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otticroze.bsky.social
Otti Croze
@otticroze.bsky.social
280 followers 280 following 46 posts
Biophysicist/math biologist (Newcastle University) working on microswimmers and the physics of microbes 🦠; passionate about nature and sustainability ♻️; mental health advocate; he/him/his; opinions personal.
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Feb 26
Hi Bluesky, my name is Otti and I am a biophysicist working on the theoretical and experimental biophysics of swimming microbes and microbial interactions. My research is inspired by applications to sustainability and environmental science. #Biophysics #MathBio #Microswimmers #ActiveMatter
Drawing showin a swimming microalga with two anterior flagella interacting with a bacterium with multiple posterior flagella. The interaction is via the exchange of nutrients
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 2d
That's very cool, thanks for the videos!
otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 4d
Good luck finding a PhD candidate!
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 4d
That's very cool. Do they crawl on surfaces in the amoeboid phase and become planktonic in the flagellated phase? Fascinating stuff. Must read more about it.
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Reposted by Otti Croze
katrinavelle.bsky.social
Katrina Velle @katrinavelle.bsky.social · 5d
PhD or Master's position available for Fall 2026!

Interested in how actin drives cell crawling, eating, dividing, or osmoregulation? What about pathogenesis of a brain-eating amoeba? Or eukaryotic evolution? If so, apply through my website: katrinavelle.wixsite.com/science/cont...
Please share!
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 5d
What is the biflagellate pictured?
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Reposted by Otti Croze
royalsociety.org
The Royal Society @royalsociety.org · 12d
Our Dorothy Hodgkin Fellowships are still open for applications. This scheme offers a first step into an independent research career for outstanding early career scientists who require flexible working circumstances.

#RSGrants

https://royalsociety.org/grants/dorothy-hodgkin-fellowship/
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 17d
Fantastic! Well done Bryony!
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Reposted by Otti Croze
otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 29d
First paper by @jasonbains.bsky.social (proud supervisor moment!) & @finnegansquark.bsky.social. We predict the drift velocity of bacterial populations in spatio-temporally varying chemical environments, e.g. the rhizosphere 🌱 doi.org/10.1098/rsta... 🧵(1/3)

🙏 #Bioactive #Fluids theme issue editors
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Reposted by Otti Croze
luke-mathphys.bsky.social
Luke Davis @luke-mathphys.bsky.social · 29d
New preprint! :) : "Insertion space of repulsive active matter". We show that the presence of activity, weak or strong, increases the total insertion volume and its connectedness. Our work extends equilibrium concepts of stochastic geometry to active systems. arxiv.org/pdf/2509.081...
#ActiveMatter
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Reposted by Otti Croze
mathsmaret.bsky.social
Smitha Maretvadakethope (she/her) @mathsmaret.bsky.social · 29d
Our special issue of Phil Trans Roy Soc A on "Biological Fluid Dynamics" Emerging Directions" is officially out now! Originating from discussions at one of our SIG meetings, this special issue has 16 research articles and reviews on all things bioactive! royalsocietypublishing.org/toc/rsta/202...
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences: Vol 383, No 2304
royalsocietypublishing.org
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 29d
...to simulate a population of chemotactic bacteria responding to a single decaying (see video above) or oscillating pulses. Our framework can be used to describe bacterial dynamics in the environment, e.g. around lysed algae in the ocean or around roots in the soil (3/3)
otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 29d
We used Monte Carlo simulations to generate bacterial trajectories in spatial and temporal gradients from which we calculated a chemotactic drift velocity. We then proposed an ansatz for the drift velocity, which well describes the simulations. This ansatz can be used in continuum models... (2/3)
Heat map plot of the chemotactic drift velocity as a function of spatial (horizontal axis) and temporal (vertical axis) gradients. A bar to the right of the graph shows the magnitude of the velocity.
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · 29d
First paper by @jasonbains.bsky.social (proud supervisor moment!) & @finnegansquark.bsky.social. We predict the drift velocity of bacterial populations in spatio-temporally varying chemical environments, e.g. the rhizosphere 🌱 doi.org/10.1098/rsta... 🧵(1/3)

