Search Results - "Willie Nicol"

Continuous Production of Fumaric Acid with Immobilised Rhizopus oryzae: The Role of pH and Urea Addition by Reuben Marc Swart, Dominic Kibet Ronoh, Hendrik Brink, Willie Nicol

“…Fumaric acid is widely used in the food and beverage, pharmaceutical and polyester resin industries. Rhizopus oryzae is the most successful microorganism at…”
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Rhizopus oryzae for Fumaric Acid Production: Optimising the Use of a Synthetic Lignocellulosic Hydrolysate by Swart, Reuben Marc, Brink, Hendrik, Nicol, Willie

“…The hydrolysis of lignocellulosic biomass opens an array of bioconversion possibilities for producing fuels and chemicals. Microbial fermentation is…”
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The Effect of pH, Metal Ions, and Insoluble Solids on the Production of Fumarate and Malate by Rhizopus delemar in the Presence of CaCO3 by Dominic Kibet Ronoh, Reuben Marc Swart, Willie Nicol, Hendrik Brink

“…Calcium carbonate has been extensively used as a neutralising agent in acid-forming microbial processes. The effect of increasing calcium carbonate…”
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pH-Based Control Strategies for the Nitrification of High-Ammonium Wastewaters by van Rooyen, Ignatius Leopoldus, Brink, Hendrik Gideon, Nicol, Willie

“…Aquatic nitrogen pollution is one of the most urgent environmental issues requiring prevention and mitigation. Large quantities of high-ammonium wastewaters…”
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Fast X-ray tomography for the quantification of the bubbling-, turbulent- and fast fluidization-flow regimes and void structures by Saayman, Jean, Nicol, Willie, Van Ommen, J. Ruud, Mudde, Robert F.

“…[Display omitted] •Multiple regimes were successfully characterised using X-ray tomography.•Characterization was done using pressure- and solids fraction…”
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Identifying Energy Extraction Optimisation Strategies of Actinobacillus succinogenes by Waldo Gideon Lexow, Sekgetho Charles Mokwatlo, Hendrik Gideon Brink, Willie Nicol

“…A. succinogenes is well known for utilising various catabolic pathways. A multitude of batch fermentation studies confirm flux shifts in the catabolism as time…”
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Optimal Growth Conditions for Azolla pinnata R. Brown: Impacts of Light Intensity, Nitrogen Addition, pH Control, and Humidity by da Silva, Maria Emelia Jesus, Mathe, Lebani Oarabile Joy, van Rooyen, Ignatius Leopoldus, Brink, Hendrik Gideon, Nicol, Willie

“…Nitrogen pollution from agriculture is a major challenge facing our society today. Biological nitrogen fixation is key to combat the damage that is caused by…”
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Online Control of Lemna minor L. Phytoremediation: Using pH to Minimize the Nitrogen Outlet Concentration by Sigcau, Kwanele, van Rooyen, Ignatius Leopoldus, Hoek, Zian, Brink, Hendrik Gideon, Nicol, Willie

“…Phytoremediation technologies are employed worldwide to remove nutrient pollutants from agricultural and industrial wastewater. Unlike in algae-based nutrient…”
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Malic Acid Production by Aspergillus Oryzae: The Role of CaCO3 by Monique Geyer, Faith M. Onyancha, Willie Nicol, Hendrik G. Brink

“…This study investigated the malic acid production capability of Aspergillus oryzae NRRL 3488 with three different CaCO3 concentrations, 20 g/L, 80 g/L, and 120…”
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Succinic acid production on xylose-enriched biorefinery streams by Actinobacillus succinogenes in batch fermentation by Salvachúa, Davinia, Mohagheghi, Ali, Smith, Holly, Bradfield, Michael F A, Nicol, Willie, Black, Brenna A, Biddy, Mary J, Dowe, Nancy, Beckham, Gregg T

“…Co-production of chemicals from lignocellulosic biomass alongside fuels holds promise for improving the economic outlook of integrated biorefineries. In…”
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Continuous succinic acid production by Actinobacillus succinogenes on xylose-enriched hydrolysate by Bradfield, Michael F A, Mohagheghi, Ali, Salvachúa, Davinia, Smith, Holly, Black, Brenna A, Dowe, Nancy, Beckham, Gregg T, Nicol, Willie

“…Bio-manufacturing of high-value chemicals in parallel to renewable biofuels has the potential to dramatically improve the overall economic landscape of…”
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Malic acid production through the whole-cell hydration of fumaric acid with immobilised Rhizopus oryzae by Naude, Andre, Nicol, Willie

“…•Rhizopus oryzae demonstrated excellent malic acid production capabilities.•Biomass preparation was easier compared to existing processes.•No by-products were…”
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Fumaric acid fermentation with immobilised Rhizopus oryzae: Quantifying time-dependent variations in catabolic flux by Naude, Andre, Nicol, Willie

“…[Display omitted] •Three distinct production phases were observed.•ATP production from respiration had an upper bound–2mmol ATPgbiomass−1h−1.•Instantaneous…”
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Fumarate production with Rhizopus oryzae : utilising the Crabtree effect to minimise ethanol by-product formation by Swart, Reuben M, le Roux, Francois, Naude, Andre, de Jongh, Nicolaas W, Nicol, Willie

“…The four-carbon dicarboxylic acids of the tricarboxylic acid cycle (malate, fumarate and succinate) remain promising bio-based alternatives to various…”
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Improved continuous fumaric acid production with immobilised Rhizopus oryzae by implementation of a revised nitrogen control strategy by Naude, Andre, Nicol, Willie

“…•A new nitrogen control mechanism is proposed where nitrogen is fed continuously.•Ethanol production decreased over time at low urea feed rates…”
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Optimal hydroponic growth of Brassica oleracea at low nitrogen concentrations using a novel pH-based control strategy by van Rooyen, Ignatius Leopoldus, Nicol, Willie

“…Aquatic nitrogen pollution from conventional agriculture contributes severely to the degradation of numerous ecosystems and is considered one of the main…”
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Continuous succinic acid fermentation by Escherichia coli KJ122 with cell recycle by Krige, Adolf, Nicol, Willie

“…[Display omitted] •Productivity of 3gL−1h−1 and yield of 0.77gg−1 achieved at D=0.15h−1.•Increased pyruvate dehydrogenase activity at higher D contributes to…”
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Inferential control of the phosphate concentration in hydroponic systems via measurement of the nutrient solution's pH-buffering capacity by van Rooyen, Ignatius Leopoldus, Nicol, Willie

“…•Phosphate concentration control at lower levels is a viable option.•The phosphate concentration is controlled using pH measurement only.•Equal growth rates…”
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Structure and cell viability analysis of Actinobacillus succinogenes biofilms as biocatalysts for succinic acid production by Mokwatlo, Sekgetho Charles, Nicol, Willie

“…[Display omitted] •Biofilms exibited a heterogeneous structure.•Biofilm cell viability increased towards the top layer of the biofilm.•Sessile cells exibited a…”
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Internal mass transfer considerations in biofilms of succinic acid producing Actinobacillus succinogenes by Mokwatlo, Sekgetho Charles, Nicol, Willie, Brink, Hendrik Gideon

“…•Internal mass transport considerations are critical in A. succinogenes biofilms.•Internal mass transport governs long term stability and biofilm…”
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