Generalized Stoichiometry and Biogeochemistry for Astrobiological Applications

Area of Science:

• Astrobiology
• Biogeochemistry
• Planetary Science

Background:

• Life's elemental ratios, famously characterized by Redfield, are crucial for astrobiology.
• Understanding elemental ratio variations is key to differentiating biotic from abiotic chemical systems.
• Existing models require generalization for extraterrestrial applications.

Purpose of the Study:

• To develop a generalized framework for predicting elemental ratio variations in diverse environments.
• To systematize observed elemental ratio variations using physiological and ecological dynamics.
• To generalize elemental ratio concepts beyond Earth-based life for astrobiological contexts.

Main Methods:

• Expanding generalized physiological models.
• Developing a simple framework for predicting elemental ratio variation.
• Connecting theoretical treatment to in situ measurements for planetary missions.

Main Results:

• A theoretical framework is established for predicting elemental ratio variations.
• The framework integrates particle/cell size, stoichiometry, and environmental stoichiometry.
• The approach is designed for in situ measurements on future astrobiological missions.

Conclusions:

• The developed framework offers a generalized approach to elemental ratios in astrobiology.
• This work facilitates the search for life by providing tools to interpret chemical signatures.
• Further generalization of physiology is discussed for broader astrobiological applications.