Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distribution of volume, microvoid percolation, and packing density in
  globular proteins   A fast and accurate grid-based method with low memory requirement is
presented to calculate volume characteristics in molecular systems. The
distribution of volume and packing density is characterized in globular
proteins, where void space is decomposed into microvoid volume and cavities
based on a spherical test probe with variable radius. A scan over test probe
radius is mapped onto a site percolation problem for microvoid volume.
Finite-size scaling is applied to determine critical exponents, which are found
to be consistent with connectivity percolation exponents in three dimensions.
Disparate results in the literature regarding packing density in the core of a
protein compared to on its surface, and with respect to protein size, is
elucidated in terms of microvoid volume within a unified implicit-solvent
model. By parameterizing the model to match the results of explicit-solvent
models that agree with experimental data, we verify that packing density within
globular proteins is spatially uniform and independent of protein size.

32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int