Dr. Oliver Demuth
@OliverDemuth
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Junior Research Fellow - Earth Sciences @ClareCollege | Professional Scientific Illustrator | PhD @Cambridge_Uni | MSc @BristolPalaeo | BA @ZHdK | 🇨🇭 in 🇬🇧
Cambridge, England
Joined September 2016
I’m now happy to share my first postdoc work in its final, peer-reviewed version published in @FunEcology ! A huge thank-you again to @fieldpalaeo @LizzySteell @OliverDemuth Anne-Claire Fabre and to @snsf_ch
https://t.co/PvLKtIdZPP
besjournals.onlinelibrary.wiley.com
Read the free Plain Language Summary for this article on the Journal blog.
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✅ Michael Heseltine draws a direct line between the fascist movements of 1930s and today’s far-right surge across Europe and the UK. He reminds readers that post-war peace and prosperity were built through European cooperation, not isolation. Heseltine calls Farage’s rhetoric
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RVC XROMM at work again! (with cadavers, not live birds)
We captured the joint motion of Red legged partridge specimens using XROMM (X-Ray reconstruction of moving morphology) and wiggled three specimens in the biplanar X-ray to capture their joint mobility 3/11
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The below video is in realtime! Dynamic ROM simulations run at >7 FPS. Static ROM simulations run at >130 FPS(!). Each simulation setup can also be parallelised (across multiple Maya instances; i.e., diferrent Maya scenes) and run from the terminal/command prompt!
This made simulations more complicated, as previous pipelines often assumed a static joint centre around which the distal element (e.g., humerus) moves. However our approach automatically optimises joint translations for each rotational joint orientation and it is very fast! 5/11
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PhD position available at the Museum für Naturkunde in Berlin on avialan ontogeny (birds and their closest non-avian dinosaur relatives)! https://t.co/fkQz03qi9B
jobs.museumfuernaturkunde.berlin
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All code (with instructions) is available on my GitHub: https://t.co/ljexMch3jP and on Zenodo (with additional data): https://t.co/FIbxSRHwtR. If you have any questions I am more than happy to help and explain the workflow/pipeline! 11/11
zenodo.org
Initial release of the Python code for the signed distance field-based simulations in Autodesk Maya: Estimation of joint range of motion via optimisation of joint translations. Estimation of 3D...
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These simulations can not only be used to measure the lengths in experimental data, but can also constrain osteological ROM measurements to receive more functionally informative ROM estimates. Importantly, they are applicable to all type of joints and even fossils! 10/11
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We calculated ligaments across the whole XROMM dataset and compared them to lengths measuared through dissection. It appears that different ligaments have different amounts of elasticity. Potential differences in (primary?) functions? 9/11
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Similar to the osteological ROM simulation we used a signed distance field representation of the bones to speed up the optimisation process. The minimal length of each ligament was calculated from origin to insertion without any way points intersecting the bones 8/11
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We were not only interested in the osteological range of motion (ROM) but also in the soft tissues constraints surrounding the joint. We simulated the ligaments of the shoulder capsule that prevent excessive movement while enabling contact between the bones during motion 7/11
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Our approach is similar to work by @ErinCSLee ( https://t.co/ETdEhcqQKH) but implemented in @AdskMaya w/ Python. The optimisation approach minimises a cost function that determines joint proximity (cartilage thickness) and congruency (overlap) over a signed distance field 6/11
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This made simulations more complicated, as previous pipelines often assumed a static joint centre around which the distal element (e.g., humerus) moves. However our approach automatically optimises joint translations for each rotational joint orientation and it is very fast! 5/11
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In the shoulder we captured both joint rotations and translations. Our results clearly show that there is no (functional) joint centre in the bird shoulder and the humerus moves dynamically over the glenoid articular cartilage. The joint does not act as a spherical joint 4/11
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We captured the joint motion of Red legged partridge specimens using XROMM (X-Ray reconstruction of moving morphology) and wiggled three specimens in the biplanar X-ray to capture their joint mobility 3/11
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How do joints move? The articular surfaces between the proximal and distal bones are in contact during motion. However, they are usually not neatly spherical or hinge like but move in complex patterns that include sliding and/or rolling (e.g., in the shoulder joint of birds) 2/11
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Last week our in press manuscript was made available at @J_Exp_Biol with the typeset version following soon. We conducted ex vivo XROMM experiments to determine the joint mobility in Red legged partridges and compared them with in silico simulations: https://t.co/33aRrQTxwB 1/11
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Wonderful research by our MSc Human Behaviour and Evolution student at #ESHE2025 🦍 🐒 Emma's project compared muscle architectural properties across the hindlimb of many primate species 🐒🦍
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📢ARTIST REQUIRED📢Love working with young people & families? We're seeking an artist/facilitator to lead some workshops & create an art installation, film or animation, on the theme of climate change & the Ice Ages! Apply by Mon 6 Oct 🙂@camunivmuseums
https://t.co/4zJNBVbibT
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If this plan is implemented, it will cripple British universities and health care, and tear apart families. All 'skilled' immigrants will require £60k salary & cannot use NHS. Permanent residence will be scrapped entirely. Citizenship made insanely hard. https://t.co/HYJ2d9MkEl
theguardian.com
Reform UK plans to force non-citizens to apply for visas, with high salary thresholds and no access to NHS services
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