NanoSIMS Analysis of Anaerobic Phototrophic Bacteria Ecophysiology

The Application

Environmental microbiology seeks to understand how microorganisms drive essential biogeochemical processes—such as carbon and nitrogen cycling—within natural ecosystems.

The Challenge

Microbial communities are extremely heterogeneous—organisms that appear similar can behave very differently, and low-abundance or low-activity microbes often drive key ecological processes but remain difficult to detect. Measuring subcellular isotopic enrichment requires both nanoscale resolution and ultrahigh sensitivity, while bulk analyses obscure individual cell variability and prevent any correlation between identity and function. As a result, conventional microscopy, molecular biology, and bulk isotope techniques cannot reliably identify or quantify the metabolic activity of single environmental microbes.

Our Unique Solution

Based on the SIMS technique, CAMECA’s NanoSIMS-HR platform uniquely overcomes these challenges, offering capabilities unmatched by other analytical techniques:

• Lateral resolution down to 30 nm, essential for measuring isotope ratios such as ¹³C/¹²C and ¹⁵N/¹⁴N at the level of individual microbes.
• Parallel multi-elemental imaging, up to seven masses, enabling simultaneous acquisition of multiple masses—including C, N, F, and labeled isotopes.
• Detection of low abundance but high impact microbes, highlighting the ecological significance of inconspicuous microbes.
• Perfect suitability for delicate biological samples, supporting life science and environmental applications.

These combined strengths make NanoSIMS-HR a transformative technology for environmental microbiology, opening new avenues for studying microbial interactions, ecosystem functioning, and biogeochemical cycles.

Case Study

Researchers combined NanoSIMS isotope imaging (¹³C, ¹⁵N) with phylogenetic labeling to track how individual microbial cells take up labeled substrates. This approach provided high-resolution insight into the metabolic activity of single environmental microbes—including rare or low activity microbes—without the need for culturing.

From: A single cell view on the ecophysiology of anaerobic phototrophic bacteria. N. Musat et al. PNAS.

Best-fit product: CAMECA NanoSIMS-HR

The NanoSIMS-HR is the ideal system for environmental microbiology research, offering:

• Lateral resolution down to 30 nm, essential for imaging at small scale.
• Exceptional sensitivity, for both light and heavy elements.
• Parallel detection of up to seven masses.

This combination of resolution, sensitivity, and multi isotope imaging makes the NanoSIMS-HR the reference instrument for cutting-edge research in microbial ecology and environmental systems science.

Learn More

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