496 research outputs found

    Quantum theory of the Intrinsic Orbital Magnetoelectric Effect in itinerant electron systems at finite temperatures

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    Magnetization can be induced by an electric field in systems without inversion symmetry P\mathcal{P} and time-reversal symmetry T\mathcal{T}. This phenomenon is called the magnetoelectric (ME) effect. The spin ME effect has been actively studied in multiferroics. The orbital ME effect also exists and has been mainly discussed in topological insulators at zero temperature. In this paper, we study the intrinsic orbital ME response in metals at finite temperature using the Kubo formula. The intrinsic response originates from the Fermi sea and does not depend on the dissipation. Especially in systems with PT\mathcal{PT}-symmetry, the extrinsic orbital ME effect becomes zero, and the intrinsic ME effect is dominant. We apply the response tensor obtained in this work to a PT\mathcal{PT}-symmetric model Hamiltonian with antiferromagnetic loop current order demonstrating that the intrinsic ME effect is enhanced around the Dirac points

    The current state of DNA barcoding of macroalgae in the Mediterranean Sea : presently lacking but urgently required

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    The research work disclosed in this publication is partially funded by the ENDEAVOUR Scholarship Scheme (Malta)-Group B ā€“ National Funds. FCK would also like to thank the UK Natural Environment Research Council (grants NE/D521522/1, NE/J023094/1, 2025/WP 4.5), the TOTAL Foundation (Project ā€œDiversity of brown algae in the Eastern Mediterraneanā€) and the Marine Alliance for Science and Technology for Scotland (MASTS) pooling initiative, which is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. AFP was funded by the project IDEALG (France: ANR-10-BTBR-04).Peer reviewedPostprin

    The Mediterranean deep-water kelp Laminaria rodriguezii is an endangered species in the Adriatic Sea

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    Acknowledgments Thanks are due to Klaus LĆ¼ning for a gametophyte culture of L. abyssalis, and to Britta Schaffelke for a herbarium specimen of L. rodriguezii from the western Mediterranean. We are grateful to the Total Foundation (Paris) for funding this study within the framework of the project ā€œBrown algal ecology and biodiversity in the eastern Mediterranean Seaā€, and to the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011), as well as Croatian Ministry of Science, Education and Sports for supporting project ā€œBenthic communities in the Adriatic Sea (Project ID: 0001005)ā€. Open access via Springer Compact AgreementPeer reviewedPublisher PD

    New records and observations of macroalgae and associated pathogens from the Falkland Islands, Patagonia and Tierra del Fuego

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    Subantarctic and Antarctic regions remain little explored with regards to their seaweed diversity. This study is based upon collections in the early 1970s and 2007ā€“2013. It is supported by sequencing COI (mitochondrial cytochrome oxidase I) and reports new records for four species of brown algae Hincksia granulosa, Hincksia sandriana, Myriotrichia clavaeformis, Syringoderma australe), four red algae (Erythrotrichia carnea, Paraglossum salicifolium, Phycodrys antarctica, Plumariopsis eatonii), one green alga (Chaetomorpha aerea) and of the oomycete Anisolpidium ectocarpii. A further four brown algae are reported at genus level and discussed (Cladostephus sp., Colpomenia sp., Dictyota sp., Punctaria sp.). Observations of the biology of three brown algal taxa (Cladothele decaisnei, Geminocarpus geminatus, Halopteris obovata) from the region are also reported here

    Ecophysiology of Kuwaiti macroalgae with special emphasis on temperature and salinity tolerance related to the conditions at desalination plant outfalls

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    ACKNOWLEDGEMENTS The present work is part of the PhD thesis 'Macroalgal biodiversity of Kuwait, with special emphasis on the vicinity of desalination plants' of Amal H. Hajiya Hasan. We acknowledge the technical assistance of Dr. Hedda Weitz and Mr Mohamed Elgamily for ArcGIS assistance. We acknowledge the funding received to support this work from the Marine Alliance for Science and Technology (grant reference HR09011) to FCK and Kuwait Foundation for the Advancement of Science (KFAS; grant number PR1712SL18) to DA.Peer reviewedPostprin

    Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north-western Indian Ocean

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    ACKNOWLEDGMENTS Many thanks to Bivin Thomas, Pupa Kumai and Hedda Weitz for helping in the laboratory and improving this manuscript, to Ioanna Kosma for diving, to Yusuf Buhadi for assistance during field work, archiving and preparation of herbarium specimens, and to Tatiana Mikhaylova for micrographs of previously collected filamentous red algae from Kuwait. We are grateful to Laā€²ala Kuwait Real Estate Company and especially Mr. Fawaz Al-Marzouq for providing the salinity data. The present work is part of MHH's PhD thesis ā€˜Macroalgal biodiversity of Kuwait, with special emphasis on the vicinity of desalination plantsā€™ funded by a PhD fellowship from the Kuwait Foundation for the Advancement of Sciences. FCK received support from the Marine Alliance for Science and Technology for Scotland pooling initiative. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. Work of AFP was in part supported by the project IDEALG (France: ANR-10-BTBR-04). Research Funding Agence Nationale de la Recherche. Grant Number: 10-BTBR-04 Kuwait Foundation for the Advancement of Sciences Marine Alliance for Science and Technology for Scotland IDEALG. Grant Number: ANR-10-BTBR-04 Scottish Funding Council. Grant Number: HR09011 Marine Alliance for Science and Technology Kuwait Foundation for the Advancement of SciencesPeer reviewedPublisher PD

    Cosmopolitan geographic distribution of Phaeosaccion multiseriatum (Phaeosacciaceae, Phaeosacciophyceae), and description of P. westermeieri sp. nov. from Chile

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    Author Contributions: Conceptualization, A.F.P.; methodology, A.F.P.; software, A.F.P., N.J. and L.A.M.; validation, A.F.P.; formal analysis, L.A.M., A.F.P.; investigation, A.F.P., G.Y.C., A.R. and N.J.; resources, A.F.P, G.Y.C. and F.C.K.; data curation, A.F.P.; writingā€”original draft preparation, A.F.P.; writingā€”review and editing, A.F.P., M.D.G and all co-authors; visualization, A.F.P.; supervision, A.F.P.; project administration, A.F.P.; funding acquisition, A.F.P, G.Y.C. and F.C.K. The authors have accepted responsibility for the entire content of this manuscript and approved its submission. Persons: We appreciated assistance in the field by A. Montecinos, M.-L. Guillemin, S. Faugeron, E. Kytinou, Steve Cartwright and K.J. Yoon, and in the laboratory by H. Weitz.Peer reviewe
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