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Tissue P Systems with Protein on Cells

Song B., Pan L., Pérez-Jiménez M. J.

Fundamenta Informaticae

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2016

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Vol. 144, nr 1

77--107

EN

Tissue P systems are a class of distributed parallel computing devices inspired by biochemical interactions between cells in a tissue-like arrangement, where objects can be exchanged by means of communication channels. In this work, inspired by the biological facts that the movement of most objects through communication channels is controlled by proteins and proteins can move through lipid bilayers between cells (if these cells are fused), we present a new class of variant tissue P systems, called tissue P systems with protein on cells, where multisets of objects (maybe empty), together with proteins between cells are exchanged. The computational power of such P systems is studied. Specifically, an efficient (uniform) solution to the SAT problem by using such P systems with cell division is presented. We also prove that any Turing computable set of numbers can be generated by a tissue P system with protein on cells. Both of these two results are obtained by such P systems with communication rules of length at most 4 (the length of a communication rule is the total number of objects and proteins involved in that rule).

2

A Tissue P Systems Based Uniform Solution to Tripartite Matching Problem

Niu Y., Pan L., Pérez-Jiménez M.J., Font M. R.

Fundamenta Informaticae

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2011

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Vol. 109, nr 2

179-188

EN

A tissue P system with cell division is a computing model which has two basic features: intercellular communication and the ability of cell division. The ability of cell division allows us to obtain an exponential amount of cells in linear time and to design cellular solutions to computationally hard problems in polynomial time. In this work we present an efficient solution to the tripartite matching problem by a family of such devices. This solution leads to an interesting open problem whether tissue P systems with cell division and communication rules of length 2 can solve NPcomplete problems. An answer to this open problem will provide a borderline between efficiency and non-efficiency in terms of the lengths of communication rules.

3

Ocena wpływu promieniowania laserowego na materiały roślinne

Drozd D., Szajsner H.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

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2001

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Vol. 7, nr 3-4

165-171

PL

Przedmiotem badań było określenie wpływu promieniowania laserowego na wczesne fazy rozwoju pszenicy jarej w warunkach laboratoryjnych. Materiał stanowiło 10 odmian, nasiona kontrolne i traktowane różnymi dawkami światła lasera He-Ne i półprzewodnikowego. Oceniano energię i zdolność kiełkowania oraz mierzono długość korzeni, koleoptyla i nadziemnej części siewki. Oznaczano także indeks mitotyczny i zmiany w poszczególnych fazach mitozy. Do studiów nad zawartością wolnych rodników zastosowano elektronowy rezonans paramagnetyczny (EPR). Uzyskane wyniki opracowano statystycznie. Stwierdzono, że światło lasera istotnie podwyższyło wartość siewną oraz wpłynęło stymuluj ąco na cechy siewek. Obserwowano podwyższenie indeksu mitotycznego i zmiany, szczególnie w anafazie, a ilość wolny dv rodników uległa istotnemu podwyższeniu po zastosowaniu biostymulacji laserowej.

EN

The objective of the study was to determine laser radiation on spring wheat early phases growing in laboratory conditions. 10 cultivars were analysed, control seeds and seeds treated with different doses of He-Ne and semiconductor laser. Germinative energy and capacity were evaluated and coleoptile, first leaf and roots were measured. Mitotic index and changes in mitotic phases were examined. Electron paramagnetic resonance (EPR) spectroscopy was applied to the studies on free radicals. The results were analysed statistically. It was found that the laser radiation increased sowing value and stimulates seedlings characters. Increased mititic index and changes, especially in anaphase were observed. Laser biostimulation increases significant free radicals in spring wheat grains.