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  • 11
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    Identification and characterization of novel cecropins from the Oxysternon conspicillatum neotropic dung beetle (2017)
    Public Library of Science
    Details
    Publication Date: 2017-11-29
    Electronic ISSN: 1932-6203
    Topics: Medicine , Natural Sciences in General
    Published by Public Library of Science
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    PAPER CURRENT
  • 12
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    Synesthesia does not help to recover perceptual dominance following flash suppression (2021)
    Springer Nature
    Details
    Publication Date: 2021-04-07
    Description: Grapheme-colour synesthesia occurs when letters or numbers elicit an abnormal colour sensation (e.g., printed black letters are perceived as coloured). This phenomenon is typically reported following explicit presentation of graphemes. Very few studies have investigated colour sensations in synesthesia in the absence of visual awareness. We took advantage of the dichoptic flash suppression paradigm to temporarily render a stimulus presented to one eye invisible. Synesthetic alphanumeric and non-synesthetic stimuli were presented to 21 participants (11 synesthetes) in achromatic and chromatic experimental conditions. The test stimulus was first displayed to one eye and then masked by a sudden presentation of visual noise in the other eye (flash suppression). The time for an image to be re-perceived following the onset of the suppressive noise was calculated. Trials where there was no flash suppression performed but instead mimicked the perceptual suppression of the flash were also tested. Results showed that target detection by synesthetes was significantly better than by controls in the absence of flash suppression. No difference was found between the groups in the flash suppression condition. Our findings suggest that synesthesia is associated with enhanced perception for overt recognition, but does not provide an advantage in recovering from a perceptual suppression. Further studies are needed to investigate synesthesia in relation to visual awareness.
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 13
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    Slow Wave Sleep and Long Duration Spaceflight (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: While ground research has clearly shown that preserving adequate quantities of sleep is essential for optimal health and performance, changes in the progression, order and /or duration of specific stages of sleep is also associated with deleterious outcomes. As seen in Figure 1, in healthy individuals, REM and Non-REM sleep alternate cyclically, with stages of Non-REM sleep structured chronologically. In the early parts of the night, for instance, Non-REM stages 3 and 4 (Slow Wave Sleep, or SWS) last longer while REM sleep spans shorter; as night progresses, the length of SWS is reduced as REM sleep lengthens. This process allows for SWS to establish precedence , with increases in SWS seen when recovering from sleep deprivation. SWS is indeed regarded as the most restorative portion of sleep. During SWS, physiological activities such as hormone secretion, muscle recovery, and immune responses are underway, while neurological processes required for long term learning and memory consolidation, also occur. The structure and duration of specific sleep stages may vary independent of total sleep duration, and changes in the structure and duration have been shown to be associated with deleterious outcomes. Individuals with narcolepsy enter sleep through REM as opposed to stage 1 of NREM. Disrupting slow wave sleep for several consecutive nights without reducing total sleep duration or sleep efficiency is associated with decreased pain threshold, increased discomfort, fatigue, and the inflammatory flare response in skin. Depression has been shown to be associated with a reduction of slow wave sleep and increased REM sleep. Given research that shows deleterious outcomes are associated with changes in sleep structure, it is essential to characterize and mitigate not only total sleep duration, but also changes in sleep stages.
    Keywords: Aerospace Medicine
    Type: JSC-CN-25849 , HRP Investigators'' Workshop; Feb 14, 2012 - Feb 16, 2012; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Building a Shared Definitional Model of Long Duration Human Spaceflight (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Objective: To establish the need for a shared definitional model of long duration human spaceflight, that would provide a framework and vision to facilitate communication, research and practice In 1956, on the eve of human space travel, Hubertus Strughold first proposed a "simple classification of the present and future stages of manned flight" that identified key factors, risks and developmental stages for the evolutionary journey ahead. As we look to new destinations, we need a current shared working definitional model of long duration human space flight to help guide our path. Here we describe our preliminary findings and outline potential approaches for the future development of a definition and broader classification system
    Keywords: Documentation and Information Science
    Type: JSC-CN-25874 , HRP Investigator''s Workshop; Feb 14, 2012 - Feb 16, 2012; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Evidence Report: Risk of Hypobaric Hypoxia from the Exploration Atmosphere (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Extravehicular activity (EVA) is at the core of a manned space exploration program. Some elements of exploration may be safely and effectively performed by robots, but certain critical elements will require the trained, assertive, and reasoning mind of a human crewmember. To effectively use these skills, NASA needs a safe, effective, and efficient EVA component integrated into the human exploration program. The EVA preparation time should be minimized and the suit pressure should be low to accommodate EVA tasks without causing undue fatigue, physical discomfort, or suit-related trauma. Commissioned in 2005, the Exploration Atmospheres Working Group (EAWG) had the primary goal of recommending to NASA an internal environment that allowed efficient and repetitive EVAs for missions that were to be enabled by the former Constellation Program. At the conclusion of the EAWG meeting, the 8.0 psia and 32% oxygen (O2) environment were recommended for EVA-intensive phases of missions. After re-evaluation in 2012, the 8/32 environment was altered to 8.2 psia and 34% O2 to reduce the hypoxic stress to a crewmember. These two small changes increase alveolar O2 pressure by 11 mmHg, which is expected to significantly benefit crewmembers. The 8.2/34 environment (inspired O2 pressure = 128 mmHg) is also physiologically equivalent to the staged decompression atmosphere of 10.2 psia / 26.5% O2 (inspired O2 pressure = 127 mmHg) used on 34 different shuttle missions for approximately a week each flight. As a result of selecting this internal environment, NASA gains the capability for efficient EVA with low risk of decompression sickness (DCS), but not without incurring the additional negative stimulus of hypobaric hypoxia to the already physiologically challenging spaceflight environment. This report provides a review of the human health and performance risks associated with the use of the 8.2 psia / 34% O2 environment during spaceflight. Of most concern are the potential effects on the central nervous system (CNS), including increased intracranial pressure, visual impairment, sensorimotor dysfunction, and oxidative damage. Other areas of focus include validation of the DCS mitigation strategy, incidence and treatment of transient acute mountain sickness (AMS), development of new exercise countermeasure protocols, effective food preparation at 8.2 psia, assurance of quality sleep, and prevention of suit-induced injury. Although missions proposing to use an 8.2/34 environment are still years away, it is recommended that these studies begin early enough to ensure that the correct decisions pertaining to vehicle design, mission operational concepts, and human health countermeasures are appropriately informed.
