Nagissa Mahmoudi
@nagissa.bsky.social
6.8K followers 1K following 290 posts
Associate Professor at McGill University 🇨🇦 Interested in what microbes eat in the ocean and why. #microbes #carbon #biogeochemistry. www.geomicromcgill.com
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nagissa.bsky.social
🚨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...
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
Reposted by Nagissa Mahmoudi
science.org
This year’s #NobelPrize in Chemistry has gone to the architects of molecular “cages” that could be used for everything from carbon capture to drug delivery. https://scim.ag/4mTE1Z6
Architects of molecular cages win Chemistry Nobel
Susumu Kitagawa, Richard Robson, and Omar Yaghi honored for developing metal-organic frameworks
nagissa.bsky.social
Interested in life’s co-evolution with planetary environments?
🌎🦠🧪

I'm looking for a postdoc to join my group at #McGill and happy to sponsor applicants for the TSI fellowship.

Please reach out if interested!

academicjobsonline.org/ajo/jobs/30777
McGill University, Trottier Space Institute
Job #AJO30777, Trottier Space Institute Postdoctoral Fellow, Trottier Space Institute, McGill University, Montreal, Quebec, CA
academicjobsonline.org
Reposted by Nagissa Mahmoudi
copenhaverlab.bsky.social
The @uncchapelhill.bsky.social Department of Biology is searching for tenure-track Assistant Professor in Plant Molecular Biology. Chapel Hill is a wonderful place and Biology is an amazing group of people. To apply, see:
unc.peopleadmin.com/postings/307...
Reposted by Nagissa Mahmoudi
yarrowaxford.bsky.social
New paper! PhD student Mia Tuccillo has uncovered another big impact of past warming in Greenland: lakes lost oxygen for thousands of years and cyanobacteria took over 🦠 🧪 🦠. It's kinda yikes...
With collaborator @geobiomaggie.bsky.social (1/3)
Earth scientists Maggie Osburn and Mia Tuccillo bag up plant samples in a rocky Greenland landscape, with an iceberg-spotted fjord and glacier-covered mountains in the background.
nagissa.bsky.social
Deep ocean microbes are starving but does feeding them fresh carbon make them eat the old stuff?

Our new study shows it doesn’t. The persistence of this carbon appears to come from its chemical stability, not from microbial starvation.

🌊🦠 🧪 #MicroSky #MarineSky

journals.asm.org/doi/epub/10....
Testing the priming effect in the deep ocean: are microorganisms too starved to consume recalcitrant organic carbon?
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journals.asm.org
Reposted by Nagissa Mahmoudi
willgearty.bsky.social
🚨 ‘Earth system engineers’ and the cumulative impact of organisms in deep time
sciencedirect.com/science/arti...

Honored to be among the long author list of this new paper out now in @cp-trendsecolevo.bsky.social that looks to bridge the ecosystem engineering and paleontological literature.
Reposted by Nagissa Mahmoudi
c0nc0rdance.bsky.social
So you're a scientist about to face a government shutdown?

Have you considered becoming a rock star?

It's easy AND profitable! 🎸🧪

Let's list off five scientists who turned rockers:
Reposted by Nagissa Mahmoudi
joannabagniewska.com
🐻🐻🐻🐻
It is finally here.
Fat Bear Week 2025.
🐻🐻🐻🐻

Vote for the fattest, portliest, chubbiest bear of Katmai NP (@fatbearweek.bsky.social). Some of these chonks weigh more than half a ton, and have gained over 100kg since July.

Who will win this year?

Voting is open: explore.org/fat-bear-week
🧪🌍🦊
Chunk the Bear gaining weight between July and September.
nagissa.bsky.social
It’s the woman’s fault that her kid has autism.
Reposted by Nagissa Mahmoudi
meghanazad.bsky.social
🚨 Job Alert! 🚨

We're hiring a Research Project Manager to join our #THRiVElab team at U. Manitoba.

📍 Winnipeg or Remote (in Canada)
💰 Up to $85k
🔗 Apply: www.umanitoba.ca/careers (#38881)
🌐 About us: www.thrivediscovery.ca/staff-positi...

Know someone perfect for this? Please boost or share! 🙏
Reposted by Nagissa Mahmoudi
elife.bsky.social
🌱 Using ‘compelling’ methods, including #CryoET, researchers mapped spinach thylakoid membranes at single-molecule precision, revealing how photosynthetic complexes are organised and settling long-standing debates on chloroplast architecture.
buff.ly/j3TSIkn
Reposted by Nagissa Mahmoudi
scifri.bsky.social
Two years ago, marine researchers discovered a rare deep-sea octopus nursery about 90 miles off Vancouver Island. Now, it could help create Canada’s second-largest marine protected area. 🐙
An Ice-Cold Octopus Nursery Could Help Expand Marine Protections
Indigenous and Western scientists are working together to uncover biodiversity in the icy deep. They're getting some eight-armed help.
buff.ly
Reposted by Nagissa Mahmoudi
caltechipac.bsky.social
The official number of exoplanets has surpassed 6,000! And you can access data on all 6,007 of them right here at IPAC 📈 🪐

Watch the video & read all about the center of the exoplanet universe (also known as NExScI!) here:
www.ipac.caltech.edu/news/the-nas...
nagissa.bsky.social
I got these many years ago. I had to throw out SO much food. They were so hard to get rid of. I still keep most of our pantry foods in glass jars to avoid them.
Reposted by Nagissa Mahmoudi
deepmicrobe.bsky.social
After a long day of discussing future field work to study #DeepSeaMining, this short documentary was a welcome reminder of the why - there is still so much we don’t know about the deep sea! www.youtube.com/watch?v=1jcm...
Nodules: Deep-Sea Life Giver or Key to Our Energy Future?
YouTube video by Scientific American
www.youtube.com
Reposted by Nagissa Mahmoudi
ridetrips.bsky.social
Everyone look at my shiny bacteria that I grew in my microbiology lab.
An eosine methylene blue ager plate testing positive for a lactose fermenting bacteria by turning bright metallic green
Reposted by Nagissa Mahmoudi
sarawickstrom.bsky.social
My lab @mpi-muenster.bsky.social is looking for a computational biologist with a passion for imaging and spatial biology. A staff scientist position with long-term perspective! Apply and spread the word 🙏 jobs.mpi-muenster.mpg.de/jobposting/0...
Computational image analyst (m/f/d)
The Max Planck Institute for Molecular Biomedicine in Münster, Germany, has an opening for a
jobs.mpi-muenster.mpg.de
nagissa.bsky.social
🚨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...
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
Reposted by Nagissa Mahmoudi
chrislintott.bsky.social
If you see headlines claiming NASA's found life on Mars - these are new studies of features in rocks which, if they were on Earth, look like the kind of thing caused by microorganisms. But they could very well - are most probably in fact - be caused by chemistry, not biology.
Reposted by Nagissa Mahmoudi
nagissa.bsky.social
Spending it is actually much worse.