@article{Ayash_Mohammad_Nassour_2018, title={The Effect of Ultraviolet Radiation on Photosynthetic pigments in Euglena gracilis}, volume={40}, url={https://journal.tishreen.edu.sy/index.php/bassnc/article/view/4351}, abstractNote={<p class="IEEEAbtract">The study was conducted during 2017 in the laboratories of the department of Botany at Tishreen University, Lattakia, Syria. The effect of ultraviolet radiation (UV-C and UV-B) for different periods (0.5, 1, 3, 5, 15, 15, 30, 45, 60 minutes) on the photosynthetic pigments of <em>Euglena gracilis</em> (with three stages of measurements) was studied. The results showed that chlorophyll pigments were more sensitive to UV-C compared to UV-B. These reductions were correlated with the increase in the exposure time, reaching the lowest value after 60 minutes exposure (97.83, 98.73, 99.18% for chlorophyll a, chlorophyll b and carotenoids when measured after 24 hours respectively).</p> <p>The polyethylene films protect the chlorophyll pigments against UV radiation. The protection rate was more evident against UV-C reaching 7.78% after 24 hours in the algae exposed for 30 minutes according to the experimental conditions.</p> <p> </p>}, number={2}, journal={Tishreen University Journal -Basic Sciences Series}, author={Ayash, Abdulkarim and Mohammad , Issam and Nassour, Rana}, year={2018}, month={Oct.} }