1. Microbial Trace Metal Requirements: Limiting Nutrients and Potential Biosignatures Open Access Author: Zerkle, Aubrey L. Title: Microbial Trace Metal Requirements: Limiting Nutrients and Potential Biosignatures Graduate Program: Geosciences Keywords: trace metalsbiogeochemistrynitrogen fixationmetal limitationmetallomicsbiogeochemical cycling File: Download DISS_FINAL_ZERKLE.pdf Committee Members: Christopher Howard House, Committee Chair/Co-ChairSusan Louise Brantley, Committee MemberLee Kump, Committee MemberHunter J Carrick, Committee MemberDonald E Canfield, Committee Member