Spatio-temporal variation of microphytoplankton in the upwelling system of the south-eastern Arabian Sea during the summer monsoon of 2009**This investigation was conducted under the Marine Living Resources Programme funded by the Ministry of Earth Sciences, Government of India, New Delhi.

AbstractThe phytoplankton standing crop was assessed in detail along the South Eastern Arabian Sea (SEAS) during the different phases of coastal upwelling in 2009. During phase 1 intense upwelling was observed along the southern transects (8°N and 8.5°N). The maximum chlorophyll a concentration (22.7mgm −3) was observed in the coastal waters off Thiruvananthapuram (8.5°N). Further north there was no signature of upwelling, with extensive Trichodesmium erythraeum blooms. Diatoms dominated in these upwelling regions with the centric diatom Chaetoceros curvisetus being the dominant species along the 8°N transect. Along the 8.5°N transect pennate diatoms like Nitzschia seriata and Pseudo-nitzschia sp. dominated. During phase 2, upwelling of varying intensity was observed throughout the study area with maximum chlorophyll a concentrations along the 9°N transect (25mgm−3) with Chaetoceros curvisetus as the dominant phytoplankton. Along the 8.5°N transect pennate diatoms during phase 1 were replaced by centric diatoms like Chaetoceros sp. The presence of solitary pennate diatoms Amphora sp. and Navicula sp. were significant in the waters off Kochi. Upwelling was waning during phase 3 and was confined to the coastal waters of the southern transects with the highest chlorophyll a concentration of 11.2mgm−3. Along with diatoms, dinoflagellate cell densities increased in phases 2 and 3. In the northern transects (9°N and 10°N) the proportion of dinoflagellates was comparatively higher and was represented mainly by Protoperidinium spp., Ceratium spp. and Dinophysis spp

Adolescents' perceptions of parenting styles

This study investigated perceptions of parenting characteristics in a sample of Singaporean adolescents, and the influence of parenting characteristics on adolescent adjustments. In addition, it examined whether perceptions varied according to parent and adolescent gender.Master of Arts (Applied Psychology

Rapid synthesis of pure and narrowly distributed Eu doped ZnO nanoparticles by solution combustion method

International audiencePure ZnO Eu(3+) nanoparticles (similar to 50 nm) were prepared by a solution combustion method ZnO and Eu(2)O(3) were used as starting materials and dissolved in nitric acid Citric acid was used as a fuel The reaction mixture was heated at 350 C resulting into a rapid exothermic reaction yielding pure nanopowders The atomic weight concentration of Eu3+ doped in ZnO was 20% Transmission electron microscopy (TEM) was used to study the particle size and morphology The nanopowders were characterized for phase composition using X ray diffractrometry (XRD) Particle size distribution (PSD) analysis of ZnO Eu(3+) showed particlesizes ranging from 30 to 80 nm The photoluminescence emission spectra of ZnO Eu(3+) nanostructures showed a strong band emission around 618 nm when excited with 515 nm wavelength (C) 2010 Elsevier B V All rights reserve

Spatio-temporal variation of microphytoplankton in the upwelling system of the south-eastern Arabian Sea during the summer monsoon of 2009

The phytoplankton standing crop was assessed in detail along the South Eastern Arabian Sea (SEAS) during the different phases of coastal upwelling in 2009. During phase 1 intense upwelling was observed along the southern transects(8&deg;N and 8.5&deg;N). The maximum chlorophyll <i>a</i> concentration (22.7 mg m^-3) was observedin the coastal waters off Thiruvananthapuram (8.5&deg;N). Further north there was no signature of upwelling, with extensive <i> Trichodesmium erythraeum</i> blooms. Diatoms dominated in these upwelling regions with thecentric diatom <i> Chaetoceros curvisetus</i> being the dominant species along the 8&deg;N transect. Along the 8.5&deg;N transect pennate diatoms like <i> Nitzschia seriata</i> and <i>Pseudo-nitzschia</i> sp. dominated. Duringphase 2, upwelling of varying intensity was observed throughout the study area with maximum chlorophyll <i>a</i> concentrations along the 9&deg;N transect (25 mg m^-3) with <i> Chaetoceros curvisetus</i> as the dominantphytoplankton. Along the 8.5&deg;N transect pennate diatoms during phase 1 were replaced by centric diatoms like <i>Chaetoceros</i> sp. The presence of solitary pennate diatoms <i>Amphora</i> sp. and <i> Navicula</i> sp.were significant in the waters off Kochi. Upwelling was waning during phase 3 and was confined to the coastal waters of the southern transects with the highest chlorophyll <i>a</i> concentration of 11.2 mg m^-3. Along withdiatoms, dinoflagellate cell densities increased in phases 2 and 3. In the northern transects (9&deg;N and 10&deg;N) the proportion of dinoflagellates was comparatively higher and was represented mainly by <i>Protoperidinium</i> spp