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Ian Marshall

@ianpgm.bsky.social

Associate Professor at Department of Biology, Aarhus University, Denmark πŸ‡©πŸ‡° working on microbial genomics, bioinformatics, cable bacteria, and other sediment microorganisms. https://www.au.dk/en/ianpgm@bio.au.dk/ πŸ‡¦πŸ‡Ί

516 Followers  |  716 Following  |  165 Posts  |  Joined: 27.12.2023
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Posts by Ian Marshall (@ianpgm.bsky.social)

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And The Microbes

OH MY GOSH I JUST FOUND THIS πŸ˜ƒ

www.andthemicrobes.org

#comic #bacteria #phage #plasmids 🦠

25.02.2026 11:24 β€” πŸ‘ 12    πŸ” 4    πŸ’¬ 0    πŸ“Œ 0

14 more days left to apply for these two PhD positions in my team. Please share with your network!

17.02.2026 09:31 β€” πŸ‘ 6    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0

14 more days left to apply for these two postdoc positions in my team. Please share with your network!

17.02.2026 09:30 β€” πŸ‘ 6    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0

"Previously in this class we used Prokka by @torstenseemann.bsky.social to annotate bacterial genomes. This always gave me an excuse to show an adorable picture of my daughter next to a quokka when she was a baby. Unfortunately, we are now using Bakta by @oschwengers.bsky.social."

12.02.2026 07:46 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Please share!

PhD position at the University of Copenhagen. Start date: 1st of June!
Β 
The project integrates field work, RNAseq, MALDI-MSI & FISH to explore composition, regulation, andΒ resilienceΒ of termite host-gut symbiont metabolism.
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πŸ‘‰Β employment.ku.dk/phd?show=156...
Β 
⏳ Deadline 23/2/26

11.02.2026 19:39 β€” πŸ‘ 21    πŸ” 26    πŸ’¬ 1    πŸ“Œ 1
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Postdoc in Archaea Microbiology - Vacancy at Aarhus University Vacancy at Department of Biology - Microbiology, Aarhus University

Postdoc position on Asgard archaea in Thiago’s new lab for someone well trained in biochemistry, cloning, and protein purification:
international.au.dk/about/profil...

10.02.2026 14:36 β€” πŸ‘ 16    πŸ” 15    πŸ’¬ 0    πŸ“Œ 1
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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, ...

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...

02.02.2026 21:57 β€” πŸ‘ 15    πŸ” 14    πŸ’¬ 0    πŸ“Œ 0

Regnormsekskrementer = earthworm excrement, right?

23.01.2026 12:45 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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

Highly efficient bio-catalytic oxygen reduction coupled to long-range electron transport in cable bacteria www.biorxiv.org/content/10.6... #jcampubs

21.01.2026 19:11 β€” πŸ‘ 6    πŸ” 5    πŸ’¬ 0    πŸ“Œ 0

Me too...

21.01.2026 11:57 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Headline: "Scientists discover emperor penguin colony in Antarctica using satellite images"

Headline: "Scientists discover emperor penguin colony in Antarctica using satellite images"

Yesterday it was cows using tools, today its penguins using satellite imagery.

20.01.2026 18:44 β€” πŸ‘ 9152    πŸ” 2373    πŸ’¬ 145    πŸ“Œ 203

Oh that's cool, I'd never heard of shuf before. Neat exercise to try in other languages too, I just procrastinated from my real work by doing it in Julia:

using Random
shuffle(broadcast(*,["2" "3" "4" "5" "6" "7" "8" "9" "10" "J" "Q" "K" "A"],["β™ ","β™₯","♦","♣"]))

21.01.2026 07:36 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Uncovering hidden phylo- and ecogenomic diversity of the widespread methanotrophic genus Methylobacter The genus Methylobacter is far more diverse and ecologically versatile than previously recognized, comprising over 30 putative species with distinct genomi

Uncovering hidden phylo: and ecogenomic diversity of the widespread methanotrophic genus Methylobacter
#microbiology #methane #bacteria #MicroSky
@femsmicro.org @femsjournals.bsky.social
doi.org/10.1093/fems...

