Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of Preservation Temperature on the Measured Mechanical
  Properties of Brain Tissue   The large variability in experimentally measured mechanical properties of
brain tissue is due to many factors including heterogeneity, anisotropy, age
dependence and post-mortem time. Moreover, differences in test protocols also
influence these measured properties. This paper shows that the temperature at
which porcine brain tissue is stored or preserved prior to testing has a
significant effect on the mechanical properties of brain tissue, even when
tests are conducted at the same temperatures. Three groups of brain tissue were
stored separately for at least one hour at three different preservation
temperatures, i.e., ice cold, room temperature (22C) and body temperature
(37C), prior to them all being tested at room temperature (approx. 22C).
Significant differences in the corresponding initial elastic shear modulus mu
(Pa) (at various amounts of shear, K, i.e., 0-0.2) were observed. The initial
elastic moduli were 1043 +/- 271 Pa, 714 +/- 210 Pa and 497 +/- 156 Pa (mean
+/- SD) at preservation temperatures of ice cold, 22C and 37C, respectively.
Based on this investigation, it is strongly recommended that brain tissue
samples must be preserved at an ice-cold temperature prior to testing in order
to minimize the difference between the measured in vitro test results and the
in vivo properties. A by-product of the study is that simple shear tests allow
for large, almost perfectly homogeneous deformation of brain matter.

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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex