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Posts by Nagissa Mahmoudi

Video

Absolutely incredible.

NASA Astronaut Reid Wiseman, who commanded Artemis II, took this footage from the far side of the Moon with his iPhone.

Watch with sound on.

2 days ago 15847 4725 303 554

This may be the stupidest climate denial talking point of all time

1 week ago 581 174 65 10

Join us in Montreal for the Canada/US Northeast hub!

I will give a talk and @gmdouglas.bsky.social @nagissa.bsky.social & Tim Blower will surely give *great talks*

Opportunities for student talks and posters and a good time guaranteed!

1 week ago 9 6 0 0
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Carbon monoxide metabolism in freshwater anaerobic methanotrophic archaea - Nature Communications Anaerobic methane-oxidizing archaea mitigate methane emissions in anoxic environments. Here, Egas et al. show that these microbes can also oxidize carbon monoxide, prompting re-evaluation of their cla...

Grab a coffee and enjoy reading up on CO metabolism in methanotrophs!

Freshwater ANME (own work):
www.nature.com/articles/s41...
Marine ANME (@Orphan lab):
www.nature.com/articles/s41...

Big thanks to our collaborators at QUT!
@sjmcilroy.bsky.social (Heyu/Andy/Gene!) @cuwelte.bsky.social

1 week ago 29 17 2 2
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Canadians Visiting U.S. By Car Down 35% In 2 Years Now 14 months in, Canada’s rejection of the U.S. is the most successful tourism boycott in memory.

Now 14 months in, Canada’s rejection of the U.S. is the most successful tourism boycott in memory.

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Video

"Planet Earth: You. Are. A. Crew."

Artemis II mission specialist Christina Koch reflects on what it means to be a "crew."

1 week ago 506 149 19 51
Species-specific oxygen sensing governs the initiation of vertebrate limb regeneration Why mammals cannot regenerate limbs like amphibians do presents a long-standing puzzle in biology. To uncover the underlying differences, we compared amputation responses of embryonic mouse (Mus musculus) and Xenopus laevis tadpole limbs. Lowering ...

🚨 Why can’t mammals regenerate limbs like frog tadpoles or salamanders?
In our new paper in @science.org , we show that species-specific oxygen sensing acts as a gatekeeper for initiating limb regeneration 🐭🐸
🔗 www.science.org/doi/10.1126/... #EvoDevo

1 week ago 262 111 21 10
Earthset captured through the Orion spacecraft window at 6:41 p.m. EDT, April 6, 2026, during the Artemis II crew’s flyby of the Moon. A muted blue Earth with bright white clouds sets behind the cratered lunar surface. The dark portion of Earth is experiencing nighttime. On Earth’s day side, swirling clouds are visible over the Australia and Oceania region.  In the foreground, Ohm crater has terraced edges and a flat floor interrupted by central peaks. Central peaks form in complex craters when the lunar surface, liquefied on impact, splashes upwards during the crater’s formation.
[alt text from NASA]

Earthset captured through the Orion spacecraft window at 6:41 p.m. EDT, April 6, 2026, during the Artemis II crew’s flyby of the Moon. A muted blue Earth with bright white clouds sets behind the cratered lunar surface. The dark portion of Earth is experiencing nighttime. On Earth’s day side, swirling clouds are visible over the Australia and Oceania region. In the foreground, Ohm crater has terraced edges and a flat floor interrupted by central peaks. Central peaks form in complex craters when the lunar surface, liquefied on impact, splashes upwards during the crater’s formation. [alt text from NASA]

#Artemis II lunar flyby images are showing up! 😍

A crescent Earth setting behind the Moon.

2 weeks ago 3820 888 35 73

I can send some…whereabouts are you?

2 weeks ago 0 0 1 0
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Cultivating the Ancestors… in Motion What electron microscope images hint at, but can only be seen in videos: how 'Asgard' archaea move.

Cultivating the Ancestors… in Motion

What electron microscope images hint at, but can only be seen in videos: how 'Asgard' archaea move.

4 weeks ago 17 10 0 1
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New paper in mSystems! 🧵 - how much of your metagenome is actually bacterial/archaeal DNA? For many samples, nobody knows.

We built SingleM prokaryotic_fraction (SPF) to answer this, then ran it on >100,000 public metagenomes. 🧬🖥️🦠

Here's what we found 👇
doi.org/10.1128/msystems.01062-25

4 weeks ago 47 28 1 2
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Canadian researcher Gerry Wright is searching for the next generation of life-saving antibiotics More than 5 million deaths every year are caused by or linked to superbugs

I ❤️ this @theglobeandmail.com piece on @gdwantibiotics.bsky.social. Such a beautiful story about his drive to discover new antibiotics against all odds, a tribute to his global leadership, not to mention the many trainee careers he has launched. So honoured to have been hired by this great man. #AMR

1 month ago 18 4 2 0

Anyone who says that has not been to Yellowstone NP.

1 month ago 2 0 0 0
East Sands beach, St Andrews, in the sunshine (which happens more often than you probably think!)

East Sands beach, St Andrews, in the sunshine (which happens more often than you probably think!)

