Author

Heather Valeah Graham

Goddard Space Flight CenterORCID 0000-0002-1986-1885Unclaimed ORCID profile · follow to get notified of new preprints

Biology Disciplines

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Signature Assays, Organisms & Methods

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Approach:experimental assay· 3 Assay:metagenomics· 2 Research Focus:cell type annotation· 1 Research Focus:ecology & biodiversity· 1 Research Focus:host-pathogen & immune response· 1

Frequent Co-Authors

Daniel S. JonesiD· 2 shared Jennifer C. SterniD· 2 shared Maurizio MainieroiD· 2 shared Scott D. WankeliD· 2 shared A. B. RegbergiD· 1 shared Arthur McClellandiD· 1 shared Douglas Edward LaRoweiD· 1 shared Eric Ellison· 1 shared

Activity by Year

2025-2026 · peak 2/yr

Co-Author Collaboration Network

10 top collaborators · 20 mutual co-author links

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2 shared papersMicrobiology

Daniel S. JonesORCID

Mutual co-authors in cluster

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3 papers

Recent·Most cited

Compositional Heterogeneity Structures Microbial Microhabitats across Distinct Mineral Substrates

Federica Calabrese, Peter Schroedl, Nathan Hadland, Jason Yu, Arthur McClelland, Nicholas Colella, Ryan S. Jakubek, Eric Ellison, Lisa E. Mayhew, Solange Duhamel, Douglas Edward LaRowe, Heather Valeah Graham, A. B. Regberg, Jeffrey J. Marlow

The paper investigates how microbial biomass correlates with mineralogical heterogeneity in rock samples using Raman microspectroscopy and identifies three key patterns in biomass and mineral spectral relationships.

bioRxiv · Jul 31, 2026 · PreprintMicrobiology

Volatilized ammonia supports extremophilic cave ecosystems with unusual nitrogen isotopic signatures

Mackenzie B. Best, Scott D. Wankel, Heather Valeah Graham, Jennifer C. Stern, Jennifer L. Macalady, Maurizio Mainiero, Stefano Recanatini, Sandro Mariani, Ilenia M. D’Angeli, Ilaria Vaccarelli, Daniel S. Jones

The paper shows that ammonia volatilization and trapping in sulfidic caves provides a key nitrogen source for microbial biofilms and their associated ecosystems, leading to extreme nitrogen isotope depletion.

Environmental Science & Technology · May 15, 2026Peer-reviewedMicrobiology

Microbial ecology of acidic, biogenic gypsum: Community structure and distribution of extremophiles on freshly formed and relict sulfate deposits in a hydrogen sulfide-rich cave

Zoë E. Havlena, Katherine Lucero, Heather Valeah Graham, Jennifer C. Stern, Scott D. Wankel, Maurizio Mainiero, Daniel S. Jones

The paper characterizes microbial communities on acidic gypsum deposits in a sulfuric acid cave, finding differences in community structure between freshly formed and older deposits based on environmental conditions.

Applied and Environmental Microbiology · Sep 19, 2025Peer-reviewedMicrobiology