Biochemical Reaction Rules with Constraints

After artificial recharging of groundwater some problems occurred, such as changes in groundwater quality, the silting up of recharge (injection) wells, etc. Therefore, the mechanisms of microbial effects on groundwater quality after artificial recharging were studied in Shanghai and the district of Changzhou. These problems were approached on the basis of the amounts of biochemical reaction products generated by the metabolism of iron bacteria, sulphate-reducing bacteria, Thiobacillusthioparus, and Thiobacillusdenitrificans. The experiments showed that in the transformations occurring and the siltation of recharge wells, microorganisms play an important role, due to the various chemical and biochemical activities. A water-rock-microorganisms system is proposed, and some methods for the prevention and treatment of these effects are given.

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Numerical Approximations to Solution of Biochemical Reaction Model

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.2606 ◽

2011 ◽

Vol 9 (1) ◽

Author(s):

Ahmet Yildirim ◽

Ahmet Gökdogan ◽

Mehmet Merdan

Keyword(s):

Analytical Solution ◽

Approximate Analytical Solution ◽

Transformation Method ◽

Reaction Model ◽

Biochemical Reaction ◽

Graphical Form ◽

Kutta Method ◽

Transform Method ◽

Runge Kutta Method ◽

Differential Transform

In this paper, approximate analytical solution of biochemical reaction model is used by the multi-step differential transform method (MsDTM) based on classical differential transformation method (DTM). Numerical results are compared to those obtained by the fourth-order Runge-Kutta method to illustrate the preciseness and effectiveness of the proposed method. Results are given explicit and graphical form.

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Ether Oxidation by an Evolved Fungal Heme-Peroxygenase: Insights into Substrate Recognition and Reactivity

Journal of Fungi ◽

10.3390/jof7080608 ◽

2021 ◽

Vol 7 (8) ◽

pp. 608

Author(s):

Raul Mireles ◽

Joaquin Ramirez-Ramirez ◽

Miguel Alcalde ◽

Marcela Ayala

Keyword(s):

Molecular Weight ◽

Environmental Conditions ◽

Substrate Recognition ◽

Enzyme Inactivation ◽

Biochemical Reaction ◽

Low Molecular Weight ◽

Factors Influencing ◽

Secondary Reactions ◽

Oxidation Efficiency ◽

Favorable Conditions

Ethers can be found in the environment as structural, active or even pollutant molecules, although their degradation is not efficient under environmental conditions. Fungal unspecific heme-peroxygenases (UPO were reported to degrade low-molecular-weight ethers through an H2O2-dependent oxidative cleavage mechanism. Here, we report the oxidation of a series of structurally related aromatic ethers, catalyzed by a laboratory-evolved UPO (PaDa-I) aimed at elucidating the factors influencing this unusual biochemical reaction. Although some of the studied ethers were substrates of the enzyme, they were not efficiently transformed and, as a consequence, secondary reactions (such as the dismutation of H2O2 through catalase-like activity and suicide enzyme inactivation) became significant, affecting the oxidation efficiency. The set of reactions that compete during UPO-catalyzed ether oxidation were identified and quantified, in order to find favorable conditions that promote ether oxidation over the secondary reactions.

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