Elastic at short time, viscous at long time ... Elastic stress reactive, viscous stress dissipative. â ij. ât.. ij.. =2Eu ... Onsager hydrodynamic theory of actin-myosin gels. Fluxes and ... Stability of movement even if the friction force is a non-.
=− /2 E≪1 2h = h sinh x / v= cosh L /2 2
Stability of movement even if the friction force is a nonmonotonous function of velocity Gel velocity vc = (vp +vd)/2 Critical polymerization velocity Density profile Contraction at the back
2 h v =v d − c p
Polymerization kinetics
Actin polymerization promoter Concentrated at the contact line wa x =0 exp −x / ', Forces local polarization orientation Polymerization velocity
v p=k p wa x
Lamellipodium thickness h=0 k p '/ v d
' =Dwa / v
Polarization defects Nematic point defects in two dimensions topological charge 1 singular solutions of the director equilibrium equations ∇ 2 =0
aster
=
vortex
spiral
Active orientational defects Rotating spiral nematodynamics short distances
1 cos 2 = 1 v =0 r log r / r 0 ,
stable if ν1>1 0 =
2 1 sin 2 4 1 2 1 sin2 2
Keratocyte motion Two coupled vortices advancing velocity 1μm/s adhesion not treated
Other active gel problems Propagating waves 1d travelling waves
= c q ,
c =
v 0
c c 0
1T c k off
c c 0
Cortical actin K.Storm Finite thickness if -ζΔμ large enough Unstable C.Sykes, E.Paluch Bacterial « Turbulence » R.Voituriez Compressible gel unstable towards lattice of rotating vortices
somatosensation. For example, it was Katz [7] who first discussed the concepts of passive and active touch and work on these aspects of touch continue.
philic recognition processes have been characterized. These include the ... (the Eph class of tyrosine kinase receptors), to name a few .... embryos, both proteins concentrate on external sensory organ precursors. Overall ..... extend in parallel fas
Jan 22, 2007 - can also function to activate signaling cascades independently of. G protein activation. .... a ubiquitin-activating enzyme, E1, activates.
Jan 22, 2007 - naling led to their discovery, later research ap- preciated ..... pool of phospho-ERK after 10 min (58). ... miminal until 10 min poststimulation but was ...... Bohn LM, Lefkowitz RJ, Gainetdinov RR, Peppel K, Caron MG, Lin FT.
configuration required for our design was solar and fuel cell powdered, ...... generation: alternative of first and second generation (High efficiency, light weight).
Mar 23, 2007 - plus probe tip ... Figure 1. InfiniiMax Probe. This application note explains how offset is applied in the ... dc component in the plus and ... Multiple form factors from 20 MHz to >90 GHz | Industry leading ... 0800 80 53 53 (Opt 1).
In contrast, reproduction of the shape of the path was affected: the errors of reproduction were .... city and of their style environment, can be used to draw inferences about ...... [28] K. Lynch, Image of the City, MIT Press, Cambridge, MA, 1960.
Page 1 ... to develop the concept of energy dissipation, or supplemental damping, into a ... With recent development and implementation of modern structural protective ...... of R/C Structures with Viscoelastic Braces, Earthquake Spectra, 9(3), 419-4
device as the classic problem of approximating analytic functions with poly- ...... [11] Evans LC, Gariepy RF (1992) Measure theory and fine properties of.
The model and serial numbers are located on the right side of the unit. Record the serial ..... con salida nominal superior a la del amplificador). t Baje el volumen.