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Contrasting bioaccumulation and transport behaviour of two artificial radionuclides (Am-241 and Cs-134) in cuttlefish eggshell ArchiMer
Bustamante, Paco; Teyssie, J; Fowler, S; Warnau, M.
Radionuclide experiments were performed to study the accumulation, retention and transport of Am-241 and Cs-134 in egos of the common cuttlefish Sepia officinalis. Experiments were designed to determine the processes controlling uptake of both radionuclides following, exposure via seawater. The bioaccumulation of both radionuclides displayed saturation kinetics with steady state in uptake being reached in 10 d for Am-241 and 6 d for (CS)-C-134. Am-241 was readily taken up by the eggs which reached a concentration factor (CF) of 20 after 10 d of exposure. During embryonic development. the eggshell acted as an effective shield against Am-241 penetration with 98% of the radionuclide associated with this membrane. In contrast. (CS)-C-134 was transported across...
Tipo: Text Palavras-chave: Cephalopods; Bioaccumulation; Biokinetics; Radionuclides.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1871.pdf
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Economics of organic farming (extension to OF0125)(0F0190) Organic Eprints
Fowler, S; Wynne-Jones, I; Lampkin, N.
This project OF0190 was an extension to OF0125 to cover completing the comparison data for 1997/98 and to extend the data collection by one further year (1998/99). The final reports for the two projects are therefore being submitted jointly. The OF0125 report covers the period 1995/96-1997/98, for which a detailed report was submitted to MAFF in July 1999, and a revised detailed report including a complete set of comparisons with conventional farms was submitted to MAFF, after revisions, in July 2000. That report has now been published at www.organic.aber.ac.uk/library/organic farm incomes.pdf. A detailed report for 1998/99 has been submitted to MAFF in March 2001, and will be published at the same internet site once accepted. The report presents...
Tipo: Report Palavras-chave: Policy environments and social economy; Farming Systems; Farm economics.
Ano: 2001 URL: http://orgprints.org/6606/1/OF0190_182_FRP.pdf
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Modelling Organic Dairy Production Systems Organic Eprints
Nicholas, P; Padel, S; Lampkin, N; Fowler, S; Topp, K; Weller, R.
In this study, a large number of organic dairy production strategies were compared in terms of physical and financial performance through the integrated use of computer simulation models and organic case study farm data. Production and financial data from three organic case study farms were used as a basis for the modelling process to ensure that the modelled systems were based on real sets of resources that might be available to a farmer. The case study farms were selected to represent a range of farming systems in terms of farm size, concentrate use and location. This paper describes the process used to model the farm systems: the integration of the three models used and the use of indicators to assess the modelled farm systems in terms of physical...
Tipo: Conference paper, poster, etc. Palavras-chave: Dairy cattle; Farm economics.
Ano: 2004 URL: http://orgprints.org/10999/1/modelling_organic_dairy_production_systems.pdf
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