ORCID Profile
0000-0003-3222-5880
Current Organisation
CNRS
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Publisher: Copernicus GmbH
Date: 24-01-2019
Abstract: Abstract. The disequilibrium between 210Po activity and 210Pb activity in seawater s les was determined along the GEOTRACES GA01 transect in the North Atlantic during the GEOVIDE cruise (May–June 2014). A steady-state model was used to quantify vertical export of particulate 210Po. Vertical advection was incorporated into one version of the model using time-averaged vertical velocity, which had substantial variance. This resulted in large uncertainties for the 210Po export flux in this model, suggesting that those calculations of 210Po export fluxes should be used with great care. Despite the large uncertainties, there is no question that the deficits of 210Po in the Iberian Basin and at the Greenland Shelf have been strongly affected by vertical advection. Using the export flux of 210Po and the particulate organic carbon (POC) to 210Po ratio of total ( 1 µm) particles, we determined the POC export fluxes along the transect. Both the magnitude and efficiency of the estimated POC export flux from the surface ocean varied spatially within our study region. Export fluxes of POC ranged from negligible to 10 mmol C m−2 d−1, with enhanced POC export in the Labrador Sea. The cruise track was characterized by overall low POC export relative to net primary production (export efficiency 1 %–15 %), but relatively high export efficiencies were seen in the basins where diatoms dominated the phytoplankton community. The particularly low export efficiencies in the Iberian Basin, on the other hand, were explained by the dominance of smaller phytoplankton, such as cyanobacteria or coccolithophores. POC fluxes estimated from the 210Po∕210Pb and 234Th∕238U disequilibria agreed within a factor of 3 along the transect, with higher POC estimates generally derived from 234Th. The differences were attributed to integration timescales and the history of bloom events.
Publisher: Elsevier BV
Date: 11-2016
Publisher: Wiley
Date: 21-12-2018
DOI: 10.1111/GER.12386
Abstract: To conduct a model-based cost-effectiveness analysis, from a health care system perspective, of using oral health professionals to provide oral hygiene services at residential aged care facilities (RACFs) in Victoria, Australia, compared to current practice (CP). Increasingly dentate cohorts of older adults are entering RACFs, making urgent the need of further development and provision of oral health programmes in ageing dentitions. The model was based on 47 624 RACFs' places in Victoria over one year. The main outcome measured was "cost per pneumonia case averted." Four different scenarios of oral hygiene provision were compared to CP. Costs included were RACF staff training, professional salaries, programme coordinator office expenses, dental equipment and hospitalisation costs. Effectiveness assumptions for each scenario were based on systematic reviews and randomised control trials. All four scenarios were dominant strategies. The magnitude of negative incremental cost-effectiveness ratio was not informative therefore, incremental costs and incremental effectiveness were used to present results. "Professional oral health care (POHC) provision once every two weeks and current provision of oral health care the other days" was the most cost-saving alternative (AU $896 per resident saved). The most effective alternative was "POHC provision once a week and non-POHC provision by trained Nurse aids twice per day the other days" (6779 pneumonia cases averted). One-way sensitivity analyses confirmed the robustness of results. The four scenarios were highly cost-effective compared to CP. These results could be a strong basis to implement new oral health programmes in Australian RACFs.
No related grants have been discovered for Nolwenn Lemaitre.