Chair in Earth Sciences position @uniofstandrews.bsky.social closing soon - Monday 23 March.

Very broad remit, so if you’d like to join our lovely school, and get to live in the super beautiful and friendly wee nation of Scotland, please apply!

www.st-andrews.ac.uk/earth-scienc...

⚒️🌊🧪

1 month ago 58 34 0 3
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Video appears to show U.S. cruise missile striking Iranian school compound The seven-second video was released by Iranian state media and directly contradicts statements made by President Trump, who said Iran was responsible for the strike.

The Iranian girls’ school was hit by a US tomahawk cruise missile. NPR has confirmed the footage.

1 month ago 2110 826 41 124
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Viruses in marine sediments: a review of their effect on biogeochemistry and microbial interactions | Applied and Environmental Microbiology In the ocean, viruses are known to mediate the carbon cycle, keeping dissolved organic carbon (DOC) in the microbial loop and preventing its movement into secondary consumers (1). However, few direct ...

New paper out! We sat down and compiled all viral work in marine sediments. The water column has been getting a second look for viral interactions, its time for sediment to have the same!
journals.asm.org/doi/10.1128/...

1 month ago 50 19 3 1
PNAS Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...

Check out our new paper on how temperature modulates the iron requirement of nitrifying bacteria - these guys are critical in the ocean nitrogen cycle as they recycle oxidised forms of N. But to do this they need a lot of iron. 🌊

www.pnas.org/doi/abs/10.1...

1 month ago 10 3 0 0

Ahhh yes, the geopolitical version of champagne: if it’s not officially declared, it’s just a sparkling military operation.

1 month ago 6 1 0 0

Thrilled to share that our preprint has been accepted in Science Advances! Grateful to an incredible team & collaborators.

Link: www.science.org/doi/10.1126/...

👏 @annaferraioli.bsky.social @maikekittelmann.bsky.social
@msarscentre.bsky.social @erc.europa.eu @hfspo.bsky.social #ctenophores

1 month ago 69 17 2 2
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That's correct...not a mass extinction. The paper you shared describes a potential decrease in primary productivity, meaning reduced growth of photosynthetic microbes in the surface ocean.

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If you ever want to read a paper for free and can't find it otherwise, email the lead author and politely ask for a copy. You will not be bothering the person. You will in fact make their whole entire day. I have had scientists get so excited I asked they sent me everything they ever published.

1 month ago 2801 989 17 40

Alex, the answer is: what is creating new terrorist groups?

1 month ago 2 0 0 0

Much of the anaerobic microbial life was not wiped out by the GOE…particularly on the time scale of the oxygenation which occurred over hundreds of millions of years. Those anaerobic microbes just moved to deeper parts of the ocean which remained anoxic for while after the GOE.

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Yikes.

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Post image Post image Post image

In collaboration with @aslo.org , @tosoceanography.bsky.social, we thank you for a successful #OSM26!

See you at #OSM28 27 February–3 March, Vancouver, Canada 🇨🇦!

📷 Cred: Bianca Otero

1 month ago 16 7 0 0
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The boys’ club: How Epstein’s influence shaped the exclusion of women in STEM In one email, an AI researcher suggested it’s “hard to be brilliant if you are worrying if you look fat or why another woman hates you.”

The trove of files released by the Department of Justice, illuminates Epstein’s deep interest and entrenchment in the scientific community.

But the files also underscore how he used his power and money in ways that kept women out of places where they might succeed. https://bit.ly/4qWgPLz

1 month ago 664 303 20 51

The Epstein files document what many women researchers have long experienced but rarely seen laid bare so starkly: exclusion operating behind closed doors, shaping who gets funded, invited, mentored, and taken seriously. How many of these networks, norms, and gatekeepers remain in place?

1 month ago 4442 1806 46 58
Video

Scientists have seen Asgard archaea crawling for the first time. When it comes to the origin of eukaryotes, this is like seeing a feathered dinosaur in the wild. (Video courtesy of Philipp Ralder)

2 months ago 473 138 10 19
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A pilot in a submersible vehicle collecting sediments samples in 30 meters of water looking for Asgards (microbial relatives of eukaryotes)

A pilot in a submersible vehicle collecting sediments samples in 30 meters of water looking for Asgards (microbial relatives of eukaryotes)

One of the biggest questions in biology is how complex cells evolved about 2 billion years ago. Here's my new story on how scientists are solving the mystery of eukaryotes like us. Gift link: nyti.ms/4qMbo22

2 months ago 341 105 9 9
Zintellect - National Aeronautics and Space Administration (NASA) - ICAR - OxyMoRon: Understanding dioxygen production and consumption in apparently anoxic environments - 0042-NPP-MAR26-ABProg-Astrobi... About the NASA Postdoctoral Program The NASA Postdoctoral Program (NPP) offers unique research opportunities to highly-talented scientists to engage in ong

Come work with us on #darkoxygen as part of the NASA Postdoctoral Fellowship Program. It is an amazing opportunity to get up to 3 years of funding. Deadlines are March 1. and November 1. Happy to discuss your ideas! Details here: zintellect.com/Opportunity/...

@mblscience.bsky.social #astrobiology

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