http://nopr.niscair.res.in/handle/123456789/1642 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/1694 Title: Antibacterial activity of the winged oyster Pteria chinensis (Pterioida: Pteridae) <br/> <br/>Authors: Chellaram, C.; Gnanambal, K. Mary Elizabeth; Edward, J.K. Patterson <br/> <br/>Abstract: The whole body extracts of the winged oyster, Pteria chinensis obtained with different solvents were assayed for antibacterial activity using agar well diffusion technique against human and fish pathogens. The acetone and chloroform crude extracts exhibited broad antibacterial activity. Highest activity was exhibited against Klebsiella pneumoniae (5 mm) and Staphylococcus epidermidis (5 mm) by the crude extract of acetone and against Salmonella paratyphi B (5 mm) by the chloroform extract. Similarly, the crude extract of chloroform was found to inhibit 8 out of 10 fish pathogens tested. The column-purified acetone fractions showed higher activity against Klebsiella pneumoniae (5 mm), Sreptococcus pneumoniae (4 mm), Serratia marcescens (4 mm) and Proteus mirabilis (4 mm). The MIC of the 100% acetone fraction was found to be lower for the pathogens, S. marcescens (100 μg) and P. mirabilis (150 μg) and hence 100% acetonated fraction of the extract of P. chinensis can be considered as potent antimicrobial compound against these pathogens. <br/> <br/>Page(s): 369-372 http://nopr.niscair.res.in/handle/123456789/1692 Title: Abundance and distribution of cyanobacteria Synechococcus spp in the south-eastern Black Sea during 2001 summer <br/> <br/>Authors: Feyzioglu, A. Muzaffer; Kurt, Ilknur; Boran, Muhammet; Sivri, Nuket <br/> <br/>Abstract: Abundance and distribution of unicellular cyanobacteria Synechococcus spp were studied during July 2001. Samples were collected from four different depths covering above the thermocline. Nitrate concentrations ranged from 0,005 μg at-l⁻¹ off Trabzon and Hopa to 1.284 μg at-l⁻¹ off Giresun. The highest concentration of Synechococcus spp. was at off Giresun at 25 m (6000 cell ml⁻¹) and off Rize (3700 cell ml⁻¹) at suface. Cyanobacteria cell counts were low at 5 and 10 m depths. The picoplanktonic abundance varies with nutrients in the Black Sea and it is quite lower in July 2001 somewhat similar to those observed in the oligotrophic Atlantic waters. <br/> <br/>Page(s): 365-368 http://nopr.niscair.res.in/handle/123456789/1691 Title: Immune enhancement assessment of dietry incorporated marine alga Sargassum wightii (Phaeophyceae/Punctariales) in tiger shrimp Penaeus monodon (Crustacia/Penaeidae) through prophenoloxidase (proPO) systems <br/> <br/>Authors: Felix, S.; Robins, P. Herald; Rajeev, A. <br/> <br/>Abstract: An experiment of 30 days duration was conducted to test the efficacy of the seaweed Sargassum wightii, as immunostimulant in tiger shrimp Penaeus monodon. The shrimps were fed with the experimental diets coated with different concentrations of the brown algae S. wightii viz. 10, 20 and 30 g/kg. They were challenged with a marine pathogen Vibrio parahaemolyticus to assess the increase in survival rate if any due to immune enhancement. Another group of shrimp was used for drawing the haemolymph to estimate the increase in the level of prophenoloxidase activity. Samplings for the above said analysis were carried out at regular intervals of 3 days viz. 1st, 3rd, 6th, 9th and 12th days. The highest prophenoloxidase activity (0.62) and the highest survival rate (83%) were recorded on the 12th day with the experimental diet (10 g/kg) . Hence the 10 g/kg of S. wightii added to the diet could be an eco-friendly and economically viable immunostimulant for penaeid shrimps. <br/> <br/>Page(s): 361-364 http://nopr.niscair.res.in/handle/123456789/1690 Title: Growth inhibition of human pro-myelocytic leukemia (HL-60) cells by lipid extracts of marine alga Sargassum marginatum (Fucales, Phaeophyta) harvested off Goa (west coast of India) with special reference to fatty acid composition <br/> <br/>Authors: Bhaskar, N <br/> <br/>Abstract: The present investigation deals with the fatty acid composition of total lipids and different lipid classes of brown seaweed Sargassum marginatum harvested off Goa. An effort was made to screen the growth inhibitiory/cytotoxic activity of lipid extracts on the human pro-melocytic leukemia (HL-60) cells. Phospholipids (PL) were found to be the most effective compared to the other lipid classes in terms of cytotoxic activity. PL exhibited cytotoxic activity at concentrations as low as 20 μg/ml. Phospholipids were found to be higher in poly unsaturated fatty acids (PUFA) among all the lipid classes analysed. This study indicates the possibility of seaweeds as potential sources of anticancer substances. Further works are needed to identify the active compound responsible for this anti-cancerous activity. The role of non-methylene interrupted (NMI) fatty acid specific to Sargassum spp, as anti-cancerous substance, also needs to be elucidated. <br/> <br/>Page(s): 355-360