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Posts by Pierre Osteil

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These images show live embryos of animals (jellyfish, crustacean, worm, sea urchin, sea squirt, beetle) and one of animals closest single-celled relatives. They were captured taking advantage of fluorescent proteins localised on the outer membrane of cells, allowing us to observe cell outlines. 1/9

2 days ago 183 53 4 5
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Mosaic gastruloids reveal a temporal restriction for developmental cell competition - Nature Cell Biology Frenster et al. utilize mosaic mouse gastruloids as a model of cell fitness and competition, identifying a temporal window between primed pluripotency and early gastrulation during which cell competit...

🥳 I am happy to share our latest manuscript published in @natcellbio.nature.com We use #Gastruloids to study #CellCompetition during early mammalian development and find not only that this is highly pronounced in our system but also tightly restricted in time. (1/12) www.nature.com/articles/s41...

3 weeks ago 69 22 6 0

Peut-être mais pas dans un futur proche. Et l'IA est déjà présente dans nos évaluations. Donc les solutions pour le moment sont celles-ci. En tout cas je n'en voit pas d'autre et, en tant qu'enseignant, j'aimerais avoir des pistes.

3 weeks ago 1 0 1 0

Bien d'accord. Mais l'examen par présentations orales ou devoirs sur table va redevenir la norme. Fin des devoirs à la maison. Par contre je ne vois pas comment enlever les notes.

3 weeks ago 0 0 1 0

Je suis d'accord sur le principe, les approches par compétences peuvent être une alternative mais dans un monde où les places sont limitées en Master, comment ferions-nous pour sélectionner les 400+ candidatures, chaque années, sans les notes?

3 weeks ago 1 0 1 0
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U.S. government has lost more than 10,000 STEM Ph.D.s since Trump took office A Science analysis reveals how many were fired, retired, or quit across 14 agencies

The Trump regime got rid of 10,109 PhDs in science and related fields, representing 14% of the total number of PhD scientists in the federal workforce.

2 months ago 492 248 4 15
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Early encouraging UC Davis trial data on cell therapy for spina bifida - The Niche Stem cell biologist discusses a new Lancet paper describing early results on a cell therapy for spina bifida.

Good news for a Friday. Early encouraging @UCDavisHealth trial data on cell therapy for spina bifida ipscell.com/2026/03/earl... #stemcells #regenerative #medicine

1 month ago 4 2 0 0
Picture J. Zakany

Picture J. Zakany

Vendredi prochain 6 mars à 10h, début de mon cours 2026 @college-de-france.fr. Les relations conflictuelles entre les variations de l’ADN et l’évolution des structures🤓 L’ADN; cause proximale ou cause ultime? 🤔 Entrée libre, sortie libre! Amis Parisiens, 🙏RT 🤘

1 month ago 12 7 0 1
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Equity, Diversity and Inclusion: Four women whose pioneering contributions to science have been largely overlooked Ethel Browne Harvey, Hilde Pröscholdt Mangold, Ida Henrietta Hyde and Marthe Gautier all made important contributions to developmental biology, but their names are largely absent from histories of sci...

elifesciences.org/articles/110...

2 months ago 0 0 0 0
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U.S. government has lost more than 10,000 STEM Ph.D.s since Trump took office A Science analysis reveals how many were fired, retired, or quit across 14 agencies

Wow. This is devastating.

www.science.org/content/arti...

2 months ago 1626 797 31 71
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a man is looking at a wall of monitors on make a gif ALT: a man is looking at a wall of monitors on make a gif
3 months ago 0 0 0 0
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Using fluorescence live imaging and an in vitro implantation model, we show that human embryo attachment begins with direct cell fusion via syncytin-2–MFSD2A interaction.
With @hansclevers.bsky.social.
Great work by @tnoordzij.bsky.social & @martinacelotti.bsky.social
www.biorxiv.org/content/10.6...

3 months ago 48 17 1 1
A still picture from the 1961 documentary on zebrafish development by J.V. Durden showing a 1 dpf zebrafish embryo.

A still picture from the 1961 documentary on zebrafish development by J.V. Durden showing a 1 dpf zebrafish embryo.

