The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Manuel Mota - One of the best experts on this subject based on the ideXlab platform.
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Effects of lipids and Oleic Acid on biomass development in anaerobic fixed-bed reactors. Part II: Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, J. A. Mota Vieira, R. M. Alvares Pereira, M A Pereira, Manuel MotaAbstract:Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC50=137 mg/l) compared with the sludge fed with a non-fat substrate (IC50=80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH(4(STP))/gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH(4(STP))/gVS.day. This suggests the possibility of using adsorption-degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration. Copyright (C) 2000 Elsevier Science Ltd.
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effects of lipids and Oleic Acid on biomass development in anaerobic fixed bed reactors part ii Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, M A Pereira, J Mota A Vieira, R Alvares M Pereira, Manuel MotaAbstract:Abstract Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC 50 =137 mg/l) compared with the sludge fed with a non-fat substrate (IC 50 =80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH 4(STP) /gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH 4(STP) /gVS.day. This suggests the possibility of using adsorption–degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration.
M. M. Alves - One of the best experts on this subject based on the ideXlab platform.
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Effects of lipids and Oleic Acid on biomass development in anaerobic fixed-bed reactors. Part II: Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, J. A. Mota Vieira, R. M. Alvares Pereira, M A Pereira, Manuel MotaAbstract:Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC50=137 mg/l) compared with the sludge fed with a non-fat substrate (IC50=80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH(4(STP))/gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH(4(STP))/gVS.day. This suggests the possibility of using adsorption-degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration. Copyright (C) 2000 Elsevier Science Ltd.
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effects of lipids and Oleic Acid on biomass development in anaerobic fixed bed reactors part ii Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, M A Pereira, J Mota A Vieira, R Alvares M Pereira, Manuel MotaAbstract:Abstract Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC 50 =137 mg/l) compared with the sludge fed with a non-fat substrate (IC 50 =80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH 4(STP) /gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH 4(STP) /gVS.day. This suggests the possibility of using adsorption–degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration.
M A Pereira - One of the best experts on this subject based on the ideXlab platform.
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Effects of lipids and Oleic Acid on biomass development in anaerobic fixed-bed reactors. Part II: Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, J. A. Mota Vieira, R. M. Alvares Pereira, M A Pereira, Manuel MotaAbstract:Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC50=137 mg/l) compared with the sludge fed with a non-fat substrate (IC50=80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH(4(STP))/gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH(4(STP))/gVS.day. This suggests the possibility of using adsorption-degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration. Copyright (C) 2000 Elsevier Science Ltd.
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effects of lipids and Oleic Acid on biomass development in anaerobic fixed bed reactors part ii Oleic Acid toxicity and biodegradability
Water Research, 2001Co-Authors: M. M. Alves, M A Pereira, J Mota A Vieira, R Alvares M Pereira, Manuel MotaAbstract:Abstract Oleic Acid toxicity and biodegradability were followed during long-term operation of two similar anaerobic fixed-bed units. When treating an oleate based effluent, the sludge from the bioreactor that was acclimated with lipids during the first operation period, showed a higher tolerance to Oleic Acid toxicity (IC 50 =137 mg/l) compared with the sludge fed with a non-fat substrate (IC 50 =80 mg/l). This sludge showed also the highest biodegradation capacity of Oleic Acid, achieving maximum methane production rates between 33 and 46 mlCH 4(STP) /gVS.day and maximum percentages of methanization between 85 and 98% for the range of concentrations between 500 and 900 mg oleate/l. When oleate was the sole carbon source fed to both digesters, the biomass became encapsulated with organic matter, possibly oleate or an intermediate of its degradation, e.g. stearate that was degraded at a maximum rate of 99 mlCH 4(STP) /gVS.day. This suggests the possibility of using adsorption–degradation cycles for the treatment of LCFA based effluents. Both tolerance to toxicity and biodegradability of Oleic Acid were improved by acclimatization with lipids or oleate below a threshold concentration.
Thomas C Jenkins - One of the best experts on this subject based on the ideXlab platform.
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microbial biohydrogenation of Oleic Acid to trans isomers in vitro
Journal of Lipid Research, 2002Co-Authors: Erin Mosley, Gary L Powell, Melissa B Riley, Thomas C JenkinsAbstract:Ruminant products are significant sources of di- etary trans fatty Acids. Trans fatty Acids, including various conjugated linOleic Acid isomers, have been shown to act as metabolic modifiers of lipid metabolism. Trans fatty Acids originate from biohydrogenation of dietary unsaturated fatty Acids by gut microbes; however, the exact synthetic pathways are unclear. It was our goal to examine the biohy- drogenation pathway for Oleic Acid, where Oleic Acid is hy- drogenated directly to stearic Acid. Our objective in this study was to trace the time course of appearance of 13 C in labeled Oleic Acid to determine if trans monoenes are formed from the 13 C-labeled Oleic Acid or if the 13 C appears only in stearic Acid as described in reviews of earlier work. Enrichments were calculated from the mass abundance of 13 C in major fatty Acid fragments and expressed as a per- centage of total carbon isotopomers. Significant 13 C enrich- ment was found in stearic Acid, Oleic Acid, trans -6, trans -7, and in all trans C18:1 in positions 9-16. We concluded that the biohydrogenation of Oleic Acid by mixed ruminal microbes involves the formation of several positional iso- mers of trans monoenes rather than only direct biohydroge- nation to form stearic Acid as previously described. — Mosley, E. E., G. L. Powell, M. B. Riley, and T. C. Jenkins. Mi- crobial biohydrogenation of Oleic Acid to trans isomers in vitro. J. Lipid Res. 2002. 43: 290-296.
G Karlsson - One of the best experts on this subject based on the ideXlab platform.
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aggregate structure in dilute aqueous dispersions of Oleic Acid sodium oleate and Oleic Acid sodium oleate egg phosphatidylcholine
Langmuir, 1995Co-Authors: Katarina Edwards, Mats Silvander, G KarlssonAbstract:Cryo-transmission electron microscopy was used to investigate the aggregate structure in dilute aqueous samples of Oleic Acid, as a function of pH. At pH 10.7, where the fatty Acid is almost completely deprotonated, the micrographs show spherical or cylindrical micelles depending on the concentration. Upon a decrease of the pH to values just above 9, formation of unilamellar vesicles is induced. With decreasing pH the vesicles show an increasing tendency to aggregate. At pH between 8 and 7, large clusters of aggregated vesicles coexist with dispersed nonlamellar, presumably inverted hexagonal structures. Further decrease in pH results in a complete transition into nonlamellar liquid-crystalline structures and finally to the formation of oil droplets. Addition of high concentrations of Oleic Acid to small unilamellar lecithin vesicles induces, at pH 7.4 and lower, clustering and formation of particles with nonlamellar structure. At high pH, on the other hand, Oleic Acid acts like a conventional cationic surfactant. With increasing fatty Acid: lipid molar ratio both significant vesicle growth and finally lipid solubilization into mixed micelles are observed.
