282. [PMID: 25994495 PMCID: PMC4489213 DOI: 10.1186/s13071-015-0892-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Accepted: 05/08/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The monogenean, Zeuxapta seriolae, is a host-specific parasite that has an extensive geographical distribution on its host, Seriola lalandi, and is considered highly pathogenic in farmed fish. In recent years, developing cultures of S. lalandi in different coastal localities in Southeastern Pacific Ocean (SEP) have been affected by moderate and heavy infections of this parasite, attributed to contagion from wild to farmed fish. Here, we evaluated the pattern of genetic variations and biological traits of Z. seriolae in a spatial and temporal scale across its geographical distribution in SEP to determine its genetic status and biological traits, which could affect its transmission dynamics from wild to farmed fish. METHODS Wild fish and their parasites were sampled from fisheries in the northern Chilean coast (NCC: 24°S-30°S) and Eastern islands (JFA: ca 33°S; 80°W) between 2012 and 2014. Fragments of 816 bp of the cytochrome c oxidase subunit I (COI) gene was sequenced for 112 individuals from NCC and 63 from JFA and compared using AMOVA. Prevalence and intensity of Z. seriolae were calculated for each area. The parasite body size, fecundity and size at sexual maturity were estimated for 177 parasites from NCC and 128 from JFA, and significant differences were evaluated using GLM. RESULTS Geographical genetic structuring was detected for Z. seriolae across SEP, with a population in NCC and the other in JFA, both with the same high haplotype diversity. Neutrality tests and mismatch analyses indicated that both Z. seriolae populations are stable. Parasite biological traits such as fecundity, body size, and size at sexual maturity, and population parameters varied significantly between geographical areas. CONCLUSION Two genetic groups of Z. seriolae were detected in wild fish across SEP. Because of the seasonal migration of wild host and temporal contact with farming, quantifying the genetic diversity and level of gene flow or isolation between parasite populations is useful for fish health management in farming. The smallest size of sexual maturity in parasites from NCC is predictive of shorter life cycles, and their high genetic diversity suggests high evolutionary potential and high transmission of this parasite to farmed hosts.
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Affiliation(s)
- Fabiola A Sepúlveda
- Programa Ciencias Aplicadas, mención Sistemas Marinos Costeros, Universidad de Antofagasta, P.O. Box 170, Antofagasta, 1240000, Chile.
| | - M Teresa González
- Instituto de Ciencias Naturales "Alexander von Humboldt", Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, 1240000, Chile.
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López Z, Cárdenas L, Runil F, González MT. Contrasting definitive hosts as determinants of the genetic structure in a parasite with complex life cycle along the south-eastern Pacific. Mol Ecol 2015; 24:1060-73. [PMID: 25602037 DOI: 10.1111/mec.13080] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 01/08/2015] [Accepted: 01/14/2015] [Indexed: 11/28/2022]
Abstract
The spatial genetic structure (and gene flow) of parasites with complex life cycles, such as digeneans, has been attributed mainly to the dispersion ability of the most mobile host, which most often corresponds to the definitive host (DH). In this study, we compared the genetic structure and diversity of adult Neolebouria georgenascimentoi in two fish species (DHs) that are extensively distributed along the south-eastern Pacific (SEP). The analysis was based on the cytochrome oxidase subunit I gene sequences of parasites collected between 23°S and 45°S. In total, 202 sequences of N. georgenascimentoi in Pinguipes chilensis isolated from nine sites and 136 sequences of Prolatilus jugularis from five sites were analysed. Our results showed that N. georgenascimentoi is a species complex that includes three different parasite species; however, in this study, only lineage 1 and 2 found in P. chilensis and P. jugularis, respectively, were studied because they are widely distributed along the coastline. Lineage 1 parasites had two common haplotypes with wide distribution and unique haplotypes in northern sites. Lineage 2 had only one common haplotype with wide distribution and a large number of unique haplotypes with greater genetic diversity. Both lineages have experienced recent population expansion. Only lineage 1 exhibited a genetic structure that was mainly associated with a biogeographical break at approximately 30°S along the SEP. Our finding suggests that host access to different prey (=intermediate hosts) could affect the genetic structure of the parasite complex discovered here. Consequently, difference between these patterns suggests that factors other than DH dispersal are involved in the genetic structure of autogenic parasites.
