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  • 1
    Publication Date: 2016-03-05
    Description: How does an animal know where it is when it stops moving? Hippocampal place cells fire at discrete locations as subjects traverse space, thereby providing an explicit neural code for current location during locomotion. In contrast, during awake immobility, the hippocampus is thought to be dominated by neural firing representing past and possible future experience. The question of whether and how the hippocampus constructs a representation of current location in the absence of locomotion has been unresolved. Here we report that a distinct population of hippocampal neurons, located in the CA2 subregion, signals current location during immobility, and does so in association with a previously unidentified hippocampus-wide network pattern. In addition, signalling of location persists into brief periods of desynchronization prevalent in slow-wave sleep. The hippocampus thus generates a distinct representation of current location during immobility, pointing to mnemonic processing specific to experience occurring in the absence of locomotion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kay, Kenneth -- Sosa, Marielena -- Chung, Jason E -- Karlsson, Mattias P -- Larkin, Margaret C -- Frank, Loren M -- R01 MH090188/MH/NIMH NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 10;531(7593):185-90. doi: 10.1038/nature17144. Epub 2016 Mar 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UCSF Center for Integrative Neuroscience and Department of Physiology, University of California San Francisco, California 94158, USA. ; Howard Hughes Medical Institute, University of California San Francisco, California 94158, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26934224" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Hippocampus/anatomy & histology/*cytology/*physiology ; Male ; Models, Neurological ; Movement ; Neurons/*physiology ; Orientation/*physiology ; Rats ; Rats, Long-Evans ; Sleep/*physiology ; Space Perception/*physiology ; Spatial Memory/physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2021-05-19
    Description: Se utiliza la información de perfiles de playa en cuatro localidades de las Playas del Este obtenidos en los últimos 27 años, para describir la tendencia de la playa a mediano plazo. A partir de datos de posición de la línea de costa y de volúmenes de arena de la playa emergida se estableció la tasa de cambio de la playa utilizando la regresión lineal simple. Los resultados confirman la tendencia erosiva de un sector de la playa de Guanabo. La tasa anual de retroceso de la línea de costa ha sido de -0.97 m/año que ha establecido un cambio total de - 26 ±7 m. La reducción de los volúmenes de arena ha sido de -28 ± 8 m3/m, a un ritmo de -1.04 m3/m/año. En la playa de Santa María, la línea de costa en algunas localidades ha experimentado retroceso y en otras ha ocurrido poco cambio, sin embargo en todos los casos se ha producido un incremento notable en los volúmenes de arena de la playa emergida debido a la formación y crecimiento de las dunas. La reactivación de los procesos eólicos que dio lugar al restablecimiento de la morfología de dunas fue posible por la eliminación del bosque de casuarinas que, durante más de 20 años, ocupó la zona posterior de la playa.
    Description: The information of beach profiles, obtained during the last 27 years in four localities of Playas del Este, is used to describe the medium-term tendency of the beach. Starting from data of the shoreline location and sand volumes of the emerged beach, the beach change rate was established applying simple linear regression. The results confirm the erosive tendency of a sector in Guanabo beach. The annual rate of shoreline retreat has been -0, 97 m/y, which has established a total change of - 26 ± 7 m. The reduction in sand volumes has been -28 ± 8 m3/m, at a rate of -1,04 m3/m/y. In Santa Maria beach, the shoreline has experienced retreat in some localities or little change in the others. However, a remarkable increase in sand volumes of the emerged beach has taken place in all the cases. The reactivation of Aeolian processes, resulting in the reestablishment of dune morphology, was possible due to the removal of the Australian pine forest that had occupied the area from the beach top landward for more than 20 years.
    Description: Published
    Description: playas, evolución a mediano plazo, regresión lineal, beach, medium- term evolution, lineal regression.
    Keywords: Dunes ; Beach morphology ; Beach erosion ; Dunes
    Repository Name: AquaDocs
    Type: Journal Contribution
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