Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lifetime positron annihilation spectroscopy and photo-inactivated
  bacteria   Combined positron and visible light irradiations in the photodynamical
therapy (PDT) applications are analyzed. Objectives and goals of PDT are
killing or irreversible oxidative damage of pathogenic cells, or rather their
cell walls, cell membranes, peptides, and nucleic acids by photo-activated
oxygen of photosentizer injected into the target cell during light irradiation.
In this paper, the arguments for involving of lifetime positron annihilation
spectroscopy to control of photodamaging cells in the course of the PDT
procedure are given on the examples of gram-positive and gram-negative bacteria
basing on a brief survey of the literature.

32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math