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Proceedings Paper

Long-scale evolution of luminescent properties of water and glycyltryptophan solutions: influence of UV irradiation
Author(s): Valentin I. Lobyshev
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Paper Abstract

Distilled water possesses weak luminescence in the near UV and visible regions of the spectrum. Trace amounts of both luminescent and non-luminescent substances stimulate the emission of luminescence at both wavelengths 360 and 410 nm. The intensity of the 'short-wave' band in pure water is approximately ten times less, than the corresponding intensity in aqueous solution of glycyltryptophan with concentration about 0.006 mg/ml while the intensity of the'long-wave' band in pure water is only twice less than in the solution. Optical properties of stored samples of water and glycyltryptophan solutions change spontaneously during several days after preparation. These changes may be of monotonous and nonmonotonous (even oscillatory) character. Finally the system comes to a stable state which can either coincide with the initial state or differs from it. Changes in luminescent features under the influence of weak UV and X-ray radiation are also observed. The effect of external fields depends greatly on the phase state of solution, according to the spontaneous dynamics of solution, being the highest at non- equilibrium state. The duration and complexity of evolution of the luminescence spectra confirm the idea that water and aqueous solutions should be considered as non-equilibrium systems capable to self-organization.

Paper Details

Date Published: 17 May 1999
PDF: 6 pages
Proc. SPIE 3599, Optical Diagnostics of Biological Fluids IV, (17 May 1999); doi: 10.1117/12.348362
Show Author Affiliations
Valentin I. Lobyshev, M.V. Lomonosov Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 3599:
Optical Diagnostics of Biological Fluids IV
Alexander V. Priezzhev; Toshimitsu Asakura, Editor(s)

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