http://nopr.niscair.res.in/handle/123456789/7 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/49 Title: N-methylpyrrolidone: Isolation and characterization of the compound from the marine sponge Clathria frondifera (class:Demospongiae) <br/> <br/>Authors: Radhika, G.; Venkatesan, R.; Kathiroli, S. <br/> <br/>Abstract: An investigation of the chemical composition of the marine sponge Clathria frondifera resulted in the isolation of the compound N-methylpyrrolidone which is widely used in the petrochemical, microelectronics fabrication, paint and pharmaceutical industry. This is the first report on the isolation and structural characterization of N-methylpyrrolidone from a marine source. The compound was purified by column chromatography and analyzed by TLC. The functional groups were analyzed by FTIR spectrum. The structure of the compound was established by spectroscopic analysis (UV, 1H and 13C NMR) and elucidated with the aid of COSY, HMQC, and HMBC experiments. <br/> <br/>Page(s): 235-238 Wed, 29 Aug 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/48 Title: Iron (Fe) concentrations in the byssus and soft tissues of the green-lipped mussel Perna viridis (L.): Byssus as an excretion route of Fe and Fe bioavailability in the coastal waters <br/> <br/>Authors: Yap, C. K.; Tan, S. G. <br/> <br/>Abstract: Iron (Fe) in the marine mussels has been reported to play an important role in the strength of attachment of the mussels since Fe is a major element in the attachment property on the mussel byssus. However, the distribution of Fe in the green-lipped mussel Perna viridis has not been reported in the literature. In this study, the distribution of Fe in different parts of the byssus and soft tissues of Perna viridis were investigated. It was found that the attachment plaque of the byssus accumulated the highest concentration of Fe, followed by the proximal, distal, stem and root. Iron levels were determined in the byssus and soft tissues of P. viridis collected from 12 geographical sites. It was found that the Fe levels in the byssus were the highest among all the soft tissues studied. The Fe levels could be about 3-17 times higher (P <0.05) in the byssus than in the different soft tissues of P. viridis. Since the byssus of blue mussel Mytilus edulis has been reported to be an excretion route for Fe, it is believed that the byssus of P. viridis is an excretion route for Fe. The Fe could be an essential metal for byssal formation and the byssus is a potential biomonitoring organ for Fe bioavailaibility in coastal waters. <br/> <br/>Page(s): 227-234 Wed, 29 Aug 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/47 Title: Structure and secondary production of the macrobenthic community in an aquatic transition environment of the Gulf of Olbia, Mediterranean Sea <br/> <br/>Authors: Munari, Cristina; Mistri, Michele <br/> <br/>Abstract: The composition and the secondary production of the macrobenthic community of Rio Padrongiano Delta (the Gulf of Olbia, Tyrrhenian Sea) was investigated. Three sites (L, S and C) were sampled quarterly for macrofauna; environmental variables were measured monthly at each site. A total of 115 taxa, representing 9 phyla were identified. Data were subjected to univariate and multivariate analyses to discriminate among sites. Two-way ANOVA indicated that abundance N and other community measures (H’, Δ* and Δ⁺) differed greatly among sites. Two sites were numerically dominated by Polychaetes (54.6% and 58.3% of total abundance, respectively), while, at the third site, they represented only 24.1%. Molluscs made the greatest contribution to the community biomass at all sites, accounting for 96%, 89.4% and 80.7% of the total biomass, respectively. Benthic production was estimated by an indirect method. Mean annual secondary production of macrobenthic community varied among 8.5, 23.8 and 94 g/m²/yr. Differences among sites were mostly dependent on the different contribute of an invasive mussel, Musculista senhousia. Musculista senhousia seems to facilitate other macrobenthic taxa and seems to have a fundamental role on secondary production of the macrobenthic community. <br/> <br/>Page(s): 216-226 Wed, 29 Aug 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/44 Title: Composition and seasonal dynamics of postlarval and juvenile fishes in the Sundarbans mangrove waters, Bangladesh <br/> <br/>Authors: Hoq, M. Enamul; Nazrul Islam, M. <br/> <br/>Abstract: The composition and temporal distribution of the postlarval and juvenile fishes in five river systems of Sundarbans mangrove water with different salinities were studied. Monthly or fortnightly day time sampling was conducted with a rectangular drag net. Thirty seven species of fish belonging to 27 families were recorded during the 2 years study. Panchax melastigma, Liza parsia, L. tade and Gobiidae were the most abundant fish species/taxa. In the Sundarbans, species diversity and abundance gradually decreased from the freshwater zone to the saline zone. The highest monthly density of 13 species was observed in the Passur river during November. Liza spp. was the most abundant juvenile catch constituting 29.32%, followed by a small fish P. melastigma (20.13%) and Gobiidae (12.98%). No significant variation in abundance of fish species was observed with lunar cycle, although the annual peak was recorded in winter. Fish abundances varied significantly (p<0.05) among months and rivers. Water temperature and salinity were correlated with the most abundant species. <br/> <br/>Page(s): 206-215 Wed, 29 Aug 2007 22:58:59 GMT