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Affiliation(s)
- Z López
- Instituto de Ciencias Naturales "Alexander Von Humboldt", Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Av. Angamos 601, P.O. Box 170, Antofagasta, Chile; Programa Magíster en Ecología de Sistemas Acuáticos, Universidad de Antofagasta, Antofagasta, Chile
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Leary E, La Rosa A, González MT, Rubio-Bollinger G, Agraït N, Martín N. Incorporating single molecules into electrical circuits. The role of the chemical anchoring group. Chem Soc Rev 2015; 44:920-42. [DOI: 10.1039/c4cs00264d] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Constructing electronic circuits containing singly wired molecules is at the frontier of electrical device miniaturisation. Understanding the behaviour of different anchoring groups is key to this goal because of their significant role in determining the properties of the junction.
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Affiliation(s)
- Edmund Leary
- IMDEA Nanociencia
- C/Faraday 9
- 28049 Madrid
- Spain
- Depto. Física de la Materia Condensada Mod. 3-610 – Universidad Autónoma de Madrid
| | - Andrea La Rosa
- Departamento de Química Orgánica
- Facultad de Ciencias Quıímicas
- Universidad Complutense de Madrid
- Madrid
- Spain
| | | | - Gabino Rubio-Bollinger
- Depto. Física de la Materia Condensada Mod. 3-610 – Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Nicolás Agraït
- IMDEA Nanociencia
- C/Faraday 9
- 28049 Madrid
- Spain
- Depto. Física de la Materia Condensada Mod. 3-610 – Universidad Autónoma de Madrid
| | - Nazario Martín
- IMDEA Nanociencia
- C/Faraday 9
- 28049 Madrid
- Spain
- Departamento de Química Orgánica
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Oliva ME, Sepulveda FA, González MT. Parapedocotyle prolatili gen. n. et sp. n., a representative of a new subfamily of the Diclidophoridae (Monogenea), a gill parasite of Prolatilus jugularis (Teleostei: Pinguipedidae) from Chile. Folia Parasitol (Praha) 2014; 61:543-548. [PMID: 25651696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Parapedocotylinae, a new subfamily, is proposed to accommodate the gen. n. et sp. n. Parapedocotyle prolatili (Monogenea: Diclidophoridae), a gill parasite of the Pacific sandperch, Prolatilus jugularis (Valenciennes) (Pinguipedidae) from northern Chile (30 degrees 56'S; 71 degrees 20'W). Among the Diclidophoridae Cerfontaine, 1895, the species of the Pedocotylinae Yamaguti, 1963 are unique by bearing the first pair of clamps (most posteriorly) in a haptoral projection. Pedocotyle MacCallum, 1913, the only genus in the Pedocotylinae, is characterised by the first pair of clamps non-pedunculate, modified and non-functional, without accessory suckers, and clamps of pairs 2-4 being pedunculate and functional. In contrast, the first pair of clamps in Parapedocotyle is well developed and functional at the terminal end of a long haptoral appendix and having clamp pairs 2-4 pedunculated, modified and apparently not functional. Seminal receptacle is preovarian in Parapedocotyle in opposition to its postovarian position in Pedocotyle. These differences justified the erection of the new subfamily Parapedocotylinae. The new subfamily is also supported by genetic analyses (18S rDNA, 28S rDNA and cox1 sequences) demonstrating that the Pedocotylinae and Parapedocotylinae belong to different clades in the Diclidophoridae.
