Effects of copper on photosynthetic activity and chlorophyll-a content of chaectoceros radicans Schutte

Chaetoceros radicans was selected to test the effect of copper concentrations of 0.001, 0.005, 0.01, 0.05, 0.1 and 0.5 ppm for 6 days on the photosynthetic activity and chlorophyll-a content under laboratory conditions. The photosynthetic activity decreased with time of exposure and copper concentration. The control photosynthetic activity reached a maximum value at 120 hours and chlorophyll-a at 72 hours. Chaetoceros radicans cultures treated by copper showed a slight decrease in its photosynthetic activity and chlorophyll-a at levels 0.001 and 0.005 ppm, while they rapidly decreased at higher copper concentrations

Residue levels of organochlorine insecticides and polychlorinated biphenyl [PCB's] in some organisms from the mediterranean sea off Alexandria, Egypt

Four species of fish, three species of crustacean and one species of green algae were collected from the Mediterranean sea off Alexandria, and analysed for their DDT'S, PCB's and lindane content the results indicate that the higher concentration of PCB 's was found in Sardina spp. And the lower was found in penaeus japonicus. While the high level of lindane content was found in portunus pelagica. The concentration factor [cf] of EPCB' s EDDT' s and EHCH is high in sardine spp. Content. The ratios between DDE/PCB are significantly different for fish [0.22 +/- 0.12], while in crustaceans the ratio was 0.29 +/- 0.15 and 0.023 for algae. The results obtained for accumulation of pesticides within the food chain in marine organisms collected from the Egyptian waters are in good agreement with those obtained from other regions of the Mediterranean Sea

Chemical composition of some marine algae from the mediterranean sea off Alexandria, Egypt

Caulerpa racemosa, Enteromorpha intestinalis, Ulva Fasciata, U.lactuca, Halopteris scoparia, corallina mediterranea, hypnea musciformis and pterocladia capillacea are collected from two regions with different degree of pollution, Abu Qir and Eastern Harbour. Ash, inorganic and organic species of marine algae 1- Ashcontentreaching to 53.0 mg g[-1] for Ulva fasciata and 350.0 mg g[-1] for coralline mediterranea. 2- Inorganic carbon ranged between 110.0 and 451.0 mg.g[-1] for Enteromorpha intestinalis and coralline meditrranea respesctively. 3- Organic carbon content is degraded from 604.3 to 131.0 mg g[-1] for Caulerpa eacemosa and Corallina mediterranea. 4- Total carbohydrates vary from 36.0 and 92.0 mg g[-1] for Hypna musciformis and pterocladia capillacea, respectively. 5- Protein contents are more fluctuated from 68.0 to 343.0 mg g[-1] for coralline mediterranea and ulva fasciata, respectively. 6- the algal protein is characterized by high level of glutamic and aspartic acids, valine, leucine, arginine, lysine and phenylalanine