Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Achieving Analytical and Cellular Control in Confined Spaces and
  Continuous Flow   Sabeth Verpoorte is professor at the University of Groningen. In this
contribution she describes the development of a microfluidic incubation system
for drug metabolism studies using a "top-down" precision-cut tissue slice
model. She also outlines a fundamental particle separation concept, which
relies on the generation of controlled bi-directional flow in microchannels
having variable cross-sectional dimensions, by opposing pressure-driven and
electrokinetic flows.

25
The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph