All articles tagged with #biomechanics
Researchers used microneedles to stress the mammalian mitotic spindle during cell division and found the spindle self-stabilizes under force: damaged midsections are reinforced by more stable microtubule segments, with EB1 tagging marking repair sites. This mechanism helps the spindle withstand the forces of chromosome separation and could inspire resilient designs in engineering.
A team describes the ballista spider (Propostira sp.) from Cape York, Australia, which builds a spring-loaded conical snare that is triggered by the green tree ant (Oecophylla smaragdina). The spider yanks ants into its core web at accelerations up to 1,367 m/s^2, then wraps and consumes them. The silk snare stores about 78 kJ per kilogram and can deliver roughly 11.7 MW of power, outperforming other known biological catapults. This extreme prey specialization and predation mechanism may rely on pheromones to attract the ants and represents a remarkable biomechanical adaptation.
Across studies in Spain and Japan, as well as with people walking alone, humans show a consistent counterclockwise bias when moving in open spaces, not explained by culture or handedness; stronger in children, suggesting a biomechanical or neural basis with possible public-space design implications.
An international study published in Nature Communications finds people show a modest but consistent bias to turn left (counterclockwise) when walking, persisting across cultures, spaces, and even solo experiments. The bias is stronger in younger participants and does not depend on dominant hand, sex, or eye movement; researchers ruled out explanations like the Coriolis effect or large-scale forces, pointing to a possible biomechanical basis. The finding could influence the design of evacuation routes and crowd-flow planning in airports, museums, stadiums, and other crowded spaces, with future work including VR testing and cross-species comparisons.
A Nature Communications study across Spain and Japan found that people—whether alone, in crowds, or in schools—tend to turn counterclockwise when changing direction, suggesting a biologically rooted symmetry-breaking rather than a social habit. The bias persisted across cultures and was even stronger in nursery children, with a minority who favored clockwise or showed no bias. While intriguing, researchers caution it is not a universal law and plan follow-up work with virtual reality and more complex scenarios (e.g., emergencies) to uncover origins and applications in crowded spaces.
New experiments show people naturally drift counterclockwise when walking in crowds, a bias observed in Spain and Japan across genders and ages (more pronounced in children). The reason remains unclear, but understanding it could improve crowd and evacuation simulations and the design of everyday spaces.
Researchers show human sperm and algae like Chlamydomonas propel through viscous fluids by internal energy creating traveling waves via odd elasticity, a non-reciprocal response that can overcome the scallop theorem; the odd elastohydrodynamics framework separates internal flagellar forces from external drag and could inspire bio‑inspired micro‑robots.
A yearlong randomized trial found that individualized gait retraining—adjusting foot angle by a personalized amount to reduce knee loading—significantly reduced knee pain and slowed cartilage deterioration in medial knee osteoarthritis, with results comparable to pain medications. The six-week training used vibration feedback to help participants maintain their new walking pattern, and after a year participants stayed close to their prescribed angles. While promising, the approach requires specialized gait assessment and is not yet ready for wide clinical use; future delivery could involve wearable sensors or clinic-based PT.
New fossil-based research argues that Tyrannosaurus rex forelimbs were vestigial—short and not suited for grappling prey—likely evolving for balance or limited support rather than hunting, with the massive skull and jaws doing the heavy lifting.
At a Charlotte training facility, Atlanta Dream players wore sensors, force plates, and dozens of cameras to map every movement and shot detail, illustrating basketball’s shift toward biomechanical, data-driven training in an elite laboratory setting.
A Royal Society Open Science study re-evaluates T. rex locomotion, concluding the giant predator used a toe-first, digitigrade gait similar to an ostrich, which raises its top speed estimates to about 11–25 mph and prompts museums and films to rethink depictions.
New research suggests the heart’s rhythmic beating creates mechanical strain that suppresses cancer growth in heart tissue. In mouse experiments, non‑beating transplanted hearts rapidly developed cancer, while beating native hearts largely resisted it and restricted cancer to the outer layers; engineered heart tissue that beat only when stimulated with calcium showed a similar pattern. This mechanical effect could help explain why heart tumors are extraordinarily rare in mammals.
UT Dallas and UT Southwestern researchers found that colon tissue from younger colorectal cancer patients is abnormally stiff due to fibrotic collagen, in both tumor and nearby healthy tissue, and experiments with cells on stiff substrates and patient-derived organoids show stiffness promotes faster cancer growth; the study suggests biomechanical forces may contribute to rising cases of early-onset colorectal cancer and could guide future diagnosis and therapy, published in Advanced Science.
A 2026 study shows cats right themselves midair not with a single motion but via sequential trunk rotation: a flexible thoracic spine twists first, followed by a stiffer lumbar spine, enabling reorientation under angular momentum. Cadaver spines revealed the thoracic region has about three times the range of motion of the lumbar region and a thoracic neutral zone around 47 degrees, while lumbar spines had little to no neutral zone. In live tests, two cats dropped from about 1 meter showed the front half rotated about 70–90 milliseconds before the hind half. The researchers caution rib-cage cutting may affect measurements but findings align with earlier work and offer new insight into mammalian locomotion and agility; published in The Anatomical Record (2026).
New research shows that growing tissues crack and reform through controlled, constructive fractures that sculpt embryos and organs—fluid-driven fractures between cells form cavities in mouse zygotes to create the blastocyst, fracture-guided formation of zebrafish heart trabeculae, and similar cracking patterns in elephant skin—revealing physics as a fundamental driver of development and evolution.