DataSheet1_Biolocomotion and Premelting in Ice.pdf

• Main Authors: Jérémy Vachier, John S. Wettlaufer
• Format: Dataset
• Language: unknown
• Published: 2022
• Subjects: Biophysics; Astrophysics; Applied Physics; Computational Physics; Condensed Matter Physics; Particle Physics; Plasma Physics; Solar System; Solar Physics; Planets and Exoplanets; Classical and Physical Optics; Photonics; Optoelectronics and Optical Communications; Cloud Physics; Tropospheric and Stratospheric Physics; High Energy Astrophysics; Cosmic Rays; Mesospheric; Ionospheric and Magnetospheric Physics; Space and Solar Physics; Mathematical Physics not elsewhere classified; Physical Chemistry of Materials; Physical Chemistry not elsewhere classified; Classical Physics not elsewhere classified; Condensed Matter Physics not elsewhere classified; Quantum Physics not elsewhere classified; bioparticles; premelting; biolocomotion; active matter; Ornstein-Uhlenbeck process; extremophiles; Ice; permafrost
• Online Access: https://doi.org/10.3389/fphy.2022.904836.s001; https://figshare.com/articles/dataset/DataSheet1_Biolocomotion_and_Premelting_in_Ice_pdf/20206484

Biota are found in glaciers, ice sheets and permafrost. Ice bound micro-organisms evolve in a complex mobile environment facilitated or hindered by a range of bulk and surface interactions. When a particle is embedded in a host solid near its bulk melting temperature, a melted film forms at the surface of the particle in a process known as interfacial premelting. Under a temperature gradient, the particle is driven by a thermomolecular pressure gradient toward regions of higher temperatures in a process called thermal regelation. When the host solid is ice and the particles are biota, thriving in their environment requires the development of strategies, such as producing exopolymeric substances (EPS) and antifreeze glycoproteins (AFP) that enhance the interfacial water. Therefore, thermal regelation is enhanced and modified by a process we term bio-enhanced premelting. Additionally, the motion of bioparticles is influenced by chemical gradients influenced by nutrients within the icy host body. We show how the overall trajectory of bioparticles is controlled by a competition between thermal regelation and directed biolocomotion. By re-casting this class of regelation phenomena in the stochastic framework of active Ornstein-Uhlenbeck dynamics, and using multiple scales analysis, we find that for an attractive (repulsive) nutrient source, that thermal regelation is enhanced (suppressed) by biolocomotion. This phenomena is important in astrobiology, the biosignatures of extremophiles and in terrestrial paleoclimatology.