Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Milczarek I. , Jaskowska A. , Gołębiowska D. 2003. INFLUENCE OF HUMIC ACIDS (HA), DCMU, AND LIGHT ON THE ULTRAWEAK LUMINESCENCE (UL) OF CHARACEAE CELLS, EJPAU 6(2), #02.
Available Online: http://www.ejpau.media.pl/volume6/issue2/environment/abs-02.html

ABSTRACT

Ultraweak luminescence (UL) within the visible range accompanies physiological processes taking place in Native non-stressed Nitellopsis Obtusa cells. Intensity of UL emission is several times higher than the intensity of an environmental medium. The influence of Humic acid (HA), diuron-urea herbicide (DCMU) and photosynthetic active radiation (PAR) on UL intensity and spectral composition for algae cells was investigated. Measurements were made both in neutral and reactive media. An artificial pond water (APW) served as a neutral medium. Algae cells in APW were used as the control samples. Concentrations of specific chemical agents were equal to 8·10^-2mg·mL^-1, 4.2·10^-2 mmol·L^-1 for HA and DCMU, respectively, whereas PAR intensity reached 900 µE·s^-1·m^-2. The influence of HA and light on UL intensity was studied. It was found that by light alone doubles UL intensity, whereas it remains un

Key words: ultraweak luminescence, algae (Characeae), humic acids, DCMU, light..

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