A mathematical model is developed to describe the contaminant transport, sorption, and biodegradation in saturated porous media. In the model development, sorption was accounted for as a kinetic process for the contaminant transport. In addition, a double Monod function was incorporated into the model to describe the biodegradation of contaminants and utilization of oxygen. In the description o...

Productivity improvements of mammalian cell culture in the production of recombinant proteins have been made by optimizing cell lines, media, and process operation. This led to enhanced titers and process robustness without increasing the cost of the upstream processing (USP); however, a downstream bottleneck remains. In terms of process control improvement, the process analytical technology (P...

abstract in this work, the dry reforming of methane was studied using a corona and glow discharge plasma microreactors. a chemical kinetic model was developed to understand the reaction better. the modelization allowed prediction of the reactants conversion according to the energy transfer to the gas (p×τ). the β value is trait of the energy cost, whatever this value was leeser indicated better...

The conversion of glycerol to 1,3-propanediol (1,3-PD) by Clostridium acetobutylicum ATCC 4259 was studied in an anaerobic culture using commercial glycerol as the sole carbon source. The objective of this study was to determine the best concentration of glycerol used for the production of 1,3-propanediol and to study the cell growth kinetics of Clostridium acetobutylicum ATCC 4259 using fermen...

In this study, a mathematical model was proposed and the accuracy of this model was assessed to predict the growth of Pseudomonas aeruginosa and rhamnolipid production under nitrogen limiting (sodium nitrate) fed-batch fermentation. All of the parameters used in this model were achieved individually without using any data from the literature. The overall growth kinetic of the strain was evaluat...

Biochemical reactions occurring during anaerobic digestion have been modelled using reaction kinetic equations such as first-order, Contois and Monod which are then combined to form mechanistic models. This work considers models which include between one and three biochemical reactions to investigate if the choice of the reaction rate equation, complexity of the model structure as well as the i...

Pollutants such as pesticides and their degradation products occur ubiquitously in natural aquatic environments at trace concentrations (μg L(-1) and lower). Microbial biodegradation processes have long been known to contribute to the attenuation of pesticides in contaminated environments. However, challenges remain in developing engineered remediation strategies for pesticide-contaminated envi...

Explanation: Monod sign indicates the presence of a mycetoma within a lung cavity. This radiographic appearance of a “uniform, rounded opacity which isytopped by a clear crescent” was described in 1954 by Pesle and Monod.1 Free movement of the mass helps distinguish Monod sign from similar-appearing radiographic signs in which the lesion is fixed, and supports the presence of a mycetoma. Howeve...

Background Phenols are chemical compounds which are included in the high priority of pollutants by environmental protection agency (USEPA). The presence of high concentrations of phenols in wastewaters like oil refineries, petrochemical plants, olive oil, pesticide production and oil field operations contain high soluble solids (TDS) and in an olive oil plant, wastewater is acidic, high salty a...

The global asymptotic behavior of solutions of the variable yield model is determined. The model generalizes the classical Monod model and it assumes that the yield is an increasing function of the nutrient concentration. In contrast to the Monod model, it is demonstrated that the variable yield model exhibits sustained oscillations. Moreover, it is shown that the variable yield model may under...