I was today years old when I learned that there is a superb (freely available) documentary from 1961 on early zebrafish development by J.V. Durden. collection.nfb.ca/film/embryon... (1/2)

4 months ago 28 12 2 1
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Such a treat to be sitting in the room where @denisduboule.bsky.social is giving a talk @fsscr.bsky.social meeting in Lyon! Exciting and insightful science ahead 🤯🤘

5 months ago 13 3 0 2
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Cadherins modulate the self-organizing potential of pseudo-embryos Gastruloids derived from ES cells mimic embryonic patterning through robust self-organization. Mayran et al. uncover that this competence depends on a cadherin switch regulated by Snai1-driven E-cadhe...

Happy to present the final version of our Cadherin and gastruloid manuscript, online at @cp-cellreports.bsky.social.
www.cell.com/cell-reports...
Initially in BiorXiv (www.biorxiv.org/content/10.1...) 1/12

5 months ago 44 16 4 1

Must read S.J. Gould "Wonderful Life" for all the details about the Burgess Shale and how it changes our understanding of evolution 🐚🪸🦀. Also great to get how science works. One of my favourite science books!! 📚

5 months ago 1 0 0 0
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Tomorrow Wednesday 29th at 11am, lesson #3 of @neilshubin.bsky.social guest Professor @college-de-france.fr on ‘The evolutionary origin of bones and teeth’. The second lesson is available @ www.youtube.com/watch?v=0B6y... . No registration, Free access, dentures accepted.

5 months ago 19 10 1 0
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Nearly 20 Percent Fewer International Students Traveled to the U.S. in August The data shows the steepest decline in August international student arrivals since the pandemic.

The number of international students arriving in the U.S. in August fell by 19% this year compared with last year — the largest decline on record outside of the pandemic.

6 months ago 401 136 40 24

Superbes images! @pflenne.bsky.social

6 months ago 0 0 0 0
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Réponse de l'image-mystère :

Pas de cellules de convection dans une étoile ici, mais, à une toute autre échelle, un organoïdes (amas de cellules) issus de cellules souches embryonnaires destiné à mimer (et mieux comprendre) ce développement précoce de l'embryon.

www.insb.cnrs.fr/fr/cnrsinfo/...

6 months ago 32 4 2 1
Image d'un téléphone sur lequel se trouve le logo et le nom de Bluesky.
En arrière-plan, un papillon blanc sur fond bleu

Image d'un téléphone sur lequel se trouve le logo et le nom de Bluesky. En arrière-plan, un papillon blanc sur fond bleu

Suite à la migration de scientifiques et d'universitaires de X, Bluesky est devenue une l'une des alternatives.

Afin d'évaluer sa viabilité/pertinence pour la communication scientifique, cette étude présente une analyse à grande échelle de la diffusion d'articles scientifiques sur Bluesky.

1/5

6 months ago 294 148 7 7

RAPPEL 📢 [Paris - jeudi 25 sept. à 19h00] Thérapies manuelles : où en est la science ?
Ostéopathie, kinésithérapie, chiropraxie, étiopathie
Une conférence animée par Sylvain Peterlongo, kinésithérapeute, accueillie par la mairie du 5ème arr. de Paris, et organisée par l’Afis !

6 months ago 7 3 0 0
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You asked for it! We delivered Quack-O-Grams to our members of Congress urging them to #ImpeachRFK, and get that Quack out of office!

There's still time for you to get in on this fluffy, feathery action: Send your own duck at zurl.co/W1ZnB and keep the momentum going! 🦆

7 months ago 1010 355 30 63

La vengeance des homéopathes...

7 months ago 1 0 0 0
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Afis Science - Association française pour l’information scientifique Luc Julia a mené une carrière aux États-Unis chez Apple, Hewlett-Packard et dans plusieurs start-ups de la Silicon Valley avant de devenir en 2012 (…)

"La controverse autour de Luc Julia sur l’intelligence artificielle", par Jean-Paul Krivine, rédacteur en chef de Science & pseudo-sciences.

7 months ago 28 14 0 3

Congrats Can!

7 months ago 2 0 1 0
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Comme ne le disait pas Einstein… / Afis Science - Association française pour l’information scientifique La vie, c’est comme une bicyclette, il faut avancer pour ne pas perdre l’équilibre.[1] Albert Einstein Albert Einstein est un des scientifiques les (…)

Vous aussi ça vous agace les citations bidons d'Einstein pour appuyer une opinion préconçue?
www.afis.org/Comme-ne-le-...

7 months ago 9 2 2 0

Jiankui He + Church + Colossal... What can go wrong...

8 months ago 2 1 0 0

@carlbergstrom.com @jevinwest.bsky.social may have a good word for this kind of problem.

8 months ago 0 0 0 0
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