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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 20 of 39 for “"dilution rate"”.
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A study of the effect of dilution rate on bacterial populations
… the atmosphere was studied at various constant dilution rates. Random fluctuations in the free swimmer population were noted. An aseptic continuous flow system proved of no great advantage over that which had ambient inoculation, however, slime production did not follow identical growth patterns …
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Effects of Sodium Bicarbonate, Sodium Chloride, Limestone, and Monensin on Rumen Fermentation, Rumen Fluid Dilution Rate, and Nutrient Utilization in Ruminants
Four experiments were conducted to determine the ability of mineral salts and monesin to alter the rumen environment and the efficiency of nutrient utilization in ruminants.
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Growth dynamics of microorganisms
… Counter, yeast populations were sized and enumerated electronically over a range or dilution rates. Total dry weight and Kjeldahl nitrogen per cell were determined for a variety or dilution rates. From these data it was shown that the yeast definitely increased in size as the dilution rate …
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The Fermentation of Cheese Whey by Lactobacilius helvecticus
… this technique, the variation of specific growth rate with pH, temperature and stiirer speed was assessed.<br/><br/>Cell growth and lactic acid formation in whey permeate containing various supplements, were investigated. Yeast extract was the most effective nitrogen/growth factor supplement. …
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Tower Continuous Fermentation of Cellulosic Wastes
… and newspaper were used as model substrates. Five cellulolytic fungi were selected from the literature for their bioconversion abilities. Their optimum pH and temperature for growth were determined on agar fermentation media by their linear growth rate. Batch cultures at their pH and …
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Adaptive Laboratory Evolution of Scenedesmus obliquus for Increased Carbohydrate Content and Biomass Productivity
… of energy storage compounds, such as carbohydrates and lipids, and increased biomass productivity. This thesis explores two adaptive laboratory evolution strategies for improving <em>Scenedesmus obliquus</em>: single UV-mutagenesis and low light cultivation at a high dilution rate to produce …
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Towards value from waste: Bioreactor selection for the reduction of nutrient load and production of Poly-y-glutamic acid
… classified as waste is becoming a necessary strategy to long term sustainability, through concepts such as circular economies. The re-use and reimagination of wastewater through the concept of a wastewater biorefinery (WWBR) is one such potential opportunity. It is the merging of integrated …
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Mitigation of ammonia gas from animal house using microalgae
… algae-based method for removing ammonia gas generated from animal housing operations while producing a biomass with high protein content which can be potentially used as high-value animal feed products. The green algae Scenedesmus dimorphus was used for evaluating its ability to mitigate ammonia …
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Guanosine 5'-diphosphate 3'-diphosphate (ppGpp), guanosine 5'-diphosphate 3'-monophosphate (ppGp) and antibiotic production in Streptomyces clavuligerus
… not detected under phosphate limitation at any dilution rate. Increased production of cephamycin C was observed at D=0.02 If' under nitrogen limitation coinciding with the detection of elevated levels of ppGpp, ppGp and ATP. Increased production of clavulanic acid was observed at D=0.02 If' …
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Regulation of Ammonia Assimilating Enzymes in the Ruminal Bacteria Selenomonas Ruminantium and Succinivibrio Dextrinosolvens
… continuous culture under glucose-limitation at dilution rates of .05, .10, .20, .30 and .42 and under ammonia-limitation at dilution rates of .05, .10 and .20, to determine the effects of dilution rate and growth-limiting nutrients on cell physiology, efficiency of growth and ammonia …
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Fermentation methods for dextransucrase production
… In conventional continuous culture the dilution rate was varied in the range between 0.375 h-1 to 0.55 h-1. The general pattern observed from the data obtained was that the enzyme activity decreased with increase in dilution rate. In these experiments the maximum value of enzyme activity …
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Linking microbial community dynamics and performance of a biological sulphate reducing system using a mixed volatile fatty acid stream as electron donor
… attracted attention as a sulphate remediation strategy as they offer a cheap alternative to other sulphate removal technologies such as chemical approaches. In addition, the concomitant generation of alkalinity and soluble sulphide assist in neutralisation and heavy metal removal. One of the …
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Mixotrophic Production of Omega-3 Fatty Acid-rich Alga Phaeodactylum tricornutum on Biodiesel-derived Crude Glycerol
… growth concurrently. EPA is an omega-3 polyunsaturated fatty acid that has been demonstrated to have a multitude of beneficial health effects, including maintaining human cardiovascular health, treating cancer and human depression diseases, and an anti-obesity effect. In this study, the potential …
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Production of Bacterial Cellulose Using Low-cost Media
… bioreactors. Three different processing strategies were used in the bioreactors: batch, fed-batch and continuous. The morphology of the BC depended on the growth conditions. Thin sheets were formed in stationary cultures and pellicles were formed in agitated cultures. The scanning electron …
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Mathematical modeling of the acetone-butanol fermentation for the purposes of bioreactor design
… kinetics have been modeled as functions of substrate, butyrate, and butanol concentrations and pH. These models have been applied to simulate batch, single stage stirred continuous, and two stage stirred continuous fermentations. The batch simulation results accurately reproduced trends of cell …
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Laboratory investigation of a method for determining in situ saturated hydraulic conductivity
… of a method for determining in situ saturated hydraulic conductivity in porous media. This method requires an accurate measurement of the horizontal port water speed through a section of a borehole packed with a porous material of known hydraulic conductivity. Analytical expressions …
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Terminal anerobic interactions in a microbial association isolated from landfill
… sulphate.;To assess the effect of a non constant dilution rate regime on the microbial association a 3-stage chemostat was constructed in which the volume was increased from an initial 310 ml in the first vessel to 700 ml in the second and finally to 1600 ml in the third. The imposed dilution rate …
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Process development and scale-up from shake flask to fermenter of suspended and immobilized aerobic microorganisms
… or continuous mode. The applicability is demonstrated with the biological model system Corynebacterium glutamicum grown on lactic acid. Respiration measurement in shake flasks is introduced as a screening method to characterize the behavior of microorganisms exposed to stress factors such as …
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Forward and inverse metabolic engineering strategies for improving polyhydroxybyrate production
… IME approaches were applied to poly-3-hydroxybutyrate (PHB)production in Synechocystis PCC6803 [IME] and recombinant E. coli [FME] in this thesis.IME was appropriate for Synechocystis, where metabolic regulation of the native PHB pathway was not well understood. A high throughput screening method …
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The Utilization of Low-grade Carbohydrates
… of useful materials from a class of carbohydrate resources presently under-utilized and even wasted. The use of both carbohydrate-containing crops and processing wastes as fermentation substrates was extensively reviewed. It was concluded that a simple cheap fermentation process for the …
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