Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Hydrodynamic Stress"”.
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Effects of hydrodynamic stress on growing Saccharomyces cerevisiae in a slurry reactor
… understand and quantify biological responses to hydrodynamic stress by investigating the activity of the yeast Saccharomyces cerevisiae, cultivated in the presence of a range of solid loadings, solid sizes and agitation rates. The influence of inoculum size, inoculum age and type of agitator were …
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Quantifying the Sensitivity of Land-Surface Models to Hydrodynamic Stress Limitations on Transpiration
… lack of mechanistic representation of the tree-hydrodynamic process should therefore lead to typical intra-daily patterns of error in results of current models.We use a comparison between observational data and model outputs to characterize the patterns of intra-daily error in simulated water …
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The effect of particulate-induced hydrodynamic stress on the bioleaching of chalcopyrite by a Sulfolobus sp.
In slurry reactors, hydrodynamic stress originates primarily from interactions between particles and cells in the reactor. This form of stress has been shown to negatively affect the process performance. The present study centres on slurry reactors utilised in the bioleaching industry. The …
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An investigation of the effect of hydrodynamic stress on the growth, morphology and metabolism of microorganisms
… operation may require a compromise between the stress sensitivity and the mass transfer requirements of the .microbial system. In this project, the development of general predictive techniques to optimise the design and operation for stress sensitive microorganisms was sought. The effect of …
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Mechanical handling effects on brewers' yeast
… handling which exposes the cells to shear stress. It is known that biological particles are sensitive to hydrodynamic stress and the resultant biological response may be observed by a decrease growth rate (Cherry and Papoutsakis, 1988), decreased viability, vitality and fermentation …
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The effect of non-biological particulates on microbial cell disruption in a slurry bioreactor
Cell damage from hydrodynamic stress is an important consideration in biological systems since it can result in the growth and function of the cell becoming impaired (Toma et al. 1991, Lilly et al. 1992). In the extreme case of cell damage, cell disruption occurs. This dissertation presents the …
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Shear Stress-Mediated Tumor-Endothelial Cross Talk Regulates the Angiogenic Potential of Breast Tumors In Vitro
… fluid pressure and aberrant flow shear stress within the tumor microenvironment. While research has shown that the hydrodynamics of the tumor vasculature reduce transport and uptake of therapeutic agents, the underlying mechanisms by which fluid forces regulate vascular organization are …
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Zooplankton Dynamics in Wastewater Treatment High Rate Algal Ponds and development of effective control methods
… mechanical disruption of zooplankton using hydrodynamic shear stress, and the mechanical removal of zooplankton using filtration, using controlled laboratory conditions; 4) validated chronic CO₂ asphyxiation of zooplankton, the biocontrol of rotifers using the cladoceran M. tenuicornis and …
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Conception et réalisation d'un photobioréacteur adapté à l'étude de la production d'hydrogène chez les micro-algues. Application à l'étude de l'influence d'une NAD(P)H déshydrogénase-plastoquinone-réductase chloroplastique de type II sur le potentiel de photoproduction d'hydrogène chez Chlamydomonas reinhardtii.
… cells and therefore, highly sensitive to hydrodynamic stress; knowing that the study of hydrogen photobioproduction by microalgae was based on the capacity of degassing the culture medium, i.e. the need to obtain optimal hydrodynamic agitation favoring gas exchange. The main challenge was …
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Retention of fermentation biomass for extended L-Lysine fermentations
… data. The qualitative effects of the increased hydrodynamic shear stress experienced in the filtration recycling loop on the growth, metabolism and morphology of Corynebacterium glutamicum cells have been investigated. It was found that the cell volume increases under increased hydrodynamic …