🙏 #Bioactive #Fluids theme issue editors
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Sep 6
It would be nice if in digit.party you could ask to see the optimal arrangement of numbers corresponding to 100% of max. When I score less than 100% I am sometimes left wondering @vatter.bsky.social #MathGames #DigitParty 1️⃣2️⃣3️⃣4️⃣5️⃣6️⃣7️⃣8️⃣9️⃣
digit.party
match numbers, score points. daily challenge + random boards
digit.party
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Reposted by Otti Croze
otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Sep 4
Fluid dynamicists of #Bluesky, can you suggest some companies doing exciting fluid dynamics in the UK and worldwide, and who regularly employ maths and physics graduates? #FluidDynamics #FYFD #GraduateCareers #STEM
Visualisation of the flow around a circular object using a Hele Shaw cell. Streamlines can be seen avoiding the object
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Sep 4
I'm intrigued 🐬🦄
alexandermorozov.bsky.social
Alexander Morozov @alexandermorozov.bsky.social · Sep 4
Have you ever wondered what narwhals and blessings have to do with viscoelastic flows? Our latest preprint has it all :)

arxiv.org/abs/2509.03175
Narwhals and their blessings: exact coherent structures of elastic turbulence in channel flows
Solutions of long, flexible polymer molecules are complex fluids that simultaneously exhibit fluid-like and solid-like behaviour. When subjected to external flows, dilute polymer solutions develop ela...
arxiv.org
otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Sep 4
Fluid dynamicists of #Bluesky, can you suggest some companies doing exciting fluid dynamics in the UK and worldwide, and who regularly employ maths and physics graduates? #FluidDynamics #FYFD #GraduateCareers #STEM
Visualisation of the flow around a circular object using a Hele Shaw cell. Streamlines can be seen avoiding the object
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Reposted by Otti Croze
kehelliwell.bsky.social
Katherine Helliwell @kehelliwell.bsky.social · Sep 2
How do diatoms cope with nitrogen and phosphorus colimitation? — Happy to share our new paper:

"Nitrogen status exerts dynamic control over phosphorus sensing and acquisition via PSR1 in colimited marine diatoms"
🔗 doi.org/10.1126/scia...

@exetermarine.bsky.social @thembauk.bsky.social
Nitrogen status exerts dynamic control over phosphorus sensing and acquisition via PSR1 in colimited marine diatoms
Diatoms exert reciprocal, fine-scale control of P acquisition by N availability, depending on the immediate needs of the cell.
doi.org
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Reposted by Otti Croze
caseywdunn.bsky.social
Casey Dunn @caseywdunn.bsky.social · Aug 28
I hope to take a PhD student in 2026 to study siphonophores. Please reach out if you are interested in applying this fall. For examples of recent lab projects see www.sciencedirect.com/science/arti... and academic.oup.com/gbe/article/...
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Reposted by Otti Croze
oritpeleg.bsky.social
Orit Peleg @oritpeleg.bsky.social · Aug 26
New paper in PLOS Biology: as we raise the difficulty of our 3D printed puzzles, bees keep landing on combs with ever stranger hexagonal order! 🐝

Led by the brilliant Golnar Gharooni Fard, in collaboration with CK Prasanna & FL Jiménez

journals.plos.org/plosbiology/...
Close-up of experimental honeycombs built after a challenging 3D printed setup, showing mostly hexagonal cells.
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Reposted by Otti Croze
royalsociety.org
The Royal Society @royalsociety.org · Aug 25
Anne Warner FRS was born #OnThisDay in 1940. Warner’s primary area of research was morphogenesis, the study of the biological process that causes an organism to develop its shape. She became a Fellow of the Royal Society in 1985.

#WomenInSTEM
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Reposted by Otti Croze
rigb.org
Royal Institution @rigb.org · Aug 14
If you can peel an orange in one piece like this, then you can make an Euler spiral 🍊

Alison from our Masterclasses team explains the maths of turning spheres into flat surfaces. 🧪
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Reposted by Otti Croze
nicoschramma.bsky.social
Nico Schramma @nicoschramma.bsky.social · Aug 22
Upcoming Symposium!

Physics of Adaptation and Decision making in Biology!

When: September 16
Where: Amsterdam, The Netherlands
Join us here: www.fluidlab.nl/padm25

Speakers:
Ray Goldstein, Sujit Datta, @thomasshimizu.bsky.social, @mirnakramar.bsky.social, @blarson.bsky.social, me
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otticroze.bsky.social
Otti Croze @otticroze.bsky.social · Aug 23
I don't need much convincing about the complex behaviour of protists, but nevertheless: mind blown! Great work. How general do you think this is?
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Reposted by Otti Croze
micromotility.bsky.social
Kirsty Wan @micromotility.bsky.social · Aug 12
So you think you understand everything about #Chlamydomonas photoresponses? think again! #protists #behaviour #cilia

To explain how Chlamy switches handedness from swimming in CCW circles in low-light to CW in high-light... see our new preprint led by Alan Tsang (HKU) 👇
doi.org/10.1101/2025...
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