LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 21

Search options

  1. Article ; Online: Assessing healthcare access using the Levesque's conceptual framework- a scoping review.

    Cu, Anthony / Meister, Sofia / Lefebvre, Bertrand / Ridde, Valéry

    International journal for equity in health

    2021  Volume 20, Issue 1, Page(s) 116

    Abstract: Introduction: Countries are working hard to improve access to healthcare through Universal Healthcare Coverage. To genuinely address the problems of healthcare access, we need to recognize all the dimensions and complexities of healthcare access. ... ...

    Abstract Introduction: Countries are working hard to improve access to healthcare through Universal Healthcare Coverage. To genuinely address the problems of healthcare access, we need to recognize all the dimensions and complexities of healthcare access. Levesque's Conceptual Framework of Access to Health introduced in 2013 provides an interesting and comprehensive perspective through the five dimensions of access and the five abilities of the population to access healthcare. The objectives of this paper are to identify and analyze all empirical studies that applied Levesque's conceptual framework for access to healthcare and to explore the experiences and challenges of researchers who used this framework in developing tools for assessing access.
    Methods: A scoping review was conducted by searching through four databases, for studies citing Levesque et al. 2013 to select all empirical studies focusing on healthcare access that applied the framework. An initial 1838 documents underwent title screening, followed by abstract screening, and finally full text screening by two independent reviewers. Authors of studies identified from the scoping review were also interviewed.
    Results: There were 31 studies identified on healthcare access using the Levesque framework either a priori, to develop assessment tool/s (11 studies), or a posteriori, to organize and analyze collected data (20 studies). From the tools used, 147 unique questions on healthcare access were collected, 91 of these explored dimensions of access while 56 were about abilities to access. Those that were designed from the patient's perspective were 73%, while 20% were for health providers, and 7% were addressed to both. Interviews from seven out of the 26 authors, showed that while there were some challenges such as instances of categorization difficulty and unequal representation of dimensions and abilities, the overall experience was positive.
    Conclusion: Levesque's framework has been successfully used in research that explored, assessed, and measured access in various healthcare services and settings. The framework allowed researchers to comprehensively assess the complex and dynamic process of access both in the health systems and the population contexts. There is still potential room for improvement of the framework, particularly the incorporation of time-related elements of access.
    MeSH term(s) Health Services Accessibility/statistics & numerical data ; Health Services Research/methods ; Humans
    Language English
    Publishing date 2021-05-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2092056-8
    ISSN 1475-9276 ; 1475-9276
    ISSN (online) 1475-9276
    ISSN 1475-9276
    DOI 10.1186/s12939-021-01416-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Impact of global climate cooling on Ordovician marine biodiversity.

    Ontiveros, Daniel Eliahou / Beaugrand, Gregory / Lefebvre, Bertrand / Marcilly, Chloe Markussen / Servais, Thomas / Pohl, Alexandre

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 6098

    Abstract: Global cooling has been proposed as a driver of the Great Ordovician Biodiversification Event, the largest radiation of Phanerozoic marine animal Life. Yet, mechanistic understanding of the underlying pathways is lacking and other possible causes are ... ...

    Abstract Global cooling has been proposed as a driver of the Great Ordovician Biodiversification Event, the largest radiation of Phanerozoic marine animal Life. Yet, mechanistic understanding of the underlying pathways is lacking and other possible causes are debated. Here we couple a global climate model with a macroecological model to reconstruct global biodiversity patterns during the Ordovician. In our simulations, an inverted latitudinal biodiversity gradient characterizes the late Cambrian and Early Ordovician when climate was much warmer than today. During the Mid-Late Ordovician, climate cooling simultaneously permits the development of a modern latitudinal biodiversity gradient and an increase in global biodiversity. This increase is a consequence of the ecophysiological limitations to marine Life and is robust to uncertainties in both proxy-derived temperature reconstructions and organism physiology. First-order model-data agreement suggests that the most conspicuous rise in biodiversity over Earth's history - the Great Ordovician Biodiversification Event - was primarily driven by global cooling.
    MeSH term(s) Animals ; Biodiversity ; Climate ; Temperature ; Cold Temperature ; Fossils
    Language English
    Publishing date 2023-10-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41685-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: No (Cambrian) explosion and no (Ordovician) event: A single long-term radiation in the early Palaeozoic

    Servais, Thomas / Cascales-Miñana, Borja / Harper, David A.T. / Lefebvre, Bertrand / Munnecke, Axel / Wang, Wenhui / Zhang, Yuandong

    Palaeogeography, Palaeoclimatology, Palaeoecology. 2023 Aug., v. 623 p.111592-

    2023  

    Abstract: The Cambrian ‘Explosion’, located by many authors between 540 and 520 million years ago (Ma), is considered to be an abrupt appearance in the fossil record of most animal phyla, with a sudden increase of complex morphologies across metazoan groups. In a ... ...

    Abstract The Cambrian ‘Explosion’, located by many authors between 540 and 520 million years ago (Ma), is considered to be an abrupt appearance in the fossil record of most animal phyla, with a sudden increase of complex morphologies across metazoan groups. In a few recent papers, the Great Ordovician Biodiversification ‘Event’ (GOBE) has similarly been restricted to a single dramatic biodiversification ‘event’ in the Darriwilian Stage of the Middle Ordovician Series, between 470 and 455 Ma, although historically the biodiversification is considered as an aggregation of radiation ‘events’ capturing a large and complex increase of taxonomic diversity of marine invertebrates covering the entire Ordovician. A review of biodiversity curves of marine organisms during the early Palaeozoic, including some based on data in the Paleobiology Database (PBDB) and the Geobiodiversity Database (GBDB), points towards a single, large-scale, long-term early Palaeozoic radiation of life that already started in the late Precambrian. An abrupt ‘explosion’ of diversity in the Cambrian or a significant ‘event’ in the Ordovician are not visible in our biodiversity studies, because they are either regional, or only reflect a single group of organisms. It is evident that the datasets remain incomplete, in particular those for many geographical areas and for several fossil groups, that are not covered by the PBDB and GBDB; also, such areas remain so far poorly or entirely unstudied. Some recently published biodiversity curves have to be considered with care, as the truly global diversity estimates of marine organisms during the early Palaeozoic remain elusive. Here, we argue that published curves of taxonomic richness, which show distinct periods of diversification, cannot sufficiently be disentangled from biases. We therefore question the existence of a distinct Cambrian ‘Explosion’ and global Ordovician ‘Event’ in the global datasets. Both terms, Cambrian ‘Explosion’ and Great Ordovician Biodiversification ‘Event should be used as conceptional terms only. The first represents the appearance of almost all animal phyla during the late Precambrian and early Cambrian, whereas the second term embraces the numerous and complex radiations that occurred during the entire Ordovician.
    Keywords Animalia ; Cambrian period ; Ordovician period ; Precambrian time ; animals ; data collection ; databases ; fossils ; palaeogeography ; paleoclimatology ; paleoecology ; species diversity ; Cambrian Explosion ; Great Ordovician Biodiversification Event ; Radiation ; Biodiversity ; Paleobiology Database ; Geobiodiversity Database
    Language English
    Dates of publication 2023-08
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 417718-6
    ISSN 0031-0182
    ISSN 0031-0182
    DOI 10.1016/j.palaeo.2023.111592
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  4. Article ; Online: Importance of Public Transport Networks for Reconciling the Spatial Distribution of Dengue and the Association of Socio-Economic Factors with Dengue Risk in Bangkok, Thailand.

    Lefebvre, Bertrand / Karki, Rojina / Misslin, Renaud / Nakhapakorn, Kanchana / Daudé, Eric / Paul, Richard E

    International journal of environmental research and public health

    2022  Volume 19, Issue 16

    Abstract: Dengue is the most widespread mosquito-borne viral disease of man and spreading at an alarming rate. Socio-economic inequality has long been thought to contribute to providing an environment for viral propagation. However, identifying socio-economic (SE) ...

    Abstract Dengue is the most widespread mosquito-borne viral disease of man and spreading at an alarming rate. Socio-economic inequality has long been thought to contribute to providing an environment for viral propagation. However, identifying socio-economic (SE) risk factors is confounded by intra-urban daily human mobility, with virus being ferried across cities. This study aimed to identify SE variables associated with dengue at a subdistrict level in Bangkok, analyse how they explain observed dengue hotspots and assess the impact of mobility networks on such associations. Using meteorological, dengue case, national statistics, and transport databases from the Bangkok authorities, we applied statistical association and spatial analyses to identify SE variables associated with dengue and spatial hotspots and the extent to which incorporating transport data impacts the observed associations. We identified three SE risk factors at the subdistrict level: lack of education, % of houses being cement/brick, and number of houses as being associated with increased risk of dengue. Spatial hotspots of dengue were found to occur consistently in the centre of the city, but which did not entirely have the socio-economic risk factor characteristics. Incorporation of the intra-urban transport network, however, much improved the overall statistical association of the socio-economic variables with dengue incidence and reconciled the incongruous difference between the spatial hotspots and the SE risk factors. Our study suggests that incorporating transport networks enables a more real-world analysis within urban areas and should enable improvements in the identification of risk factors.
    MeSH term(s) Animals ; Cities/epidemiology ; Dengue/epidemiology ; Economic Factors ; Humans ; Male ; Risk Factors ; Socioeconomic Factors ; Thailand/epidemiology
    Language English
    Publishing date 2022-08-16
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2175195-X
    ISSN 1660-4601 ; 1661-7827
    ISSN (online) 1660-4601
    ISSN 1661-7827
    DOI 10.3390/ijerph191610123
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: A Scoping Review on Air Quality Monitoring, Policy and Health in West African Cities.

    Mir Alvarez, Celia / Hourcade, Renaud / Lefebvre, Bertrand / Pilot, Eva

    International journal of environmental research and public health

    2020  Volume 17, Issue 23

    Abstract: Ambient air pollution is a global health threat that causes severe mortality and morbidity from respiratory, cardiovascular, and other diseases. Its impact is especially concerning in cities; as the urban population increases, especially in low- and ... ...

    Abstract Ambient air pollution is a global health threat that causes severe mortality and morbidity from respiratory, cardiovascular, and other diseases. Its impact is especially concerning in cities; as the urban population increases, especially in low- and middle-income countries, large populations risk suffering from these health effects. The Economic Community of West African States (ECOWAS) comprises 15 West African countries, in which many cities are currently experiencing fast growth and industrialization. However, government-led initiatives in air quality monitoring are scarce in ECOWAS countries, which makes it difficult to effectively control and regulate air quality and subsequent health issues. A scoping study was performed following the Arksey and O'Malley methodological framework in order to assess the precise status of air quality monitoring, related policy, and legislation in this region. Scientific databases and gray literature searches were conducted, and the results were contrasted through expert consultations. It was found that only two ECOWAS countries monitor air quality, and most countries have insufficient legislation in place. Public health surveillance data in relation to air quality data is largely unavailable. In order to address this, improved air quality surveillance, stricter and better-enforced regulations, regional cooperation, and further research are strongly suggested for ECOWAS.
    MeSH term(s) Africa, Western ; Air Pollution ; Cities/statistics & numerical data ; Cote d'Ivoire ; Environmental Monitoring ; Environmental Policy ; Humans ; Nigeria ; Policy ; Senegal
    Language English
    Publishing date 2020-12-07
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ISSN 1660-4601
    ISSN (online) 1660-4601
    DOI 10.3390/ijerph17239151
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: Biogenic Iron Preserves Structures during Fossilization: A Hypothesis: Iron from Decaying Tissues May Stabilize Their Morphology in the Fossil Record

    Saleh, Farid / Daley, Allison C / Lefebvre, Bertrand / Pittet, Bernard / Perrillat, Jean Philippe

    BioEssays. 2020 June, v. 42, no. 6

    2020  

    Abstract: It is hypothesized that iron from biological tissues, liberated during decay, may have played a role in inhibiting loss of anatomical information during fossilization of extinct organisms. Most tissues in the animal kingdom contain iron in different ... ...

