منابع مشابه
Shape-persistent macromolecular disks from reactive supramolecular rod bundles.
We have synthesized a coil-rod-coil molecule based on a reactive rod block that self-organizes into a 3-D hexagonal close-packed (hcp) bundle structure in the melt state. Photo-cross-linking within an aromatic bundle yielded macromolecular disklike objects (molecular weight of 330 kDa) with a narrow size distribution that was essentially the same as that of the supramolecular bundles. In additi...
متن کاملCokernel Bundles and Fibonacci Bundles
We are interested in those bundles on P that admits a resolution of the form 0 → C ⊗ E φ −→ C t ⊗ F → C → 0. In this paper we prove that, under suitable conditions on E, F , a generic bundle with this form is either simple, or canonically decomposable. As applications we provide an easy criterion for the stability of such bundles on P and we prove the stability of all Steiner exceptional bundle...
متن کاملInterphase microtubule bundles use global cell shape to guide spindle alignment in fission yeast.
Correct spindle alignment requires a cell to detect and interpret its global geometry and to communicate this information to the mitotic spindle. In the fission yeast, Schizosaccharomyces pombe, the mitotic spindle is aligned with the longitudinal axis of the rod-shaped cell. Here, using wild-type and cell-shape mutants we investigate the mechanism of initial spindle alignment and show that att...
متن کاملProbabilistic Clustering and Shape Modelling of White Matter Fibre Bundles Using Regression Mixtures
We present a novel approach for probabilistic clustering of white matter fibre pathways using curve-based regression mixture modelling techniques in 3D curve space. The clustering algorithm is based on a principled method for probabilistic modelling of a set of fibre trajectories as individual sequences of points generated from a finite mixture model consisting of multivariate polynomial regres...
متن کاملThe elasticity of motor-microtubule bundles and shape of the mitotic spindle.
In the process of cell division, chromosomes are segregated by mitotic spindles -- bipolar microtubule arrays that have a characteristic fusiform shape. Mitotic spindle function is based on motor-generated forces of hundreds of piconewtons. These forces have to deform the spindle, yet the role of microtubule elastic deformations in the spindle remains unclear. Here we solve equations of elastic...
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ژورنال
عنوان ژورنال: Topology and its Applications
سال: 1981
ISSN: 0166-8641
DOI: 10.1016/0166-8641(81)90033-x