منابع مشابه
Polymer induced condensation of DNA supercoils.
Macromolecular crowding is thought to be a significant factor driving DNA condensation in prokaryotic cells. Whereas DNA in prokaryotes is supercoiled, studies on crowding-induced DNA condensation have so far focused on linear DNA. Here we compare DNA condensation by poly(ethylene oxide) for supercoiled and linearized pUC18 plasmid DNA. It is found that supercoiling has only a limited influence...
متن کاملIncreased water retention in polymer electrolyte membranes at elevated temperatures assisted by capillary condensation.
We establish a new systematic methodology for controlling the water retention of polymer electrolyte membranes. Block copolymer membranes comprising hydrophilic phases with widths ranging from 2 to 5 nm become wetter as the temperature of the surrounding air is increased at constant relative humidity. The widths of the moist hydrophilic phases were measured by cryogenic electron microscopy expe...
متن کاملSynthesis and Characterization of Three-dimensional Polymer Produced by Mutual Condensation of Ethylenediamine and C60
The polymer with contents of C60 up to 57 wt.% was produced by mutual condensation of fullerene C60 and ethylenediamine. The investigations of this polymer as well as pristine fullerene to comparison were carried out by FT-IR and UV-Vis spectroscopy, ToF-SIMS, TGA, and elemental analysis. At least three kinds of components was revealed as building blocks of polymer. The fullerene cage underwent...
متن کاملFlexible polymer-induced condensation and bundle formation of DNA and F-actin filaments.
A simple semi-empirical theory is developed for the ionic strength dependence of the flexible polymer-induced condensation of semiflexible polyelectrolytes such as DNA and F-actin filaments. Critical concentrations of flexible polymer needed for condensation are calculated by comparing the free energies of inserting the semiflexible polyelectrolytes in a solution of flexible polymers, respectiv...
متن کاملEncounter time of two loci governed by polymer de-condensation and local chromatin interaction
The time for a DNA sequence to find its homologous depends on a long random search process inside the cell nucleus. Using polymer models, we model and compute here the mean first encounter time (MFET) between two sites located on two different polymer chains and confined by potential wells. We find that reducing the potential (tethering) forces results in a local polymer decondensation near the...
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ژورنال
عنوان ژورنال: Kobunshi
سال: 1980
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.29.452