Evidence of Chemical Wave-Electric Field Interaction in Bacterial Cells

Recent research reveals that charge imbalance and spatial confinement within bacteria's tiny cells generate electric fields. Utilizing Poisson-Nernst-Planck modeling, scientists discovered that the unequal effectiveness of cations and anions, along with the confined geometry, results in extended intracellular diffuse layers and persistent electric fields.

The study specifically focuses on the Min-protein oscillator found in Escherichia coli, showing that these electric fields directly interact with chemical waves. This coupling affects the dispersion-mode structure, triggers mode crossings, and amplifies Turing and Hopf-Turing instabilities over intermediate length scales. By shaping the omega-k spectrum, the electric fields determine optimal wavelengths and growth-rate velocities for these instabilities.

To substantiate these findings, experiments involving wild-type, anucleate, and antibiotic-treated cells, alongside simulations accounting for nucleoid-dependent charge density and field strength, were conducted. These combined approaches confirmed the theoretical predictions and elucidated the observed pattern asymmetries and frequency modulations.

An important insight from this research is that the asymmetric coupling of wave fields to intracellular electric fields promotes quasi-periodicity. This effect arises from controlled mode competition, which improves the system's robustness against noise, variations in cell size, and growth rates. The findings demonstrate that intracellular electric fields play a crucial role in biochemical patterning, suggesting a broader significance of wave-field interactions in cellular self-organization processes.