Ian Marshall
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ianpgm.bsky.social
Ian Marshall
@ianpgm.bsky.social
Associate Professor at Department of Biology, Aarhus University, Denmark 🇩🇰 working on microbial genomics, bioinformatics, cable bacteria, and other sediment microorganisms. https://www.au.dk/en/[email protected]/ 🇦🇺
Reposted by Ian Marshall
Want to ride the front of the wave of all-things-microbiology; field work, cultivation, microscopy, molecular, bioinformatics and AI tools? Me too!
Please join us @mblscience.bsky.social for the 2026 Summer Microbial Diversity Course!
Applications due soon.
www.mbl.edu/education/ad...
Microbial Diversity | Marine Biological Laboratory
The goal of the course is to teach professors, postdocs and advanced graduate students how to discover, cultivate, and isolate diverse microorganisms catalyzing a breadth of chemical transformations, ...
www.mbl.edu
February 2, 2026 at 9:58 PM
Reposted by Ian Marshall
Highly efficient bio-catalytic oxygen reduction coupled to long-range electron transport in cable bacteria www.biorxiv.org/content/10.6... #jcampubs
Highly efficient bio-catalytic oxygen reduction coupled to long-range electron transport in cable bacteria
Multicellular cable bacteria are capable of transferring electrons over centimeter distances through an internal array of conductive fibers. These long, filamentous bacteria function as a living electrochemical cell, performing sulfide reduction at one end and oxygen reduction at the other end. To investigate how O2 reduction is linked to the long-distance electron transport along the conductive fibers, we performed a detailed electrochemical characterization of native filaments as well as extracted fiber skeletons without membranes or cytoplasm. Our data show that fibers skeletons only perform longitudinal electron transport and are not electrochemically active towards oxygen. This opposes a previous proposition that the conductive fiber network displays electrocatalytic behavior towards oxygen. Still, native cable bacterium filaments are capable of high oxygen reduction rates, thus demonstrating that dedicated enzyme systems in the periplasm or inner membrane are responsible for O2 reduction. Together, our data provide empirical support for a model in which diffusible c-type cytochromes mediate electron transport through the periplasm, shuttling electrons between separate respiratory complexes and the conductive fiber network. As such, our study resolves a crucial aspect of the unique electrogenic metabolism in cable bacteria, and clarifies the application potential of the highly conductive fibers in Bio-electrochemical System technologies. ### Competing Interest Statement The authors have declared no competing interest. Research Foundation - Flanders, https://ror.org/03qtxy027, S004523N, G0ADR25N, 11D7822N University of Antwerp, https://ror.org/008x57b05, TopBof European Innovation Council, PRINGLE 101046719
www.biorxiv.org
January 21, 2026 at 7:11 PM
Me too...
“Moreover, the very small size of most microbial cells has a profound effect on their ecology and dictates many aspects of their biology.” We read the same books Dirk-Jan
Pick up the nearest book. Turn to page 42, and post the second sentence.

“Moreover, the very small size of most microbial cells has a profound effect on their ecology and dictates many aspects of their biology.”
January 21, 2026 at 11:57 AM
Reposted by Ian Marshall
Yesterday it was cows using tools, today its penguins using satellite imagery.
January 20, 2026 at 6:44 PM
Reposted by Ian Marshall
Reposted by Ian Marshall
LPSN wird ELIXIR Core Data Resource! Zentrale Liste für Mikroben-Namen – einfach & topaktuell für Forscher. Check it: tinyurl.com/bddz9mew

#Mikrobenforschung #Wissenschaft #ELIXIR #Bio
January 16, 2026 at 9:57 AM
Reposted by Ian Marshall
Genomic adaptation strategies to habitat switching in Korarchaeota www.science.org/doi/full/10.... #jcampubs
Genomic adaptation strategies to habitat switching in Korarchaeota
The adaptation of Korarchaeota across changing habitats tracks their coevolution with Earth throughout its dynamic history.
www.science.org
January 12, 2026 at 4:17 PM
Reposted by Ian Marshall
ISME20 Abstract guidelines are now available — start preparing your abstract to be able to share your latest research with the global community of microbial ecologists at ISME20, held in New Zealand, August 2026.
Learn more: isme-microbes.org/isme20-abstr...
#ISME20 #MicrobialEcology
December 29, 2025 at 10:42 AM
Tip for identifying LLM-generated text: most humans make subscripts using the subscript formatting tool in their word processor, LLMs use the unicode character for subscript 2 (unicodeplus.com/U+2082) so that formatting is better preserved when they copy and paste.
December 22, 2025 at 8:24 AM
Reposted by Ian Marshall
Landmark study in @Nature! 🇩🇰 The "Microflora Danica" project has created the first-ever national microbiome atlas. Led by Aalborg University, @fwf-at.bsky.social CoE Microplanet's Director @michiwagner4.bsky.social, and @daanspeth.bsky.social, Andrew Giguere @cemess.bsky.social analyzed nitrifiers.
December 4, 2025 at 10:17 AM
Reposted by Ian Marshall
14 two-year postdocs for academics of any nationality who cannot continue their research due to US politics. Do share if you know of such.
Post-doc positions:
"Academic freedom is under pressure today. This requires rescue havens of free research. ... [we] invite early career researchers, whose work is restricted due to political pressure in the USA..."

