Showing 3 results for Pigment
Latifeh Pourakbar, ,
Volume 13, Issue 1 (5-2013)
Abstract
Copper and nickel are an essential micronutrient for plants, playing an important role in maintaining plants' natural metabolism and growth, but in excess both heavy metal are also a proven inhibitor of various physiological functions. In this study maize (Zea mays L.) plants grown in hydroponic culture were treated with CuSO4 (0, and 100 &mum),NiSO4 (0,100 and 200&mum)and interaction of CuSO4 (100 &mum)and NiSO4 (100 and 200 &mum). After 1 mounth of treatment, growth parameters and some biochemical changes were studied in roots and shoots of plants. The results showed that with increasing Cu and Ni concentration, pigment contents (chlorophyll a, b and total carotenoids), root and shoot length and dry weight were decreased, while k+ leakage, malondealdyde as indicator lipid of peroxidation and some antioxidant enzyme activity were increased. Also result showed that interaction of Cu and Ni has been cooperation effects on together and intensify each other's work
Asghar Hejazipour, M Zamani, S Zargari, E Feizian,
Volume 14, Issue 2 (7-2014)
Abstract
In this research an organic dye called Porphyrin, which showed TCPP in abbreviation form, synthesis. In order to characterized this dye UV-Vis absorptive spectrum was derived and compared with other articles samples. This dye was used to build a dye sensitized solar cell(DSSC), and after characterization of this cell the function of it was measured. Porphyrin absorption spectra obtained in this study is consistent with similar in iranian and international samples that Confirm the accuracy of the porphyrin and a high absorbtion intensity is achieved. A DSSC based TCPP have a good performance that open circuit voltage 0.49 v and short circiut current density 3.6 mA/cm2 and efficiency 0.7% has achieved.
Volume 18, Issue 56 (9-2006)
Abstract
Due to the importance of benthic cyanobacteria in nitrogen fixation in paddyfields, the physiological responses of Fischerella ambigua FS 18 to salinity (NaCl 0, 0.5 & 1%) were investigated. Results indicated that growth rate was higher in control and that NaCl did not inhibit growth of other treatments. Similar responses were seen in the case of other physiological processes. Chlorophyll was declined with increasing salinity. Phycobiliproteins (PBP), phycocyanin (PC) and allophycocyanin (APC) were at least in 0.5% but the differences were not significant. The light-saturated photosynthetic rate was higher in control and decreased with increasing in salinity. With respect to nitrogenase activity, the highest rate was in control and the cultures with higher growth rates reached to the maximum level at a shorter time. There was no significant difference between 0.5 and 1% in relation to nitrogenase activity.
