Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanosecond motions in proteins impose bounds on the timescale
  distributions of local dynamics   We elucidate the physics of the dynamical transition via 10-100ns molecular
dynamics simulations at temperatures spanning 160-300K. By tracking the energy
fluctuations, we show that the protein dynamical transition is marked by a
cross-over from piecewise stationary to stationary processes that underlie the
dynamics of protein motions. A two-time-scale function captures the
non-exponential character of backbone structural relaxations. One is attributed
to the collective segmental motions and the other to local relaxations. The
former is well-defined by a single-exponential, nanosecond decay, operative at
all temperatures. The latter is described by a set of processes that display a
distribution of time-scales. Though their average remains on the picosecond
time-scale, the distribution is markedly contracted at the onset of the
transition. The collective motions are shown to impose bounds on time-scales
spanned by local dynamical processes. The piecewise stationary character below
the transition implicates the presence of a collection of sub-states whose
interactions are restricted. At these temperatures, a wide distribution of
local motion time-scales, extending beyond that of nanoseconds is observed. At
physiological temperatures, local motions are confined to time-scales faster
than nanoseconds. This relatively narrow window makes possible the appearance
of multiple channels for the backbone dynamics to operate.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph