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Guillaume Gaullier

@Guillawme@fediscience.org
  • Open on fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪
Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬
Mostly science posts and chatter in English, occasionally in French.

Born at 356 ppm.

#StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

0 Followers
0 Following
17 Posts
Joined November 04, 2022
Website:
https://www.gaullier.org/en/about
ORCiD:
https://orcid.org/0000-0003-3405-6021
CryoSPARC forum:
https://discuss.cryosparc.com/u/Guillaume/activity
Pronouns:
he/him

Posts

Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · May 07, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @Guillawme@fediscience.org
@GetzlerChem@mstdn.science As I was writing my first answer, I remembered this paper: https://doi.org/10.1038/s41467-023-41444-x Controlled pH change in vitreous ice, with transient melting and rapid re-vitrification to allow a pH-dependent protein conformational change to occur. The very fact that this could work indicates that the initial vitrification did not alter the initial pH too much, at least with this buffer system.
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · May 07, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @GetzlerChem@mstdn.science
@GetzlerChem@mstdn.science The things being vitrified are macromolecules (proteins, DNA, RNA, by themselves or in complexes) from "small" (~30 kDa, big for a chemist I know) to very big (like whole virus particles). And they are always in an aqueous solution with at least a pH buffer system, a bit of salt, and whatever else is necessary to keep the particles "happy" (membrane proteins need detergents or lipid nanodiscs, etc.). These macromolecules have many solvent-exposed groups that can exchange protons. And in general, they denature at extreme pH values. Denaturation isn't a big problem because if proteins fully unfold, we see it during initial imaging and repeat the prep with new conditions until we see them in their native state. I am thinking more about pH-sensitive regulations: conformational changes caused by changes in pH, protonation state of small-molecule ligands causing them to bind differently, etc. Good point about fluorophores being sensitive to temperature. I know some of them work at cryogenic temps because this is how cryoCLEM works (cryo correlative light and electron microscopy: you localize targets by fluorescence microscopy first, then image at higher magnification in an electron microscope), but it could be that only a few work and the pH probes won't. I was hoping to find some literature about this.
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · May 06, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org

Some questions for people into #cryoEM and #biochemistry

All pKa values vary with temperature. This is especially apparent with Tris buffer: change of ~ +0.5 pH unit going from room temp to 4°C.

Proton transfers in acid/base equilibria are very fast. Are they faster than vitrification? In other words, does a change of pKa (due to a rapid drop in temperature) of the buffer compound have the time to change the pH of the solution before it is fully vitrified?

There are pH-sensitive fluorophores. Has anyone vitrified and imaged them in a cryo-confocal microscope to determine whether vitrification changed the pH?

fediscience.org

FediScience.org

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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · May 06, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @annakcroft@scholar.social
@annakcroft @adredish I think crediting reviewers is good! It's making it one more quantitative metric that is bad.
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 21, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @Guillawme@fediscience.org
Looks like human.json isn't mentioned yet on the Indieweb wiki. Would anyone with an account there add a page for it? https://indieweb.org
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 20, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @albertcardona@mathstodon.xyz
@albertcardona@mathstodon.xyz @steveroyle@biologists.social Thanks! I added both your sites to my list. Albert, your file is missing commas to separate the items in the "vouches" array, so the browser extension doesn't parse your file (in fact it doesn't even show there is one on your site, I browsed to it directly and Firefox told me about the missing commas).
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 20, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @leouieda@bertha.social
@leouieda@bertha.social @gedankenstuecke@scholar.social yes this is very fun! It puts people back in the web, since this green dot means something like "someone you know read this and thinks it meets some standards". Much nicer feeling than wondering why something is algorithmically shown to me.
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 20, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org

RE: @quarknova@wikis.world

This is great news! I was in fact just coming to the realization that Wikipedia should be listed in my human.json file, so this resolution comes just at the right time.

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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 19, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @Guillawme@fediscience.org
After I set up human.json on my website yesterday, I figured I also don't post generative AI content on mastodon, and don't use it to code either. So I listed my mastodon and codeberg profiles in my human.json, because why not? It works fine and I like seeing this green dot of the browser extension more often (helps getting used to it!).
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 19, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @gedankenstuecke@scholar.social
@gedankenstuecke@scholar.social @leouieda@bertha.social I just listed both of your sites!
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 19, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @alberto_cottica@mastodon.green
@alberto_cottica@mastodon.green I can see the quoted post's preview. It might depend on how fast difference instances synchronize their posts?
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 18, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @albertcardona@mathstodon.xyz
@albertcardona@mathstodon.xyz I hope it will take off! But that will only solve half of the problem. AI crawlers hammering servers is also a big threat...
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 18, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org

RE: @khinsen@scholar.social

This is an interesting experiment: bring back the old webring/blogroll concept based on trust between people, to help spot websites written by people in an ever deeper sea of generative AI content on the web.

I just added it to my site (linked on my profile), and started building a list of the few sites I read regularly that are unambiguously crafted by humans. Happy to list other people's websites too, so long as they are written without AI, so feel free to point me to your site!

scholar.social

Konrad Hinsen: "In spite of some doubts (so many Web sites questi…" - Scholar Social

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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 18, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @miko@piaille.fr
@miko@piaille.fr J'ai du mal à croire que le cochon ne s'est pas présenté à cette élection. Même quand le loup est suffisamment haut dans les sondages pour nécessiter une alliance de toute la prairie pour le contrer, le cochon est quand même tenté d'ignorer la primaire...
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Mar 17, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org

#AlphaFoldDB now has binary protein complexes!

https://www.ebi.ac.uk/about/news/technology-and-innovation/first-complexes-alphafold-database/

#AlphaFold #AlphaFold2 #StructuralBiology

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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Feb 13, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @boehmax@mastodon.green
@boehmax@mastodon.green oof this seems brutal… what happened to the previous 12 versions? I hope not all desk-rejected without review… Good luck with this one! Hopefully the last. 🤞
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Open post
Guillawme
Guillaume Gaullier @Guillawme@fediscience.org · Feb 05, 2026
Guillaume Gaullier
@Guillawme@fediscience.org

Researcher from 🇫🇷 doing #cryoEM ❄️🔬 at Uppsala University 🇸🇪 Working on cyanobacterial carboxysomes 🦠, still interested in nucleosome 🧬🙃🧬 Mostly science posts and chatter in English, occasionally in French. Born at 356 ppm. #StructuralBiology #Biochemistry #Science #AcademicChatter #fedi22

fediscience.org
Replying to @aeryn_thrace@mastodon.social
@aeryn_thrace@mastodon.social The fact that papers are used to measure researchers against each other for career advancement seems like a big obstacle to the necessary changes you describe, unfortunately. I agree with you that an actionable and collective "knowledge system" is better than a pile of PDFs, but a bigger reform of how academia functions might be required first.
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