Knots appear in a wide variety of biophysical systems, ranging from biopolymers, such as
DNA and proteins, to macroscopic objects, such as umbilical cords and catheters. Although …

An improved version of the immersed boundary (IB) method is developed for simulating
flexible filaments in a uniform flow. The proposed IB method is based on an efficient Navier …

Tangled active filaments are ubiquitous in nature, from chromosomal DNA and cilia carpets
to root networks and worm collectives. How activity and elasticity facilitate collective …

We experimentally study the effects of a uniform electric field on the conformation of single
DNA molecules. We demonstrate that a moderate electric field (∼ 200 V/cm) strongly …

It is well known that a jostled string tends to become knotted; yet the factors governing the
“spontaneous” formation of various knots are unclear. We performed experiments in which a …

We present here a nonbiased probabilistic method that allows us to consistently analyze
knottedness of linear random walks with up to several hundred noncorrelated steps. The …

We numerically investigated the interactions of a laminar boundary layer flow with both
single and dual wall-mounted 2D flexible filaments. The influences of various parameters …

Knotting is a prevalent phenomenon which occurs at the macroscale (eg, in headphone
cords) and at the microscale (eg, in DNA and proteins). For a confined polymer, the knotting …

Recent theoretical progress has explained the physics of knotting of semiflexible polymers,
yet knotting of flexible polymers is relatively unexplored. We herein develop a new theory for …

The model of an elastic magnetic rod is applied for a study of a behavior of the flexible
magnetic particle chain in a rotating magnetic field. By numerical simulation it is shown that …