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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Nucleation: the connections between equilibrium and kinetic behavior.

Frank A Ferrone¹

¹Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA.

Methods in Enzymology

|October 19, 2006

Summary

Thermodynamics of nucleus formation in sickle hemoglobin aggregation reveal that nucleus size depends on initial conditions. Molecular motion within the nucleus also recovers significant entropy, challenging assumptions of immobilization.

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Area of Science:

Thermodynamics
Biophysics
Molecular aggregation

Background:

Nuclei are transient, unstable species in the formation pathway of large, linear aggregates.
Understanding nucleus formation is crucial for comprehending aggregation processes, such as in sickle hemoglobin.
Previous models often simplified the dynamics within these initial aggregate structures.

Purpose of the Study:

To describe the thermodynamics governing nucleus formation in linear aggregate pathways.
To utilize parameters with direct molecular interpretations, like contact energies.
To model nucleus formation using sickle hemoglobin as a representative system.

Main Methods:

Applying thermodynamic principles to nucleus formation.
Employing parameters with direct molecular interpretations (e.g., contact energies).
Utilizing sickle hemoglobin aggregation as a case study.

Main Results:

Nucleus size is predicted to be dependent on initial conditions, specifically initial monomer concentration.
Molecular motion within the nucleus was found to recover substantial entropy.
This entropy recovery contrasts with the loss expected from complete molecular immobilization.

Conclusions:

The thermodynamics of nucleus formation are sensitive to initial conditions.
The dynamic nature of molecules within the nucleus plays a significant role in entropy.
This research provides a more nuanced understanding of early-stage aggregation processes.