Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cooperative long range protein-protein dynamics in Purple Membrane   We present experimental evidence for a long-range protein-protein interaction
in purple membrane (PM). The interprotein dynamics were quantified by measuring
the spectrum of the acoustic phonons in the 2D bacteriorhodopsin (BR) protein
lattice using inelastic neutron scattering. Phonon energies of about 1 meV were
determined. The data are compared to an analytical model, and the effective
spring constant for the interaction between neighboring protein trimers are
determined to be k=53 N/m. Additional, optical-like excitations at 0.45 meV
were found and assigned to intraprotein dynamics between neighboring BR
monomers.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph