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Foucan L.,University of Antilles and Guyane | Ducros J.,Dialysis Center | Merault H.,Dialysis Center | Merault H.,University Hospital
Journal of Nephrology | Year: 2012

Background: Vitamin D (vitD) insufficiency is common in end-stage renal disease. Seasonal and ethnic differences in vitD status have been reported previously. We hypothesized that vitD status in Afro-Caribbean patients on hemodialysis (HD) living in a country with a constant sunny climate would be better than that in African-American HD patients living in countries with a winter season. Method: A cross-sectional study was conducted in152 Afro-Caribbean HD patients in a dialysis center located in Guadeloupe. We evaluated the prevalence of vitD insufficiency, defined as serum 25-hydroxyvitamin D (25(OH)D) levels below 30 ng/mL, compared with those results previously reported in African-American HD patients (88%). Results: Prevalence of vitD insufficiency was 60% and thus lower than that in the African-American patients considered as the reference population (p<0.001). In our diabetic patients, this prevalence was 72.4%. Globally, 9.2% of patients had 25(OH)D below 15 ng/ mL. Alfacalcidol therapy was prescribed in 29%. Mean 25(OH)D levels were higher in treated than in untreated patients (32 vs. 27 ng/mL; p=0.009). Patients with vitD insufficiency had dyslipidemia and diabetes more frequently. No significant differences were found between patients with and without vitD insufficiency for serum calcium, phosphorus and parathyroid hormone (PTH). In untreated patients, no significant correlation was found between 25(OH)D and PTH levels. Conclusion: Prevalence of vitD insufficiency in Afro- Caribbean HD patients was lower than that previously reported in African Americans undergoing HD in the United States. This finding may be due to the constantly sunny weather with a high intensity of UVB radiation in Guadeloupe. © 2012 Società Italiana di Nefrologia.

Krika F.,Jijel University | Azzouz N.,Jijel University | Ncibi M.C.,University of Antilles and Guyane
International Journal of Environmental Science and Technology | Year: 2015

Posidonia oceanica (L.), a marine biomass, has been used as an effective and efficient biosorbent for the removal of Cd(II) from aqueous media. The physico-chemical properties of biosorbent were investigated by elemental analysis, BET surface area, FT-IR, SEM and EDX methods before and after adsorption. Batch adsorption experiments were carried out to investigate the effects of solution pH, dosage of biosorbent, contact time and temperature. The biosorbent exhibited the maximum uptake of 58.82 mg/g under the optimal adsorption condition. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data. Besides, experimental data could be better described by the Langmuir isotherm model. Desorption experiments were carried out to explore the feasibility of regenerating the biosorbent. The regeneration efficiency was 96.03 % using desorption agent of 0.2 M HCl. The thermodynamic parameters (ΔH0, ΔS0 and ΔG0) of the cadmium ion uptake onto P.O indicated that the process is endothermic and proceeds spontaneously. The findings of the present study indicate that P.O can be successfully used for separation of Cd(II) from aqueous solutions. The results suggested that the adsorbent is promising for use as an effective and economical adsorbent for Cd(II) ions removal. © 2014, Islamic Azad University (IAU).

Krika F.,Jijel University | Azzouz N.,Jijel University | Ncibi M.C.,University of Antilles and Guyane
International Journal of Environmental Research | Year: 2012

The biosorption of hexavelent chromium from saline solutions by Posidonia oceanica, a marine biomass, was studied as a function of pH, initial chromium (VI) and salt (NaCl) concentrations in batch system. The sorbent exhibited the maximal chromium (VI) uptake at pH 2 regardless of the presence of increasing salt concentration. Equilibrium uptake increased with chromium (VI) concentration up to 250 mg/ l and decreased slightly in the presence of increasing salt concentrations of salt up to 50 g/l. The biomass adsorbed 14.48 mg of metal per gram of biomass at 100 mg/l initial chromium concentration in the absence of salt. When 50 g/l salt concentration was added to the solution, the value diminished to 11.49 mg/g under the same conditions (i.e. a 20.6% decrease in the biosorption capacity). The equilibrium sorption data were analyzed using Freundlich, Langmuir and Redlich-Peterson models. The Langmuir equation was the most suitable adsorption model for describing the biosorption equilibrium data of chromium (VI) both in salt free and loaded media. The pseudo-second-order type kinetic model depicted the biosorption kinetics accurately at all chromium concentrations in absence and presence of increasing concentrations of salt.

Cadelis G.,Universitary Hospital of Pointe a Pitre | Tourres R.,Universitary Hospital of Pointe a Pitre | Molinie J.,University of Antilles and Guyane
PLoS ONE | Year: 2014

Background: The prevalence of asthma in children is a significant phenomenon in the Caribbean. Among the etiologic factors aggravating asthma in children, environmental pollution is one of the main causes. In Guadeloupe, pollution is primarily transported by Saharan dust including inhalable particles. Methods: This study assesses, over one year (2011), the short-term effects of pollutants referred to as PM10 (PM10: particulate matter <10 μm) and PM2.5-10 (PM2.5-10: particulate matter >2.5 mm and <10 μm) contained in Saharan dust, on the visits of children aged between 5 and 15 years for asthma in the health emergency department of the main medical facility of the archipelago of Guadeloupe. A time-stratified case-crossover model was applied and the data were analysed by a conditional logistic regression for all of the children but also for sub-groups corresponding to different age classes and genders. Results: The visits for asthma concerned 836 children including 514 boys and 322 girls. The Saharan dust has affected 15% of the days of the study (337 days) and involved an increase in the average daily concentrations of PM10 (49.7 μg/m3 vs. 19.2 μg/m3) and PM 2.5-10 (36.2 μg/m3 vs. 10.3 μg/m3) compared to days without dust. The excess risk percentages (IR%) for visits related to asthma in children aged between 5 and 15 years on days with dust compared to days without dust were, for PM10, ((IR %: 9.1% (CI95%, 7.1%-11.1%) versus 1.1%(CI95%, 25.9%-4.6%)) and for PM2.5-10 (IR%: 4.5%(CI95%, 2.5%-6.5%) versus 1.6% (CI95%, 21.1%-3.4%). There was no statistical difference in the IR% for periods with Saharan dust among different age group of children and between boys and girls for PM10 and PM2.5-10. Conclusion: The PM 10 and PM2.5-10 pollutants contained in the Saharan dust increased the risk of visiting the health emergency department for children with asthma in Guadeloupe during the study period. © 2014 Cadelis et al.

Ilies A.,University of Oradea | Dehoorne O.,University of Antilles and Guyane | Ilies D.C.,University of Oradea
Carpathian Journal of Earth and Environmental Sciences | Year: 2012

The external border of the EU and NATO is overlapping the state border between Romania and Ukraine, for a length of 440.1 km in a dominating mountain range of the Carpathians Mountains. By applying specific methods and tools we have identified in quantitative, qualitative and functionalsystemic terms, the factors that determine and the items that compose the functioning mechanisms of the Romanian and Ukrainian border contiguous areas. There were considered: the geographical location; the natural morpho-structural aspects; the morphological support profile of the state border; the legislative and administrative framework; the routes and communication networks; the historical, social and cultural elements etc. Based on the results obtained, new strategies can be generated for transforming these areas into a cross-border territorial system with high degree of functionality. Such a system has an important role in the process of social and economic integration and elimination of the traditional functions of the political frontier generating juxtaposed territorial systems.

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