The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Julian Lebrato - One of the best experts on this subject based on the ideXlab platform.
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Anaerobic degradation of Polyethylene Glycol mixtures
Journal of Chemical Technology and Biotechnology, 2003Co-Authors: Emilia Otal, Julian LebratoAbstract:Anaerobic treatment of Polyethylene Glycol may represent an alternative to integrated chemical-biological treatment for the elimination of Polyethylene Glycol. Anaerobic biodegradation of synthetic waters are made with a mix of Polyethylene Glycol of molecular weights 400, 600 and 1000 and another made with Polyethylene Glycol of molecular weights 1500, 3000 and 10 000, was studied using an inoculum adapted to Polyethylene Glycol 10 000. The critical and minimum retention times were estimated and ranged from 13.2 to 14 and from 18 to 20 days, respectively. Under these operational conditions, the removal percentage ranged from 85 to 90%. Thus, anaerobic degradation of synthetic water containing Polyethylene Glycol produces removal percentages and hydraulic retention times similar to those of biodegradable wastewater tested at the same operational conditions. (C) 2003 Society of Chemical Industry.
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Anaerobic treatment of Polyethylene Glycol of different molecular weights.
Environmental Technology, 2002Co-Authors: Emilia Otal, Julian LebratoAbstract:Biodegradation of high molecular weight Polyethylene Glycol has been found difficult under aerobic conditions. The use of a chemical treatment prior to the aerobic one was necessary to remove high molecular weight of Polyethylene Glycol. Anaerobic treatment of Polyethylene Glycol may present an alternative to integrated chemical and biological treatment for the elimination of this compound. Anaerobic biodegradation of Polyethylene Glycol from 200 to 10000 molecular weight was studied. It showed that, unlike aerobic treatment, the size of the molecule up to 10000 does not affect the process efficiency. The critical retention time and the optimum retention time were estimated and ranged from 10 to 14 and from 16 to 19 days, respectively. Under these operational conditions percentage of removal ranged from 85 to 90%. Thus, anaerobic degradation of Polyethylene Glycol presents removal percentages and hydraulic retention times similar to those of biodegradable compounds tested at the same operational conditions.
Emilia Otal - One of the best experts on this subject based on the ideXlab platform.
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Anaerobic degradation of Polyethylene Glycol mixtures
Journal of Chemical Technology and Biotechnology, 2003Co-Authors: Emilia Otal, Julian LebratoAbstract:Anaerobic treatment of Polyethylene Glycol may represent an alternative to integrated chemical-biological treatment for the elimination of Polyethylene Glycol. Anaerobic biodegradation of synthetic waters are made with a mix of Polyethylene Glycol of molecular weights 400, 600 and 1000 and another made with Polyethylene Glycol of molecular weights 1500, 3000 and 10 000, was studied using an inoculum adapted to Polyethylene Glycol 10 000. The critical and minimum retention times were estimated and ranged from 13.2 to 14 and from 18 to 20 days, respectively. Under these operational conditions, the removal percentage ranged from 85 to 90%. Thus, anaerobic degradation of synthetic water containing Polyethylene Glycol produces removal percentages and hydraulic retention times similar to those of biodegradable wastewater tested at the same operational conditions. (C) 2003 Society of Chemical Industry.
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Anaerobic treatment of Polyethylene Glycol of different molecular weights.
Environmental Technology, 2002Co-Authors: Emilia Otal, Julian LebratoAbstract:Biodegradation of high molecular weight Polyethylene Glycol has been found difficult under aerobic conditions. The use of a chemical treatment prior to the aerobic one was necessary to remove high molecular weight of Polyethylene Glycol. Anaerobic treatment of Polyethylene Glycol may present an alternative to integrated chemical and biological treatment for the elimination of this compound. Anaerobic biodegradation of Polyethylene Glycol from 200 to 10000 molecular weight was studied. It showed that, unlike aerobic treatment, the size of the molecule up to 10000 does not affect the process efficiency. The critical retention time and the optimum retention time were estimated and ranged from 10 to 14 and from 16 to 19 days, respectively. Under these operational conditions percentage of removal ranged from 85 to 90%. Thus, anaerobic degradation of Polyethylene Glycol presents removal percentages and hydraulic retention times similar to those of biodegradable compounds tested at the same operational conditions.
Jens Glastrup - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of Polyethylene Glycol ( Peg ) on Heating
ICOM-CC (International Council of Museums - Conservation Committee) Conference, 1990Co-Authors: Tim Padfield, W B Pedersen, J. Winslow, Jens GlastrupAbstract:During conservation of a wooden boat, surplus Polyethylene Glycol (PEG) was melted away. On cooling, the PEG divided itself into three distinct phases: solid, pasty and liquid. These fractions resulted from a rapid oxidative degradation of PEG in warm air. Dry Polyethylene Glycol degrades significantly within four hours when heated to 75C. Water protects against degradation, which is perhaps why the phenomenon has not been described before in the conservation literature.
Tim Padfield - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of Polyethylene Glycol ( Peg ) on Heating
ICOM-CC (International Council of Museums - Conservation Committee) Conference, 1990Co-Authors: Tim Padfield, W B Pedersen, J. Winslow, Jens GlastrupAbstract:During conservation of a wooden boat, surplus Polyethylene Glycol (PEG) was melted away. On cooling, the PEG divided itself into three distinct phases: solid, pasty and liquid. These fractions resulted from a rapid oxidative degradation of PEG in warm air. Dry Polyethylene Glycol degrades significantly within four hours when heated to 75C. Water protects against degradation, which is perhaps why the phenomenon has not been described before in the conservation literature.
Marc Halphen - One of the best experts on this subject based on the ideXlab platform.
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a low volume Polyethylene Glycol plus ascorbate solution for bowel cleansing prior to colonoscopy the normo randomised clinical trial
Digestive and Liver Disease, 2013Co-Authors: Thierry Ponchon, C Boustiere, Denis Heresbach, H Hagege, Annelaure Tarrerias, Marc HalphenAbstract:Abstract Background Patient acceptability of the preparation is a key factor in the success of colonoscopy, yet standard Polyethylene Glycol solutions are poorly tolerated owing to their high volume (4 L) and low palatability. This study compared the efficacy, safety and acceptability of a 2 L Polyethylene Glycol + ascorbate solution with a standard 4-L Polyethylene Glycol solution. Methods Adults referred for colonoscopy were randomised to 2-L Polyethylene Glycol + ascorbate (n = 202) or 4-L Polyethylene Glycol solution (n = 198). Colon cleansing success was assessed using the Harefield Cleansing Scale© and the Aronchick scale. Safety and acceptability were also assessed. Results Successful cleansing was achieved in 94.1% and 90.9% of subjects with the 2-L and 4-L solutions respectively using the Harefield Cleansing Scale© and 94.6% and 90.0% using the Aronchick scale (non significant). Despite better acceptability and tolerability, no superiority over the standard 4-L preparation was demonstrated. Fewer treatment-related adverse events were reported with the 2-L solution (80.2% versus 89.9%, p = 0.011). More subjects were willing to take the 2 L PEG + ascorbate solution again (87% versus 51%, p Conclusions Two-litre Polyethylene Glycol + ascorbate solution, with a similar high degree of cleansing and superior acceptability and tolerability, presents an alternative to 4-L Polyethylene Glycol when compliance is an issue.