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Torregrosa JV, González-Parra E, González MT, Cannata-Andía J. REFOS study: efficacy and safety of lanthanum carbonate in clinical practice in Spain. Nefrologia 2014; 34:360-368. [PMID: 24849057 DOI: 10.3265/nefrologia.pre2014.mar.12287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2014] [Indexed: 06/03/2023] Open
Abstract
Lanthanum carbonate is a powerful phosphate binder that has shown efficacy and safety in clinical trials for hyperphosphataemia management, although there are few data in regular clinical practice. The study's objective was to evaluate, in regular clinical practice, its efficacy and safety in patients on dialysis. We retrospectively collected data from 15 months of monitoring, corresponding to 3 months prior to the start of treatment with lanthanum carbonate until 12 months after the start. Results included values of serum calcium, phosphorus, alkaline phosphatase, iPTH, hepatic enzymes and haemogram, as well as the daily-prescribed dose of lanthanum carbonate, the concomitant medication, treatment compliance and adverse events. 647 patients were included of which 522 completed the study. Abandonment, for the most part, was due to gastrointestinal disorders (26%) and hypophosphatemia (19%). Serum phosphorus decreased from 6.4±1.7 mg/dl (start) to 4.9±1.4 mg/dl (12 months) (P<.001). At the end of the monitoring period, 47% were within the desired phosphorus range (3.5-5mg/dl). There were no significant variations in the remaining parameters. Initial dose of lanthanum carbonate: 1900 mg/day; and end dose: 2300 mg/day. The variables independently associated with phosphataemia were baseline serum phosphorus and treatment compliance. In relation to safety, we observed 238 slight or moderate adverse effects in 117 patients, with 88% linked to gastrointestinal abnormalities. In conclusion, lanthanum carbonate reduces the serum phosphorus values in patients on dialysis with a good safety profile and acceptable adherence to that profile, with gastrointestinal disorders being the most frequent adverse effect.
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Gillemot K, Evangeli C, Leary E, La Rosa A, González MT, Filippone S, Grace I, Rubio-Bollinger G, Ferrer J, Martín N, Lambert CJ, Agraït N. A detailed experimental and theoretical study into the properties of C60 dumbbell junctions. Small 2013; 9:3812-3822. [PMID: 23630169 DOI: 10.1002/smll.201300310] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 03/04/2013] [Indexed: 06/02/2023]
Abstract
A combined experimental and theoretical investigation is carried out into the electrical transport across a fullerene dumbbell one-molecule junction. The newly designed molecule comprises two C60 s connected to a fluorene backbone via cyclopropyl groups. It is wired between gold electrodes under ambient conditions by pressing the tip of a scanning tunnelling microscope (STM) onto one of the C60 groups. The STM allows us to identify a single molecule before the junction is formed through imaging, which means unambiguously that only one molecule is wired. Once lifted, the same molecule could be wired many times as it was strongly fixed to the tip, and a high conductance state close to 10(-2) G0 is found. The results also suggest that the relative conductance fluctuations are low as a result of the low mobility of the molecule. Theoretical analysis indicates that the molecule is connected directly to one electrode through the central fluorene, and that to bind it to the gold fully it has to be pushed through a layer of adsorbates naturally present in the experiment.
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Affiliation(s)
- Katalin Gillemot
- Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK
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Evangeli C, Gillemot K, Leary E, González MT, Rubio-Bollinger G, Lambert CJ, Agraït N. Engineering the thermopower of C60 molecular junctions. Nano Lett 2013; 13:2141-5. [PMID: 23544957 DOI: 10.1021/nl400579g] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We report the measurement of conductance and thermopower of C60 molecular junctions using a scanning tunneling microscope (STM). In contrast to previous measurements, we use the imaging capability of the STM to determine precisely the number of molecules in the junction and measure thermopower and conductance continuously and simultaneously during formation and breaking of the molecular junction, achieving a complete characterization at the single-molecule level. We find that the thermopower of C60 dimers formed by trapping a C60 on the tip and contacting an isolated C60 almost doubles with respect to that of a single C60 and is among the highest values measured to date for organic materials. Density functional theory calculations show that the thermopower and the figure of merit continue increasing with the number of C60 molecules, demonstrating the enhancement of thermoelectric preformance by manipulation of intermolecular interactions.
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Affiliation(s)
- Charalambos Evangeli
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain
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González MT, Díaz A, Leary E, García R, Herranz MÁ, Rubio-Bollinger G, Martín N, Agraït N. Stability of Single- and Few-Molecule Junctions of Conjugated Diamines. J Am Chem Soc 2013; 135:5420-6. [DOI: 10.1021/ja312392q] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Teresa González
- Instituto Madrileño de
Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid,
Spain
| | | | - Edmund Leary
- Instituto Madrileño de
Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid,
Spain
| | - Raúl García
- Departamento de Química
Orgánica, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - M. Ángeles Herranz
- Departamento de Química
Orgánica, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | | | - Nazario Martín
- Instituto Madrileño de
Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid,
Spain
- Departamento de Química
Orgánica, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Nicolás Agraït
- Instituto Madrileño de
Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid,
Spain
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González MT, Ramos R, Vera M, Barbosa F, Garcia C, Garcia I, González-Segura C, Cuxart M, Teixidó J, José de la Cruz J. Monthly CERA treatment maintains stable hemoglobin levels in routine clinical practice of peritoneal dialysis patients. Ren Fail 2013; 35:314-9. [PMID: 23356501 DOI: 10.3109/0886022x.2012.755903] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Data on routine use of continuous erythropoietin receptor activator (CERA) in peritoneal dialysis patients are scarce. This study aimed to assess the efficacy of CERA administered once monthly in maintaining stable Hb levels in patients on peritoneal dialysis under routine medical practice. This was a 12-month, observational, prospective and multicenter study. A total of 83 patients with anemia secondary to chronic kidney disease (CKD) on peritoneal dialysis for more than 3 months, on once-monthly subcutaneous CERA treatment, were followed up over a period of 1 year. Efficacy evaluation included Hb levels, mean time in which the Hb level was maintained within target range, CERA doses and number of dose changes. Median Hb level (interquartile range [IQR]) remained stable during the evaluation period [11.8 ± 1.4 g/dL at baseline, 11.8 ± 1.4 g/dL at month 6 and 11.8 ± 1.5 g/dL at month 12 (p > 0.05)]. The median (IQR) time of Hb level maintained within target range (11-13 mg/dL) was 6 (4-10) months. Ferritin, transferrin saturation index, and Fe were also stable and well maintained during the 12 months (p > 0.05). CERA mean dose (SD) was [115.4 (56.2) μg baseline; 117.2 (58.5) μg 6 months; 126.0 (65.9) μg 12 months (p = 0.127)]. The mean number of CERA dose changes per patient during the study was 1.6 (SD 1.3). Serious adverse events were not related to CERA treatment. The results suggest that once-monthly CERA successfully corrects anemia and maintains stable Hb levels within the recommended target range on peritoneal dialysis under routine medical practice.
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Affiliation(s)
- M Teresa González
- Nephrology Department, L´Hospitalet de LLobregat, H. Universitari Bellvitge, Barcelona, Spain.
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Arroyo CR, Leary E, Castellanos-Gómez A, Rubio-Bollinger G, González MT, Agraït N. Influence of Binding Groups on Molecular Junction Formation. J Am Chem Soc 2011; 133:14313-9. [DOI: 10.1021/ja201861k] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
| | - Edmund Leary
- Instituto Madrileño de Estudios Advanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | | | | | - M. Teresa González
- Instituto Madrileño de Estudios Advanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
| | - Nicolás Agraït
- Instituto Madrileño de Estudios Advanzados en Nanociencia (IMDEA-Nanociencia), Ciudad Universitaria de Cantoblanco, E-28049 Madrid, Spain
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Leary E, González MT, van der Pol C, Bryce MR, Filippone S, Martín N, Rubio-Bollinger G, Agraït N. Unambiguous one-molecule conductance measurements under ambient conditions. Nano Lett 2011; 11:2236-2241. [PMID: 21548597 DOI: 10.1021/nl200294s] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
One of the challenging goals of molecular electronics is to wire exactly one molecule between two electrodes. This is generally nontrivial under ambient conditions. We describe a new and straightforward protocol for unambiguously isolating a single organic molecule on a metal surface and wiring it inside a nanojunction under ambient conditions. Our strategy employs C(60) terminal groups which act as molecular beacons allowing molecules to be visualized and individually targeted on a gold surface using an scanning tunneling microscope. After isolating one molecule, we then use the C(60) groups as alligator clips to wire it between the tip and surface. Once wired, we can monitor how the conductance of a purely one molecule junction evolves with time, stretch the molecule in the junction, observing characteristic current plateaus upon elongation, and also perform direct I-V spectroscopy. By characterizing and controlling the junction, we can draw stronger conclusions about the observed variation in molecular conductance than was previously possible.