    Abstract It is hypothesized that iron from biological tissues, liberated during decay, may have played a role in inhibiting loss of anatomical information during fossilization of extinct organisms. Most tissues in the animal kingdom contain iron in different forms. A widely distributed iron‐bearing molecule is ferritin, a globular protein that contains iron crystallites in the form of ferrihydrite minerals. Iron concentrations in ferritin are high and ferrihydrites are extremely reactive. When ancient animals are decaying on the sea floor under anoxic environmental conditions, ferrihydrites may initialize the selective replication of some tissues in pyrite FeS₂. This model explains why some labile tissues are preserved, while other more resistant structures decay and are absent in many fossils. A major implication of this hypothesis is that structures described as brains in Cambrian arthropods are not fossilization artifacts, but are instead a source of information on anatomical evolution at the dawn of complex animal life.
    Keywords Cambrian period ; evolution ; ferrihydrite ; ferritin ; fossils ; information sources ; iron ; models ; pyrite
    Language English
    Dates of publication 2020-06
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 50140-2
    ISSN 1521-1878 ; 0265-9247
    ISSN (online) 1521-1878
    ISSN 0265-9247
    DOI 10.1002/bies.201900243
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  7. Article ; Online: Biogenic Iron Preserves Structures during Fossilization: A Hypothesis: Iron from Decaying Tissues May Stabilize Their Morphology in the Fossil Record.

    Saleh, Farid / Daley, Allison C / Lefebvre, Bertrand / Pittet, Bernard / Perrillat, Jean Philippe

    BioEssays : news and reviews in molecular, cellular and developmental biology

    2020  Volume 42, Issue 6, Page(s) e1900243

    Abstract: It is hypothesized that iron from biological tissues, liberated during decay, may have played a role in inhibiting loss of anatomical information during fossilization of extinct organisms. Most tissues in the animal kingdom contain iron in different ... ...

    Abstract It is hypothesized that iron from biological tissues, liberated during decay, may have played a role in inhibiting loss of anatomical information during fossilization of extinct organisms. Most tissues in the animal kingdom contain iron in different forms. A widely distributed iron-bearing molecule is ferritin, a globular protein that contains iron crystallites in the form of ferrihydrite minerals. Iron concentrations in ferritin are high and ferrihydrites are extremely reactive. When ancient animals are decaying on the sea floor under anoxic environmental conditions, ferrihydrites may initialize the selective replication of some tissues in pyrite FeS
    MeSH term(s) Animals ; Arthropods ; Biological Evolution ; Brain ; Fossils ; Iron ; Preservation, Biological
    Chemical Substances Iron (E1UOL152H7)
    Language English
    Publishing date 2020-04-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 50140-2
    ISSN 1521-1878 ; 0265-9247
    ISSN (online) 1521-1878
    ISSN 0265-9247
    DOI 10.1002/bies.201900243
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: The Cabrières Biota (France) provides insights into Ordovician polar ecosystems.

    Saleh, Farid / Lustri, Lorenzo / Gueriau, Pierre / Potin, Gaëtan J-M / Pérez-Peris, Francesc / Laibl, Lukáš / Jamart, Valentin / Vite, Antoine / Antcliffe, Jonathan B / Daley, Allison C / Nohejlová, Martina / Dupichaud, Christophe / Schöder, Sebastian / Bérard, Emilie / Lynch, Sinéad / Drage, Harriet B / Vaucher, Romain / Vidal, Muriel / Monceret, Eric /
    Monceret, Sylvie / Lefebvre, Bertrand

    Nature ecology & evolution

    2024  Volume 8, Issue 4, Page(s) 651–662

    Abstract: Early Palaeozoic sites with soft-tissue preservation are predominantly found in Cambrian rocks and tend to capture past tropical and temperate ecosystems. In this study, we describe the diversity and preservation of the Cabrières Biota, a newly ... ...

    Abstract Early Palaeozoic sites with soft-tissue preservation are predominantly found in Cambrian rocks and tend to capture past tropical and temperate ecosystems. In this study, we describe the diversity and preservation of the Cabrières Biota, a newly discovered Early Ordovician Lagerstätte from Montagne Noire, southern France. The Cabrières Biota showcases a diverse polar assemblage of both biomineralized and soft-bodied organisms predominantly preserved in iron oxides. Echinoderms are extremely scarce, while sponges and algae are abundantly represented. Non-biomineralized arthropod fragments are also preserved, along with faunal elements reminiscent of Cambrian Burgess Shale-type ecosystems, such as armoured lobopodians. The taxonomic diversity observed in the Cabrières Biota mixes Early Ordovician Lagerstätten taxa with Cambrian forms. By potentially being the closest Lagerstätte to the South Pole, the Cabrières Biota probably served as a biotic refuge amid the high-water temperatures of the Early Ordovician, and shows comparable ecological structuring to modern polar communities.
    MeSH term(s) Animals ; Ecosystem ; Fossils ; Biota ; Arthropods ; Echinodermata
    Language English
    Publishing date 2024-02-09
    Publishing country England
    Document type Journal Article
    ISSN 2397-334X
    ISSN (online) 2397-334X
    DOI 10.1038/s41559-024-02331-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Contrasting Early Ordovician assembly patterns highlight the complex initial stages of the Ordovician Radiation.

    Saleh, Farid / Guenser, Pauline / Gibert, Corentin / Balseiro, Diego / Serra, Fernanda / Waisfeld, Beatriz G / Antcliffe, Jonathan B / Daley, Allison C / Mángano, M Gabriela / Buatois, Luis A / Ma, Xiaoya / Vizcaïno, Daniel / Lefebvre, Bertrand

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 3852

    Abstract: The Early Ordovician is a key interval for our understanding of the evolution of life on Earth as it lays at the transition between the Cambrian Explosion and the Ordovician Radiation and because the fossil record of the late Cambrian is scarce. In this ... ...

    Abstract The Early Ordovician is a key interval for our understanding of the evolution of life on Earth as it lays at the transition between the Cambrian Explosion and the Ordovician Radiation and because the fossil record of the late Cambrian is scarce. In this study, assembly processes of Early Ordovician trilobite and echinoderm communities from the Central Anti-Atlas (Morocco), the Montagne Noire (France), and the Cordillera Oriental (Argentina) are explored. The results show that dispersal increased diachronically in trilobite communities during the Early Ordovician. Dispersal did not increase for echinoderms. Dispersal was most probably proximally triggered by the planktic revolution, the fall in seawater temperatures, changes in oceanic circulation, with an overall control by tectonic frameworks and phylogenetic constraints. The diachronous increase in dispersal within trilobite communities in the Early Ordovician highlights the complexity of ecosystem structuring during the early stages of the Ordovician Radiation. As Early Ordovician regional dispersal was followed by well-documented continental dispersal in the Middle/Late Ordovician, it is possible to consider that alongside a global increase in taxonomic richness, the Ordovician Radiation is also characterized by a gradual increase in dispersal.
    MeSH term(s) Animals ; Biological Evolution ; Earth, Planet ; Echinodermata ; Ecosystem ; Fossils ; Phylogeny
    Language English
    Publishing date 2022-03-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-07822-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: New fossil assemblages from the Early Ordovician Fezouata Biota.

    Saleh, Farid / Vaucher, Romain / Vidal, Muriel / Hariri, Khadija El / Laibl, Lukáš / Daley, Allison C / Gutiérrez-Marco, Juan Carlos / Candela, Yves / Harper, David A T / Ortega-Hernández, Javier / Ma, Xiaoya / Rida, Ariba / Vizcaïno, Daniel / Lefebvre, Bertrand

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 20773

    Abstract: The Fezouata Biota (Morocco) is a unique Early Ordovician fossil assemblage. The discovery of this biota revolutionized our understanding of Earth's early animal diversifications-the Cambrian Explosion and the Ordovician Radiation-by suggesting an ... ...

    Abstract The Fezouata Biota (Morocco) is a unique Early Ordovician fossil assemblage. The discovery of this biota revolutionized our understanding of Earth's early animal diversifications-the Cambrian Explosion and the Ordovician Radiation-by suggesting an evolutionary continuum between both events. Herein, we describe Taichoute, a new fossil locality from the Fezouata Shale. This locality extends the temporal distribution of fossil preservation from this formation into the upper Floian, while also expanding the range of depositional environments to more distal parts of the shelf. In Taichoute, most animals were transported by density flows, unlike the in-situ preservation of animals recovered in previously investigated Fezouata sites. Taichoute is dominated by three-dimensionally preserved, and heavily sclerotized fragments of large euarthropods-possibly representing nektobenthic/nektic bivalved taxa and/or hurdiid radiodonts. Resolving whether this dominance reflects a legitimate aspect of the original ecosystem or a preservational bias requires an in-depth assessment of the environmental conditions at this site. Nevertheless, Taichoute provides novel preservational and palaeontological insights during a key evolutionary transition in the history of life on Earth.
    MeSH term(s) Animals ; Fossils ; Ecosystem ; Biota ; Biological Evolution ; Minerals
    Chemical Substances Minerals
    Language English
    Publishing date 2022-12-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-25000-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top