Thermodynamic and quantum chemical study of the conversion of chorismate to (pyruvate + 4-hydroxybenzoate)

Article Abstract:

The transformation of chorismate to (pyruvate + 4-hydroxybenzoate) has been studied through microcalorimetry and high-performance liquid chromatography. The biochemical reaction leads to the production of ubiquinone or coenzyme Q. The primary changes in this reaction are the cleavage of the 2-alkylpropenoic acid side chain from the chorismate and the resonance stabilization of 4-hydroxybenzoate. A genetically-modified sample of chorismate lyase isolated from Escherichia coli ubiC gene is used in the research.

Physiological aspects, Escherichia coli, Enzymes, Enzyme kinetics, Enzyme structure-activity relationships

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Statistical thermodynamic approach for evaluatng the Writhe transformations in circular DNAs

Article Abstract:

A simple elastic model was developed to approach the problem of the sequence-dependent writhe transformations to predict the sequence-dependent circularization propensity of DNA. Another objective is to obtain an analytical solution for the first and second writhe transition in the case of small-sized DNAs. Comparison with the Monte Carlo results proves the validity of the proposed model as an alternative to computationally heavy Monte Carlo simulations.

Research, Evaluation, Circular DNA, Monte Carlo method, Monte Carlo methods

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Particle (electron, proton) transfer and self-organization in active thermodynamic reservoirs

Article Abstract:

A model of the isothermal Maxwell demon effect, involving the active behavior of the thermodynamic bath accompanying particle transfer, is derived. It is shown that Maxwell demon effect is due to the cooperation between the particle and the surrounding bath modes. The effect includes single-particle rectification, induced particle self-organization and uphill particle transfer at the cost of energy of a single and nonequilibrium infinite bath.

Models, Particles, Particulate matter, Transport theory

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