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Affiliation(s)
- Edmund Leary
- Instituto Madrileño de Estudios Avanzados, Facultad de Ciencias Módulo 9, 3a planta Avda. Fco. Tomás y Valiente, 7 Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
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Martos AI, Romero A, González MT, González A, Serrano C, Castro C, Pemán J, Cantón E, Martín-Mazuelos E. Evaluation of the Etest method for susceptibility testing of Aspergillus spp. and Fusarium spp. to three echinocandins. Med Mycol 2010; 48:858-61. [PMID: 20144131 DOI: 10.3109/13693781003586943] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We performed Etest and broth microdilution (BMD) susceptibility testing of caspofungin, micafungin and anidulafungin against 67 clinical isolates of Aspergillus spp. and 10 Fusarium spp. Minimal effective concentrations (MECs) by BMD were read after 24 h of incubation at 35 degrees C and Etest MICs were read at 24 and 48 h. MECs < or =0.25 mg/l were obtained with caspofungin for all Aspergillus spp. tested but Etest MICs were < or =1 mg/l at 24 h. The agreement between caspofungin Etest and broth microdilution was good for all Aspergillus species tested (range 82.4-100%) except for A. niger and A. glaucus at 24 h of incubation. Micafungin and anidulafungin MEC and MIC results were lower than those of caspofungin (< or =0.015 mg/l) at 24 and 48 h for all Aspergillus tested. The agreement between the methods was excellent (100%) for micafungin and anidulafungin for all Aspergillus species tested. The three echinocandins were inactive against all isolates of Fusarium spp. showing MECs and MICs >8 mg/l. The Etest method could be a suitable procedure to test the susceptibility of most Aspergillus species to caspofungin, micafungin and anidulafungin; the best agreement was at 24 h.
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Affiliation(s)
- A I Martos
- Microbiology Service, University Hospital of Valme, Seville-Cádiz Road, Seville, Spain.
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Aller AI, Castro C, Medina MJ, González MT, Sevilla P, Morilla MD, Corzo JE, Martín-Mazuelos E. Isolation of Moellerella wisconsensis from blood culture from a patient with acute cholecystitis. Clin Microbiol Infect 2009; 15:1193-4. [PMID: 19732083 DOI: 10.1111/j.1469-0691.2009.03046.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Oliva ME, González MT, Ruz PM, Luque JL. Two new species of Choricotyle Van Beneden & Hesse (Monogenea: Diclidophoridae), parasites from Anisotremus scapularis and Isacia conceptionis (Haemulidae) from northern Chilean coast. J Parasitol 2009; 95:1108-11. [PMID: 19413363 DOI: 10.1645/ge-2038.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Accepted: 04/29/2009] [Indexed: 11/10/2022] Open
Abstract
Two new species, Choricotyle scapularis and Choricotyle isaciencis (Monogenea: Diclidophoridae), are described from the gills of haemulid fishes, Anisotremus scapularis and Isacia conceptionis, respectively, in San Jorge Bay, northern Chile (23 degrees 42'S, 70 degrees 24'W); they are compared with the known species in the genus. Diagnostic characters for C. scapularis includes the number of hooks in the male copulatory organ, a developed isthmus, the shape of the haptor, and the number of testes. The diagnostic characters for C. isaciensis include the presence of an oval accesory sclerite in the clamps, the number of testes, the number of hooks in the male copulatory organ, and the relative clamp peduncle size.
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Affiliation(s)
- M E Oliva
- Instituto de Investigaciones Oceanológicas, Facultad de Recursos del Mar, Universidad de Antofagasta, Casilla 170-Antofagasta, Chile.
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González MT, Vásquez R, Acuña E. Biogeographic patterns of metazoan parasites of the bigeye flounder, Hippoglossina macrops, in the southeastern Pacific coast. J Parasitol 2008; 94:429-35. [PMID: 18564744 DOI: 10.1645/ge-1265.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
We examined the metazoan parasite fauna of the bigeye flounder, Hippoglossina macrops, in a latitudinal gradient of the southeastern Pacific (ca. 25 degrees S-33 degrees S) to assess whether their parasites show latitudinal and/or biogeographical patterns, and to determine if these patterns agree well with those observed for free-living organisms. In total, 331 fish from 6 localities were analyzed. Eighteen parasite species, including 5 ecto- and 13 endoparasites, were found in the bigeye flounder. Neoheterobothrium chilensis, Floridosentis sp., and Corynosoma australe were the most prevalent parasite species. Ecto- and endoparasites of H. macrops showed different latitudinal patterns. Only endoparasite species show a distributional pattern concordant with biogeographic areas recognized for free-living organisms; this finding was supported by cluster analyses showing 2 major divisions. The first joined the most northern localities (25 degrees S-26 degrees S), and the second consisted of 2 subgroups: (1) 28 degrees S-30 degrees S, and (2) 31 degrees S-32 degrees S. A multivariate analysis of infracommunities showed significant differences in the parasitic load of H. macrops from different latitudes. The latitudinal differences in the prevalence and abundance of the parasites might be explained by differing oceanographic conditions in water masses. These physical conditions could affect the dispersal ability of the infective stages of ecto-parasites, and produce zoogeographical breaks that could affect the distribution of intermediate hosts (invertebrate and vertebrate prey), subsequently affecting the transmission of endoparasites.
