The Experts below are selected from a list of 1041 Experts worldwide ranked by ideXlab platform

Patrick Seta - One of the best experts on this subject based on the ideXlab platform.

J Buffle - One of the best experts on this subject based on the ideXlab platform.

Omar Arous - One of the best experts on this subject based on the ideXlab platform.

  • elaboration and characterisation of a plasticized Cellulose Triacetate Membrane containing trioctylphosphine oxyde topo application to the transport of uranium and molybdenum ions
    Comptes Rendus Chimie, 2010
    Co-Authors: Naima Bayou, Omar Arous, Mourad Amara, Hacene Kerdjoudj
    Abstract:

    Abstract A Cellulose Triacetate (CTA) Membrane containing trioctylphosphine oxyde (TOPO) as carrier and 2-nitrophenyloctyl ether (NPOE) as a plasticizer was prepared. The Membrane CTA + NPOE + TOPO was characterised using chemical techniques as well as Fourier Transform InfraRed (FTIR) spectroscopy, X-ray diffraction and Scanning Electron Microscopy (SEM). The CTA Membrane is characterised by well-defined pores; these pores are completely filled with the NPOE and carrier. Surfaces of Membranes with TOPO are smooth. The systems constituted by the mixture of CTA + NPOE, CTA + NPOE + TOPO do not give any diffraction. This can be due to the absence of crystallization within the Membrane. On the other hand, this result should be attributable to the amorphous state of the structure, which permits us to eliminate the mechanism of transfer of the ions by electron jump. A comparative study of transport across a polymer inclusion Membrane (PIM) and a supported liquid Membrane (SLM) containing the same carrier in chloroform has shown that uranium or molybdenum transport efficiency was increased using PIM instead of SLM. PIM showed higher stability than SLM, the flux of transport remain constant in the former case after 2 weeks.

  • comparison of carrier facilitated silver i and copper ii ions transport mechanisms in a supported liquid Membrane and in a plasticized Cellulose Triacetate Membrane
    Journal of Membrane Science, 2004
    Co-Authors: Omar Arous, Hacene Kerdjoudj, Patrick Seta
    Abstract:

    Abstract Transport of silver and copper ions through a plasticized Cellulose Triacetate Membrane (CTA) containing macrocylic polyethers as carrier and 2-nitro phenyl octyl ether (NPOE) as plasticizer has been investigated. The Membrane CTA–NPOE–Carrier was characterised using chemical techniques for metal ion transport as well as Fourier transform infra-red (FTIR), X-ray diffraction, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). A comparative study of transport mechanism across such a Membrane and a supported liquid Membrane (SLM) containing the same carrier has been made.

M F Paugam - One of the best experts on this subject based on the ideXlab platform.

Durk F Zandstra - One of the best experts on this subject based on the ideXlab platform.

  • nadroparin versus dalteparin anticoagulation in high volume continuous venovenous hemofiltration a double blind randomized crossover study
    Critical Care Medicine, 2000
    Co-Authors: Anne Cornelie J M De Pont, Heleen Oudemansvan M Straaten, Klaas J Roozendaal, Durk F Zandstra
    Abstract:

    Objectives: To compare filter survival times during high-volume, continuous venovenous hemofiltration in patients with normal coagulation variables, using anti-factor Xa bioequivalent doses of nadroparin and dalteparin. To evaluate which other factors influence filter survival time. Design: Randomized, prospective, double-blind, crossover study. Setting: An 18-bed intensive care unit in a 530-bed teaching hospital. Patients: Thirty- two critically ill patients with renal failure, treated with high-volume, continuous venovenous hemofiltration. Interventions: High-volume, postdilutional continuous venovenous hemofiltration, with a standard blood flow rate of 200 mL/min and an ultrafiltrate volume of 100 L in 24 hrs, was performed with a highly permeable, large-surface Cellulose Triacetate Membrane. Anticoagulation with anti-Xa bioequivalent doses of nadroparin and dalteparin was administered in the extracorporeal line before the filter. Blood was sampled for determination of coagulation variables before hemofiltration, 0.5, 2, 4, 6, and 12 hrs after starting the treatment, and at the end of the hemofiltration run. Measurements and Main Results: Anti-Xa peak activity, time of anti-Xa peak activity, area under the curve for 0-3 hrs and filter survival time were not significantly different using nadroparin or dalteparin. When analyzing the patients according to the length of filter survival time, no relationship among anti-Xa peak activity, area under the curve for 0-3 hrs, and filter survival time was found. However, there was a strong trend toward a negative correlation between baseline platelet count and filter survival time (r2 = .11; p = .07). Mean blood urea nitrogen decreased from 81.0 ± 31.9 to 41.1 ± 21.2 mg/dL (p < .01) and mean creatinine decreased from 3.4 ± 1.8 to 1.9 ± 1.2 mg/dL (p < .01). There were no clinically important bleeding complications. Conclusions: Nadroparin and dalteparin are bioequivalent with respect to their anti-Xa activities. Using either drug, we did not find a difference in filter survival time during high-volume, continuous venovenous hemofiltration. No relationship between anti-Xa activity and filter survival time could be found. However, there is a strong trend toward a negative correlation between baseline platelet count and filter survival time. This suggests that during high- volume, continuous venovenous hemofiltration, patients with a higher baseline platelet count might need a different anticoagulation regimen to obtain longer filter survival times.