Dr. Muammar Mansor

Junior Group Leader


Universität Tübingen
Angewandte Geowissenschaften
Schnarrenbergstrasse 94-96
72076 Tübingen



As a nano-bio-geochemist, my main interest is in the area of microbial reactions that mediate important environmental processes on both the modern and ancient Earth, and even on other habitable worlds. I am particularly fascinated with the biogeochemistry of metals (e.g., Fe, Cu, Co, Ni) and sulfur, given these elements’ dual importance as bio-essential elements and being toxic at high concentrations. I use an interdisciplinary combination of molecular, geochemical, and modeling tools in order to elucidate the biogeochemical cycling of the elements from the nano- to the global-scale.

Current research interests include:

> Biogeochemistry of trace metals (e.g., Cu, Co, Ni, As) in the environment, and the impacts of Fe in affecting their distributions
> Nano-scale insights into microbial-mineral interactions
> Characterization of metal-bearing nanoparticles and their aggregates through electron microscopy
> Sulfide-based methods for remediation and recovery of heavy metals
> Single-particle or single-cell analysis of metal/mineral contents
> Stable isotope analysis (δ34S, non-traditional metal isotopes) as source and reaction tracers


Academic History

Junior Group Leader in Geomicrobiology

Postdoctoral fellow in Nanogeomicrobiology

Group of Prof. Jie Xu, University of Texas at El Paso, Texas (USA)

Research Assistant

Laboratory for Isotopes and Metals in the Environment (LIME), Penn State University, Pennsylvania (USA)

Ph.D student in Geosciences & Astrobiology

Co-advised by Prof. Matt Fantle & Prof. Macalady, Penn State University, Pennsylvania (USA)

Master's in Science

M.S. Biotechnology, Penn State University, Pennsylvania (USA)

Bachelor of Science

BSc. Biotechnology, Penn State University, Pennsylvania (USA)



Mansor, M. & Xu, J. (2020) “Benefits at the nanoscale: a review of nanoparticle‐enabled processes favouring microbial growth and functionality.” Environmental Microbiology.

Mansor, M., Cantando, E., Wang, Y., Hernandez-Viezcas, J., Gardea-Torresdey, J., Hochella Jr., M.F. & Xu, J. (2020) “Insights into the biogeochemical cycling of cobalt: Precipitation and transformation of cobalt sulfide nanoparticles under low-temperature aqueous conditions.” Environmental Science & Technology, 54(9), 5598-5607.


Mansor, M., Winkler, C., Hochella Jr., M.F. & Xu, J. (2019). “Nanoparticulate nickel-hosting phases in sulfidic environments: Effects of ferrous iron and bacterial presence on mineral formation mechanism and solid-phase nickel distribution.” Frontiers in Earth Science – Earth and Planetary Materials, 7, 151.

Mansor, M. & Fantle, M.S. (2019) “A novel framework for interpreting the pyrite-based Fe isotope records of the past.” Geochimica et Cosmochimica Acta, 253, 39-62.

Mansor, M., Berti, D., Hochella, M., Murayama, M. & Xu, J. (2019) “Phase, morphology, elemental composition and formation mechanisms of biogenic and abiogenic Fe-Cu-sulfide nanoparticles: A comparative study on their occurrences under anoxic conditions.” American Mineralogist, 104(5), 703-717.


Mansor, M., Harouaka, K., Gonzales, M.S., Macalady, J.L. & Fantle, M.S. (2018). “Transport-induced spatial patterns of sulfur isotopes (δ34S) as biosignatures.” Astrobiology, 18(1), 59-72.


Mansor, M. & Macalady, J.L. (2016). “Draft genome sequence of lampenflora Chlorobium limicola strain Frasassi in a sulfidic cave system.” Genome Announcements, 4(3), e00357-16.

Harouaka, K., Mansor, M., Macalady, J.L. & Fantle, M.S. (2016). “Calcium isotopic fractionation in microbially mediated gypsum precipitates.” Geochimica et Cosmochimica Acta, 184, 114-131.


Mansor, M., Hamilton, T.L., Fantle, M.S. & Macalady, J.L. (2015). “Metabolic diversity and ecological niches of Achromatium populations revealed with single-cell genomic sequencing.” Frontiers in Microbiology, 6.