Results 61 to 70 of about 29,835 (313)

The Mechanism of Transcription Stalling under Torsion [PDF]

Biophysical Journal, 2015
During transcription, RNA polymerase (RNAP) translocates along DNA and introduces torsional stress, and excessive torque accumulation can lead to transcription stalling. We previously measured this stall torque for E. coli RNAP during transcription1. However the mechanism and regulation of RNAP stalling under torsion has remained elusive.
Tan, Chuang, Ma, Jie, Bird, Jeremy G., Inman, James T., Roberts, Jeffrey W., Wang, Michelle D.   +5 more
openaire   +1 more source

The viscoelastic properties of rubber under a complex loading [PDF]

, 2010
PhDThis thesis aims to explore the effect of pre-strain on the viscoelastic behaviour of rubber materials. There are various conflicting theories in the literature regarding the strain dependence and resulting anisotropy of the viscoelastic behaviour ...
Suphadon, Nutthanun
core  

Neurovascular Contacts in the Pathophysiology of Neuralgic Amyotrophy: An Observational Study

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Neuralgic amyotrophy (NA) is a prevalent, monophasic, multifocal immune‐mediated neuropathy. A distinctive characteristic of the disease is the occurrence of nerve or fascicle constrictions and torsions (NA‐associated focal nerve lesions, NAFL). The pathophysiology underlying this phenomenon remains to be fully elucidated.
Johannes Fabian Holle, Andreas Leha, Volker Limmroth, Wolfram Windisch, Maximilian Zimmermann   +4 more
wiley   +1 more source

Pre‐Torsion Tubular Metamaterials: Multi‐Effect Integration for Advanced Functional Applications

Advanced Science
Mechanical metamaterials continuously push the boundaries of mechanical properties far beyond conventional materials. However, a critical step toward the applications of metamaterials lies in combining multiple effects and functionalities into a single ...
Xuegang Zhang, Jianfei Yin, Xin Ren, Jie Wu, Yang Wang, Xingchi Teng, Wei Jiang, Dong Han, Xihai Ni, Yi Zhang, Dianlong Yu, Jihong Wen   +11 more
doaj   +1 more source

Torsional strain-induced microstructural control in magnesium alloys: A pathway to enhanced mechanical performance

Materials & Design
To achieve a strength-ductility synergy in extruded ZM6 magnesium alloy, three torsion-dominated heterogeneous plastic deformation processes were proposed. The deformation mechanisms and the evolution of microstructure, texture, twin volume fraction (TVF)
Xiaodan Zhang, Xiaochuan Sun, Chuhao Liu, Kecheng Zhou, Huamiao Wang, Peidong Wu   +5 more
doaj   +1 more source

Experimental and Simulation Studies of Strength and Fracture Behaviors of Wind Turbine Bearing Steel Processed by High Pressure Torsion

Energies, 2016
White structure flaking (WSF) has been found to be one of the failure modes in bearing steels under rolling contacts through the formation of cracks associated with a microstructural change called white etching area (WEA).
Ning Wang, Luis V. Wilches Peña, Ling Wang, B. G. Mellor, Yi Huang   +4 more
doaj   +1 more source

Torsional Mechanics of Circular DNA

Circular DNA found in the cell is actively regulated to an underwound state, with their superhelical density close to σ ∼ - 0.06. While this underwound state is essential to life, how it impacts the torsional mechanical properties of DNA is not fully understood.
Gundeep Singh, Yifeng Hong, James T. Inman, James P. Sethna, Michelle D. Wang   +4 more
openaire   +2 more sources

Analysis of dynamic mechanical response in torsion [PDF]

Journal of Rheology, 2016
We investigate the dynamic response of industrial rubbers (styrene-butadiene random copolymers, SBR) in torsion and compare against common small amplitude oscillatory shear measurements by using a torsion rectangular fixture, a modified torsion cylindrical fixture, and a conventional parallel plate fixture, respectively, in two different rheometers ...
Dessi, Claudia, Tsibidis, George D., Vlassopoulos, Dimitris, DE CORATO, MARCO, TROFA, MARCO, D'AVINO, GAETANO, MAFFETTONE, PIER LUCA, Coppola, Salvatore   +7 more
openaire   +3 more sources

Torsion of a functionally graded bar [PDF]

, 2023
The purpose of the Final Year Project is to analyse the mechanical properties and characteristics of a functionally graded rod. Computational and analytical solutions are derived based for homogenous and bi-layered cylinders undergoing pure torsion ...
Chui, Nicholas Soon Weng
core  

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source