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 UVB)
for different periods (0.5, 1, 3, 5, 15, 15, 30, 45, 60 minutes) on the
photosynthetic
pigments of Euglena gracilis (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).
The polyethylene films protect the chlorophyll pigments against UV radiation.
The protection rate was more evident against UV-C reaching .7.7% after 24 hours in the
algae exposed for 30 minutes according to the experimental conditions.
general study of counted Bacteria and Chlorophyll a Give us an initial picture to the environment safety and vitality of marine environmental, which constitutes one of the basic components. In this paper, we show the most important results related to
horizontal and vertical changes of temperature and counted Bacteria, the concentrations of dyes Chlorophyll a,phaeophytine and relationships between them to depth of 300 m. The study showed a high degree in deep-water temperature reached to about two degrees in recent decades. as well as significant decrease in counted Bacteria (800 - 12750CFU / 100 ml) and dyes Chlorophyll a (under detection threshold - 0.24 mg / l) and phaeophytine (under the detection threshold - 0.064 mg / l), which refers to the weakness in the wild tributaries and low nutrients that reaches to the beaches and marine wealth , which reflect the negative impacts on marine environment.
