33,088 research outputs found
A Simple Computer Model for Liquid Lipid Bilayers
We present a simple coarse-grained bead-and-spring model for lipid bilayers.
The system has been developed to reproduce the main (gel-liquid) transition of
biological membranes on intermediate length scales of a couple of nanometres
and is very efficient from a computational point of view. For the solvent
environment, two different models are proposed. The first model forces the
lipids to form bilayers by confining their heads in two parallel planes. In the
second model, the bilayer is stabilised by a surrounding gas of "phantom"
solvent beads, which do not interact with each other. This model takes only
slightly more computing time than the first one, while retaining the full
membrane flexibility. We calculate the liquid-gel phase boundaries for both
models and find that they are very similar.Comment: 11 pages, 6 figure
Connections and the Second Main Theorem for Holomorphic Curves
By means of -connections we will prove a general second main
theorem and some special ones for holomorphic curves. The method gives a
geometric proof of H. Cartan's second main theorem in 1933. By applying the
same method, we will prove some second main theorems in the case of the product
space (\pone)^2 of the Riemann sphere.Comment: 21 page
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