Development of Broad-Range Microbial Minimal Culture Medium for Lanthanide Studies
Gianmaria Oliva1, Giovanni Vigliotta1, Luca Di Stasio1
1Department of Chemistry and Biology "A. Zambelli", University of Salerno, 84084 Fisciano, SA, Italy.
Microorganisms
|August 29, 2024
Summary
Researchers developed a novel minimal medium to study Rare Earth Elements (REE) interactions with microbes. This medium enhances REE solubility, enabling the study of microbial growth and element uptake in bacteria and fungi.
Area of Science:
- Microbiology
- Environmental Science
- Biochemistry
Background:
- Rare Earth Elements (Lanthanides, Ln³⁺) possess unique properties, but their biological roles and toxicity, especially in microorganisms, are poorly understood.
- Limited studies exist due to Ln³⁺ precipitation in standard culture media, hindering research on microbial interactions.
- Developing a specialized minimal medium is crucial for investigating Ln³⁺-microbial dynamics by preventing salt precipitation.
Purpose of the Study:
- To create a novel minimal culture medium that effectively solubilizes large concentrations of Ln³⁺.
- To enable and facilitate the study of Ln³⁺ interactions with diverse microbial taxa.
- To define the growth kinetics and element uptake of specific microbial strains in the presence of Ln³⁺.
Main Methods:
- Development of a new minimal culture medium designed to maximize Ln³⁺ solubility.
- Culturing of various microbial taxa, including bacteria and fungi, in the developed medium.
- Kinetic growth analysis of a yeast and a Gram-positive bacterium; testing sensitivity, uptake, and accumulation of Cerium, Gadolinium, and Lanthanum in *Bacillus stratosphericus*.
Main Results:
- The new medium solubilizes Ln³⁺ up to 100 times more effectively than conventional media.
- The medium successfully supported the growth of 63 bacterial and 5 fungal species.
- Superior growth and biomass were observed for a yeast and a Gram-positive bacterium compared to standard media. *Bacillus stratosphericus* tolerated up to 10 mM of Cerium, Gadolinium, or Lanthanum and accumulated varying amounts.
Conclusions:
- A novel minimal medium has been successfully developed, overcoming Ln³⁺ precipitation issues.
- This medium is effective for studying Ln³⁺-microbial interactions and supports the growth of diverse microorganisms.
- The study provides insights into microbial tolerance and accumulation of specific Rare Earth Elements, opening avenues for further research.
