scholarly journals Understanding the emergence of collective motion of microtubules driven by kinesins: role of concentration of microtubules and depletion force

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13191-13197 ◽  
Author(s):  
Ai Saito ◽  
Tamanna Ishrat Farhana ◽  
Arif Md. Rashedul Kabir ◽  
Daisuke Inoue ◽  
Akihiko Konagaya ◽  
...  
Keyword(s):  
Collective Motion ◽  
Depletion Force

scholarly journals Anthony Milner Lane. 27 July 1928—9 February 2011

2020 ◽  
Vol 68 ◽  
pp. 297-314
Author(s):  
Charles Clement
Keyword(s):  
Nuclear Physics ◽  
Collective Motion ◽  
Nuclear Reactions ◽  
Matrix Theory ◽  
Nuclear Data ◽  
Theoretical Physics ◽  
R Matrix ◽  
Good Account ◽  
Advanced Knowledge

Tony Lane came from humble beginnings to become one of the world's leading theoretical nuclear physicists. His career in the Theoretical Physics Division at the Atomic Energy Research Establishment (AERE) at Harwell was characterized by his outstanding successes in explaining experimental nuclear data. He pioneered the understanding of the important nucleon capture reactions by introducing new mechanisms of direct and semi-direct capture and, together with colleagues, he greatly advanced knowledge of nuclear analogue states, and the role of isospin in nuclear physics. With R. G. Thomas, he wrote a comprehensive review of R-matrix theory, applied to analyse resonances in nuclear reactions, which became one of the most cited papers in physics. His book Nuclear theory gave a good account of the use of pairing force theory in nuclear physics, and its application to nuclear collective motion.

scholarly journals Allosteric switch regulates protein–protein binding through collective motion

2016 ◽  
Vol 113 (12) ◽  
pp. 3269-3274 ◽  
Author(s):  
Colin A. Smith ◽  
David Ban ◽  
Supriya Pratihar ◽  
Karin Giller ◽  
Maria Paulat ◽  
...  
Keyword(s):  
Collective Motion ◽  
Protein Domain ◽  
Allosteric Coupling ◽  
Allosteric Communication ◽  
Binding Interface ◽  
Specific Protease ◽  
Ubiquitin Specific Protease ◽  
Promising Avenue

Many biological processes depend on allosteric communication between different parts of a protein, but the role of internal protein motion in propagating signals through the structure remains largely unknown. Through an experimental and computational analysis of the ground state dynamics in ubiquitin, we identify a collective global motion that is specifically linked to a conformational switch distant from the binding interface. This allosteric coupling is also present in crystal structures and is found to facilitate multispecificity, particularly binding to the ubiquitin-specific protease (USP) family of deubiquitinases. The collective motion that enables this allosteric communication does not affect binding through localized changes but, instead, depends on expansion and contraction of the entire protein domain. The characterization of these collective motions represents a promising avenue for finding and manipulating allosteric networks.

Onset of the Portevin-Le Chatelier Effect: Role of Synchronization of Dislocations

2014 ◽  
Vol 783-786 ◽  
pp. 198-203 ◽  
Author(s):  
Tatiana Lebedkina ◽  
Nikolay P. Kobelev ◽  
Mikhail Lebyodkin
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Collective Motion ◽  
Rate Sensitivity ◽  
Plastic Instability ◽  
Strain Rate Range ◽  
Dislocation Dynamics ◽  
Transient Kinetics ◽  
Kinetic Measurements

The problem of the onset of the Portevin-Le Chatelier (PLC) effect is revised by combining a study of the kinetics of the flow stress evolution upon abrupt changes in the applied strain rate and acoustic emission (AE) accompanying plastic deformation of an AlMg alloy. The kinetic measurements allow evaluating the strain-rate sensitivity of the flow stress and the time characteristics of transient processes as functions of plastic strain. Using known criteria of plastic instability, domains of instability are constructed in the (strain, strain rate) plane. A particular accent is put on the strain-rate range corresponding to the so-called “inverse” behavior. The comparison of such maps with experimental data on the critical strain testifies to the insufficiency of these criteria for explaining the onset of the PLC effect. Moreover, the slow transient kinetics contradicts observations of the fast development of stress drops. The AE measurements bear witness that the stress serrations are associated with bursts in duration of acoustic events generated by the collective motion of dislocations. The possible role of synchronization of dislocation dynamics on the onset of plastic instability is discussed.

Fight the flow: the role of shear in artificial rheotaxis for individual and collective motion

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10944-10951 ◽  
Author(s):  
Remmi Baker ◽  
Joshua E. Kauffman ◽  
Abhrajit Laskar ◽  
Oleg E. Shklyaev ◽  
Mykhailo Potomkin ◽  
...  
Keyword(s):  
Collective Motion ◽  
Complex Fluid

To navigate in complex fluid environments, swimming organisms like fish or bacteria often reorient their bodies antiparallel or against the flow, more commonly known as rheotaxis.

scholarly journals Role of Domain Interactions in the Collective Motion of Phosphoglycerate Kinase

2013 ◽  
Vol 104 (3) ◽  
pp. 677-682 ◽  
Author(s):  
Gusztáv Schay ◽  
Levente Herényi ◽  
Judit Fidy ◽  
Szabolcs Osváth
Keyword(s):  
Collective Motion ◽  
Phosphoglycerate Kinase ◽  
Domain Interactions

scholarly journals The role of collective motion in the ultrafast charge transfer in van der Waals heterostructures

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Han Wang ◽  
Junhyeok Bang ◽  
Yiyang Sun ◽  
Liangbo Liang ◽  
Damien West ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Collective Motion ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures ◽  
Ultrafast Charge Transfer

scholarly journals The role of collective motion in examples of coarsening and self-assembly

Soft Matter ◽  
2009 ◽  
Vol 5 (6) ◽  
pp. 1251-1262 ◽  
Author(s):  
Stephen Whitelam ◽  
Edward H. Feng ◽  
Michael F. Hagan ◽  
Phillip L. Geissler
Keyword(s):  
Self Assembly ◽  
Collective Motion

scholarly journals Swarming, swirling and stasis in sequestered bristle-bots

2013 ◽  
Vol 469 (2151) ◽  
pp. 20120637 ◽  
Author(s):  
L. Giomi ◽  
N. Hawley-Weld ◽  
L. Mahadevan
Keyword(s):  
Cell Phone ◽  
Autonomous Agents ◽  
Collective Motion ◽  
Relative Magnitude ◽  
Single Parameter ◽  
Local Interactions ◽  
Substrate Topography ◽  
Space And Time ◽  
Behavioural Repertoire

The collective ability of organisms to move coherently in space and time is ubiquitous in any group of autonomous agents that can move and sense each other and the environment. Here, we investigate the origin of collective motion and its loss using macroscopic self-propelled bristle-bots, simple automata made from a toothbrush and powered by an onboard cell phone vibrator-motor, that can sense each other through shape-dependent local interactions, and can also sense the environment non-locally via the effects of confinement and substrate topography. We show that when bristle-bots are confined to a limited arena with a soft boundary, increasing the density drives a transition from a disordered and uncoordinated motion to organized collective motion either as a swirling cluster or a collective dynamical stasis. This transition is regulated by a single parameter, the relative magnitude of spinning and walking in a single automaton. We explain this using quantitative experiments and simulations that emphasize the role of the agent shape, environment and confinement via boundaries. Our study shows how the behavioural repertoire of these physically interacting automatons controlled by one parameter translates into the mechanical intelligence of swarms.

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