Microbial degradation of hydrocarbons in the environment.

http://bioprocesos.unq.edu.ar/Biopro%20II/Paper%20escalado.pdf

Bioreactor scale-up and oxygen transfer rate in microbial processes: An overview

Article de synthese sur le role antimicrobien du dioxyde de carbone au niveau des aliments (eau, lait, poisson, fruits, legumes), et sur la croissance microbienne au cours de divers procedes de fermentation

The inhibition by CO2 of the growth and metabolism of micro-organisms

Biodegradation of hydrophobic organic compounds in polluted soil is a process involving interactions among soil particles, pollutants, water, and micro-organisms. Surface-active agents or surfactants are compounds that may affect these interactions, and the use of these compounds may be a means of overcoming the problem of limited bioavailability of hydrophobic organic pollutants in biological soil remediation. The effects of surfactants on the physiology of micro-organisms range from inhibition of growth due to surfactant toxicity to stimulation of growth caused by the use of surfactants as a co-substrate. The most important effect of surfactants on the interactions among soil and pollutant is stimulation of mass transport of the pollutant from the soil to the aqueous phase. This can be caused by three different mechanisms: emulsification of liquid pollutant, micellar solubilisation, and facilitated transport. The importance of these mechanisms with respect to the effect of surfactants on bioavailability is reviewed for hydrophobic organic pollutants present in different physical states. The complexity of the effect of surfactants on pollutant bioavailability is reflected by the results in the literature, which range from stimulation to inhibition of desorption and biodegradation of polluting compounds. No general trends can be found in these results. Therefore, more research is necessary to make the application of surfactants a standard tool in biological soil remediation.

Microbiological aspects of surfactant use for biological soil remediation

Prediction of the performance of preparative affinity chromatography.

Gas Absorption by Newtonian and Non-Newtonian Fluids in Sparged Agitated Vessels

Gas Absorption by Newtonian and Non-Newtonian Liquids in a Bubble Column

Oxygen Absorption into Oil-in-Water Emulsions. A Study on Hydrocarbon Fermentors

Candida tropicalis was cultured with n-hexadecane, dispersed in water as submicron droplets, as the only carbon substrate; the emulsion being fed continuously into a fermentor containing only an aqueous medium (fed-batch culture). The results have demonstrated that the organism takes up hydrocarbon accommodated in the aqueous phase as submicron droplets. The cell/substrate yield for the linear growth phase, where growth was limited by the supply of the substrate, was much higher than the yield for the exponential growth phase.

Fed‐batch hydrocarbon fermentation with colloidal emulsion feed

Performance of affinity chromatography columns was studied by measuring the rates of adsorption and elution of trypsin in a Sepharose 4B-soybean trypsin inhibitor column and a Sepharose 4B-arginine peptides column The volumetric coefficient for trypsin transfer was evaluated from the break-through curves of trypsin, and elution profiles bed height of Sepharose 4B-STI column was estimated based on these results

Fumitake Yoshida

Papers

Gas Absorption by Newtonian and Non-Newtonian Fluids in Sparged Agitated Vessels

Gas Absorption by Newtonian and Non-Newtonian Liquids in a Bubble Column

Oxygen Absorption into Oil-in-Water Emulsions. A Study on Hydrocarbon Fermentors

Fed‐batch hydrocarbon fermentation with colloidal emulsion feed

Performance of affinity chromatography columns