    Keywords: Oceanography
    Type: JSC-CN-34806
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    Atlas geomorfológico del Litoral Caribe colombiano (2021)
    Editorial Dimar | Cartagena de indias, Colombia
    Details
    Publication Date: 2021-08-12
    Description: El Atlas incluye la recopilación de 124 mapas, elaborados a escala 1:50000 de la totalidad de la franja litoral del Caribe colombiano, comprendida entre Castilletes, en el departamento de La Guajira, y Cabo Tiburón, en el Chocó. Dicha cartografía ilustra la distribución espacial de los rasgos y unidades geomorfológicas de cada uno de los departamentos que hacen parte del Caribe colombiano, sin olvidar al departamento Archipiélago de San Andrés, Providencia y Santa Catalina; sustentada con una descripción que amplía la comprensión del tema, lo cual hace del Atlas una publicación de gran valor para el conocimiento y entendimiento de las características de nuestro Caribe.
    Description: Published
    Description: Not Known
    Keywords: Cartografía ; Erosión costera ; ASFA_2015::G::Geography ; ASFA_2015::G::Geomorphology ; ASFA_2015::C::Coastal erosion ; ASFA_2015::C::Cartography
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 225pp.
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  • 17
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    Atlas Geomorfológico del Litoral Caribe Colombiano. (2018)
    Dirección General Marítima | Cartagena, Colombia
    Details
    Publication Date: 2021-05-19
    Description: El Atlas incluye la recopilación de 124 mapas, elaborados a escala 1:50000 de la totalidad de la franja litoral del Caribe colombiano, comprendida entre Castilletes, en el departamento de La Guajira, y Cabo Tiburón, en el Chocó. Dicha cartografía ilustra la distribución espacial de los rasgos y unidades geomorfológicas de cada uno de los departamentos que hacen parte del Caribe colombiano, sin olvidar al departamento Archipiélago de San Andrés, Providencia y Santa Catalina; sustentada con una descripción que amplía la comprensión del tema, lo cual hace del Atlas una publicación de gran valor para el conocimiento y entendimiento de las características de nuestro Caribe.
    Description: Published
    Keywords: Erosión costera ; Cartografía ; ASFA_2015::G::Geomorphology ; ASFA_2015::O::Oceanographic atlases ; ASFA_2015::C::Coastal erosion
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings , Not Known
    Format: 225pp
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  • 18
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    Atlas geomorfológico del Litoral Caribe colombiano. Escala 1:5000. Libro I: Cartagena de Indias (2021)
    Editorial Dimar | Cartagena de Indias, Colombia
    Details
    Publication Date: 2021-08-07
    Description: La Dirección General Marítima a través del Centro de Investigaciones Oceanográficas e Hidrográficas del Caribe (CIOH), presenta a la comunidad científica y al público en general, un atlas de las unidades geomorfológicas costeras del litoral de la ciudad de Cartagena de Indias, consistente en una serie de mapas a escala 1:5000 que lo hacen, hasta el momento, la primera publicación con este nivel de detalle cartográfico. A manera de complemento, se han incluido en la presente publicación, un capítulo enfocado hacia la recopilación de los principios básicos de la geomorfología costera orientada hacia las personas interesadas en entender cómo las características costeras (tales como acantilados, playas, espigas o deltas) se han desarrollado y cómo están cambiando. El Atlas está dirigido a quienes comienzan en el estudio del tema, para estudiantes, ecólogos, ingenieros, planificadores y en general, hacia aquellos cuyo trabajo esté relacionado con las costas colombianas. Constituye un elemento de referencia para análisis más detallados y profundos, relacionados con el origen de las formas costeras y sus cambios ante los procesos costeros, para el planeamiento analítico y toma de decisiones para el manejo de la zona costera de Cartagena de Indias.
    Description: Published
    Description: Not Known
    Keywords: Geografía ; Mapa ; Sistema de información geográfica ; Zona costera ; ASFA_2015::G::Geography ; ASFA_2015::C::Coastal zone ; ASFA_2015::G::Geographic information systems ; ASFA_2015::C::Cartography
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 216pp.
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