The Experts below are selected from a list of 11673 Experts worldwide ranked by ideXlab platform
Masaaki Hosomi - One of the best experts on this subject based on the ideXlab platform.
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biodegradation of natural and synthetic estrogens by nitrifying activated sludge and ammonia oxidizing bacterium nitrosomonas europaea
Water Research, 2004Co-Authors: Saori Fujisawa, Satoshi Nakai, Masaaki HosomiAbstract:Abstract This report describes the uses of nitrifying activated sludge (NAS) and ammonia-oxidizing bacterium Nitrosomonas europaea to significantly degrade estrone (E1), 17β-estradiol (E2), estriol (E3), and 17α-ethynylestradiol (EE2). Using NAS, the degradation of estrogens obeyed first-Order Reaction kinetics with degradation rate constants of 0.056 h −1 for E1, 1.3 h −1 for E2, 0.030 h −1 for E3, and 0.035 h −1 for EE2, indicating that E2 was most easily degraded. Then, we confirmed that E2 was degraded via E1 by NAS. With/without the ammonia oxidation inhibitor, it was observed that ammonia-oxidizing bacteria in conjunction with other microorganisms in NAS degraded estrogens. Using N. europaea , the degradation of estrogens reasonably obeyed Zero-Order Reaction kinetics, and no remarkable difference is present among the four estrogens degradation rates and it was found that E1 was not detected during E2 degradation period. We suggested that E2 was degraded to E1 in NAS could be caused by other heterotrophic bacteria, not by ammonia-oxidizing bacteria.
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Biodegradation of natural and synthetic estrogens by nitrifying activated sludge and ammonia-oxidizing bacterium Nitrosomonas europaea
Water Research, 2004Co-Authors: Jianghong Shi, Saori Fujisawa, Satoshi Nakai, Masaaki HosomiAbstract:This report describes the uses of nitrifying activated sludge (NAS) and ammonia-oxidizing bacterium Nitrosomonas europaea to significantly degrade estrone (E1), 17beta-estradiol (E2), estriol (E3), and 17alpha-ethynylestradiol (EE2). Using NAS, the degradation of estrogens obeyed first-Order Reaction kinetics with degradation rate constants of 0.056 h(-1) for E1, 1.3 h(-1) for E2, 0.030 h(-1) for E3, and 0.035 h(-1) for EE2, indicating that E2 was most easily degraded. Then, we confirmed that E2 was degraded via E1 by NAS. With/without the ammonia oxidation inhibitor, it was observed that ammonia-oxidizing bacteria in conjunction with other microorganisms in NAS degraded estrogens. Using N. europaea, the degradation of estrogens reasonably obeyed Zero-Order Reaction kinetics, and no remarkable difference is present among the four estrogens degradation rates and it was found that E1 was not detected during E2 degradation period. We suggested that E2 was degraded to E1 in NAS could be caused by other heterotrophic bacteria, not by ammonia-oxidizing bacteria.
Shourong Zhu - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, Spectra, and Electron-Transfer Reaction of Aspartic Acid-Functionalized Water-Soluble Perylene Bisimide in Aqueous Solution
2016Co-Authors: Lina Zhong, Feifei Xing, Wei Shi, Liuming Yan, Liqing Xie, Shourong ZhuAbstract:An aspartic acid-functionalized water-soluble perylene bisimide, N,N′-di(2-succinic acid)-perylene-3,4,9,10-tetracarboxylic bisimide (PASP) was synthesized and characterized. It has absorbance maximum A0–0 and A0–1 at 527 and 498 nm (ε ≈ 1.7 × 104 L cm–1 mol–1) respectively in pH 7.20 HEPES buffer. Two quasi-reversible redox processes with E1/2 at −0.17 and −0.71 V (vs Ag/AgCl) respectively in pH 7–12.5 aqueous solutions. PASP can react with Na2S in pure aqueous solution to form monoanion radical and dianion species consecutively. PASP–• has EPR signal with g = 1.998 in aqueous solution, whereas PASP2‑ is EPR silent. The monoanion radical formation is a first-Order Reaction with k = 8.9 × 10–2 s–1. Dianion species formation is a Zero-Order Reaction and the rate constant is 4.3 × 10–8 mol L–1 s–1. The presence of H2O2 greatly increases the radical formation rate constant. PASP as a two-electron transfer reagent is expected to be used in the water photolysis
