The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Hélene Edling - One of the best experts on this subject based on the ideXlab platform.
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Influence of light on bacterioplankton in a tropical lake
Hydrobiologia, 1996Co-Authors: Måns Lindell, Hélene EdlingAbstract:Bacterial abundance and production in a vertical profile in Lake Kariba (17dgS), Zimbabwe, were affected by solar irradiance. At the surface, 1.87 × 10^9 bacteria 1^−1 were found and abundance peaked at 10 m (2.5 × 10^9 bacteria l^-1), then decreasing with depth. Bacterial Reproduction at the surface(0.145 µg C1^−1 h^−1) was nearly four times less than the production at 10 m although Bacterial numbers were only 26% less. Thus, Bacterial production per cell was lower at the surface than deeper down, suggesting that Bacterial production is inhibited at the surface. Bacterial production in GF/F filtered lake water in Whirl Pack™ bags showed an exponential decrease down to 3 m depth. The inhibition was well in accordance with light extinction in the UV region. Phosphatase activity was low in light exposed bags compared to dark, indicating photolysis of extracellular enzymes, or phototransformation of recalcitrant DOM, which substitutes enzyme activity. Hypolimnetic enzyme activity was less affected by solar light than epilimnetic.
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Influence of light on bacterioplankton in a tropical lake
Hydrobiologia, 1996Co-Authors: Måns Lindell, Hélene EdlingAbstract:Bacterial abundance and production in a vertical profile in Lake Kariba (17dgS), Zimbabwe, were affected by solar irradiance. At the surface, 1.87 × 109 bacteria 1−1 were found and abundance peaked at 10 m (2.5 × 109 bacteria l-1), then decreasing with depth. Bacterial Reproduction at the surface(0.145 µg C1−1 h−1) was nearly four times less than the production at 10 m although Bacterial numbers were only 26% less. Thus, Bacterial production per cell was lower at the surface than deeper down, suggesting that Bacterial production is inhibited at the surface.
Ma Tao - One of the best experts on this subject based on the ideXlab platform.
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Compatibility between weak gel and microorganisms in weak gel-assisted microbial enhanced oil recovery
Journal of bioscience and bioengineering, 2018Co-Authors: Cheng-gang Zheng, Zengmin Lun, Ma TaoAbstract:To investigate weak gel-assisted microbial flooding in Block Wang Long Zhuang in the Jiangsu Oilfield, the compatibility of weak gel and microbe was evaluated using laboratory experiments. Bacillus sp. W5 was isolated from the formation water in Block Wang Long Zhuang. The rate of oil degradation reached 178 mg/day, and the rate of viscosity reduction reached 75.3%. Strain W5 could produce lipopeptide with a yield of 1254 mg/L. Emulsified crude oil was dispersed in the microbial degradation system, and the average diameter of the emulsified oil particles was 18.54 μm. Bacillus sp. W5 did not affect the rheological properties of the weak gel, and the presence of the weak gel did not significantly affect Bacterial Reproduction (as indicated by an unchanged microbial biomass), emulsification (surface tension is 35.56 mN/m and average oil particles size is 21.38 μm), oil degradation (162 mg/day) and oil viscosity reduction (72.7%). Core-flooding experiments indicated oil recovery of 23.6% when both weak gel and Bacillus sp. W5 were injected into the system, 14.76% when only the weak gel was injected, and 9.78% with strain W5 was injected without the weak gel. The results demonstrate good compatibility between strains W5 and the weak gel and highlight the application potential of weak gel-assisted microbial flooding.
Måns Lindell - One of the best experts on this subject based on the ideXlab platform.
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Influence of light on bacterioplankton in a tropical lake
Hydrobiologia, 1996Co-Authors: Måns Lindell, Hélene EdlingAbstract:Bacterial abundance and production in a vertical profile in Lake Kariba (17dgS), Zimbabwe, were affected by solar irradiance. At the surface, 1.87 × 10^9 bacteria 1^−1 were found and abundance peaked at 10 m (2.5 × 10^9 bacteria l^-1), then decreasing with depth. Bacterial Reproduction at the surface(0.145 µg C1^−1 h^−1) was nearly four times less than the production at 10 m although Bacterial numbers were only 26% less. Thus, Bacterial production per cell was lower at the surface than deeper down, suggesting that Bacterial production is inhibited at the surface. Bacterial production in GF/F filtered lake water in Whirl Pack™ bags showed an exponential decrease down to 3 m depth. The inhibition was well in accordance with light extinction in the UV region. Phosphatase activity was low in light exposed bags compared to dark, indicating photolysis of extracellular enzymes, or phototransformation of recalcitrant DOM, which substitutes enzyme activity. Hypolimnetic enzyme activity was less affected by solar light than epilimnetic.
