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Archiv Fur Mikrobiologie 1959
Topics: Aerobiosis; Gram-Negative Bacteria; Hemeproteins; Pigments, Biological; Rhodopseudomonas; Rhodospirillum
PubMed: 13810591
DOI: 10.1007/BF00409800 -
Journal of Applied Physiology... Aug 1993A model of cycling performance is presented. The model is based on equating two expressions for the total amount of work performed. One expression is deduced from...
A model of cycling performance is presented. The model is based on equating two expressions for the total amount of work performed. One expression is deduced from biomechanical principles deriving energy requirements from total resistance. The other models the energy available from aerobic and anaerobic energy systems, including the effect of oxygen uptake kinetics at the onset of exercise. The equation can then be solved for any of the variables. Empirically derived field and laboratory data were used to assess the accuracy of the model. Model estimates of 4,000-m individual pursuit performance times showed a correlation of 0.803 (P < or = 0.0001) with times measured in 18 high-performance track cyclists, with a mean difference (predicted--measured) of 4.6 s (1.3% of mean performance time). The model enables estimates of the performance impact of alterations in physiological, biomechanical, anthropometric, and environmental parameters.
Topics: Aerobiosis; Anaerobiosis; Bicycling; Biomechanical Phenomena; Body Surface Area; Energy Metabolism; Humans; Models, Biological; Oxygen Consumption
PubMed: 8226476
DOI: 10.1152/jappl.1993.75.2.730 -
Annals of the New York Academy of... Oct 1992
Review
Topics: Aerobiosis; Biodegradation, Environmental; Sanitary Engineering; Soil Pollutants
PubMed: 1416619
DOI: 10.1111/j.1749-6632.1992.tb42603.x -
Australian Family Physician Jun 1984
Topics: Aerobiosis; Humans; Methods; Physical Exertion; Time Factors
PubMed: 6487166
DOI: No ID Found -
JAMA Apr 1986
Topics: Aerobiosis; Blood Pressure; Humans; Hypertension; Physical Exertion
PubMed: 3951107
DOI: No ID Found -
Bacteriologia, Virusologia,... 1995
Review
Topics: Aerobiosis; Anaerobiosis; Bacteria; Energy Metabolism; Oxygen
PubMed: 7579953
DOI: No ID Found -
Water Research Nov 2020The settling behavior of aerobic granular sludge (AGS) in full-scale reactors is different from the settling of normal activated sludge. Current activated sludge models...
The settling behavior of aerobic granular sludge (AGS) in full-scale reactors is different from the settling of normal activated sludge. Current activated sludge models lack the features to describe the segregation of granules based on size during the settling process. This segregation plays an important role in the granulation process and therefore a better understanding of the settling is essential. The goal of this study was to model and evaluate the segregation of different granule sizes during settling and feeding in full-scale aerobic granular sludge reactors. Hereto the Patwardhan and Tien model was used. This model is an implementation of the Richardson and Zaki model, allowing for multiple classes of particles. To create the granular settling model, the most relevant parameters were identified using aerobic granular sludge from different full-scale Nereda® reactors. The settling properties of individual granules were measured as was the bulk behavior of granular sludge beds with uniform granular sludge particles. The obtained parameters were combined in a model containing multiple granule classes, which then was validated for granular sludge settling in a full-scale Nereda® reactor. In practice a hydraulic selection pressure is used to select for granular sludge. Under the same hydraulic selection pressure the model predicted that different stable granular size distributions can occur. This indicates that granular size distribution control would need a different mechanism then the hydraulic selection pressure alone. This model can be used to better understand and optimize operational parameters of AGS reactors that depend on granular sludge size, like biological nutrient removal. Furthermore insights from this model can also be used in the development of continuously fed AGS systems.
Topics: Aerobiosis; Bioreactors; Sewage; Waste Disposal, Fluid
PubMed: 32891906
DOI: 10.1016/j.watres.2020.116135 -
Environmental Technology May 2020For a stable operation, the aerobic granular sludge process requires mechanically strong granules in balance with the shear forces in the reactor. Despite a wide general...
For a stable operation, the aerobic granular sludge process requires mechanically strong granules in balance with the shear forces in the reactor. Despite a wide general interest in granular stability, the mechanical strength of both anaerobic and aerobic granular sludge received very little attention. In this study, a high-shear method for strength characterization has been evaluated for full-scale aerobic granular sludge (AGS). Abrasion times up to 90 min showed a stable abrasion rate coefficient (), while prolonged periods of abrasion up to 24 h resulted in a decrease in abrasion rate. Larger granules have higher abrasion rate than smaller granules. No abrasion was observed at low shear rates, indicating a threshold shear rate for abrasion. Lab-scale AGS showed a lower abrasion rate than full-scale AGS. Incubation of full-scale granules in NaCl led to a decrease in abrasion rate at 25 g L NaCl, but incubation in 50 g L NaCl led to a further decrease for only half of the tested granular sludge samples.
Topics: Aerobiosis; Bioreactors; Sewage; Waste Disposal, Fluid
PubMed: 30380999
DOI: 10.1080/09593330.2018.1543357 -
Journal - Water Pollution Control... Jun 1975
Review
Topics: Aerobiosis; Agriculture; Anaerobiosis; Animals; Diptera; Food Supply; Industrial Waste; Odorants
PubMed: 1099244
DOI: No ID Found -
Biotechnology and Bioengineering Feb 2023Floccules are another major form of microbial aggregates in aerobic granular sludge systems. Previous studies mainly attributed the persistence of floccules to their...
Floccules are another major form of microbial aggregates in aerobic granular sludge systems. Previous studies mainly attributed the persistence of floccules to their relatively faster nutrient uptake and higher growth rate over aerobic granules; however, they failed to unravel the underlying mechanism of the long-term coexistence of these two aggregates. In this work, the existence and function of the floccules in an aerobic granule-dominated sequencing batch reactor were investigated from the view of quorum sensing (QS) and quorum quenching (QQ). The results showed that though the floccules were closely associated with the granules in terms of similar community structures (including the QS- and QQ-related ones), they exhibited a relatively higher QQ-related activity but a lower QS-related activity. A compatible proportion of floccules might be helpful to maintain the QS-related activity and keep the granules stable. In addition, the structure difference was demonstrated to diversify the QS- and QQ-related activities of the floccules and the aerobic granules. These findings could broaden our understanding of the interactions between the coexistent floccules and granules in aerobic granule-dominated systems and would be instructive for the development of the aerobic granular sludge process.
Topics: Quorum Sensing; Sewage; Bioreactors; Biological Transport; Aerobiosis
PubMed: 36303067
DOI: 10.1002/bit.28275