Buckling, stiffening, and negative dissipation in the dynamics of a biopolymer in an active medium Export

@article{Kikuchi2009, abstract = {10.1073/pnas.0900451106 We present a generic theory for the dynamics of a stiff filament under tension, in an active medium with orientational correlations, such as a microtubule in contractile actin. In sharp contrast to the case of a passive medium, we find the filament can stiffen, and possibly oscillate or buckle, depending on both the contractile or tensile nature of the activity and the filament-medium anchoring interaction. We also demonstrate a strong violation of the fluctuation\^{a}€“dissipation (FD) relation in the effective dynamics of the filament, including a negative FD ratio. Our approach is also of relevance to the dynamics of axons, and our model equations bear a remarkable formal similarity to those in recent work [Martin P, Hudspeth AJ, Juelicher F (2001) Proc Natl Acad Sci USA 98:14380\^{a}€“14385] on auditory hair cells. Detailed tests of our predictions can be made by using a single filament in actomyosin extracts or bacterial suspensions.}, author = {Kikuchi, Norio and Ehrlicher, Allen and Koch, Daniel and K\~{A}¤s, Josef A. and Ramaswamy, Sriram and Rao, Madan}, citeulike-article-id = {6092505}, citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.0900451106}, citeulike-linkout-1 = {http://www.pnas.org/content/0900451106v1/.abstract}, citeulike-linkout-2 = {http://www.pnas.org/content/0900451106v1/.full.pdf}, day = {9}, doi = {10.1073/pnas.0900451106}, journal = {Proceedings of the National Academy of Sciences}, keywords = {molecular-motors, polymer-networks, polymer-physics}, month = {November}, posted-at = {2009-11-10 09:44:57}, priority = {4}, title = {Buckling, stiffening, and negative dissipation in the dynamics of a biopolymer in an active medium}, url = {http://dx.doi.org/10.1073/pnas.0900451106}, year = {2009} }

TY - JOUR ID - Kikuchi2009 L3 - citeulike-article-id:6092505 N2 - 10.1073/pnas.0900451106 We present a generic theory for the dynamics of a stiff filament under tension, in an active medium with orientational correlations, such as a microtubule in contractile actin. In sharp contrast to the case of a passive medium, we find the filament can stiffen, and possibly oscillate or buckle, depending on both the contractile or tensile nature of the activity and the filament-medium anchoring interaction. We also demonstrate a strong violation of the fluctuation–dissipation (FD) relation in the effective dynamics of the filament, including a negative FD ratio. Our approach is also of relevance to the dynamics of axons, and our model equations bear a remarkable formal similarity to those in recent work [Martin P, Hudspeth AJ, Juelicher F (2001) Proc Natl Acad Sci USA 98:14380–14385] on auditory hair cells. Detailed tests of our predictions can be made by using a single filament in actomyosin extracts or bacterial suspensions. JF - Proceedings of the National Academy of Sciences TI - Buckling, stiffening, and negative dissipation in the dynamics of a biopolymer in an active medium KW - molecular-motors KW - polymer-networks KW - polymer-physics AU - Kikuchi, Norio AU - Ehrlicher, Allen AU - Koch, Daniel AU - Käs, Josef AU - Ramaswamy, Sriram AU - Rao, Madan PY - 2009/11/09/ UR - http://dx.doi.org/10.1073/pnas.0900451106 ER -