Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The lubricity of mucin solutions is robust toward changes in
  physiological conditions   Solutions of manually purified gastric mucins have been shown to be promising
lubricants for biomedical purposes, where they can efficiently reduce friction
and wear. However, so far, such mucin solutions have been mostly tested in
specific settings, and variations in the composition of the lubricating fluid
have not been systematically explored. We here fill this gap and determine the
viscosity, adsorption behavior, and lubricity of porcine gastric mucin
solutions on hydrophobic surfaces at different pH levels, mucin and salt
concentrations and in the presence of other proteins. We demonstrate that mucin
solutions provide excellent lubricity even at very low concentrations of 0.01 %
(w/v), over a broad range of pH levels and even at elevated ionic strength.
Furthermore, we provide mechanistic insights into mucin lubricity, which help
explain how certain variations in physiologically relevant parameters can limit
the lubricating potential of mucin solutions. Our results motivate that
solutions of manually purified mucin solutions can be powerful biomedical
lubricants, e.g. serving as eye drops, mouth sprays or as a personal lubricant
for intercourse.

32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol