Modeling dimethylsulphide production in the upper ocean

Dimethylsulphide (DMS) is produced by upper ocean ecosystems and emitted to the atmosphere, where it may have an important role in climate regulation. Several attempts to quantify the role of DMS in climate change have been undertaken in modeling studies. We examine a model of biogenic DMS production and describe its endogenous dynamics and sensitivities. We extend the model to develop a one-dimensional version that more accurately resolves the important processes of the mixed layer in determining the ecosystem dynamics. Comparisons of the results of the one-dimensional model with an empirical relationship that describes the global distribution of DMS, and also with vertical profiles of DMS in the upper ocean measured at the Bermuda Atlantic Time Series, suggest that the model represents the interaction between the biological and physical processes well on local and global scales. Our analysis of the model confirms its veracity and provides insights into the important processes determining DMS concentration in the oceans

Environmental determinism of year to year recruitment variability of European eel in a small coastal catchment, the Frémur river, north-west France

The influence of environmental factors (mainly the river flow) on the year-to-year variability of European eel Anguilla anguilla fluvial recruitment in a small coastal River (north-west France) was examined. A comprehensive survey of catches from fixed traps at two weirs located at 4·5 km (Pont es Omnes Dam) and 6·0 km (Bois Joli Dam) above the river mouth was carried out between 1997 and 2004. Young pigmented elvers (mean ± s.d. total length, 133·7 ± 29·6 mm) were recruited in eel-passes from February to October, but the main runs followed a modal curve from April to September with a peak centred in May to June. Catches varied greatly between years, from 381 to 26 765 elvers. For each trap, a positive linear relationship between monthly mean river flow that preceded the maximal intensity of captures and annual total catches was observed. These relationships explained 73·1% (P <0.01) and 89·0% (P <0.001) of the year-to-year variability of the recruitment observed in the Pont es Omnes and Bois Joli traps respectively. A significant increase in river flow at the beginning of the migration peak would thus trigger a greater proportion of A. anguilla settled in the estuary and in the downstream zone of the Fremur River to begin their freshwater colonization. The physicochemical roles of changes in river discharge in stimulating upstream migration are discussed. It is concluded that fluvial recruitment in the Fremur River is mainly determined by environmental factors

Ecological implications of a flower size/number trade-off in tropical forest trees

Peer reviewedPublisher PD

Value for Money in Social Care : The Role of Economic Evidence in the Guideline Development Process of the National Institute for Health and Care Excellence in England. Journal of Long-Term Care

In England, the National Institute for Health and Care Excellence (NICE) has been responsible for developing social care guidelines since 2012. Internationally, it is the first health technology assessment and guideline agency that specifically includes social care. As is the case for NICE’s clinical and public health guidance, social care guidelines comprise recommendations based on the best available evidence of effectiveness and cost-effectiveness. This paper provides an overview of how economic evidence is used within social care guideline development. Firstly, the paper describes the guideline development and quality assurance process, in addition to the roles and responsibilities of the technical team and guideline committee members. Secondly, the paper summarises how economic evidence is reviewed, generated, and used to inform recommendations, with examples given to highlight some of the challenges and opportunities that can be encountered. The paper culminates with proposals for the use of economic evidence in social care in England going forward and makes recommendations for further research in this area. The paper posits that guidelines are an important vehicle for supporting evidence-based practice in social care and that economic evidence is a critical kind of evidence to include. As economic evidence in social care becomes more widely available, it can be increasingly used to produce useful and accessible information for decision makers. Further research is needed to understand the impact of implementing economic evidence-based recommendations in social care practice

The linearity response of the Planck-LFI flight model receivers

In this paper we discuss the linearity response of the Planck-LFI receivers, with particular reference to signal compression measured on the 30 and 44 GHz channels. In the article we discuss the various sources of compression and present a model that accurately describes data measured during tests performed with individual radiomeric chains. After discussing test results we present the best parameter set representing the receiver response and discuss the impact of non linearity on in-flight calibration, which is shown to be negligible.Comment: this paper is part of the Prelaunch status LFI papers published on JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/jinst; This is an author-created, un-copyedited version of an article accepted for publication in JINST. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/1748-0221/4/12/T12011