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synthesis spectra and electron transfer Reaction of aspartic acid functionalized water soluble perylene bisimide in aqueous solution
ACS Applied Materials & Interfaces, 2013Co-Authors: Lina Zhong, Feifei Xing, Wei Shi, Liuming Yan, Liqing Xie, Shourong ZhuAbstract:An aspartic acid-functionalized water-soluble perylene bisimide, N,N′-di(2-succinic acid)-perylene-3,4,9,10-tetracarboxylic bisimide (PASP) was synthesized and characterized. It has absorbance maximum A0–0 and A0–1 at 527 and 498 nm (e ≈ 1.7 × 104 L cm–1 mol–1) respectively in pH 7.20 HEPES buffer. Two quasi-reversible redox processes with E1/2 at −0.17 and −0.71 V (vs Ag/AgCl) respectively in pH 7–12.5 aqueous solutions. PASP can react with Na2S in pure aqueous solution to form monoanion radical and dianion species consecutively. PASP–• has EPR signal with g = 1.998 in aqueous solution, whereas PASP2- is EPR silent. The monoanion radical formation is a first-Order Reaction with k = 8.9 × 10–2 s–1. Dianion species formation is a Zero-Order Reaction and the rate constant is 4.3 × 10–8 mol L–1 s–1. The presence of H2O2 greatly increases the radical formation rate constant. PASP as a two-electron transfer reagent is expected to be used in the water photolysis.
Marija Vukovic - One of the best experts on this subject based on the ideXlab platform.
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high nitrate removal from synthetic wastewater with the mixed bacterial culture
Bioresource Technology, 2005Co-Authors: Lucija Foglar, Felicita Briski, Laszlo Sipos, Marija VukovicAbstract:Abstract The applicability of the mixed bacterial culture, originated from two-stage anaerobic–aerobic industrial yeasts production wastewater treatment plant for high rate denitrification processes was investigated. After acclimation to nitrate, the dominant strains were Pseudomonas and Paracoccus sp. Complete denitrification with low accumulation of nitrite-N (0.1 mg/l) was found in synthetic wastewater, obeying a Zero-Order Reaction with respect to nitrate and a first-Order Reaction with respect to biomass concentration. Denitrification was then monitored in the continuous-flow stirred reactor at different hydraulic retention time, HRT (62–28 h) in Order to achieve the optimal HRT. Nitrate was completely removed during following 45 days, at 25 °C with HRT, which we reduced from 62 to 28 h. Yet still, at 28 h HRT, high average specific denitrification rate of 142 mg NO 3 - - N / g VSS h was obtained.
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high nitrate removal from synthetic wastewater with the mixed bacterial culture
Bioresource Technology, 2005Co-Authors: Lucija Foglar, Felicita Briski, Laszlo Sipos, Marija VukovicAbstract:The applicability of the mixed bacterial culture, originated from two-stage anaerobic-aerobic industrial yeasts production wastewater treatment plant for high rate denitrification processes was investigated. After acclimation to nitrate, the dominant strains were Pseudomonas and Paracoccus sp. Complete denitrification with low accumulation of nitrite-N (0.1 mg/l) was found in synthetic wastewater, obeying a Zero-Order Reaction with respect to nitrate and a first-Order Reaction with respect to biomass concentration. Denitrification was then monitored in the continuous-flow stirred reactor at different hydraulic retention time, HRT (62-28 h) in Order to achieve the optimal HRT. Nitrate was completely removed during following 45 days, at 25 degrees C with HRT, which we reduced from 62 to 28 h. Yet still, at 28 h HRT, high average specific denitrification rate of 142 mg NO3- -N/g VSS h was obtained.
Saori Fujisawa - One of the best experts on this subject based on the ideXlab platform.
