نتایج جستجو برای: pore system

تعداد نتایج: 2266274  

Journal: :The Journal of Cell Biology 2000
Michael P. Rout John D. Aitchison Adisetyantari Suprapto Kelly Hjertaas Yingming Zhao Brian T. Chait

An understanding of how the nuclear pore complex (NPC) mediates nucleocytoplasmic exchange requires a comprehensive inventory of the molecular components of the NPC and a knowledge of how each component contributes to the overall structure of this large molecular translocation machine. Therefore, we have taken a comprehensive approach to classify all components of the yeast NPC (nucleoporins). ...

Journal: :The Journal of chemical physics 2015
Elshad Allahyarov Philip L Taylor Hartmut Löwen

Coarse-grained simulations in the united-atom-model approximation are used to investigate confinement-induced morphological changes in Nafion-like ionomers. The system we study models a cylindrical pore in a hydrophobic matrix of supporting material with pore diameters that vary from 0.7 to 3.96 nm. Simulation results indicate a strong dependence of the equilibrium ionomer structures both on th...

Journal: :Physical chemistry chemical physics : PCCP 2015
Qingrong Xiong Claudia Joseph Katja Schmeide Andrey P Jivkov

Compacted clays are considered as excellent candidates for barriers to radionuclide transport in future repositories for nuclear waste due to their very low hydraulic permeability. Diffusion is the dominant transport mechanism, controlled by a nano-scale pore system. Assessment of the clays' long-term containment function requires adequate modelling of such pore systems and their evolution. Exi...

Journal: :Journal of molecular biology 2003
Daniel Stoffler Bernhard Feja Birthe Fahrenkrog Jochen Walz Dieter Typke Ueli Aebi

To go beyond the current structural consensus model of the nuclear pore complex (NPC), we performed cryo-electron tomography of fully native NPCs from Xenopus oocyte nuclear envelopes (NEs). The cytoplasmic face of the NPC revealed distinct anchoring sites for the cytoplasmic filaments, whereas the nuclear face was topped with a massive distal ring positioned above the central pore with indicat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مدیریت و حسابداری 1391

the application of e-learning systems - as one of the solutions to the issue of anywhere and anytime learning – is increasingly spreading in the area of education. content management - one of the most important parts of any e-learning system- is in the concern of tutors and teachers through which they can obtain means and paths to achieve the goals of the course and learning objectives. e-learn...

Journal: :Science 2013
Anna Szymborska Alex de Marco Nathalie Daigle Volker C Cordes John A G Briggs Jan Ellenberg

Much of life's essential molecular machinery consists of large protein assemblies that currently pose challenges for structure determination. A prominent example is the nuclear pore complex (NPC), for which the organization of its individual components remains unknown. By combining stochastic super-resolution microscopy, to directly resolve the ringlike structure of the NPC, with single particl...

Journal: :The Journal of Cell Biology 1995
E Meier B R Miller D J Forbes

Formation of the nuclear pore is an intricate process involving membrane fusion and the ordered assembly of up to 1,000 pore proteins. As such, the study of pore assembly is not a simple one. Interestingly, annulate lamellae, a cytoplasmic organelle consisting of stacks of flattened membrane cisternae perforated by numerous pore complexes, have been found to form spontaneously in a reconstituti...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2010
M-T Wolfram M Burger Z S Siwy

High surface charges of polymer pore walls and applied electric fields can lead to the formation and subsequent dissolution of precipitates in nanopores. These precipitates block the pore, leading to current fluctuations. We present an extended Poisson-Nernst-Planck system which includes chemical reactions of precipitation and dissolution. We discuss the mathematical modeling and present 2D num...

2005
S. Békri

The objective of the present work is to demonstrate the effect of pore structure on fluid transport and electrical properties of homogeneous or dual-porosity pore structures for drainage conditions. To this end, a pore network numerical simulator is used that calculates multiphase flow and electrical properties taking into account the pore structure specificities. The characteristics of the 3-D...

Journal: :The Journal of Cell Biology 1972
Gerd G. Maul Helmut M. Maul Joseph E. Scogna Michael W. Lieberman Gary S. Stein Betty Yee-Li Hsu Thaddeus W. Borun

The time sequence of nuclear pore frequency changes was determined for phytohemagglutinin (PHA)-stimulated human lymphocytes and for HeLa S-3 cells during the cell cycle. The number of nuclear pores/nucleus was calculated from the experimentally determined values of nuclear pores/micro(2) and the nuclear surface. In the lymphocyte system the number of pores/nucleus approximately doubles during ...

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