Nagissa Mahmoudi
@nagissa.bsky.social
Associate Professor at McGill University 🇨🇦
Interested in what microbes eat in the ocean and why. #microbes #carbon #biogeochemistry.
www.geomicromcgill.com
Interested in what microbes eat in the ocean and why. #microbes #carbon #biogeochemistry.
www.geomicromcgill.com
Pinned
Nagissa Mahmoudi
@nagissa.bsky.social
· Sep 12
Microbial exoenzymes catalyzed the transition to an oxygenated Earth
Microbial exoenzymes, extracellular enzymes secreted to degrade complex organic polymers, are essential for recycling carbon and nutrients, thus sustaining primary productivity in todays oceans. Yet, ...
www.biorxiv.org
🚨New preprint from our lab!🚨
We trace the evolution of microbial exoenzymes and uncover their role in Earth’s oxygenation. By recycling nutrients, exoenzymes helped fuel cyanobacteria and set off feedbacks that sustained the long-term rise of O₂.
#MicroSky 🧪 🦠 🌎
www.biorxiv.org/content/10.1...
We trace the evolution of microbial exoenzymes and uncover their role in Earth’s oxygenation. By recycling nutrients, exoenzymes helped fuel cyanobacteria and set off feedbacks that sustained the long-term rise of O₂.
#MicroSky 🧪 🦠 🌎
www.biorxiv.org/content/10.1...
Interested in being my colleague at #McGill?
We are recruiting researchers currently working abroad through the new Canada Impact+Research Chairs program.
Email me or DM for more details.
www.canada.ca/en/impact-pl...
We are recruiting researchers currently working abroad through the new Canada Impact+Research Chairs program.
Email me or DM for more details.
www.canada.ca/en/impact-pl...
Application process - Canada.ca
www.canada.ca
January 6, 2026 at 1:15 PM
Interested in being my colleague at #McGill?
We are recruiting researchers currently working abroad through the new Canada Impact+Research Chairs program.
Email me or DM for more details.
www.canada.ca/en/impact-pl...
We are recruiting researchers currently working abroad through the new Canada Impact+Research Chairs program.
Email me or DM for more details.
www.canada.ca/en/impact-pl...
Reposted by Nagissa Mahmoudi
Why should scientists write op-eds? It's tempting to say the facts ought to speak for themselves. But the facts are largely whispering among themselves in the scientific literature. They need us to give them a voice. How? Advice in my latest @natchem.nature.com Thesis rdcu.be/eJlGL #chemsky 1/3
Opinionated science
Nature Chemistry - When the facts can’t speak for themselves, scientists can give them a voice, argues Michelle Francl.
rdcu.be
October 6, 2025 at 2:26 PM
Why should scientists write op-eds? It's tempting to say the facts ought to speak for themselves. But the facts are largely whispering among themselves in the scientific literature. They need us to give them a voice. How? Advice in my latest @natchem.nature.com Thesis rdcu.be/eJlGL #chemsky 1/3
Reposted by Nagissa Mahmoudi
The tragedy is all of this was totally forseeable.
January 3, 2026 at 10:23 AM
The tragedy is all of this was totally forseeable.
Reposted by Nagissa Mahmoudi
Know an undergraduate looking for an opportunity to get paid to do cryospheric or other geoscience research this summer? Let them know about the GT EAS Broadening Participation REU here in Atlanta. Now accepting applications through ETAP! easreu.eas.gatech.edu
Georgia Tech EAS REU Program - Summer 2025 | EAS Research Experience for Undergraduates (REU)
easreu.eas.gatech.edu
January 1, 2026 at 9:54 PM
Know an undergraduate looking for an opportunity to get paid to do cryospheric or other geoscience research this summer? Let them know about the GT EAS Broadening Participation REU here in Atlanta. Now accepting applications through ETAP! easreu.eas.gatech.edu
Reposted by Nagissa Mahmoudi
NYC Mayor-Elect Zohran Mamdani sworn into office
January 1, 2026 at 5:41 AM
NYC Mayor-Elect Zohran Mamdani sworn into office
Reposted by Nagissa Mahmoudi
Multidisciplinary training, over time, produces the highest impact people
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Recent discoveries on the acquisition of the highest levels of human performance
Scientists have long debated the origins of exceptional human achievements. This literature review summarizes recent evidence from multiple domains on the acquisition of world-class performance. We re...
www.science.org
December 20, 2025 at 11:49 PM
Multidisciplinary training, over time, produces the highest impact people
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Reposted by Nagissa Mahmoudi
Join us for a critical conversation on the future of U.S. atmospheric science.
