scholarly journals Synchronized oscillations in swarms of nematode Turbatrix aceti

Soft Matter ◽  
2022 ◽  
Author(s):  
Anton Peshkov ◽  
Sonia McGaffigan ◽  
Alice Quillen

There is a recent surge of interest in the behavior of active particles that can at the same time align their direction of movement and synchronize their oscillations, known as...

Author(s):  
I Ketut Sukada ◽  
I Nyoman Tirta Ariana ◽  
I Gede Suarta

A turtle security that was released their habitat in conserving, it was determined by their speed and agility to swimming and diving at avoiding predators even chasing prey to be eaten. The most an important part of turtle organs for agile swimming and diving was a flipper. Flippers forward more function as paddles when swimming and diving while the rear flippers serves as a rudder to steer the direction of movement of swimming and diving. The front flippers are unlike paddle when swimming and diving, whereas, the back flippers as a rudder at direction when swimming and diving. At front flippers, there was belong a strong nails for ripping or tearing their prey, therefore, it was easy eaten. The study was intended to know a feeding effect of lemuru and seaweed on different percentage towards length plastron correlation to in front length flippers both. An experiment material that was used in the research was 75 ridley turtles, having by the ranch turtle, PT. Moncot Sari, located in Desa Tanjung Benoa, South Kuta subdistrict, Badung regency. The experiments were designed using RAL, the analysis of correlation, regression, and data processing applied Costat Statistics. The research results were obtained the highest long plastron average rows on treatment E: 36.4 cm, D: 28.7 cm, A: 28,6 cm, B: 27.6 cm and C: 26.6 (P <0.01), a length plastron correlation and regression towards long front flippers were significant both front and back. A length plastron correlation (X) with front flippers r = 0.7768, b = 03 223 and a = 18.2499 very significant (p <0:01), whereas, the correlation between long front flippers (X) and long back flippers r = 0.6346 , b = 0.9814, a = 14.6368 highly significant (P <0.01).


2015 ◽  
Vol 51 (91) ◽  
pp. 16381-16384 ◽  
Author(s):  
Yuelong Xin ◽  
Liya Qi ◽  
Yiwei Zhang ◽  
Zicheng Zuo ◽  
Henghui Zhou ◽  
...  

A novel organic solvent-assisted freeze-drying pathway, which can effectively protect and uniformly distribute active particles, is developed to fabricate a free-standing Li2MnO3·LiNi1/3Co1/3Mn1/3O2 (LR)/rGO electrode on a large scale.


2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Abdallah Daddi-Moussa-Ider ◽  
Hartmut Löwen ◽  
Benno Liebchen

AbstractAs compared to the well explored problem of how to steer a macroscopic agent, like an airplane or a moon lander, to optimally reach a target, optimal navigation strategies for microswimmers experiencing hydrodynamic interactions with walls and obstacles are far-less understood. Here, we systematically explore this problem and show that the characteristic microswimmer-flow-field crucially influences the navigation strategy required to reach a target in the fastest way. The resulting optimal trajectories can have remarkable and non-intuitive shapes, which qualitatively differ from those of dry active particles or motile macroagents. Our results provide insights into the role of hydrodynamics and fluctuations on optimal navigation at the microscale, and suggest that microorganisms might have survival advantages when strategically controlling their distance to remote walls.


2021 ◽  
Vol 82 (6) ◽  
Author(s):  
Pawan Kumar ◽  
Jing Li ◽  
Christina Surulescu

AbstractGliomas are primary brain tumors with a high invasive potential and infiltrative spread. Among them, glioblastoma multiforme (GBM) exhibits microvascular hyperplasia and pronounced necrosis triggered by hypoxia. Histological samples showing garland-like hypercellular structures (so-called pseudopalisades) centered around the occlusion site of a capillary are typical for GBM and hint on poor prognosis of patient survival. We propose a multiscale modeling approach in the kinetic theory of active particles framework and deduce by an upscaling process a reaction-diffusion model with repellent pH-taxis. We prove existence of a unique global bounded classical solution for a version of the obtained macroscopic system and investigate the asymptotic behavior of the solution. Moreover, we study two different types of scaling and compare the behavior of the obtained macroscopic PDEs by way of simulations. These show that patterns (not necessarily of Turing type), including pseudopalisades, can be formed for some parameter ranges, in accordance with the tumor grade. This is true when the PDEs are obtained via parabolic scaling (undirected tissue), while no such patterns are observed for the PDEs arising by a hyperbolic limit (directed tissue). This suggests that brain tissue might be undirected - at least as far as glioma migration is concerned. We also investigate two different ways of including cell level descriptions of response to hypoxia and the way they are related .


Soft Matter ◽  
2021 ◽  
Author(s):  
Claudio Maggi ◽  
Matteo Paoluzzi ◽  
Andrea Crisanti ◽  
Emanuela Zaccarelli ◽  
Nicoletta Gnan

We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the systems critical behaviour close to the critical point...


2018 ◽  
Vol 3 (3) ◽  
Author(s):  
Y. Ibrahim ◽  
R. Golestanian ◽  
T. B. Liverpool
Keyword(s):  

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