Na-23, Si-29, and C-13 MAS NMR investigation of glass-forming reactions between Na2CO3 and SiO2

Winter, Rudolf; Jones, A.R.; Greaves, G.N.; Smith, I.H., (2005) 'Na-23, Si-29, and C-13 MAS NMR investigation of glass-forming reactions between Na2CO3 and SiO2', Journal of Physical Chemistry B 109(49) pp.23154-23161 RAE2008

Low energy C-13(+) and C-13(2+) ion irradiation of water ice

In this paper we report the results of the first experimental study of the irradiation of low temperature water ice (30 and 90 k) using low energy (4keV) C-13(+) and C-(2+) ions. (CO2)-C-13 and H2o2 were readily formed within the H2O ice with the product ion yield and grwoth rate observed to be highly dependent on both the sample temperature and the ion charge state.

delta C-13 and delta N-15 reveal significant differences in the coastal foodwebs of the seas surrounding Trinidad and Tobago

This study assessed nearshore, marine ecosystem function around Trinidad and Tobago (TT). The coastline of TT is highly complex, bordered by the Atlantic Ocean, the Caribbean Sea, the Gulf of Paria and the Columbus Channel, and subject to local terrestrial runoff and regional riverine inputs (e.g. the Orinoco and Amazon rivers). Coastal organisms can assimilate energy from allochthonous and autochthonous Sources, We assessed whether stable isotopes delta C-13 and delta N-15 Could be used to provide a rapid assessment of trophic interactions in primary consumers around the islands. Filter-feeding (bivalves and barnacles) and grazing organisms (gastropods and chitons) were collected from 40 marine sites during the wet season. The flesh of organisms was analysed for delta C-13 and delta N-15. Results indicate significant variation in primary consumers (by feeding guild and sampling zone). This variation was linked to different energy Sources being assimilated by consumers. Results suggest that offshore production is fuelling intertidal foodwebs; for example, a depleted delta C-13 signature in grazers from the Gulf of Paria, Columbus Channel and the Caribbean and Atlantic coastline of 9 Tobago indicates that carbon with an offshore origin (e.g. phytoplankton and dissolved organic matter) is more important than benthic or littoral algae (luring the wet season. Results also confirm findings from other studies indicating that much of the coastline is subject to Cultural eutrophication. This Study revealed that ecosystem function is spatially variable around the coastline of TT, This has clear implications for marine resource management, as a single management approach is unlikely to be successful at a national level.

13-6-20, Croix Catelan, prix Blanchet, finale du 110 m haies : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59673

13-6-20, Croix Catelan, prix Blanchet, arrivée du 100 m, Caste [vainqueur] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59674

13-6-20, Croix Catelan, prix Blanchet, départ 1500 m : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59675

13-6-20, Croix Catelan, prix Blanchet, Guillemot gagnant du 1500 m : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59676

13-6-20, Croix Catelan, prix Blanchet, Delvart gagne le 400 m : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59677

[Joseph] Guillemot, [13-6-20, Croix Catelan, prix Blanchet, portrait du vainqueur du] 1500 m : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59678

Caste, [13-6-20, Croix Catelan, prix Blanchet, portrait du vainqueur du] 100 m : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59679