UCAR President Antonio Busalacchi hosts this town hall on what’s at stake if NSF NCAR is dismantled.
buff.ly/jR6tGwo
UCAR President Antonio Busalacchi hosts this town hall on what’s at stake if NSF NCAR is dismantled.
buff.ly/jR6tGwo
December 18, 2025 at 3:17 PM
Join us for a critical conversation on the future of U.S. atmospheric science.
UCAR President Antonio Busalacchi hosts this town hall on what’s at stake if NSF NCAR is dismantled.
buff.ly/jR6tGwo
UCAR President Antonio Busalacchi hosts this town hall on what’s at stake if NSF NCAR is dismantled.
buff.ly/jR6tGwo
Reposted by Nagissa Mahmoudi
Reposted by Nagissa Mahmoudi
This is an amazing position, DCI Lausanne is looking for a new director! It is one of the best cryoEM centers out there, with an fantastic infrastructure and some of the most exceptional experts in microscopy that I ever had the chance to work with!
careers.epfl.ch/job/Lausanne...
careers.epfl.ch/job/Lausanne...
Operations Director of DCI-Lausanne
Operations Director of DCI-Lausanne
careers.epfl.ch
December 17, 2025 at 1:32 PM
This is an amazing position, DCI Lausanne is looking for a new director! It is one of the best cryoEM centers out there, with an fantastic infrastructure and some of the most exceptional experts in microscopy that I ever had the chance to work with!
careers.epfl.ch/job/Lausanne...
careers.epfl.ch/job/Lausanne...
Reposted by Nagissa Mahmoudi
Timelapse walking the entire length of the conference center at the AGU meeting. 0.52 miles, 9 min 54 sec… in case people are wondering.. #agu25
December 15, 2025 at 3:29 AM
Timelapse walking the entire length of the conference center at the AGU meeting. 0.52 miles, 9 min 54 sec… in case people are wondering.. #agu25
Reposted by Nagissa Mahmoudi
Are you a long-time fan of Archaea, an extremophile-phile, or are you simply curious?
Either way, we have good news.
We’re delighted to announce the 2026 EMBO Workshop on Archaea, 6–10 July.
Sign up: meetings.embo.org/event/26-arc...
We look forward to seeing you in Cambridge, UK.
Please repost!
Either way, we have good news.
We’re delighted to announce the 2026 EMBO Workshop on Archaea, 6–10 July.
Sign up: meetings.embo.org/event/26-arc...
We look forward to seeing you in Cambridge, UK.
Please repost!
Molecular Biology of Archaea: Life Through the Prism of Archaea
In 1977, Woese and colleagues revealed Archaea as a distinct domain of life. Building on this insight, the discovery of Asgard archaea has strengthened the view that many hallmarks of eukaryotic cell…
meetings.embo.org
December 16, 2025 at 12:00 PM
Are you a long-time fan of Archaea, an extremophile-phile, or are you simply curious?
Either way, we have good news.
We’re delighted to announce the 2026 EMBO Workshop on Archaea, 6–10 July.
Sign up: meetings.embo.org/event/26-arc...
We look forward to seeing you in Cambridge, UK.
Please repost!
Either way, we have good news.
We’re delighted to announce the 2026 EMBO Workshop on Archaea, 6–10 July.
Sign up: meetings.embo.org/event/26-arc...
We look forward to seeing you in Cambridge, UK.
Please repost!
Reposted by Nagissa Mahmoudi
Hey cool! If you want to know some amazing stuff about life on Earth (technically, INSIDE Earth, but I think it still counts), you might enjoy reading my book.
We're thrilled to see five of our books featured in @wsj.com's Holiday Gift Guide this holiday season! 🎉🎁
Learn more about each of these beautiful books: press.princeton.edu/books?search...
Learn more about each of these beautiful books: press.princeton.edu/books?search...
December 17, 2025 at 6:26 AM
Hey cool! If you want to know some amazing stuff about life on Earth (technically, INSIDE Earth, but I think it still counts), you might enjoy reading my book.
Reposted by Nagissa Mahmoudi
Attendance at US-based science conferences is bouncing around this year but generally down. #AGU25 has ~10k fewer this year! I explored these trends for @nature.com — including solutions to keep conferences local & productive:
www.nature.com/articles/d41...
🧪
www.nature.com/articles/d41...
🧪
Scientists skip key US meetings — and seize on smaller alternatives
Researchers are devising creative ways to get together as Trump’s policies curb travel to US gatherings.
www.nature.com
December 16, 2025 at 5:18 PM
Attendance at US-based science conferences is bouncing around this year but generally down. #AGU25 has ~10k fewer this year! I explored these trends for @nature.com — including solutions to keep conferences local & productive:
www.nature.com/articles/d41...
🧪
www.nature.com/articles/d41...
🧪
Reposted by Nagissa Mahmoudi
New preprint out! Using ~75k environmental OTUs + 77 fossil calibrations, we reconstructed a Proterozoic timeline of eukaryote evolution. Our results show crown eukaryotes were already diversifying >1.6 Ga, long before the first undisputed fossils (~1.05 Ga).
🔗 DOI: www.biorxiv.org/content/10.6...
🔗 DOI: www.biorxiv.org/content/10.6...
December 15, 2025 at 8:19 AM
New preprint out! Using ~75k environmental OTUs + 77 fossil calibrations, we reconstructed a Proterozoic timeline of eukaryote evolution. Our results show crown eukaryotes were already diversifying >1.6 Ga, long before the first undisputed fossils (~1.05 Ga).
🔗 DOI: www.biorxiv.org/content/10.6...
🔗 DOI: www.biorxiv.org/content/10.6...
Reposted by Nagissa Mahmoudi
#AGU25 travel tip - if landing at MSY, take a taxi rather than rideshare to the convention center area, it’s a flat $36 for 1-2 people and you can avoid the Uber pickup chaos.
December 14, 2025 at 11:45 PM
#AGU25 travel tip - if landing at MSY, take a taxi rather than rideshare to the convention center area, it’s a flat $36 for 1-2 people and you can avoid the Uber pickup chaos.
Reposted by Nagissa Mahmoudi
And stick around Friday morning #AGU25 oral session to hear from federal, industry, and academic partners on accelerating understanding of the deep sea to inform decision making, including updates on #eDNA tools, microbial processes, seabed minerals, mapping, and more! agu.confex.com/agu/agu25/me...
December 14, 2025 at 8:56 PM
And stick around Friday morning #AGU25 oral session to hear from federal, industry, and academic partners on accelerating understanding of the deep sea to inform decision making, including updates on #eDNA tools, microbial processes, seabed minerals, mapping, and more! agu.confex.com/agu/agu25/me...
Reposted by Nagissa Mahmoudi
Then Tuesday of #AGU25, join the COBRA team and partners for an evening town hall (free food!!) to learn about opportunities to accelerate deep sea science to inform decision making! 🌊🧪🧑🏻🔬⛴️🎉 cobra.bigelow.org/cobra-town-h...
December 14, 2025 at 8:51 PM
Then Tuesday of #AGU25, join the COBRA team and partners for an evening town hall (free food!!) to learn about opportunities to accelerate deep sea science to inform decision making! 🌊🧪🧑🏻🔬⛴️🎉 cobra.bigelow.org/cobra-town-h...
Reposted by Nagissa Mahmoudi
Do you love to write code or teach others about data-centered Earth Systems Science? Interested in the interplay of science and data? The NSF Unidata Summer Internship program is looking for you! Apply by February 6, 2026 to work with us next summer: buff.ly/5nsLdRu
December 12, 2025 at 12:39 AM
Do you love to write code or teach others about data-centered Earth Systems Science? Interested in the interplay of science and data? The NSF Unidata Summer Internship program is looking for you! Apply by February 6, 2026 to work with us next summer: buff.ly/5nsLdRu
Reposted by Nagissa Mahmoudi
NSF
- Forced reorg
- POs down ~ 40% (DRP, most rotators not renewed, retirements)
- Forced move (and we have to pack and clean) to a building with no furniture, little to no conference space for panels, inadequate 🛜, …)
I personally love the boxes they gave us for packing.
“Details matter” 🙃
- Forced reorg
- POs down ~ 40% (DRP, most rotators not renewed, retirements)
- Forced move (and we have to pack and clean) to a building with no furniture, little to no conference space for panels, inadequate 🛜, …)
I personally love the boxes they gave us for packing.
“Details matter” 🙃
December 11, 2025 at 11:16 AM
NSF
- Forced reorg
- POs down ~ 40% (DRP, most rotators not renewed, retirements)
- Forced move (and we have to pack and clean) to a building with no furniture, little to no conference space for panels, inadequate 🛜, …)
I personally love the boxes they gave us for packing.
“Details matter” 🙃
- Forced reorg
- POs down ~ 40% (DRP, most rotators not renewed, retirements)
- Forced move (and we have to pack and clean) to a building with no furniture, little to no conference space for panels, inadequate 🛜, …)
I personally love the boxes they gave us for packing.
“Details matter” 🙃
Reposted by Nagissa Mahmoudi
A female wolf has been doing something unusual on the Central Coast of British Columbia. She's learned to pull crab traps up from the water, yanking on a rope to bring it to the surface. But is it tool use? Very fun story from @phiejacobs.bsky.social for @science.org
Have wild wolves learned to use tools?
Video captures a lone female pulling crab traps out of the water, but does it count as tool use?
www.science.org
November 17, 2025 at 7:53 PM
A female wolf has been doing something unusual on the Central Coast of British Columbia. She's learned to pull crab traps up from the water, yanking on a rope to bring it to the surface. But is it tool use? Very fun story from @phiejacobs.bsky.social for @science.org
Reposted by Nagissa Mahmoudi
Congratulations to the 2025 recipient of the Volvo Prize, @naomioreskes.bsky.social! Naomi's work addresses vital issues such as why we need to trust science; a topic that becomes even more important with every new day.
Read more here: www.environment-prize.com/laureates/na...
Read more here: www.environment-prize.com/laureates/na...
Why we should trust scientists
Many of the world's biggest problems require asking questions of scientists -- but why should we believe what they say? Historian of science Naomi Oreskes thinks deeply about our relationship to belie...
www.ted.com
November 2, 2025 at 8:40 PM
Congratulations to the 2025 recipient of the Volvo Prize, @naomioreskes.bsky.social! Naomi's work addresses vital issues such as why we need to trust science; a topic that becomes even more important with every new day.
Read more here: www.environment-prize.com/laureates/na...
Read more here: www.environment-prize.com/laureates/na...
Reposted by Nagissa Mahmoudi
both are right: the best is marine microbiology
November 2, 2025 at 5:47 PM
both are right: the best is marine microbiology
Reposted by Nagissa Mahmoudi
🌊 A pandemic-era breakthrough has allowed scientists to literally expand our view of plankton. By using ultrastructure expansion microscopy, researchers visualised the inner workings of hundreds of marine species for the first time
www.sciencedaily.com/releases/202...
www.sciencedaily.com/releases/202...
A new microscopy breakthrough is revealing the oceans’ invisible life
A pandemic-era breakthrough has allowed scientists to literally expand our view of plankton. By using ultrastructure expansion microscopy, researchers visualized the inner workings of hundreds of mari...
www.sciencedaily.com
November 2, 2025 at 5:53 PM
🌊 A pandemic-era breakthrough has allowed scientists to literally expand our view of plankton. By using ultrastructure expansion microscopy, researchers visualised the inner workings of hundreds of marine species for the first time
www.sciencedaily.com/releases/202...
www.sciencedaily.com/releases/202...
Reposted by Nagissa Mahmoudi
I want to see the particles that sink carbon to the deep ocean, all the time and in real time.This summer we built an instrument that collects images of sinking particles every second, and visualizes them in 5 different ways. @mbarinews.bsky.social
youtu.be/4xXGlnCoik8
youtu.be/4xXGlnCoik8
How MBARI scientists are studying the ocean’s carbon flux in real time
YouTube video by MBARI (Monterey Bay Aquarium Research Institute)
youtu.be
November 2, 2025 at 6:41 PM
I want to see the particles that sink carbon to the deep ocean, all the time and in real time.This summer we built an instrument that collects images of sinking particles every second, and visualizes them in 5 different ways. @mbarinews.bsky.social
youtu.be/4xXGlnCoik8
youtu.be/4xXGlnCoik8