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Influence of light on bacterioplankton in a tropical lake
Hydrobiologia, 1996Co-Authors: Måns Lindell, Hélene EdlingAbstract:Bacterial abundance and production in a vertical profile in Lake Kariba (17dgS), Zimbabwe, were affected by solar irradiance. At the surface, 1.87 × 109 bacteria 1−1 were found and abundance peaked at 10 m (2.5 × 109 bacteria l-1), then decreasing with depth. Bacterial Reproduction at the surface(0.145 µg C1−1 h−1) was nearly four times less than the production at 10 m although Bacterial numbers were only 26% less. Thus, Bacterial production per cell was lower at the surface than deeper down, suggesting that Bacterial production is inhibited at the surface.
Cheng-gang Zheng - One of the best experts on this subject based on the ideXlab platform.
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Compatibility between weak gel and microorganisms in weak gel-assisted microbial enhanced oil recovery
Journal of bioscience and bioengineering, 2018Co-Authors: Cheng-gang Zheng, Zengmin Lun, Ma TaoAbstract:To investigate weak gel-assisted microbial flooding in Block Wang Long Zhuang in the Jiangsu Oilfield, the compatibility of weak gel and microbe was evaluated using laboratory experiments. Bacillus sp. W5 was isolated from the formation water in Block Wang Long Zhuang. The rate of oil degradation reached 178 mg/day, and the rate of viscosity reduction reached 75.3%. Strain W5 could produce lipopeptide with a yield of 1254 mg/L. Emulsified crude oil was dispersed in the microbial degradation system, and the average diameter of the emulsified oil particles was 18.54 μm. Bacillus sp. W5 did not affect the rheological properties of the weak gel, and the presence of the weak gel did not significantly affect Bacterial Reproduction (as indicated by an unchanged microbial biomass), emulsification (surface tension is 35.56 mN/m and average oil particles size is 21.38 μm), oil degradation (162 mg/day) and oil viscosity reduction (72.7%). Core-flooding experiments indicated oil recovery of 23.6% when both weak gel and Bacillus sp. W5 were injected into the system, 14.76% when only the weak gel was injected, and 9.78% with strain W5 was injected without the weak gel. The results demonstrate good compatibility between strains W5 and the weak gel and highlight the application potential of weak gel-assisted microbial flooding.
Elena Serrano - One of the best experts on this subject based on the ideXlab platform.
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Emerging micropollutant oxidation during disinfection processes using UV-C, UV-C/H2O2, UV-A/TiO2 and UV-A/TiO2/H2O2.
Water research, 2012Co-Authors: Cristina Pablos, Javier Marugán, Rafael Van Grieken, Elena SerranoAbstract:Regeneration of wastewater treatment plant effluents constitutes a solution to increase the availability of water resources in arid regions. Water reuse legislation imposes an exhaustive control of the microbiological quality of water in the operation of disinfection tertiary treatments. Additionally, recent reports have paid increasing attention to emerging micropollutants with potential biological effects even at trace level concentration. This work focuses on the evaluation of several photochemical technologies as disinfection processes with the aim of simultaneously achieving Bacterial inactivation and oxidation of pharmaceuticals as examples of emerging micropollutants typically present in water and widely studied in the literature. UV-C-based processes show a high efficiency to inactivate bacteria. However, the Bacterial damages are reversible and only when using H(2)O(2), Bacterial Reproduction is affected. Moreover, a complete elimination of pharmaceutical compounds was not achieved at the end of the inactivation process. In contrast, UV-A/TiO(2) required a longer irradiation time to inactivate bacteria but pharmaceuticals were completely removed along the process. In addition, its oxidation mechanism, based on hydroxyl radicals (OH), leads to irreversible Bacterial damages, not requiring of chemicals to avoid Bacterial regrowth. For UV-A/TiO(2)/H(2)O(2) process, the addition of H(2)O(2) improved Escherichia coli inactivation since the cell wall weakening, due to OH attacks, allowed H(2)O(2) to diffuse into the bacteria. However, a total elimination of the pharmaceuticals was not achieved during the inactivation process.