18.01.2026 19:16 β€” πŸ‘ 10    πŸ” 6    πŸ’¬ 1    πŸ“Œ 0
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LPSN wird ELIXIR Core Data Resource! Zentrale Liste fΓΌr Mikroben-Namen – einfach & topaktuell fΓΌr Forscher. Check it: tinyurl.com/bddz9mew

#Mikrobenforschung #Wissenschaft #ELIXIR #Bio

16.01.2026 09:57 β€” πŸ‘ 2    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0
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Genomic adaptation strategies to habitat switching in Korarchaeota The adaptation of Korarchaeota across changing habitats tracks their coevolution with Earth throughout its dynamic history.

Genomic adaptation strategies to habitat switching in Korarchaeota www.science.org/doi/full/10.... #jcampubs

12.01.2026 16:17 β€” πŸ‘ 10    πŸ” 7    πŸ’¬ 0    πŸ“Œ 0
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ISME20 Abstract guidelines are now available β€” 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

29.12.2025 10:42 β€” πŸ‘ 14    πŸ” 7    πŸ’¬ 0    πŸ“Œ 0

@jakemckinlay.bsky.social's book "A Bacterium in Bangladesh" was awesome, not sure if he could do something like this for someone else...

28.12.2025 09:58 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
2 U+0032 DIGIT TWO

2 U+0032 DIGIT TWO

2 U+2082 SUBSCRIPT TWO

2 U+2082 SUBSCRIPT TWO

Copy and paste into www.fontspace.com/unicode/anal... to see which one was used.

22.12.2025 08:26 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
H2O vs Hβ‚‚O written in Word, demonstrating the difference between formatting as subscript and using the Unicode character for subscript 2.

H2O vs Hβ‚‚O written in Word, demonstrating the difference between formatting as subscript and using the Unicode character for subscript 2.

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.

22.12.2025 08:24 β€” πŸ‘ 6    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0
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Landmark study in @Nature! πŸ‡©πŸ‡° 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.

04.12.2025 10:17 β€” πŸ‘ 16    πŸ” 5    πŸ’¬ 1    πŸ“Œ 0

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.

19.12.2025 17:19 β€” πŸ‘ 359    πŸ” 369    πŸ’¬ 1    πŸ“Œ 5
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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...

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

19.12.2025 10:21 β€” πŸ‘ 12    πŸ” 9    πŸ’¬ 2    πŸ“Œ 0

Reading student writing in 2025 feels like I wished a monkey's paw for perfect grammar and spelling

19.12.2025 08:38 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@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 πŸ§«πŸ”¬πŸ¦ πŸ˜
@seqcode.bsky.social

16.12.2025 10:00 β€” πŸ‘ 6    πŸ” 7    πŸ’¬ 0    πŸ“Œ 0
Release Heading into the sunset Β· 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...

πŸ’Ύ 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...

15.12.2025 21:09 β€” πŸ‘ 117    πŸ” 60    πŸ’¬ 3    πŸ“Œ 2
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Anaerobic growth of aerobic methane-oxidising bacteria (AnGer-MOB) | Carlsbergfondet.dk

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...

14.12.2025 10:20 β€” πŸ‘ 13    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
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TheΒ Microflora Danica atlas of Danish environmental microbiomes - Nature Microflora Danicaβ€”an atlas of Danish environmental microbiomesβ€”reveals that although human-disturbed habitats have high alpha diversity, species reoccur, revealing hidden homogeneity.

The Microflora Danica atlas of Danish environmental microbiomes www.nature.com/articles/s41... #jcampubs

11.12.2025 06:23 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

It’s exciting to see converging evidence across systems! πŸ˜€
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.

08.12.2025 09:31 β€” πŸ‘ 14    πŸ” 8    πŸ’¬ 5    πŸ“Œ 1

Congratulations @louison-nicolas.bsky.social !

06.12.2025 10:46 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Oxygen production as an electron overflow pathway in ammonia-oxidizing archaea www.biorxiv.org/content/10.6... #jcampubs

04.12.2025 14:18 β€” πŸ‘ 10    πŸ” 8    πŸ’¬ 0    πŸ“Œ 0