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Affiliation(s)
- M T González
- Instituto de Investigaciones Oceanológicas, Universidad de Antofagasta, Casilla 170 - Antofagasta, Chile.
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Ramos R, Moreso F, Borras M, Ponz E, Buades JM, Teixidó J, Morey A, Garcia C, Vera M, Doñate MT, de Arellano MR, Barbosa F, González MT. Sevelamer hydrochloride in peritoneal dialysis patients: results of a multicenter cross-sectional study. Perit Dial Int 2007; 27:697-701. [PMID: 17984434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
BACKGROUND Sevelamer hydrochloride is a phosphate binder widely employed in hemodialysis patients. Until now, information about its efficacy and safety in peritoneal dialysis patients has been scarce. PATIENTS AND METHODS In September 2005 a cross-sectional study of demographic, biochemical, and therapeutic data of patients from 10 peritoneal dialysis units in Catalonia and the Balearic Islands, Spain, was conducted. RESULTS We analyzed data from 228 patients. At the time of the study, 128 patients (56%) were receiving sevelamer. Patients receiving sevelamer were younger (p < 0.01), showed a longer period of time on dialysis (p < 0.01), and had a lower Charlson Comorbidity Index (p < 0.01). Serum calcium and intact parathyroid hormone levels were not different between the two groups, while phosphate levels <5.5 mg/dL were observed more frequently in patients not receiving sevelamer (79% vs 61%, p < 0.01). Serum total cholesterol (167 +/- 41 vs 189 +/- 42 mg/dL, p < 0.01) and low density lipoprotein (LDL) cholesterol (90 +/- 34 vs 109 +/- 34 mg/dL, p < 0.01), but not high density lipoprotein cholesterol or triglycerides, were lower in sevelamer-treated patients. Moreover, sevelamer-treated patients displayed a higher serum albumin (38 +/- 5 vs 36 +/- 4 g/L, p < 0.01) and a lower C-reactive protein (4.9 +/- 12.8 vs 8.8 +/- 15.7 mg/L, p < 0.01). Blood bicarbonate levels <22 mmol/L were observed more frequently in patients receiving sevelamer (22% vs 5%, p < 0.01). Logistic regression analysis adjusting by confounding variables confirmed that sevelamer therapy was associated with serum total cholesterol <200 mg/dL [relative risk (RR): 2.77, 95% confidence interval (CI): 1.44 - 5.26, p = 0.002] and blood bicarbonate <22 mmol/L (RR: 8.5, 95% CI: 2.6 - 27.0, p < 0.001), but not with serum phosphate >5.5 mg/dL, calcium-phosphate product >55 mg(2)/dL(2), serum albumin <35 g/L, or C-reactive protein >5 mg/L. CONCLUSIONS This uncontrolled cross-sectional study in peritoneal dialysis patients showed that sevelamer hydrochloride treatment allows an adequate serum phosphate level in about 60% of patients and significantly reduces total and LDL-cholesterol levels. Since this treatment is associated with metabolic acidosis in 22% of patients, we recommend close monitoring of bicarbonate levels in this group of patients until the clinical significance of this result is clarified.
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Affiliation(s)
- Rosa Ramos
- Servei de Nefrologia, Hospital Universitari de Bellvitge, C/Feixa Llarga s/n, L'Hospitalet, Barcelona, Spain.
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Ramos R, González MT, Moreso F, Castelao AM, Grinyó JM. Chylous ascites: an unusual complication of percutaneous peritoneal catheter implantation. Perit Dial Int 2006; 26:722-3. [PMID: 17047246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023] Open
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