uni-freiburg.de/frias/call-f...
Call for Applications: Early Career Rescue Fellowship – Freiburg Institute for Advanced Studies
uni-freiburg.de
December 19, 2025 at 5:19 PM
Reposted by Ian Marshall
A quick microbio present before the holidays 🎁 >150 years after their first description, filamentous "Crenothrix bacteria" are now in stable laboratory culture! In our pre-print, we probe the unique physiology & ecology of the "lacustrine" group of these enigmatic methane-oxidizing microbes... 1/2
Isolation of Crenothrix bacteria reveals the distinct ecophysiologies of filamentous methanotrophs and adaptations to redox stress
At the dawn of modern microbiology, Cohn observed abundant filamentous bacteria in drinking water wells that he named Crenothrix polyspora. Subsequent research has revealed the methanotrophic metaboli...
doi.org
December 19, 2025 at 10:21 AM
Reading student writing in 2025 feels like I wished a monkey's paw for perfect grammar and spelling
December 19, 2025 at 8:38 AM
Reposted by Ian Marshall
@isme-microbes.bsky.social offers a great opportunity to publish uncultured microbes via #SeqCode using #genomes as type material. A fantastic step toward embracing the true diversity of microbes! But isolates are also welcome 🧫🔬🦠😁
@seqcode.bsky.social
ISME Communications is expanding its scope to include Taxonomy and Nomenclature, recognizing their essential role in microbial ecology.
Read more: isme-microbes.org/taxonomy-and...
#microbes #taxonomy
December 16, 2025 at 10:00 AM
Reposted by Ian Marshall
💾 Prokka 1.15.6 is released!

This is the last major release of Prokka. But don't be sad, because @oschwengers.bsky.social already has an excellent replacement called Bakta you can migrate to.
#bioinformatics #microbiology #genomics

github.com/tseemann/pro...
Release Heading into the sunset · tseemann/prokka
The future This is probably the last release of Prokka. I won't be making any code changes except bug fixes. I will update the databases occasionally. I strongly recommend you use Bakta by @oschwen...
github.com
December 15, 2025 at 9:09 PM
Thanks to @carlsbergfondet.dk for supporting my Carlsberg Semper Ardens Accelerate project on aerobic methanotrophic bacteria growing anaerobically! www.carlsbergfondet.dk/det-har-vi-s...
Anaerobic growth of aerobic methane-oxidising bacteria (AnGer-MOB) | Carlsbergfondet.dk
www.carlsbergfondet.dk
December 14, 2025 at 10:20 AM
Reposted by Ian Marshall
Reposted by Ian Marshall
It’s exciting to see converging evidence across systems! 😀
Alongside the new work on gutless worms, our study shows that organosulfur cycling is also essential in lucinid holobionts. Lucinid host provides DMSP to its symbionts, sulphur-oxidising Thiodiazotropha and, a new member, Endozoicomonas.
December 8, 2025 at 9:31 AM
Respiratory endosymbionts, that allow their ciliate hosts to breathe nitrate instead of (or in addition to) oxygen are frequent members of the wastewater microbiome. 🦠 🖥️🧬

Great to see this work by @louison-nicolas.bsky.social published in ISME coummuncations!

doi.org/10.1093/isme...
Validate User
doi.org
December 6, 2025 at 10:46 AM
Reposted by Ian Marshall
Oxygen production as an electron overflow pathway in ammonia-oxidizing archaea www.biorxiv.org/content/10.6... #jcampubs
December 4, 2025 at 2:18 PM
Reposted by Ian Marshall
Microflora Danica: What can you learn from collecting and sequencing 10,000+ samples from a single country? Check out our new paper in @nature.com to find out. Incredible work led by Caitlin Singleton, Thomas B. N. Jensen, and Mads Albertsen from @aau.dk. 🦠🧫🧬
www.nature.com/articles/s41...
The Microflora Danica atlas of Danish environmental microbiomes - Nature
Microflora Danica—an atlas of Danish environmental microbiomes—reveals that although human-disturbed habitats have high alpha diversity, species reoccur, revealing hidden homogeneity.
www.nature.com
December 3, 2025 at 8:50 PM
Reposted by Ian Marshall
We're excited to release metaTraits.embl.de! 🦠 Interactively explore 140+ 𝗺𝗶𝗰𝗿𝗼𝗯𝗶𝗮𝗹 𝗽𝗵𝗲𝗻𝗼𝘁𝘆𝗽𝗶𝗰 𝘁𝗿𝗮𝗶𝘁𝘀, harmonized & integrated from culture-derived collections 🔬 & genome-based predictions 🧬 for >2M MAGs & genomes.

Publication at NAR: doi.org/10.1093/nar/... @narjournal.bsky.social #microsky 🧵 1/8
December 2, 2025 at 5:52 PM
Reposted by Ian Marshall
🔬Looking for a student project? We’re looking for students!

👉If you are interested in pursuing a project within electromicrobiology and cable bacteria, then you should check out our student projects on our webside, packed with project ideas. (Link in comment)
November 24, 2025 at 9:29 AM
Just in time for me to cite in something I've been using GlobDB for
Our paper describing the GlobDB is now published in @bioinfoadv.bsky.social
doi.org/10.1093/bioa...

The GlobDB is the largest species dereplicated genome database currently available, containing 306,260 species representatives.
More information on globdb.org 1/5
🖥️🧬🦠
GlobDB: a comprehensive species-dereplicated microbial genome resource
AbstractMotivation. Over the past years, substantial numbers of microbial species’ genomes have been deposited outside of conventional INSDC databases.Resu
doi.org
November 22, 2025 at 9:32 AM
Reposted by Ian Marshall
I feel this. A big part of my professional growth over the last few years has been the realization that I will not live to carry out the vast majority of my ideas. As a result, I'm much more open with sharing them than ever before.
Science is like this too 🧪
I am not aware of a single author who has a shortage of book ideas. Words, yes. Ways to make the ideas become a book, yes. But I've never met an author who doesn't have ideas just raining down all the damn time.
November 19, 2025 at 1:46 PM