Results 11 to 20 of about 19,020 (254)
Physical Review Letters, 1997 Summary: We investigate quantum Brownian motion in adiabatically rocked ratchet systems. Above a crossover temperature \(T_c\) tunneling events are rare, yet they already substantially enhance the classical particle current. Below \(T_c\), quantum tunneling prevails and the classical predictions grossly underestimate the transport. Upon approaching \(T=
Reimann, Peter +2 more
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Proceedings of the Royal Society B: Biological Sciences, 2009 Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to
KULIC, IM +4 more
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Cancer Cell, 2008 In this issue of Cancer Cell, Murphy et al. describe a mouse model designed to examine the biological effects of different levels of deregulated c-myc expression. They provide evidence that distinct threshold levels of Myc are required for increased proliferation and for apoptosis in different tissues.
Freie, Brian W., Eisenman, Robert N.
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Mechanochemical active ratchet
Scientific Reports, 2023 AbstractSelf-propelled nanoparticles moving through liquids offer the possibility of creating advanced applications where such nanoswimmers can operate as artificial molecular-sized motors. Achieving control over the motion of nanoswimmers is a crucial aspect for their reliable functioning.
Artem Ryabov, Mykola Tasinkevych
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Nature Reviews Chemistry, 2023 Synthetic chemistry has traditionally relied on reactions between reactants of high chemical potential and transformations that proceed energetically downhill to either a global or local minimum (thermodynamic or kinetic control). Catalysts can be used to manipulate kinetic control, lowering activation energies to influence reaction outcomes.
Stefan Borsley +3 more
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EPL (Europhysics Letters), 2009 We present a generic formalism to describe Brownian motion of particles with intrinsic asymmetry and give predictions for the drift behavior in unbiased time-dependent force fields. Our findings are supported by molecular dynamics simulations.
Broek, M. van den +2 more
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Confined Brownian ratchets [PDF]
The Journal of Chemical Physics, 2013 We analyze the dynamics of Brownian ratchets in a confined environment. The motion of the particles is described by a Fick-Jakobs kinetic equation in which the presence of boundaries is modeled by means of an entropic potential. The cases of a flashing ratchet, a two-state model, and a ratchet under the influence of a temperature gradient are analyzed ...
Malgaretti, Paolo +2 more
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Ratcheting droplet pairs [PDF]
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2018 Millimetric droplets may be levitated on the surface of a vibrating fluid bath. Eddi et al. [Europhys. Lett. 82, 44001 (2008)] demonstrated that when a pair of levitating drops of unequal size are placed nearby, they interact through their common wavefield in such a way as to self-propel through a ratcheting mechanism.
C. A. Galeano-Rios +3 more
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