TY - JOUR N2 - Experiments have been carried out on the influence exerted by Aroclor 1254 upon the photosynthetic production of organic 14C by an assemblage of marine Antarctic diatoms (Thalassiosira sp. 48%, Nitzschia sp. 21%, Chaetoceros sp. 15% and Corethron iriophilum 10%). Samples of various numbers of cells per cm3 of water have been used. Incorporation of 14C02 by the diatoms proved to be proportional to the increased number of cells in the sample only at the lowest levels of concentration in per cm3. Further increase of the level of 14C in diatoms has not been found as number of cells in the sample kept growing. Calculation of brutto photosynthesis has indicated that low concentration of Aroclor 1254 (0,01 to 1 ppm) may stimulate the photosynthetic incorporation of carbon, yet the photosynthetic release of carbon from cells within the photorespiratory process is stimulated to a higher degree. High concentration of Aroclor (1 to 50 ppm) inhibit the brutto assimilation, yet the release of carbon during the photorespiratory process is inhibited to a higher degree. A hypothesis is being considered implying that the relation between the intensity of photosynthesis and intensity of photorespiration may vary according to the rate of concentration of Aroclor. L1 - http://www.journals.pan.pl/Content/111213/PDF-MASTER/1989_2_125-131.pdf L2 - http://www.journals.pan.pl/Content/111213 PY - 1989 IS - No 2 EP - 131 KW - Aroclor 1254 KW - Antarctic marine diatoms KW - photosynthetic production of organic carbon A1 - Bystrzejewska, Grażyna A1 - Łukowski, Aleksy A1 - Ligowski, Ryszard PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 10 DA - 1989 T1 - Changes of photosynthetic production of organic carbon in Antarctic marine diatoms influenced by Aroclor1254 SP - 125 UR - http://www.journals.pan.pl/dlibra/publication/edition/111213 T2 - Polish Polar Research ER -