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biodegradation of natural and synthetic estrogens by nitrifying activated sludge and ammonia oxidizing bacterium nitrosomonas europaea
Water Research, 2004Co-Authors: Saori Fujisawa, Satoshi Nakai, Masaaki HosomiAbstract:Abstract This report describes the uses of nitrifying activated sludge (NAS) and ammonia-oxidizing bacterium Nitrosomonas europaea to significantly degrade estrone (E1), 17β-estradiol (E2), estriol (E3), and 17α-ethynylestradiol (EE2). Using NAS, the degradation of estrogens obeyed first-Order Reaction kinetics with degradation rate constants of 0.056 h −1 for E1, 1.3 h −1 for E2, 0.030 h −1 for E3, and 0.035 h −1 for EE2, indicating that E2 was most easily degraded. Then, we confirmed that E2 was degraded via E1 by NAS. With/without the ammonia oxidation inhibitor, it was observed that ammonia-oxidizing bacteria in conjunction with other microorganisms in NAS degraded estrogens. Using N. europaea , the degradation of estrogens reasonably obeyed Zero-Order Reaction kinetics, and no remarkable difference is present among the four estrogens degradation rates and it was found that E1 was not detected during E2 degradation period. We suggested that E2 was degraded to E1 in NAS could be caused by other heterotrophic bacteria, not by ammonia-oxidizing bacteria.
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Biodegradation of natural and synthetic estrogens by nitrifying activated sludge and ammonia-oxidizing bacterium Nitrosomonas europaea
Water Research, 2004Co-Authors: Jianghong Shi, Saori Fujisawa, Satoshi Nakai, Masaaki HosomiAbstract:This report describes the uses of nitrifying activated sludge (NAS) and ammonia-oxidizing bacterium Nitrosomonas europaea to significantly degrade estrone (E1), 17beta-estradiol (E2), estriol (E3), and 17alpha-ethynylestradiol (EE2). Using NAS, the degradation of estrogens obeyed first-Order Reaction kinetics with degradation rate constants of 0.056 h(-1) for E1, 1.3 h(-1) for E2, 0.030 h(-1) for E3, and 0.035 h(-1) for EE2, indicating that E2 was most easily degraded. Then, we confirmed that E2 was degraded via E1 by NAS. With/without the ammonia oxidation inhibitor, it was observed that ammonia-oxidizing bacteria in conjunction with other microorganisms in NAS degraded estrogens. Using N. europaea, the degradation of estrogens reasonably obeyed Zero-Order Reaction kinetics, and no remarkable difference is present among the four estrogens degradation rates and it was found that E1 was not detected during E2 degradation period. We suggested that E2 was degraded to E1 in NAS could be caused by other heterotrophic bacteria, not by ammonia-oxidizing bacteria.
Gulam Rusul - One of the best experts on this subject based on the ideXlab platform.
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storage stability of jackfruit artocarpus heterophyllus powder packaged in aluminium laminated polyethylene and metallized co extruded biaxially oriented polypropylene during storage
Journal of Food Engineering, 2008Co-Authors: Sheikh Abd N Hamid, Abd R Rahman, Hamed Mirhosseini, Gulam RusulAbstract:Total colour difference (ΔE), rates of adsorbed moisture and sensory attributes of drum-dried jackfruit powder packaged in aluminium laminated polyethylene (ALP) and metallized co-extruded biaxially oriented polypropylene (BOPP/MCPP) pouches stored at accelerated storage (38 °C, with 50%, 75% and 90% relative humidity (RH)) were determined over 12 weeks period. The changes in total colour followed Zero Order Reaction kinetics. Packaging materials, storage temperature and RH values significantly (p < 0.05) influenced the rates of adsorbed moisture of jackfruit powder. There was a significant (p < 0.05) decrease in the intensities of the fruity odour, taste and increase in the lumpiness of the jackfruit powder stored at 38 °C with 90% RH. The shelf life of jackfruit powder stored at 38 °C and 90% RH was limited by overall acceptability and the intensity of fruity odour, taste and lumpiness at week 8 of storage. Jackfruit powder stored at 28 °C remained stable and acceptable throughout the storage period for all RH values. The powder packaged in ALP significantly (p < 0.05) reduced total colour change, rates of adsorbed moisture, lumpiness intensity of jackfruit powder and was rated higher in terms of overall acceptability over BOPP/MCPP. Results of this study suggested that ALP packaging with storage conditions of 28 °C and RH less than 75% was better suited for keeping jackfruit powder.
